[go: nahoru, domu]

US20140251856A1 - Coating composition, a method for coating a substrate, a coated substrate, a packaging material and a liquid package - Google Patents

Coating composition, a method for coating a substrate, a coated substrate, a packaging material and a liquid package Download PDF

Info

Publication number
US20140251856A1
US20140251856A1 US14/355,459 US201214355459A US2014251856A1 US 20140251856 A1 US20140251856 A1 US 20140251856A1 US 201214355459 A US201214355459 A US 201214355459A US 2014251856 A1 US2014251856 A1 US 2014251856A1
Authority
US
United States
Prior art keywords
coating composition
coating
substrate
surfactant
curtain
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US14/355,459
Inventor
Johan Larsson
Anders Karlsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BILLERUDKORSNAS SKOG & INDUSTRI AKTIEBOLAGE
Original Assignee
BILLERUDKORSNAS SKOG & INDUSTRI AKTIEBOLAGE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BILLERUDKORSNAS SKOG & INDUSTRI AKTIEBOLAGE filed Critical BILLERUDKORSNAS SKOG & INDUSTRI AKTIEBOLAGE
Publication of US20140251856A1 publication Critical patent/US20140251856A1/en
Assigned to BILLERUDKORSNAS SKOG & INDUSTRI AKTIEBOLAGE reassignment BILLERUDKORSNAS SKOG & INDUSTRI AKTIEBOLAGE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LARSSON, JOHAN, KARLSSON, ANDERS
Abandoned legal-status Critical Current

Links

Images

Classifications

    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D129/00Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
    • C09D129/02Homopolymers or copolymers of unsaturated alcohols
    • C09D129/04Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00Processes for applying liquids or other fluent materials
    • B05D1/30Processes for applying liquids or other fluent materials performed by gravity only, i.e. flow coating
    • B05D1/305Curtain coating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/06Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/10Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D25/00Details of other kinds or types of rigid or semi-rigid containers
    • B65D25/14Linings or internal coatings
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D3/00Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D31/00Bags or like containers made of paper and having structural provision for thickness of contents
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38Packaging materials of special type or form
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D85/00Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/70Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for
    • B65D85/72Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for for edible or potable liquids, semiliquids, or plastic or pasty materials
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D101/00Coating compositions based on cellulose, modified cellulose, or cellulose derivatives
    • C09D101/02Cellulose; Modified cellulose
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D103/00Coating compositions based on starch, amylose or amylopectin or on their derivatives or degradation products
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D103/00Coating compositions based on starch, amylose or amylopectin or on their derivatives or degradation products
    • C09D103/02Starch; Degradation products thereof, e.g. dextrin
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D105/00Coating compositions based on polysaccharides or on their derivatives, not provided for in groups C09D101/00 or C09D103/00
    • C09D105/14Hemicellulose; Derivatives thereof
    • C09D7/1233
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40Additives
    • C09D7/45Anti-settling agents
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40Additives
    • C09D7/60Additives non-macromolecular
    • C09D7/63Additives non-macromolecular organic
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03Non-macromolecular organic compounds
    • D21H17/05Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/06Alcohols; Phenols; Ethers; Aldehydes; Ketones; Acetals; Ketals
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20Macromolecular organic compounds
    • D21H17/33Synthetic macromolecular compounds
    • D21H17/34Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/36Polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00Coated paper; Coating material
    • D21H19/10Coatings without pigments
    • D21H19/12Coatings without pigments applied as a solution using water as the only solvent, e.g. in the presence of acid or alkaline compounds
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00Coated paper; Coating material
    • D21H19/10Coatings without pigments
    • D21H19/14Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/20Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00Coated paper; Coating material
    • D21H19/36Coatings with pigments
    • D21H19/44Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00Coated paper; Coating material
    • D21H19/36Coatings with pigments
    • D21H19/44Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/56Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/60Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22Addition to the formed paper
    • D21H23/46Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22Addition to the formed paper
    • D21H23/46Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • D21H23/48Curtain coaters
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00Specific properties of additives
    • C08K2201/008Additives improving gas barrier properties
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/34Silicon-containing compounds
    • C08K3/346Clay
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00Use of organic ingredients
    • C08K5/04Oxygen-containing compounds
    • C08K5/06Ethers; Acetals; Ketals; Ortho-esters
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00Use of ingredients characterised by shape
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00Polymer mixtures characterised by other features
    • C08L2205/03Polymer mixtures characterised by other features containing three or more polymers in a blend
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00Coated paper; Coating material
    • D21H19/36Coatings with pigments
    • D21H19/38Coatings with pigments characterised by the pigments
    • D21H19/40Coatings with pigments characterised by the pigments siliceous, e.g. clays
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/50Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
    • D21H21/52Additives of definite length or shape
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/13Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1303Paper containing [e.g., paperboard, cardboard, fiberboard, etc.]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/27Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.]
    • Y10T428/273Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.] of coating
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/27Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.]
    • Y10T428/273Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.] of coating
    • Y10T428/277Cellulosic substrate
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/31504Composite [nonstructural laminate]
    • Y10T428/31855Of addition polymer from unsaturated monomers
    • Y10T428/3188Next to cellulosic
    • Y10T428/31895Paper or wood
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/31504Composite [nonstructural laminate]
    • Y10T428/31855Of addition polymer from unsaturated monomers
    • Y10T428/3188Next to cellulosic
    • Y10T428/31895Paper or wood
    • Y10T428/31899Addition polymer of hydrocarbon[s] only
    • Y10T428/31902Monoethylenically unsaturated
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/31504Composite [nonstructural laminate]
    • Y10T428/31971Of carbohydrate
    • Y10T428/31975Of cellulosic next to another carbohydrate

Definitions

  • the present invention relates to a coating composition comprising a polymer and a surfactant, wherein the polymer is selected from a group consisting of polyvinyl alcohol and polysaccharides, or mixtures thereof.
  • a gas barrier coating composition suitable for curtain coating.
  • the present invention also relates to a method for providing a substrate with a gas barrier layer by means of the coating composition, a coated substrate, a packaging material comprising a coated paperboard, and a liquid package comprising such a packaging material.
  • curtain coating is a coating process in which a linear flow of a liquid coating composition is deposited on a surface of a moving substrate, such as paper web.
  • the coating composition forms a liquid sheet that falls freely before impinging onto the moving substrate that is to be coated.
  • curtain coating is a technique well suited for coating a paper web with a liquid barrier layer, since the barrier substance must form a film that covers the surface entirely, or as close to entirely as possible.
  • the curtain coating process is susceptible to certain defects, such as irregular heel formation, air entrainment and curtain instabilities that may result in a coated surface that displays smaller or bigger areas that lacks coating.
  • a test may be made by applying a coloured test liquid onto the coated surface. Any defects will then appear as coloured areas or so called pinholes.
  • the coating does not contain any defects or at least very few defects, for example in the food industry and for liquid packages (i.e. packages containing liquids).
  • a coating comprising polysaccharides and/or polyvinyl alcohol deposited on a substrate is known to be suitable as a barrier against oxygen, odours, aromas, etc. in for example packaging material based on paperboard substrate.
  • a suitable dynamic surface tension calculated from Mach-angle measurements in the falling curtain, is required in order for the free falling curtain of coating liquid to form a stable curtain and not to have defects in the form of holes.
  • the coating liquid should have a dynamic surface tension of less than 40 mNm to satisfy the criteria of a falling curtain without the formation of holes.
  • polysaccharides and polyvinyl alcohol which are non-Newtonian fluids does have a considerably higher surface tension which leads to an instable curtain at low flow rates.
  • An object of the present invention is to provide an improved coating composition suitable for curtain coating, in particular for the above mentioned fields of application.
  • Another object is to obtain a coating that will result in a final product that is suitable for the food industry, that is free of any toxic or unhealthy substances, and which is safe to use. Moreover, when used in a packing material, it must not contain any substances that can migrate into the food product or emit any smells or aromas when used in food or liquid packages.
  • a curtain coatable gas barrier coating composition comprising a polymer and a surfactant, wherein the polymer is selected from a group consisting of polyvinyl alcohol and polysaccharides, or mixtures thereof, wherein said polysaccharides are soluble or dispersable or suspendable in water and the surfactant is a water soluble non-ionic ethoxylated alcohol.
  • This coating composition makes it possible to obtain a stable curtain with a low number of pinholes in the coating of a coated substrate, such as a fibre substrate, e.g. a paperboard.
  • This coating provides good barrier qualities against gases, e.g. oxygen, aromas and odours.
  • the polysaccharides may comprise starch, starch derivatives, MFC (micro fibrillar cellulose) and hemicellulose.
  • the polymer comprises polyvinyl alcohol alone or in a mixture with starch and/or a starch derivative and/or MFC and/or hemicellulose.
  • the polymer comprises starch alone, or a starch derivative alone, or a mixture thereof, or either one in mixture with MFC and/or hemicellulose.
  • the polymer comprises MFC alone or hemicellulose alone, or a mixture thereof.
  • the surfactant may be a saturated iso-C13 alcohol.
  • the surfactant has the formula RO(CH 2 CH 2 O) x H, wherein R ⁇ iso-C 13 H27 and x is 8 or higher
  • the surfactant may be an alkyl polyethylene glycol ether based on C10-Guerbet alcohol, with a degree of ethoxylation of 7 or higher.
  • the surfactant may be a saturated short-chain fatty alcohol.
  • the surfactant has the formula RO(CH 2 CH 2 O) x H, wherein R ⁇ a saturated short-chain alcohol and x is 5 or higher.
  • the coating composition may comprise a concentration of 0.05-2.0 weight % of non-ionic ethoxylated alcohol surfactant, preferably 0.1-1.0%, and more preferably 0.2-0.5 weight %, of the total weight of the bone dry coating composition.
  • the solid content of the composition may be 4-20%; preferably 7-15%, or 6-12%, or even 8-10%.
  • the balance is water.
  • the coating composition may comprise platy particles, for example it may comprise Montmorillonite clay in nano particle form. This has the advantage of improving the gas barrier function.
  • the clay or other suitable platy or nano form additives may be added to the polyvinyl alcohol in an amount of 1-20% dry weight of the total dry weight of the composition, preferably 3-15% and more preferably 5-10%.
  • the coating composition may preferably comprise a weight percentage of approximately 80-99.5% of dry matter in the composition constituted by a polymer chosen as the main component, and the amount of additives to the main component, such as other polymers or platy particles and surfactant, have a weight percentage of approximately 0.05-20% of dry matter in the composition.
  • the weight percentage of the polymer chosen as the main component is 85-98%, and the weight percentage of the additives is 2-15%.
  • the weight percentage of the additives is 2-15%.
  • a second aspect of the invention is defined a method for providing a substrate with a gas barrier layer in at least one coating step, comprising application of a coating composition as defined in any one of the claims defining the coating composition, by curtain coating the substrate with the coating composition in at least one coating step.
  • the method may comprise only one coating step of applying a coating layer of the described composition of polyvinyl alcohol alone, or of any of the mentioned polysaccharides (starch, starch derivative, MFC, hemicelluloses) alone, or of mixtures thereof wherein polyvinyl alcohol is the main component or starch or starch derivative or MFC or hemicellulose is the main component. Any combination is foreseeable.
  • the method may further comprise a second step of applying a second coating layer with a composition chosen from all the above mentioned possibilities. Usually there will be a drying step after each coating step.
  • the coating composition chosen for the first and second layer may be the same coating composition or different coating compositions.
  • the method may comprise curtain coating the substrate in a first step with a coating composition containing polyvinyl alcohol and in a second step with a coating composition containing polyvinyl alcohol.
  • the method may comprise curtain coating the substrate in a first step with a coating composition comprising a polysaccharide and in a second step with a coating composition comprising a polysaccharide.
  • the method may comprise curtain coating the substrate in a first step with a coating composition containing a polysaccharide and in a second step with a coating composition comprising polyvinyl alcohol.
  • the method may comprise curtain coating the substrate in a first step with a coating composition containing polyvinyl alcohol and in a second step with a coating composition comprising a polysaccharide.
  • the method may comprise curtain coating the substrate in a first step with a coating composition comprising polyvinyl alcohol, MFC, clay in nano particle form and a water soluble non-ionic ethoxylated alcohol, and curtain coating the substrate in a second step with a coating composition comprising starch or a starch derivative and a water soluble non-ionic ethoxylated alcohol.
  • a coating composition comprising polyvinyl alcohol, MFC, clay in nano particle form and a water soluble non-ionic ethoxylated alcohol
  • curtain coating the substrate in a second step with a coating composition comprising starch or a starch derivative and a water soluble non-ionic ethoxylated alcohol.
  • the method may comprise curtain coating the substrate in a first step with a coating composition comprising polyvinyl alcohol, hemicellulose, clay in nano particle form and a water soluble non-ionic ethoxylated alcohol, and curtain coating the substrate in a second step with a coating composition comprising starch or a starch derivative and a water soluble non-ionic ethoxylated alcohol or vice versa.
  • Additional coating steps are of course also foreseeable, and any combination of layers of the same or different coating compositions, from the whole range of possible coating compositions, is possible.
  • An example of an additional coating step is a pigment coating step, which may very well be made before coating with the gas barrier coating composition.
  • the coat weight of the at least one coating layer may be 0.4 g/m 2 or more and less than 7.0 g/m 2 .
  • the coat weight of the barrier layer may be 0.8 g/m 2 or more and less than 7.0 g/m 2 , and preferably 1.2-4.0 g/m 2 , and even more preferably 1.6-3.2 g/m 2 .
  • the substrate may be a fibre substrate or a paper or a paperboard.
  • the substrate may be a fibre substrate or a paper or a paperboard.
  • a coated substrate having at least one gas barrier layer obtained by coating a substrate with a coating composition as defined in any one of claims defining the coating composition.
  • the gas barrier layer may be a barrier against oxygen in particular, and gases including odours and/or aromas.
  • the coated substrate may have a gas barrier layer that has a coat weight of 0.8 or more and less than 7.0 g/m 2 and preferably 1.2-4.0 g/m 2 , and even more preferably 1.6-3.2 g/m 2 .
  • the coated substrate may be a paperboard comprising at least one fibre based layer coated with the coating composition.
  • the substrate may be a paper or any other substrate requiring the concerned type of barrier.
  • a packaging material comprising a coated paperboard as defined above, further comprising a layer of low density polyethylene on each side of the coated paperboard, and having an OTR value of less than 40 ml/m 2 ⁇ 24 h ⁇ 1 atm, or preferably even less than 10 ml/m 2 ⁇ 24 h ⁇ 1 atm.
  • OTR stand for oxygen transmission rate and the instrument used for the measurement is Mocon Ox Tran 2/21.
  • a liquid package made from a packaging material as defined above.
  • the coating liquid should have a dynamic surface tension of less than 40 mNm to satisfy the criteria of a falling curtain without the formation of holes.
  • polysaccharides and polyvinyl alcohol which are non-Newtonian fluids, do not necessary need as low surface tension as Newtonian fluids due to their elasticity. There is then a need to obtain a good relationship between the flow rate and the surface tension and the non-newtonian fluid characteristics.
  • Some common concepts of curtain stability are the minimum flow which can be reached without rupture of the liquid curtain and the minimum flow at which the curtain heals itself to a completely defect free liquid curtain.
  • the surface tension for polysaccharides and polyvinyl alcohol may have dynamic surface tension values of up to 50 mNm, and still have a defect free operation even at very low flow rates such as lower than 4.0 litres/minute*meter.
  • FIGS. 1 a - 1 d shows schematically examples of a coated substrate according to the present invention
  • FIGS. 2 a - 2 d shows schematically examples of a packaging material according to the present invention.
  • This group of surfactants was non-ionic ethoxylated alcohols, such as sold under the trade names of Lutensol ON and Lutensol TO, by BASF.
  • Lutensol ON50, Lutensol ON70 and Lutensol TO8 were found to provide the required results.
  • the Lutensol ON types are non-ionic surfactants. They are alkyl polyethylene glycol ethers made from a saturated synthetic, short-chain fatty alcohol. They conform to the following formula: RO(CH2CH2O)xH, where
  • R saturated, synthetic, short-chain fatty alcohol
  • the numeric code in the product name usually indicates the degree of ethoxylation.
  • the Lutensol ON types are manufactured by causing the fatty alcohol to react with ethylene oxide in stoichiometric proportions.
  • the ethoxylation temperature is kept as low as possible. This, combined with the high purity of the feedstocks, ensures that high-performance products with low toxicity are obtained.
  • R may be iso-C10.
  • the Lutensol TO types are non-ionic surfactants. They are made from a saturated iso-C13 alcohol. They conform to the following structural formula: RO(CH2CH2O)xH, where
  • the numeric code in the product name indicates the degree of ethoxylation.
  • the Lutensol TO types are manufactured by causing the iso-C13 oxo alcohol to react with ethylene oxide in stoichiometric proportions.
  • the ethoxylation temperature is kept as low as possible. This, combined with the high purity of the feedstocks, ensures that high-performance products with low toxicity are obtained.
  • Lutensol ON50 the degree of ethoxylation
  • x the degree of ethoxylation
  • Lutensol ON70 x is 7.
  • a Lutensol ON having a lower molecular weight, Lutensol ON30 (x 3), was also tested but did not result in the desired effects.
  • the non-ionic ethoxylated alcohols having the desired effect are water soluble and provide relatively slow wetting.
  • Lutensol ON30 and TO6, on the other hand, are not water soluble.
  • Lutensol ON is water soluble for a degree of ethoxylation of 5 and above, while Lutensol TO is water soluble for a degree of ethoxylation of 8 and above.
  • Lutensol XP Another such water soluble non-ionic ethoxylated alcohol is Lutensol XP.
  • the Lutensol XP types are branched non-ionic surfactants. They are alkyl polyethylene glycol ethers based on C 10 -Guerbet alcohol and ethylene oxide.
  • the Lutensol® XP types are manufactured by reacting the C 10 -alcohol with ethylene oxide in stoichiometric proportions.
  • the numeric portion of the product name indicates the general degree of ethoxylation.
  • the product is water soluble when the degree of ethoxylation is 7 or higher.
  • the tests were made by depositing the liquid coating composition on a fibre based moving web in a curtain coating process.
  • the web was paperboard.
  • Test results are listed in Table 1.
  • the results in the table are measured on paperboard coated in a curtain coating process with two layers of the coating composition according to the invention, each layer being equal or not in coat weight to the other layer, totalling 2.0-5.0 g/m 2 .
  • OTR is short for Oxygen Transmission Rate, measured at 23° C. and 50% RH by the instrument Mocon Ox Tran 2/21.
  • a low KIT number indicates resistance only against fat; a high KIT number indicates high resistance against fat and solvents.
  • a low AO2IR value indicates high resistance against gas transmission.
  • the OTR is measured on a packaging material comprising the inventive coated paperboard provided with a polyethylene layer of 30 g/m2.
  • a low OTR value indicates good barrier function.
  • the coating composition may also comprise Montmorillonite clay, as mentioned before, or talc, kaolin clay or other similar solid additives in platy form or nano-particle form, while maintaining good barrier results, which has also been proven in tests.
  • Montmorillonite Cloisite
  • the tests performed with Montmorillonite are also shown in Table 1.
  • the clay or other suitable platy or nano form additives may be added to the polyvinyl alcohol in an amount of 1-20% dry weight of the total dry weight of the composition, preferably 3-15% and more preferably 5-10%.
  • Particularly good barrier results are the results showing a value of the oxygen transmission rate (OTR) of less than 40 ml/m2*24 h*1 atm, or even less than 10 ml/m2*24 h*1 atm.
  • OTR oxygen transmission rate
  • the same tests were also made in which polyvinyl alcohol was exchanged for starch.
  • the liquid coating composition comprising starch and surfactant showed good test results with an OTR of less than 40 ml/m2*24 h*1 atm, as can be seen in the table.
  • the present invention is not limited to the surfactant products with the above trade names, but there may be similar/corresponding products sold under other trade names by other suppliers or manufacturers which will work accordingly. It should also be mentioned that a possibility is foreseen to mix two or more surfactants, and it can also be foreseen that other components may be added to the coating composition, without departing from the scope of the present invention.
  • the polyvinyl alcohols used for the tests were supplied from Kuraray Nordic Oy in the form of product range Mowiol 6/98, 15/99 and 28/99, and it was prepared by dissolving in hot water according to the supplier's instructions.
  • the starch used was a hydroxipropylated oxidized starch product Solcoat P150 supplied by Solam AB. The starch was prepared by dissolving in hot water according to the suppliers instructions.
  • the microfibrillar cellulose (MFC) was supplied by Innventia AB and was supplied as a fibre suspension ready to use.
  • the Montmorillonite clay was supplied by Southern Clay Products, USA in the form of the product Cloisite Na+.
  • the concerned liquid coating composition can generally be prepared by adding the used polymer or polymers (polyvinyl alcohol and/or polysaccharides) and also Montmorillonite (or talc or kaolin clay) when applicable, in powder form to cold water. If MFC or hemicellulose is used it is generally in pre-suspended form. Thereby a liquid is obtained in which the added substances are dissolved or suspended or dispersed in water. The liquid is then heated. After preparation, the liquid shall be allowed to cool down before the surfactant is added and then the resulting composition is ready to be used in the curtain coating process.
  • each of the substances may prepared by itself, e.g. be dissolved (or suspended or dispersed in cold water) before mixing the substances with each other, heating and then adding the surfactant in order to obtain the final composition.
  • FIGS. 1 a - 1 d is schematically illustrated examples of a coated substrate according to the present invention.
  • a coated substrate where the substrate 1 is a paperboard comprising at least one fibre based layer, and the paperboard is coated with a gas barrier coating layer 2 comprising a coating composition according to the present invention.
  • the coated substrate is further provided with a pigment coating layer 3 on the opposite side of the paperboard layer 1 , i.e. on that side of the paperboard layer 1 that is not coated with the barrier coating 2 .
  • FIG. 1 c the coated substrate of FIG.
  • FIG. 1 a is also provided with a pigment coating layer 3 , but in this example the pigment coating layer 3 is provided between the paperboard layer 1 and the barrier coating layer 2 . Consequently, the barrier coating 2 has been applied on top of the already applied pigment coating layer 3 .
  • FIG. 1 d the coated paperboard of FIG. 1 c has been provided with an additional pigment coating layer 3 , resulting in a paperboard layer 1 having a pigment coating layer 3 on both sides and a barrier coating layer 2 applied on one of the pigment coating layers 3 .
  • FIGS. 2 a - 2 d shows schematically examples of a packaging material according to the present invention.
  • FIGS. 2 a - 2 d illustrates a coated substrate corresponding to FIGS. 1 a - 1 d respectively, which has been provided with a polyethylene layer 4 on both sides.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)
  • Laminated Bodies (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)

Abstract

The present invention relates to a curtain coatable gas barrier coating composition comprising a polymer and a surfactant, wherein the polymer is selected from a group consisting of polyvinyl alcohol and polysaccharides, or mixtures thereof, wherein said polysaccharides are soluble or dispersable or suspendable in water and the surfactant is a water soluble non-ionic ethoxylated alcohol. The present invention also relates to a method for providing a substrate with a gas barrier layer by means of the coating composition, and a coated substrate having at least one gas barrier layer obtained by coating the substrate with the coating composition. Further, the invention relates to a packaging material comprising a coated paperboard coated with the coating composition, and a liquid package comprising such a packaging material.

Description

    TECHNICAL FIELD OF THE INVENTION
  • The present invention relates to a coating composition comprising a polymer and a surfactant, wherein the polymer is selected from a group consisting of polyvinyl alcohol and polysaccharides, or mixtures thereof. In particular it relates to a gas barrier coating composition suitable for curtain coating. The present invention also relates to a method for providing a substrate with a gas barrier layer by means of the coating composition, a coated substrate, a packaging material comprising a coated paperboard, and a liquid package comprising such a packaging material.
  • BACKGROUND OF THE INVENTION
  • Curtain coating is a coating process in which a linear flow of a liquid coating composition is deposited on a surface of a moving substrate, such as paper web. The coating composition forms a liquid sheet that falls freely before impinging onto the moving substrate that is to be coated.
  • Curtain coating is a technique well suited for coating a paper web with a liquid barrier layer, since the barrier substance must form a film that covers the surface entirely, or as close to entirely as possible. However, the curtain coating process is susceptible to certain defects, such as irregular heel formation, air entrainment and curtain instabilities that may result in a coated surface that displays smaller or bigger areas that lacks coating. In order to discover such defects in the coverage of the coating, which can be very small due to e.g. air bubbles in the liquid coating, a test may be made by applying a coloured test liquid onto the coated surface. Any defects will then appear as coloured areas or so called pinholes. For some applications it is particularly important that the coating does not contain any defects or at least very few defects, for example in the food industry and for liquid packages (i.e. packages containing liquids).
  • It is previously known that polysaccharides and polyvinyl alcohol are good barriers against gases. A coating comprising polysaccharides and/or polyvinyl alcohol deposited on a substrate is known to be suitable as a barrier against oxygen, odours, aromas, etc. in for example packaging material based on paperboard substrate.
  • In curtain coating a suitable dynamic surface tension, calculated from Mach-angle measurements in the falling curtain, is required in order for the free falling curtain of coating liquid to form a stable curtain and not to have defects in the form of holes. Typically, for Newtonian fluids, the coating liquid should have a dynamic surface tension of less than 40 mNm to satisfy the criteria of a falling curtain without the formation of holes. However, polysaccharides and polyvinyl alcohol, which are non-Newtonian fluids does have a considerably higher surface tension which leads to an instable curtain at low flow rates.
  • In order to reduce the surface tension of polyvinyl alcohol it has been proposed to add a surface active substance, a surfactant, to the polyvinyl alcohol, for example as described in EP 2182113, using a surfactant of the type Air Products EnviroGem AE03. However, it has been found that even though the stability of the curtain improved when using a surfactant, the barrier effect of the coating deteriorated, and to such a degree that it was not usable for producing liquid packages. As other examples, it has been proposed to add relatively large amounts of ethanol or similar alcohol to the polyvinyl alcohol, but this is however not a satisfying solution of the coating problem in the paper industry since it requires handling and recycling of resulting volatile organic compounds (VOC).
  • To summarise, in order to use curtain coating to obtain a barrier on a substrate, such as a polyvinyl alcohol or polysaccharide barrier on a fibre substrate, e.g. paperboard, it is necessary to use added substances that reduces the dynamic surface tension in order to have a stable process, but these substances will at the same time have a negative effect on the film formation and therefore the barrier will be defective.
  • SUMMARY OF THE INVENTION
  • An object of the present invention is to provide an improved coating composition suitable for curtain coating, in particular for the above mentioned fields of application.
  • Another object is to obtain a coating that will result in a final product that is suitable for the food industry, that is free of any toxic or unhealthy substances, and which is safe to use. Moreover, when used in a packing material, it must not contain any substances that can migrate into the food product or emit any smells or aromas when used in food or liquid packages.
  • The objects are achieved by the present invention.
  • According to a first aspect of the present invention is defined a curtain coatable gas barrier coating composition comprising a polymer and a surfactant, wherein the polymer is selected from a group consisting of polyvinyl alcohol and polysaccharides, or mixtures thereof, wherein said polysaccharides are soluble or dispersable or suspendable in water and the surfactant is a water soluble non-ionic ethoxylated alcohol. This coating composition makes it possible to obtain a stable curtain with a low number of pinholes in the coating of a coated substrate, such as a fibre substrate, e.g. a paperboard. This coating provides good barrier qualities against gases, e.g. oxygen, aromas and odours.
  • Preferably, the polysaccharides may comprise starch, starch derivatives, MFC (micro fibrillar cellulose) and hemicellulose.
  • According to one embodiment of the present invention, the polymer comprises polyvinyl alcohol alone or in a mixture with starch and/or a starch derivative and/or MFC and/or hemicellulose.
  • According to another embodiment, the polymer comprises starch alone, or a starch derivative alone, or a mixture thereof, or either one in mixture with MFC and/or hemicellulose.
  • According to yet another embodiment, the polymer comprises MFC alone or hemicellulose alone, or a mixture thereof.
  • According to a further embodiment of the present invention, the surfactant may be a saturated iso-C13 alcohol. According to a further feature of this embodiment, the surfactant has the formula RO(CH2CH2O)xH, wherein R═iso-C13H27 and x is 8 or higher
  • According to another embodiment of the present invention, the surfactant may be an alkyl polyethylene glycol ether based on C10-Guerbet alcohol, with a degree of ethoxylation of 7 or higher.
  • According to yet another embodiment of the present invention, the surfactant may be a saturated short-chain fatty alcohol. According to a further feature of this embodiment, the surfactant has the formula RO(CH2CH2O)xH, wherein R═a saturated short-chain alcohol and x is 5 or higher.
  • The coating composition may comprise a concentration of 0.05-2.0 weight % of non-ionic ethoxylated alcohol surfactant, preferably 0.1-1.0%, and more preferably 0.2-0.5 weight %, of the total weight of the bone dry coating composition.
  • The solid content of the composition may be 4-20%; preferably 7-15%, or 6-12%, or even 8-10%. The balance is water.
  • Further, the coating composition may comprise platy particles, for example it may comprise Montmorillonite clay in nano particle form. This has the advantage of improving the gas barrier function. The clay or other suitable platy or nano form additives may be added to the polyvinyl alcohol in an amount of 1-20% dry weight of the total dry weight of the composition, preferably 3-15% and more preferably 5-10%.
  • The coating composition may preferably comprise a weight percentage of approximately 80-99.5% of dry matter in the composition constituted by a polymer chosen as the main component, and the amount of additives to the main component, such as other polymers or platy particles and surfactant, have a weight percentage of approximately 0.05-20% of dry matter in the composition.
  • Preferably, the weight percentage of the polymer chosen as the main component is 85-98%, and the weight percentage of the additives is 2-15%. However, it should be emphasized that any combination of the mentioned substances, and in any weight proportions, is conceivable within the frame of the invention.
  • According to a second aspect of the invention is defined a method for providing a substrate with a gas barrier layer in at least one coating step, comprising application of a coating composition as defined in any one of the claims defining the coating composition, by curtain coating the substrate with the coating composition in at least one coating step.
  • Accordingly, the method may comprise only one coating step of applying a coating layer of the described composition of polyvinyl alcohol alone, or of any of the mentioned polysaccharides (starch, starch derivative, MFC, hemicelluloses) alone, or of mixtures thereof wherein polyvinyl alcohol is the main component or starch or starch derivative or MFC or hemicellulose is the main component. Any combination is foreseeable.
  • The method may further comprise a second step of applying a second coating layer with a composition chosen from all the above mentioned possibilities. Usually there will be a drying step after each coating step. The coating composition chosen for the first and second layer may be the same coating composition or different coating compositions.
  • Accordingly, the method may comprise curtain coating the substrate in a first step with a coating composition containing polyvinyl alcohol and in a second step with a coating composition containing polyvinyl alcohol.
  • Alternatively, the method may comprise curtain coating the substrate in a first step with a coating composition comprising a polysaccharide and in a second step with a coating composition comprising a polysaccharide.
  • In another alternative, the method may comprise curtain coating the substrate in a first step with a coating composition containing a polysaccharide and in a second step with a coating composition comprising polyvinyl alcohol.
  • In yet another alternative, the method may comprise curtain coating the substrate in a first step with a coating composition containing polyvinyl alcohol and in a second step with a coating composition comprising a polysaccharide.
  • In still a further alternative, the method may comprise curtain coating the substrate in a first step with a coating composition comprising polyvinyl alcohol, MFC, clay in nano particle form and a water soluble non-ionic ethoxylated alcohol, and curtain coating the substrate in a second step with a coating composition comprising starch or a starch derivative and a water soluble non-ionic ethoxylated alcohol. The opposite order of the coatings is also possible.
  • In another alternative, the method may comprise curtain coating the substrate in a first step with a coating composition comprising polyvinyl alcohol, hemicellulose, clay in nano particle form and a water soluble non-ionic ethoxylated alcohol, and curtain coating the substrate in a second step with a coating composition comprising starch or a starch derivative and a water soluble non-ionic ethoxylated alcohol or vice versa.
  • Additional coating steps are of course also foreseeable, and any combination of layers of the same or different coating compositions, from the whole range of possible coating compositions, is possible. An example of an additional coating step is a pigment coating step, which may very well be made before coating with the gas barrier coating composition.
  • Further, the coat weight of the at least one coating layer may be 0.4 g/m2 or more and less than 7.0 g/m2. The coat weight of the barrier layer may be 0.8 g/m2 or more and less than 7.0 g/m2, and preferably 1.2-4.0 g/m2, and even more preferably 1.6-3.2 g/m2.
  • According to one feature, the substrate may be a fibre substrate or a paper or a paperboard. However, it is conceivable to implement the invention on other substrates, without going beyond the scope of the invention.
  • According to a third aspect of the present invention is defined a coated substrate having at least one gas barrier layer obtained by coating a substrate with a coating composition as defined in any one of claims defining the coating composition.
  • The gas barrier layer may be a barrier against oxygen in particular, and gases including odours and/or aromas.
  • Further, the coated substrate may have a gas barrier layer that has a coat weight of 0.8 or more and less than 7.0 g/m2 and preferably 1.2-4.0 g/m2, and even more preferably 1.6-3.2 g/m2.
  • In one embodiment, the coated substrate may be a paperboard comprising at least one fibre based layer coated with the coating composition. Alternatively, the substrate may be a paper or any other substrate requiring the concerned type of barrier.
  • According to a fourth aspect of the present invention, is defined a packaging material comprising a coated paperboard as defined above, further comprising a layer of low density polyethylene on each side of the coated paperboard, and having an OTR value of less than 40 ml/m2·24 h·1 atm, or preferably even less than 10 ml/m2·24 h·1 atm. OTR stand for oxygen transmission rate and the instrument used for the measurement is Mocon Ox Tran 2/21.
  • According to a fifth aspect of the present invention is defined a liquid package made from a packaging material as defined above.
  • As mentioned before, typically, for Newtonian fluids, the coating liquid should have a dynamic surface tension of less than 40 mNm to satisfy the criteria of a falling curtain without the formation of holes. However, according to the present invention it has been advantageously found that polysaccharides and polyvinyl alcohol, which are non-Newtonian fluids, do not necessary need as low surface tension as Newtonian fluids due to their elasticity. There is then a need to obtain a good relationship between the flow rate and the surface tension and the non-newtonian fluid characteristics. Some common concepts of curtain stability are the minimum flow which can be reached without rupture of the liquid curtain and the minimum flow at which the curtain heals itself to a completely defect free liquid curtain. In accordance with the present invention, it has surprisingly been found that the surface tension for polysaccharides and polyvinyl alcohol may have dynamic surface tension values of up to 50 mNm, and still have a defect free operation even at very low flow rates such as lower than 4.0 litres/minute*meter.
  • Further features and advantages will become apparent from the following detailed description of the invention and test examples.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • The invention will now be described in more detail, with reference being made to test examples and the enclosed schematic drawings illustrating different aspects and embodiments of the invention, given as examples only, and in which:
  • FIGS. 1 a-1 d shows schematically examples of a coated substrate according to the present invention, and
  • FIGS. 2 a-2 d shows schematically examples of a packaging material according to the present invention.
  • DETAILED DESCRIPTION OF THE INVENTION
  • During the search for a suitable surfactant and a suitable method, many different commercially available surfactants were tested that were alleged to be suitable for curtain coating. However, they were all found unsuitable since they all failed either in providing a stable curtain or in providing a sufficiently good barrier.
  • After having performed many tests it was surprisingly found a group of surfactants that managed to provide the desired result of a stable curtain and a high quality barrier with an acceptable low amount of pinholes. This group of surfactants was non-ionic ethoxylated alcohols, such as sold under the trade names of Lutensol ON and Lutensol TO, by BASF. In particular Lutensol ON50, Lutensol ON70 and Lutensol TO8 were found to provide the required results.
  • According to the product information supplied by BASF, the Lutensol ON types are non-ionic surfactants. They are alkyl polyethylene glycol ethers made from a saturated synthetic, short-chain fatty alcohol. They conform to the following formula: RO(CH2CH2O)xH, where
  • R=saturated, synthetic, short-chain fatty alcohol
  • x=3, 5, 6, 7, 8 or 11
  • The numeric code in the product name usually indicates the degree of ethoxylation. The Lutensol ON types are manufactured by causing the fatty alcohol to react with ethylene oxide in stoichiometric proportions. The ethoxylation temperature is kept as low as possible. This, combined with the high purity of the feedstocks, ensures that high-performance products with low toxicity are obtained. According to additional information available from BASF, R may be iso-C10.
  • According to the product information supplied by BASF, the Lutensol TO types are non-ionic surfactants. They are made from a saturated iso-C13 alcohol. They conform to the following structural formula: RO(CH2CH2O)xH, where
  • R=iso-C13 H27
  • x=3, 5, 6, 6.5, 7, 8, 10, 12, 15 or 20
  • The numeric code in the product name indicates the degree of ethoxylation. The Lutensol TO types are manufactured by causing the iso-C13 oxo alcohol to react with ethylene oxide in stoichiometric proportions. The ethoxylation temperature is kept as low as possible. This, combined with the high purity of the feedstocks, ensures that high-performance products with low toxicity are obtained.
  • In the case of Lutensol ON50, x (the degree of ethoxylation) is 5, and in the case of Lutensol ON70, x is 7. A Lutensol ON having a lower molecular weight, Lutensol ON30 (x=3), was also tested but did not result in the desired effects.
  • In the case of Lutensol TO8, x is 8. Lutensol TO8 has a molecular weight of approximately 600 g/mol. Also for this group, a Lutensol TO having a lower molecular weight, Lutensol TO6 (x=6), was also tested but did not result in the desired effects.
  • The non-ionic ethoxylated alcohols having the desired effect are water soluble and provide relatively slow wetting. Lutensol ON30 and TO6, on the other hand, are not water soluble. Lutensol ON is water soluble for a degree of ethoxylation of 5 and above, while Lutensol TO is water soluble for a degree of ethoxylation of 8 and above.
  • Another such water soluble non-ionic ethoxylated alcohol is Lutensol XP. According to the product information supplied by BASF, the Lutensol XP types are branched non-ionic surfactants. They are alkyl polyethylene glycol ethers based on C10-Guerbet alcohol and ethylene oxide. The Lutensol® XP types are manufactured by reacting the C10-alcohol with ethylene oxide in stoichiometric proportions. The numeric portion of the product name indicates the general degree of ethoxylation. The product is water soluble when the degree of ethoxylation is 7 or higher.
  • Tests with good and satisfying results were performed with a liquid coating composition comprising polyvinyl alcohol, of which a solution was prepared according to the instructions on the particular product, and to which solution the concerned surfactant was added according to the following:
    • Concentration of surfactant (weight % of added surfactant as from package of the weight of the total bone dry composition): 0.05-2%; preferably 0.1-1.0% or even 0.2-0.5%; Solid content of the composition: 4-20%; preferably 7-15%, or even 8-10%.
  • The tests were made by depositing the liquid coating composition on a fibre based moving web in a curtain coating process. The web was paperboard.
  • Test results are listed in Table 1. The results in the table are measured on paperboard coated in a curtain coating process with two layers of the coating composition according to the invention, each layer being equal or not in coat weight to the other layer, totalling 2.0-5.0 g/m2. In this table are also shown comparative tests performed with a coating comprising polyvinyl alcohol (PvOH) alone and a coating composition comprising polyvinyl alcohol and the by Cytec, USA, commercially available surfactant Aerosol OT75 comprising “Sodium dioctyl sulfosuccinate”, which did not result in a satisfying gas barrier.
  • TABLE 1
    Test examples
    Coat AO2IR OTR
    weight Visual Curtain KIT- Pinholes/ ml/dm2* ml/m2*24
    Coating composition g/m2 observation stability number dm2 24 h h*1atm
    PvOH 3.2 OK at high Holes in 1 237 1817 5.8
    flow rate the film
    only
    PvOH + 0.2% Aerosol OT75 2.4 OK OK 1 252 5152 61.8 
    PvOH + 0.5% Lutensol 3.2 OK OK 3 108 556 4.9
    ON50
    PvOH + 10% Cloisite + 0.5% 3.2 OK OK 3 99 397 2.6
    Lutensol ON50
    PvOH + 0.3% Lutensol 3.0 OK OK 4 51 7  
    ON70
    PvOH + 10% Cloisite + 0.3% 2.0 OK OK 12 4 94 5.2
    Lutensol ON70
    PvOH + 10% Cloisite + 0.3% 3.0 OK OK 12 3 13 2.9
    Lutensol ON70
    PvOH + 10% Cloisite + 5% 3.2 OK OK 5 84 511 6.2
    MFC + 0.3% Lutensol ON70
    First layer 3.2 OK OK 7 39 552 8.1
    (PvOH + 10% Cloisite + 5% (1.6 + 1.6)
    MFC + 0.3% Lutensol ON70) +
    Second layer
    (Starch + 0.2% Lutensol
    ON70)
    Starch + 0.2% Lutensol 5.0 OK OK 5 327 881 31.0 
    ON70
    KIT = TAPPI T 559 KIT test (repellency of paper and board to grease, oil, and waxes) AO2IR is short for Ambient Oxygen Ingress Rate which is a method for measuring oxygen gas transmission with a Perm-Mate instrument supplied by PBI Dansensor or Systech Illinois.
    OTR is short for Oxygen Transmission Rate, measured at 23° C. and 50% RH by the instrument Mocon Ox Tran 2/21.
    A low KIT number indicates resistance only against fat; a high KIT number indicates high resistance against fat and solvents.
    A low AO2IR value indicates high resistance against gas transmission.
    The OTR is measured on a packaging material comprising the inventive coated paperboard provided with a polyethylene layer of 30 g/m2. A low OTR value indicates good barrier function.
  • The coating composition may also comprise Montmorillonite clay, as mentioned before, or talc, kaolin clay or other similar solid additives in platy form or nano-particle form, while maintaining good barrier results, which has also been proven in tests. The tests performed with Montmorillonite (Cloisite) are also shown in Table 1. The clay or other suitable platy or nano form additives may be added to the polyvinyl alcohol in an amount of 1-20% dry weight of the total dry weight of the composition, preferably 3-15% and more preferably 5-10%.
  • Particularly good barrier results are the results showing a value of the oxygen transmission rate (OTR) of less than 40 ml/m2*24 h*1 atm, or even less than 10 ml/m2*24 h*1 atm. The same tests were also made in which polyvinyl alcohol was exchanged for starch. Also the liquid coating composition comprising starch and surfactant showed good test results with an OTR of less than 40 ml/m2*24 h*1 atm, as can be seen in the table.
  • In addition, the same tests were performed in which a coating had been obtained by having a first layer with a liquid composition comprising polyvinyl alcohol, Montmorillonite clay and MFC together with a surfactant, and a second layer with a liquid composition comprising starch and a surfactant. This coating also resulted in good and satisfying test results, as shown in table 1.
  • It can be foreseen that, based on the good test results with starch and MFC, also hemicelluloses, primarily Xylanes and Xyloglucanes, which are also known to be good barriers alone or in mixture, can be used in the same way as starch and MFC.
  • The tests were performed with a velocity of the web substrate between 420 and 850 m/min with good results. With a curtain flow rate of at least 6 l/min*m and stable curtain conditions, it can be shown that it is theoretically possible to have a velocity of 250-1500 m/min, or even more, with a coat weight of 0.4-4.0 g/m2 applied in two layers, totalling 0.8-8.0 g/m2, and achieve satisfactory barrier results.
  • It should be generally understood that the present invention is not limited to the surfactant products with the above trade names, but there may be similar/corresponding products sold under other trade names by other suppliers or manufacturers which will work accordingly. It should also be mentioned that a possibility is foreseen to mix two or more surfactants, and it can also be foreseen that other components may be added to the coating composition, without departing from the scope of the present invention.
  • The polyvinyl alcohols used for the tests were supplied from Kuraray Nordic Oy in the form of product range Mowiol 6/98, 15/99 and 28/99, and it was prepared by dissolving in hot water according to the supplier's instructions. The starch used was a hydroxipropylated oxidized starch product Solcoat P150 supplied by Solam AB. The starch was prepared by dissolving in hot water according to the suppliers instructions. The microfibrillar cellulose (MFC) was supplied by Innventia AB and was supplied as a fibre suspension ready to use. The Montmorillonite clay was supplied by Southern Clay Products, USA in the form of the product Cloisite Na+. Tests were also made with kaolin clay and talc, with similar good results as with Montmorillonite. The kaolin clay used was supplied by Imerys in the form of Product Barrisurf LX. The talc used was supplied by FinnTalc Oy in the form of the product Finntalc C10B. It should be clear that also other similar types of polyvinyl alcohols, and other brands of the mentioned substances may be used without departing from the scope of the present invention. It is concluded that the present invention makes it possible to obtain a barrier coated paperboard that is suitable for liquid packages, in which the polyvinyl alcohol/polysaccharide layer provides an oxygen barrier and other additional layers, e.g. polyethylene, provides a liquid barrier and sealing properties.
  • The concerned liquid coating composition can generally be prepared by adding the used polymer or polymers (polyvinyl alcohol and/or polysaccharides) and also Montmorillonite (or talc or kaolin clay) when applicable, in powder form to cold water. If MFC or hemicellulose is used it is generally in pre-suspended form. Thereby a liquid is obtained in which the added substances are dissolved or suspended or dispersed in water. The liquid is then heated. After preparation, the liquid shall be allowed to cool down before the surfactant is added and then the resulting composition is ready to be used in the curtain coating process. Alternatively, each of the substances may prepared by itself, e.g. be dissolved (or suspended or dispersed in cold water) before mixing the substances with each other, heating and then adding the surfactant in order to obtain the final composition.
  • In FIGS. 1 a-1 d is schematically illustrated examples of a coated substrate according to the present invention. In FIG. 1 a is shown a coated substrate where the substrate 1 is a paperboard comprising at least one fibre based layer, and the paperboard is coated with a gas barrier coating layer 2 comprising a coating composition according to the present invention. In FIG. 1 b, the coated substrate is further provided with a pigment coating layer 3 on the opposite side of the paperboard layer 1, i.e. on that side of the paperboard layer 1 that is not coated with the barrier coating 2. In FIG. 1 c, the coated substrate of FIG. 1 a is also provided with a pigment coating layer 3, but in this example the pigment coating layer 3 is provided between the paperboard layer 1 and the barrier coating layer 2. Consequently, the barrier coating 2 has been applied on top of the already applied pigment coating layer 3. Finally, in FIG. 1 d, the coated paperboard of FIG. 1 c has been provided with an additional pigment coating layer 3, resulting in a paperboard layer 1 having a pigment coating layer 3 on both sides and a barrier coating layer 2 applied on one of the pigment coating layers 3.
  • FIGS. 2 a-2 d shows schematically examples of a packaging material according to the present invention. FIGS. 2 a-2 d illustrates a coated substrate corresponding to FIGS. 1 a-1 d respectively, which has been provided with a polyethylene layer 4 on both sides.
  • The present invention is not limited to the disclosed examples, but may be modified in many ways that would be apparent to the skilled person, within the scope of the appended claims.

Claims (30)

1. A curtain coatable gas barrier coating composition comprising a polymer and a surfactant, wherein the polymer is selected from a group consisting of polyvinyl alcohol and polysaccharides, or mixtures thereof, wherein said polysaccharides are soluble or dispersable or suspendable in water and the surfactant is a water soluble non-ionic ethoxylated alcohol.
2. A coating composition according to claim 1, characterized in that the polysaccharides comprise starch, starch derivatives, MFC (micro fibrillar cellulose) and hemicellulose.
3. A coating composition according to claim 2, characterized in that the polymer comprises polyvinyl alcohol alone or in a mixture with starch and/or a starch derivative and/or MFC and/or hemicellulose.
4. A coating composition according to claim 2, characterized in that the polymer comprises starch alone, or a starch derivative alone, or a mixture thereof, or either one in mixture with MFC and/or hemicellulose.
5. A coating composition according to claim 2, characterized in that the polymer comprises MFC alone or hemicellulose alone, or a mixture thereof.
6. The coating composition according to any one of claims 1-5, characterized in that the surfactant is a saturated iso-C13 alcohol.
7. The coating composition according to claim 6, characterized in that the surfactant has the formula RO(CH2CH2O)xH, wherein R═iso-C13H27 and x is 8 or higher
8. The coating composition according to any one of claims 1-5, characterized in that the surfactant is an alkyl polyethylene glycol ether based on C10-Guerbet alcohol, with a degree of ethoxylation of 7 or higher.
9. The coating composition according to any one of claims 1-5, characterized in that the surfactant is a saturated short-chain fatty alcohol.
10. The coating composition according to claim 9, characterized in that the surfactant has the formula RO(CH2CH2O)xH, wherein R═a saturated short-chain alcohol and x is 5 or higher.
11. The coating composition according to any one of the preceding claims, characterized in that it comprises a concentration of 0.05-2.,0 weight % of non-ionic ethoxylated alcohol surfactant, preferably 0.1-1.0%, and more preferably 0.2-0.5 weight %, of the total weight of the bone dry coating composition.
12. The coating composition according to any one of the preceding claims, characterized in that it comprises a solid content of the composition of 4-20%; preferably 6-12% and more preferably 8-10%.
13. The coating composition according to any one of the preceding claims, characterized in that it comprises platy particles.
14. The coating composition according to claim 13, characterized in that it comprises Montmorillonite clay in nano particle form.
15. The coating composition according to any one of the preceding claims, characterized in that it comprises a weight percentage of approximately 80-99.5% of dry matter in the composition constituted by a polymer chosen as the main component, and that the amount of additives to the main component, such as other polymers or platy particles and surfactant, have a weight percentage of approximately 0.05-20% of dry matter in the composition.
16. A method for providing a substrate with a gas barrier layer applied in at least one coating step, comprising application of a coating composition as defined in any one of claims 1-15, by curtain coating the substrate with the coating composition in at least one coating step.
17. The method according to claim 16, comprising curtain coating the substrate in a first step with a coating composition containing polyvinyl alcohol and in a second step with a coating composition containing polyvinyl alcohol.
18. The method according to claim 16, comprising curtain coating the substrate in a first step with a coating composition comprising a polysaccharide and in a second step with a coating composition comprising a polysaccharide.
19. The method according to claim 16, comprising curtain coating the substrate in a first step with a coating composition containing a polysaccharide and in a second step with a coating composition comprising polyvinyl alcohol.
20. The method according to claim 16, comprising curtain coating the substrate in a first step with a coating composition containing polyvinyl alcohol and in a second step with a coating composition comprising a polysaccharide.
21. The method according to claim 16, comprising curtain coating the substrate in a first step with a coating composition comprising polyvinyl alcohol, MFC, clay in nano particle form and a water soluble non-ionic ethoxylated alcohol, and curtain coating the substrate in a second step with a coating composition comprising starch or a starch derivative and a water soluble non-ionic ethoxylated alcohol or vice versa.
22. The method according to claim 16, comprising curtain coating the substrate in a first step with a coating composition comprising polyvinyl alcohol, hemicellulose, clay in nano particle form and a water soluble non-ionic ethoxylated alcohol, and curtain coating the substrate in a second step with a coating composition comprising starch or a starch derivative and a water soluble non-ionic ethoxylated alcohol or vice versa.
23. The method according to any one of claims 16-22, wherein the coat weight of the at least one coating layer is 0.4 g/m2 or more and less than 7.0 g/m2.
24. The method according to any one of claims 16-23, wherein the coat weight of the gas barrier layer is 0.8 g/m2 or more and less than 7.0 g/m2.
25. The method according to any one of claims 16-24, wherein the substrate is a fibre substrate or a paper or a paperboard.
26. A coated substrate having at least one gas barrier layer (2) obtained by coating a substrate (1) with a coating composition as defined in any one of claims 1-15.
27. The coated substrate according to any one of claims 26, wherein the gas barrier layer (2) has a coat weight of 0.8 g/m2 or more and less than 7.0 g/m2.
28. The coated substrate according to any one of claims 26-27, wherein the substrate (1) is a paperboard comprising at least one fibre based layer coated with the coating composition.
29. A packaging material comprising a coated paperboard according to claim 28, further comprising a layer (4) of low density polyethylene on each side of the coated paperboard, and having an OTR value of less than 40 ml/m2·24 h·1 atm, and preferably less than 10 ml/m2·24 h·1 atm.
30. A liquid package made from a packaging material according to claim 29.
US14/355,459 2011-10-31 2012-10-30 Coating composition, a method for coating a substrate, a coated substrate, a packaging material and a liquid package Abandoned US20140251856A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
SE1100821-6 2011-10-31
SE1100821 2011-10-31
SE1250261A SE1250261A1 (en) 2011-10-31 2012-03-19 Coating composition, a method for coating a substrate, a coated substrate, a packaging material and liquid packaging
SE1250261-3 2012-03-19
PCT/EP2012/071495 WO2013064501A1 (en) 2011-10-31 2012-10-30 A coating composition, a method for coating a substrate, a coated substrate, a packaging material and a liquid package

Publications (1)

Publication Number Publication Date
US20140251856A1 true US20140251856A1 (en) 2014-09-11

Family

ID=47115958

Family Applications (2)

Application Number Title Priority Date Filing Date
US14/355,459 Abandoned US20140251856A1 (en) 2011-10-31 2012-10-30 Coating composition, a method for coating a substrate, a coated substrate, a packaging material and a liquid package
US14/355,474 Active 2036-01-07 US10125286B2 (en) 2011-10-31 2012-10-30 Coating composition, a method for coating a substrate, a coated substrate, a packaging material and a liquid package

Family Applications After (1)

Application Number Title Priority Date Filing Date
US14/355,474 Active 2036-01-07 US10125286B2 (en) 2011-10-31 2012-10-30 Coating composition, a method for coating a substrate, a coated substrate, a packaging material and a liquid package

Country Status (8)

Country Link
US (2) US20140251856A1 (en)
EP (2) EP2773707B1 (en)
CN (2) CN103958626B (en)
BR (2) BR112014010355B1 (en)
CA (2) CA2850269C (en)
RU (2) RU2627404C2 (en)
SE (1) SE1250261A1 (en)
WO (2) WO2013064501A1 (en)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9272095B2 (en) 2011-04-01 2016-03-01 Sio2 Medical Products, Inc. Vessels, contact surfaces, and coating and inspection apparatus and methods
US9458536B2 (en) 2009-07-02 2016-10-04 Sio2 Medical Products, Inc. PECVD coating methods for capped syringes, cartridges and other articles
US9545360B2 (en) 2009-05-13 2017-01-17 Sio2 Medical Products, Inc. Saccharide protective coating for pharmaceutical package
US9554968B2 (en) 2013-03-11 2017-01-31 Sio2 Medical Products, Inc. Trilayer coated pharmaceutical packaging
US9572526B2 (en) 2009-05-13 2017-02-21 Sio2 Medical Products, Inc. Apparatus and method for transporting a vessel to and from a PECVD processing station
US9662450B2 (en) 2013-03-01 2017-05-30 Sio2 Medical Products, Inc. Plasma or CVD pre-treatment for lubricated pharmaceutical package, coating process and apparatus
US9664626B2 (en) 2012-11-01 2017-05-30 Sio2 Medical Products, Inc. Coating inspection method
US9764093B2 (en) 2012-11-30 2017-09-19 Sio2 Medical Products, Inc. Controlling the uniformity of PECVD deposition
US9863042B2 (en) 2013-03-15 2018-01-09 Sio2 Medical Products, Inc. PECVD lubricity vessel coating, coating process and apparatus providing different power levels in two phases
US9878101B2 (en) 2010-11-12 2018-01-30 Sio2 Medical Products, Inc. Cyclic olefin polymer vessels and vessel coating methods
US9903782B2 (en) 2012-11-16 2018-02-27 Sio2 Medical Products, Inc. Method and apparatus for detecting rapid barrier coating integrity characteristics
US9937099B2 (en) 2013-03-11 2018-04-10 Sio2 Medical Products, Inc. Trilayer coated pharmaceutical packaging with low oxygen transmission rate
US20180251976A1 (en) * 2015-09-11 2018-09-06 Rockwool International A/S Acoustic panel
JP2018533499A (en) * 2015-10-29 2018-11-15 テトラ ラバル ホールディングス アンド ファイナンス エス エイ Laminated packaging material comprising barrier film or sheet, barrier film or sheet and packaging container made therefrom
US10189603B2 (en) 2011-11-11 2019-01-29 Sio2 Medical Products, Inc. Passivation, pH protective or lubricity coating for pharmaceutical package, coating process and apparatus
US10201660B2 (en) 2012-11-30 2019-02-12 Sio2 Medical Products, Inc. Controlling the uniformity of PECVD deposition on medical syringes, cartridges, and the like
US10214859B2 (en) 2016-04-05 2019-02-26 Fiberlean Technologies Limited Paper and paperboard products
US11066745B2 (en) 2014-03-28 2021-07-20 Sio2 Medical Products, Inc. Antistatic coatings for plastic vessels
US11077233B2 (en) 2015-08-18 2021-08-03 Sio2 Medical Products, Inc. Pharmaceutical and other packaging with low oxygen transmission rate
US11116695B2 (en) 2011-11-11 2021-09-14 Sio2 Medical Products, Inc. Blood sample collection tube
EP3864075A4 (en) * 2018-10-08 2022-08-03 Stora Enso Oyj An oxygen barrier layer comprising microfibrillated dialdehyde cellulose
US11624115B2 (en) 2010-05-12 2023-04-11 Sio2 Medical Products, Inc. Syringe with PECVD lubrication
US11846072B2 (en) 2016-04-05 2023-12-19 Fiberlean Technologies Limited Process of making paper and paperboard products
WO2024204251A1 (en) * 2023-03-30 2024-10-03 Toppanホールディングス株式会社 Laminate and packaging bag

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8919662B2 (en) 2004-06-24 2014-12-30 Enviroscent, Inc. Scent devices and methods
US9132204B2 (en) 2010-03-31 2015-09-15 Enviroscent, Inc. Methods, compositions and articles for olfactory-active substances
GB2502241B (en) * 2013-09-19 2014-04-30 Rockwell Solutions Ltd Packaging material and methods for manufacturing the same
US9149552B1 (en) * 2014-09-29 2015-10-06 Enviroscent, Inc. Coating providing modulated release of volatile compositions
EP3229861B1 (en) * 2014-12-12 2019-01-30 Sanofi Medical apparatus package
EP3307333A1 (en) 2015-06-09 2018-04-18 Enviroscent, Inc. Formed three-dimensional matrix and associated coating providing modulated release of volatile compositions
USD800286S1 (en) 2015-07-31 2017-10-17 Enviroscent, Inc. Collection of scent-infused wound sheets
EP3178648A1 (en) 2015-12-09 2017-06-14 Cargill, Incorporated Barrier coatings
SE539754C2 (en) * 2016-03-22 2017-11-14 Stora Enso Oyj Oxygen barrier film and laminate and methods of manufacturing the same
JP6234654B1 (en) 2016-03-28 2017-11-22 日本製紙株式会社 Paper barrier material
WO2018064449A1 (en) 2016-09-30 2018-04-05 Enviroscent, Inc. Articles formed of pulp base materials with modulated scent release
UA120951C2 (en) * 2017-07-06 2020-03-10 Іван Георгійович Рабізо THERMAL STORAGE FOR CARGO TRANSPORTATION
WO2019042694A1 (en) 2017-08-28 2019-03-07 Kuraray Co. Ltd Gas barrier coating composition for paper and films
KR102493718B1 (en) 2017-10-04 2023-01-30 닛폰세이시가부시키가이샤 barrier material
KR101968044B1 (en) * 2018-07-09 2019-06-19 한솔제지 주식회사 Preparation method of paper having moisture and gas barrier properties
EP3660113A1 (en) 2018-11-27 2020-06-03 BillerudKorsnäs AB Method for forming a pvoh based barrier layer on a substrate
US20220009684A1 (en) 2018-11-27 2022-01-13 Billerudkorsnas Ab Enhanced pvoh-based barrier layer composition, barrier layer and methods for its manufacture
EP3660114A1 (en) 2018-11-27 2020-06-03 BillerudKorsnäs AB Enhanced pvoh-based barrier layer composition, barrier layer and methods for its manufacture
CN110200114A (en) * 2019-07-09 2019-09-06 广西隆盛源茶业有限公司 A kind of basement flower post-processing approach improving Jasmine utilization rate
CN110747690B (en) * 2019-10-29 2021-10-22 浙江科技学院 Nano microcrystalline cellulose coating for improving printing quality of paper and preparation method
CN111519466A (en) * 2020-03-13 2020-08-11 浙江金加浩绿色纳米材料股份有限公司 Fluorocarbon-free biodegradable oil-proof paper and preparation method thereof
US11613108B2 (en) 2020-07-20 2023-03-28 Gpcp Ip Holdings Llc Packaging material
JP6910672B1 (en) * 2020-10-23 2021-07-28 竹本油脂株式会社 A method for manufacturing a resin modifier for packaging, a modified resin sheet, a modified resin sheet, and a method for manufacturing a molded product using the modified resin sheet.
SE545615C2 (en) 2021-06-09 2023-11-14 Stora Enso Oyj Barrier coating comprising a first and a second polysaccharide for paper and paperboard, coated substrate and method for the production thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010005550A1 (en) * 1998-03-10 2001-06-28 Jorgen Bengtsson Laminated packaging materials and packaging containers produced therefrom
US20010025021A1 (en) * 2000-02-25 2001-09-27 Lars Wittkowski Preparation of emulsifiable ethylene polymers
US20060173104A1 (en) * 2003-03-21 2006-08-03 Paul Gatenholm Polymeric film or coating comprising hemicelulose
US20100323189A1 (en) * 2008-02-08 2010-12-23 Sun Chemical, B.V. Oxygen barrier coating composition

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1461806A1 (en) * 1987-07-01 1989-02-28 Всесоюзное научно-производственное объединение целлюлозно-бумажной промышленности Method of producing primed paper
ATE149561T1 (en) * 1990-11-16 1997-03-15 Procter & Gamble A MILD DISHWASHER DETERGENT COMPOSITION CONTAINING ALKYLETHOXYCARBOXYL SURFACTANT AND CALCIUM OR MAGNESIUM IONS
RU2156775C2 (en) * 1994-11-03 2000-09-27 Геркулес Инкорпорейтед Latex system and method of preparation thereof
DE19510825A1 (en) * 1995-03-24 1996-09-26 Henkel Kgaa Anticorrosive cleaner for tinned steel
US6153288A (en) * 1997-07-24 2000-11-28 Avery Dennison Corporation Ink-receptive compositions and coated products
US7008992B1 (en) * 1998-07-22 2006-03-07 E. I. Du Pont De Nemours And Company Water insoluble non-ionic graft copolymers
US6447712B1 (en) * 1998-12-28 2002-09-10 University Of Washington Method for sintering ceramic tapes
SE520187C2 (en) * 2001-10-09 2003-06-10 Tetra Laval Holdings & Finance Laminated packaging material, method of preparation and packaging container made of the packaging material
US20040121080A1 (en) 2002-10-17 2004-06-24 Robert Urscheler Method of producing a coated substrate
US20050042443A1 (en) * 2003-08-22 2005-02-24 Miller Gerald D. PVOH barrier performance on substrates
GB0416900D0 (en) * 2004-07-29 2004-09-01 Arjo Wiggins Fine Papers Ltd Curtain coating process using a high solids content composition
US8367756B2 (en) * 2007-12-27 2013-02-05 Eastman Kodak Company Stabilized coating dispersions for porous inkjet recording media
US8080681B2 (en) * 2007-12-28 2011-12-20 Chevron Phillips Chemical Company Lp Nano-linked metallocene catalyst compositions and their polymer products
EP2182113A1 (en) 2008-10-30 2010-05-05 Kuraray Europe GmbH Method of curtain coating substrates without using tensides

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010005550A1 (en) * 1998-03-10 2001-06-28 Jorgen Bengtsson Laminated packaging materials and packaging containers produced therefrom
US20010025021A1 (en) * 2000-02-25 2001-09-27 Lars Wittkowski Preparation of emulsifiable ethylene polymers
US20060173104A1 (en) * 2003-03-21 2006-08-03 Paul Gatenholm Polymeric film or coating comprising hemicelulose
US20100323189A1 (en) * 2008-02-08 2010-12-23 Sun Chemical, B.V. Oxygen barrier coating composition

Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10390744B2 (en) 2009-05-13 2019-08-27 Sio2 Medical Products, Inc. Syringe with PECVD lubricity layer, apparatus and method for transporting a vessel to and from a PECVD processing station, and double wall plastic vessel
US9545360B2 (en) 2009-05-13 2017-01-17 Sio2 Medical Products, Inc. Saccharide protective coating for pharmaceutical package
US10537273B2 (en) 2009-05-13 2020-01-21 Sio2 Medical Products, Inc. Syringe with PECVD lubricity layer
US9572526B2 (en) 2009-05-13 2017-02-21 Sio2 Medical Products, Inc. Apparatus and method for transporting a vessel to and from a PECVD processing station
US9458536B2 (en) 2009-07-02 2016-10-04 Sio2 Medical Products, Inc. PECVD coating methods for capped syringes, cartridges and other articles
US11624115B2 (en) 2010-05-12 2023-04-11 Sio2 Medical Products, Inc. Syringe with PECVD lubrication
US9878101B2 (en) 2010-11-12 2018-01-30 Sio2 Medical Products, Inc. Cyclic olefin polymer vessels and vessel coating methods
US11123491B2 (en) 2010-11-12 2021-09-21 Sio2 Medical Products, Inc. Cyclic olefin polymer vessels and vessel coating methods
US9272095B2 (en) 2011-04-01 2016-03-01 Sio2 Medical Products, Inc. Vessels, contact surfaces, and coating and inspection apparatus and methods
US10577154B2 (en) 2011-11-11 2020-03-03 Sio2 Medical Products, Inc. Passivation, pH protective or lubricity coating for pharmaceutical package, coating process and apparatus
US11724860B2 (en) 2011-11-11 2023-08-15 Sio2 Medical Products, Inc. Passivation, pH protective or lubricity coating for pharmaceutical package, coating process and apparatus
US11116695B2 (en) 2011-11-11 2021-09-14 Sio2 Medical Products, Inc. Blood sample collection tube
US11148856B2 (en) 2011-11-11 2021-10-19 Sio2 Medical Products, Inc. Passivation, pH protective or lubricity coating for pharmaceutical package, coating process and apparatus
US11884446B2 (en) 2011-11-11 2024-01-30 Sio2 Medical Products, Inc. Passivation, pH protective or lubricity coating for pharmaceutical package, coating process and apparatus
US10189603B2 (en) 2011-11-11 2019-01-29 Sio2 Medical Products, Inc. Passivation, pH protective or lubricity coating for pharmaceutical package, coating process and apparatus
US9664626B2 (en) 2012-11-01 2017-05-30 Sio2 Medical Products, Inc. Coating inspection method
US9903782B2 (en) 2012-11-16 2018-02-27 Sio2 Medical Products, Inc. Method and apparatus for detecting rapid barrier coating integrity characteristics
US10201660B2 (en) 2012-11-30 2019-02-12 Sio2 Medical Products, Inc. Controlling the uniformity of PECVD deposition on medical syringes, cartridges, and the like
US10363370B2 (en) 2012-11-30 2019-07-30 Sio2 Medical Products, Inc. Controlling the uniformity of PECVD deposition
US11406765B2 (en) 2012-11-30 2022-08-09 Sio2 Medical Products, Inc. Controlling the uniformity of PECVD deposition
US9764093B2 (en) 2012-11-30 2017-09-19 Sio2 Medical Products, Inc. Controlling the uniformity of PECVD deposition
US9662450B2 (en) 2013-03-01 2017-05-30 Sio2 Medical Products, Inc. Plasma or CVD pre-treatment for lubricated pharmaceutical package, coating process and apparatus
US10537494B2 (en) 2013-03-11 2020-01-21 Sio2 Medical Products, Inc. Trilayer coated blood collection tube with low oxygen transmission rate
US11298293B2 (en) 2013-03-11 2022-04-12 Sio2 Medical Products, Inc. PECVD coated pharmaceutical packaging
US10912714B2 (en) 2013-03-11 2021-02-09 Sio2 Medical Products, Inc. PECVD coated pharmaceutical packaging
US9554968B2 (en) 2013-03-11 2017-01-31 Sio2 Medical Products, Inc. Trilayer coated pharmaceutical packaging
US11684546B2 (en) 2013-03-11 2023-06-27 Sio2 Medical Products, Inc. PECVD coated pharmaceutical packaging
US9937099B2 (en) 2013-03-11 2018-04-10 Sio2 Medical Products, Inc. Trilayer coated pharmaceutical packaging with low oxygen transmission rate
US10016338B2 (en) 2013-03-11 2018-07-10 Sio2 Medical Products, Inc. Trilayer coated pharmaceutical packaging
US11344473B2 (en) 2013-03-11 2022-05-31 SiO2Medical Products, Inc. Coated packaging
US9863042B2 (en) 2013-03-15 2018-01-09 Sio2 Medical Products, Inc. PECVD lubricity vessel coating, coating process and apparatus providing different power levels in two phases
US11066745B2 (en) 2014-03-28 2021-07-20 Sio2 Medical Products, Inc. Antistatic coatings for plastic vessels
US11077233B2 (en) 2015-08-18 2021-08-03 Sio2 Medical Products, Inc. Pharmaceutical and other packaging with low oxygen transmission rate
US11186988B2 (en) * 2015-09-11 2021-11-30 Rockwool International A/S Acoustic panel
US20180251976A1 (en) * 2015-09-11 2018-09-06 Rockwool International A/S Acoustic panel
JP2018533499A (en) * 2015-10-29 2018-11-15 テトラ ラバル ホールディングス アンド ファイナンス エス エイ Laminated packaging material comprising barrier film or sheet, barrier film or sheet and packaging container made therefrom
US11274399B2 (en) 2016-04-05 2022-03-15 Fiberlean Technologies Limited Paper and paperboard products
US10214859B2 (en) 2016-04-05 2019-02-26 Fiberlean Technologies Limited Paper and paperboard products
US10801162B2 (en) 2016-04-05 2020-10-13 Fiberlean Technologies Limited Paper and paperboard products
US11732421B2 (en) 2016-04-05 2023-08-22 Fiberlean Technologies Limited Method of making paper or board products
US11846072B2 (en) 2016-04-05 2023-12-19 Fiberlean Technologies Limited Process of making paper and paperboard products
EP3864075A4 (en) * 2018-10-08 2022-08-03 Stora Enso Oyj An oxygen barrier layer comprising microfibrillated dialdehyde cellulose
WO2024204251A1 (en) * 2023-03-30 2024-10-03 Toppanホールディングス株式会社 Laminate and packaging bag

Also Published As

Publication number Publication date
CN103958625A (en) 2014-07-30
SE1250261A1 (en) 2013-05-01
EP2773707A1 (en) 2014-09-10
CA2850269C (en) 2019-12-24
EP2773708B8 (en) 2015-04-22
CN103958626A (en) 2014-07-30
EP2773707B1 (en) 2015-03-04
BR112014010405A2 (en) 2017-04-25
BR112014010355B1 (en) 2021-09-08
US20140377486A1 (en) 2014-12-25
CA2850267A1 (en) 2013-05-10
BR112014010355A2 (en) 2017-04-18
US10125286B2 (en) 2018-11-13
CA2850267C (en) 2020-06-30
WO2013064501A1 (en) 2013-05-10
RU2014121945A (en) 2015-12-10
CN103958626B (en) 2016-08-24
CN103958625B (en) 2016-09-14
EP2773708B1 (en) 2015-03-04
RU2627404C2 (en) 2017-08-08
BR112014010405B1 (en) 2021-06-01
RU2014121943A (en) 2015-12-10
EP2773708A1 (en) 2014-09-10
CA2850269A1 (en) 2013-05-10
WO2013064500A1 (en) 2013-05-10
RU2626848C2 (en) 2017-08-02

Similar Documents

Publication Publication Date Title
CA2850267C (en) A coating composition, a method for coating a substrate, a coated substrate, a packaging material and a liquid package
US8734959B2 (en) Barrier material and method for making the same
EP2551105B1 (en) Laminated body, method for producing same, and molding container
US20100112226A1 (en) Process for the curtain-coating of substrates without the use of tensides
CN103946449B (en) Dispersion based on polyvinyl acetate is used as the purposes of barrier layer
Tanninen et al. Thermal and mechanical durability of starch‐based dual polymer coatings in the press forming of paperboard
TW202200868A (en) Paper material and flexible packaging material using the same
IT201800007179A1 (en) WATER DISPERSION OF ETHYLENE-VINYL ALCOHOL COPOLYMERS AND OXYGEN BARRIER MULTI-LAYER FILM COATED WITH THIS DISPERSION
KR20230121770A (en) Aqueous Ethyl Cellulose Dispersion
Thitsartarn et al. Superhydrophobicity of paperboard packaging by hierarchical surface roughness modification of polylactic acid electrospraying
KR20080006536A (en) Phospholipid lubricant for coating moving webs
JP2023500619A (en) Coatings to reduce oil absorption of cellulosic webs
KR20230025406A (en) Coating structures, sheet-like products and uses thereof
WO2024218669A1 (en) Barrier coating for paper and paperboard
Jansson et al. Barrier and film properties of plastisol coatings, a water free coating application based on mixtures of starch, poly (vinyl alcohol) and poly (alkyl methacrylate)
GB2617573A (en) Material having a barrier layer comprising lignosulfonate
CN102199901B (en) Curtain stabilizers for paper production and processing

Legal Events

Date Code Title Description
AS Assignment

Owner name: BILLERUDKORSNAS SKOG & INDUSTRI AKTIEBOLAGE, SWEDE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LARSSON, JOHAN;KARLSSON, ANDERS;SIGNING DATES FROM 20140814 TO 20140815;REEL/FRAME:035206/0364

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION