JP5446090B2 - Propylene-based resin composition and pellets thereof - Google Patents

Description

  The present invention relates to a propylene-based resin composition, pellets thereof, and a molded body made of them. More specifically, the present invention relates to a propylene-based resin composition, a pellet thereof, and a molded body comprising them, in which a reduction in bending strength is suppressed, heat resistance is excellent, and a molded body having few white spots and excellent appearance is obtained.

Conventionally, it has been known that fillers, glass fibers, and the like are blended as means for improving mechanical strength such as rigidity and impact strength of a crystalline thermoplastic resin.
For example, JP-A-3-121146 contains a resin component composed of polyolefin and a modified olefin polymer as a molding polyolefin resin composition having improved mechanical strength and the like, and reinforcing fibers, A polyolefin resin composition for long fiber reinforced molding is described in which the fibers have a length of at least 2 mm in the resin.

  Japanese Patent Laid-Open No. 2005-60678 discloses a crystalline thermoplastic resin as a means for improving the mechanical strength and the glossiness of a molded product, and a crystalline thermal resin having a crystallization temperature lower by 10 ° C. or more than that thermoplastic resin. A composition containing a plastic resin and fibers is described.

Japanese Patent Laid-Open No. 3-121146 Japanese Patent Laid-Open No. 2005-60678

  However, with respect to the molded article comprising the polyolefin resin composition and pellets described in the above publications, etc., it is possible to suppress the decrease in the bending strength and further improve the appearance by reducing heat resistance and white spots. It was desired.

  Under such circumstances, an object of the present invention is to provide a propylene-based resin composition, a pellet thereof, and a molding comprising them, in which a reduction in bending strength is suppressed, a heat resistance is excellent, and a molded body having few white spots and an excellent appearance is obtained. To provide a body.

As a result of intensive studies in view of the actual situation, the present inventors have found that the present invention can solve the above problems, and have completed the present invention.
That is, the present invention
1 wt% or more and less than 50 wt% of a propylene polymer (component (A)) having a molecular weight distribution of 1.0 to 2.9 and an isotactic pentad fraction of 0.9 to 1.0, and a molecular weight Propylene containing a propylene polymer (component (B)) having a distribution of 3.0 to 10 and an isotactic pentad fraction of 0.9 to 1.0 and exceeding 50% by weight and 99% by weight or less (Based on the total weight of component (A) and component (B) being 100% by weight) and 100 parts by weight of propylene-based resin (I) (component (component (I)) C)) A propylene resin composition containing 5 to 400 parts by weight , wherein the weight average fiber length of the fiber (component (C)) is 5 to 15 mm in the resin composition. It is related to.

The present invention also provides:
A propylene polymer (component (A)) having a molecular weight distribution of 1.0 to 2.9 and an isotactic pentad fraction of 0.9 to 1.0, and a molecular weight distribution of 3.0 to 10 A propylene polymer (component (B)) having an isotactic pentad fraction of 0.9 to 1.0, and a modified polyolefin resin (component (D)) modified with an unsaturated carboxylic acid or derivative thereof, A propylene-based resin composition containing 5 to 400 parts by weight of a fiber (component C) with respect to 100 parts by weight of the propylene-based resin (II) and the propylene-based resin (II). ) Is 1 wt% or more and less than 50 wt%, and the content of component (B) is more than 50 wt% and 99 wt% or less (provided that the weight of component (A) and the weight of component (B)) The total weight is 100% by weight) and the ingredients ( A propylene-based resin composition in which component (D) is 0.1 to 70 parts by weight with respect to a total of 100 parts by weight of the weight of A) and the weight of component (B) , This relates to a propylene-based resin composition in which the weight average fiber length of the fiber (component (C)) is 5 to 15 mm .

  Moreover, this invention concerns on the molded object which consists of said propylene-type resin composition pellet, said propylene-type resin composition, or its pellet.

  According to the present invention, it is possible to obtain a propylene-based resin composition, pellets thereof, and a molded body comprising them, in which a decrease in bending strength is suppressed, heat resistance is excellent, and a molded body having few white spots and excellent appearance is obtained. it can.

The propylene polymer (component (A)) used in the present invention is a propylene polymer having a molecular weight distribution of 1.0 to 2.9 and an isotactic pentad fraction of 0.9 to 1.0. It is.
Examples of the propylene polymer (component (A)) include a propylene homopolymer, a propylene-ethylene random copolymer, a propylene-α-olefin random copolymer, and a copolymer of ethylene and propylene after homopolymerizing propylene. And a propylene block copolymer obtained.

  Examples of the α-olefin used in the propylene polymer (component (A)) include 1-butene, 2-methyl-1-propene, 2-methyl-1-butene, 3-methyl-1-butene, 1-butene, Hexene, 2-ethyl-1-butene, 2,3-dimethyl-1-butene, 2-methyl-1-pentene, 3-methyl-1-pentene, 4-methyl-1-pentene, 3,3-dimethyl- 1-butene, 1-heptene, methyl-1-hexene, dimethyl-1-pentene, ethyl-1-pentene, trimethyl-1-butene, methylethyl-1-butene, 1-octene, methyl-1-pentene, ethyl -1-hexene, dimethyl-1-hexene, propyl-1-heptene, methylethyl-1-heptene, trimethyl-1-pentene, propyl-1-pentene, diethyl-1- Ten, 1-nonene, 1-decene, 1-undecene, 1-dodecene, and the like. 1-butene, 1-pentene, 1-hexene and 1-octene are preferable.

The molecular weight distribution of the propylene polymer (component (A)) is 1.0 to 2.9, and preferably 1.2 from the viewpoint of improving the appearance of the molded body and easy to produce the molded body. It is -2.5, More preferably, it is 1.5-2.4.
The molecular weight distribution is measured by gel permeation chromatography under the conditions described in JP-A No. 2001-302858.

  The isotactic pentad fraction of the propylene polymer (component (A)) is 0.9 to 1.0, and from the viewpoint of enhancing mechanical strength such as rigidity and easy to produce a molded product, Preferably it is 0.92-1.0, More preferably, it is 0.94-1.0, More preferably, it is 0.94-0.99, Most preferably, it is 0.94-0.97 is there.

The isotactic pentad fraction is a fraction of the propylene monomer unit at the center of the isotactic chain in the pentad unit in the propylene molecular chain. In other words, five propylene monomer units are consecutive. This is the fraction of propylene monomer units at the center of the meso-linked chain.
And the isotactic pentad fraction is A.I. It is measured by the method published in Macromolecules, Vol. 6, 925 (1973) by Zambelli et al., Ie using ¹³ C-NMR.
However, the assignment of the NMR absorption peak is performed based on Macromolecules, Vol. 8, page 687 (1975), which was subsequently published.

  The melting point (Tm) of the propylene polymer (component (A)) is preferably 140 to 160 ° C. from the viewpoint of improving the appearance of the molded article and enhancing the mechanical strength such as rigidity and impact strength. More preferably, it is 145-160 degreeC, More preferably, it is 145-155 degreeC.

And melting | fusing point (Tm) is the peak temperature of the peak in which the endothermic amount is the maximum in the melting endothermic curve measured according to the following method.
Using a differential scanning calorimeter (DSC-7 type rapid quenching type manufactured by PerkinElmer Co., Ltd.), 10 mg of the specimen was previously heated at 220 ° C. for 5 minutes in a nitrogen atmosphere to melt the specimen, and then 5 ° C./min. The temperature is decreased to 40 ° C. at a temperature decreasing rate. Thereafter, the temperature is raised at 5 ° C./min, and the peak temperature at which the endotherm is maximum in the obtained melting endothermic curve is defined as the melting point (Tm). In addition, the point at which melting of indium (In) measured at a rate of temperature increase of 5 ° C./min using this measuring machine was 156.6 ° C.

  When propylene polymer (component (A)) is propylene-ethylene copolymer, propylene-α-olefin copolymer, propylene-ethylene-α-olefin copolymer, ethylene and / or α-olefin is contained The amount is preferably 0.5% by weight or less, more preferably 0.3% by weight or less, from the viewpoint of improving the appearance of the molded body and increasing the mechanical strength such as rigidity and impact strength. More preferably, it is 0.1% by weight or less. The content of ethylene and / or α-olefin is determined by using the IR method or NMR method described in “New Edition Polymer Analysis Handbook” (The Chemical Society of Japan, Kinokuniya Shoten (1995)). To measure.

  The 2,1-bond amount of the propylene polymer (component (A)) is preferably 0 mol% from the viewpoint of improving the appearance of the molded body and increasing the mechanical strength such as rigidity and impact strength. Is more than 1.2 mol%, more preferably more than 0 mol% and 1.0 mol% or less, and particularly preferably more than 0 mol% and 0.7 mol% or less. The amount of 2,1-bond is measured by the method described in Polymer, Vol. 30, page 1350 (1989).

  The melt flow rate (MFR) of the propylene polymer (component (A)) prevents the dispersibility of the fibers (component (C)) in the molded body, the appearance of the molded body, and the impact strength from decreasing. From the viewpoint, it is preferably 1 to 500 g / 10 minutes, more preferably 5 to 300 g / 10 minutes, still more preferably 10 to 200 g / 10 minutes, and still more preferably 50 to 150 g / 10 minutes. In addition, MFR is A. S. T.A. M.M. It is a value measured at 230 ° C. and 21.2 N load according to D1238.

  As a manufacturing method of a propylene polymer (component (A)), the method of manufacturing by a solution polymerization method, a slurry polymerization method, a bulk polymerization method, a gas phase polymerization method etc. is mentioned. Moreover, the method of using these polymerization methods independently may be used, and the method of combining 2 or more types may be used. And as a manufacturing method of a propylene polymer (component (A)), for example, "New polymer manufacturing process" (edited by Koji Saeki, Industrial Research Committee (1994)), JP-A-4-323207, JP Examples thereof include polymerization methods described in JP-A-61-287917.

  The catalyst used for the production of the propylene polymer (component (A)) is a single site catalyst, preferably a metallocene catalyst. Examples of the metallocene catalyst include a transition metal complex of Group 4 to 6 of the periodic table having at least one cyclopentadienyl skeleton, and an aluminum compound (for example, methylaluminoxane) or boron that can form a counter anion with the metal complex. Examples thereof include a catalyst comprising a compound (for example, triphenylmethyltetrakis (pentafluorophenyl) borate or N, N-dimethylanilium tetrakis (pentafluorophenyl) borate).

  As a production method using a single site catalyst, JP-A-6-172414, JP-A-8-27237, WO2004 / 044403, WO2003 / 040195, WO2003 / 040201, JP-A-4-323207. And polymerization methods described in JP-A-5-125112, JP-A-5-295022 and the like.

The propylene polymer (component (B)) used in the present invention is a propylene polymer having a molecular weight distribution of 3.0 to 10 and an isotactic pentad fraction of 0.9 to 1.0.

  Examples of the propylene polymer (component (B)) include a propylene homopolymer, a propylene-ethylene random copolymer, a propylene-α-olefin random copolymer, and a copolymer of ethylene and propylene after homopolymerizing propylene. And a propylene block copolymer obtained. Examples of the α-olefin used in the propylene polymer (component (B)) include the same α-olefin as used in the propylene polymer (component (A)).

  The molecular weight distribution of the propylene polymer (component (B)) is 3.0 to 10, and is preferably 3.2 to 8 and more preferably 3.4 to 6 from the viewpoint of easy production of a molded product. It is. In addition, molecular weight distribution of a propylene polymer (component (B)) is measured by the method similar to the above-mentioned polypropylene (component (A)).

  The isotactic pentad fraction of the propylene polymer (component (B)) is 0.9 to 1.0, and from the viewpoint of enhancing mechanical strength such as rigidity and easy to produce a molded product, Preferably it is 0.92-1.0, More preferably, it is 0.94-1.0, More preferably, it is 0.94-0.99, Most preferably, it is 0.94-0.97 is there. In addition, the isotactic pentad fraction of a propylene polymer (component (B)) is measured by the same method as the above-mentioned polypropylene (component (A)).

  The melting point (Tm) of the propylene polymer (component (B)) is preferably 155 to 180 ° C, more preferably 160 to 175 ° C, from the viewpoint of increasing mechanical strength such as rigidity and impact strength. More preferably, it is 162-172 degreeC. The melting point (Tm) of the propylene polymer (component (B)) is measured by the same method as that for polypropylene (component (A)).

  When the propylene polymer (component (B)) is a propylene-ethylene copolymer, propylene-α-olefin copolymer, propylene-ethylene-α-olefin copolymer, ethylene and / or α-olefin is contained. The amount is preferably 0.5% by weight or less, more preferably 0.3% by weight or less, from the viewpoint of improving the appearance of the molded body and increasing the mechanical strength such as rigidity and impact strength. More preferably, it is 0.1% by weight or less. The content of ethylene and / or α-olefin is measured by the same method as that for the aforementioned polypropylene (component (A)).

  The melt flow rate (MFR) of the propylene polymer (component (B)) prevents the dispersibility of the fiber (component (C)) in the molded product, the appearance of the molded product, and the impact strength from decreasing. From the viewpoint, it is preferably 1 to 500 g / 10 minutes, more preferably 5 to 300 g / 10 minutes, still more preferably 10 to 200 g / 10 minutes, and still more preferably 50 to 150 g / 10 minutes. In addition, MFR is A. S. T.A. M.M. It is a value measured at 230 ° C. and 21.2 N load according to D1238.

As a production method of the propylene polymer (component (B)) used in the present invention, “new polymer production process” (edited by Koji Saeki, Industrial Research Committee (1994)), JP-A-4-323207, Examples thereof include a solution polymerization method, a slurry polymerization method, a bulk polymerization method, a gas phase polymerization method and the like described in Japanese Utility Model Laid-Open No. 61-287917. And the method of using these polymerization methods independently may be sufficient, and the method of combining at least 2 types may be sufficient.
The catalyst used for the production of the propylene polymer is preferably a multi-site catalyst obtained by using a solid catalyst component containing a titanium atom, a magnesium atom and a halogen atom.

  Examples of the fiber (component (C)) used in the present invention include inorganic fiber, organic fiber, natural fiber, and the like. For example, glass fiber, basalt fiber, carbon fiber, metal fiber (such as copper fiber or stainless fiber), aromatic Examples thereof include polyamide fiber, aromatic polyester fiber, polyester fiber, nylon fiber, kenaf fiber, bamboo fiber, jute fiber, ramie fiber, and cellulose fiber. Among these, inorganic fibers are preferable, and glass fibers are more preferable.

  The weight average fiber length of the fiber (component (C)) is preferably 2 to 100 mm, more preferably from the viewpoint of increasing mechanical strength such as rigidity and impact strength, and from the viewpoint of easy production of a molded product. Is 2 to 50 mm, more preferably 3 to 20 mm, and particularly preferably 5 to 15 mm. In addition, the weight average fiber length of a fiber (component (C)) is the length in the composition of this invention, and is the weight average fiber length measured by the method described in Unexamined-Japanese-Patent No. 2002-5924. is there.

  The fibers (component (C)) may be converged using a sizing agent, and examples of the sizing agent include polyolefin resin, polyurethane resin, polyester resin, acrylic resin, epoxy resin, starch, vegetable oil and the like. . Furthermore, you may mix | blend lubricants, such as acid-modified polyolefin resin, a surface treating agent, and paraffin wax.

  In order to improve the wettability and adhesion between the fiber (component (C)) and the propylene polymer (component (A) and / or component (B)), the surface treatment agent is used for the fiber (component (C)). May be processed in advance. Examples of the surface treatment agent include a silane coupling agent, a titanate coupling agent, an aluminum coupling agent, a chromium coupling agent, a zirconium coupling agent, and a borane coupling agent. Of these, silane coupling agents and titanate coupling agents are preferred, and silane coupling agents are particularly preferred.

  Examples of the silane coupling agent include triethoxysilane, vinyltris (β-methoxyethoxy) silane, γ-methacryloxypropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, β- (3,4). -Epoxycyclohexyl) ethyltrimethoxysilane, N-β- (aminoethyl) -γ-aminopropyltrimethoxysilane, N-β- (aminoethyl) -γ-aminopropylmethyldimethoxysilane, γ-aminopropyltriethoxysilane N-phenyl-γ-aminopropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-chloropropyltrimethoxysilane and the like. Among these, aminosilanes are preferable, and γ-aminopropyltriethoxysilane and N-β- (aminoethyl) -γ-aminopropyltrimethoxysilane are more preferable.

  Examples of the method for treating the fiber (component (C)) with the surface treatment agent include conventionally used methods such as an aqueous solution method, an organic solvent method, and a spray method.

The modified polyolefin resin (component (D)) used in the present invention is
(1) A modified polyolefin resin obtained by graft polymerization of an unsaturated carboxylic acid and / or a derivative thereof to an olefin homopolymer,
(2) a modified polyolefin resin obtained by graft polymerization of an unsaturated carboxylic acid and / or its derivative to a copolymer of two or more olefins,
(3) A modified polyolefin resin obtained by graft polymerization of an unsaturated carboxylic acid and / or a derivative thereof to a block copolymer obtained by homopolymerizing an olefin and then copolymerizing at least two olefins, or
(4) A modified polyolefin resin obtained by copolymerizing at least one olefin and an unsaturated carboxylic acid and / or a derivative thereof.
The modified polyolefin resin (component (D)) may be used alone or in combination of at least two kinds.

  As a method for producing the modified polyolefin resin (component (D)), for example, “Practical Polymer Alloy Design” (Fumio Ide, Industrial Research Group (1996)), Prog. Polym. Sci. 24, 81-142 (1999), Japanese Patent Application Laid-Open No. 2002-308947, and the like, and any of a solution method, a bulk method, and a melt-kneading method may be used. Moreover, the manufacturing method which combined these methods may be sufficient.

Examples of the unsaturated carboxylic acid used in the modified polyolefin resin (component (D)) include maleic acid, fumaric acid, itaconic acid, acrylic acid, and methacrylic acid.
Further, examples of the unsaturated carboxylic acid derivative include acid anhydrides, ester compounds, amide compounds, imide compounds, metal salts, and the like of the above unsaturated carboxylic acids. Specific examples thereof include maleic anhydride, itaconic anhydride. Acid, methyl acrylate, ethyl acrylate, butyl acrylate, glycidyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, glycidyl methacrylate, monoethyl maleate, diethyl maleate, monomethyl fumarate, Examples include dimethyl fumarate, acrylamide, methacrylamide, maleic acid monoamide, maleic acid diamide, fumaric acid monoamide, maleimide, N-butylmaleimide, and sodium methacrylate.
Moreover, you may use what dehydrates and produces | generates unsaturated carboxylic acid by the process grafted to a polypropylene like citric acid and malic acid.

  The unsaturated carboxylic acid and / or derivative thereof is preferably acrylic acid, glycidyl ester of methacrylic acid, or maleic anhydride.

As the modified polyolefin resin (component (D)), preferably,
(5) A modified polyolefin resin obtained by graft polymerization of maleic anhydride to a polyolefin resin having a unit derived from ethylene and / or propylene as a main constituent unit of the polymer, or
(6) A modified polyolefin resin obtained by copolymerizing an olefin mainly composed of ethylene and / or propylene and glycidyl methacrylate or maleic anhydride.

The content of the unit derived from the unsaturated carboxylic acid and / or derivative thereof, which is a constituent unit of the modified polyolefin resin (component (D)), is from the viewpoint of increasing mechanical strength such as impact strength, fatigue characteristics, and rigidity. It is preferably 0.1 to 10% by weight.
The modified polyolefin resin (component (D)) is a modified polyolefin resin obtained by random copolymerization or block copolymerization of (4) at least one olefin and an unsaturated carboxylic acid and / or derivative thereof. In such a case, the content of the unit derived from the unsaturated carboxylic acid and / or derivative thereof is preferably 0.1 to 10% by weight, more preferably 1 to 10% by weight, and still more preferably 3 to 10% by weight. 10% by weight.

Modified polyolefin resin (component (D))
(1) When it is a modified polyolefin resin obtained by graft polymerization of an unsaturated carboxylic acid and / or a derivative thereof to an olefin homopolymer,
(2) a modified polyolefin resin obtained by graft polymerization of an unsaturated carboxylic acid and / or a derivative thereof to a copolymer of at least two olefins, or
(3) In the case of a modified polyolefin resin obtained by graft polymerization of an unsaturated carboxylic acid and / or a derivative thereof to a block copolymer obtained by copolymerizing at least two olefins after homopolymerizing the olefin,
The content of units derived from the unsaturated carboxylic acid and / or derivative thereof is preferably 0.1 to 10% by weight, more preferably 0.1 to 5% by weight, still more preferably 0.3 to 3% by weight.

  The propylene-based resin composition of the present invention comprises a propylene polymer (component (A)) having a molecular weight distribution of 1.0 to 2.9 and an isotactic pentad fraction of 0.9 to 1.0. A propylene-based resin (I) and a fiber containing a propylene polymer (component (B)) having a molecular weight distribution of 3.0 to 10 and an isotactic pentad fraction of 0.9 to 1.0 When (component (C)) is contained, the content of component (A) contained in propylene-based resin (I) is 1% by weight or more and less than 50% by weight, and the content of component (B) is 50% by weight. % And 99% by weight or less. (However, the sum of the weight of component (A) and the weight of component (B) is 100% by weight.)

  From the viewpoint of increasing mechanical strength such as rigidity and impact strength and from the viewpoint of improving the appearance of the molded article, the component (A) is preferably 5% by weight or more and less than 50% by weight, and the component (B) Is more than 50 wt% and 95 wt% or less, more preferably, the component (A) is 10 wt% or more and less than 50 wt%, and the component (B) is more than 50 wt% and 90 wt% or less.

  And content of a fiber (component (C)) is 5-400 weight part with respect to 100 weight part of propylene-type resin (I), and a viewpoint of raising mechanical strength, such as rigidity and impact strength, From the viewpoint of easy production of a molded body, the amount is preferably 10 to 300 parts by weight, particularly preferably 10 to 240 parts by weight.

  The propylene-based resin composition of the present invention has a molecular weight distribution of 1.0 to 2.9 and a propylene polymer (component (A)) having an isotactic pentad fraction of 0.9 to 1.0, Modified with a propylene polymer (component (B)) having a molecular weight distribution of 3.0 to 10 and an isotactic pentad fraction of 0.9 to 1.0, and an unsaturated carboxylic acid or derivative thereof. Content of component (A) contained in propylene resin (II) when propylene resin (II) containing modified polyolefin resin (component (D)) and fiber (component (C)) are contained Is 1% by weight or more and less than 50% by weight, and the content of component (B) is more than 50% by weight and 99% by weight or less. (However, the sum of the weight of component (A) and the weight of component (B) is 100% by weight.)

  From the viewpoint of improving the appearance of the molded article, the component (A) is preferably 5% by weight or more and less than 50% by weight, and the component (B) is more than 50% by weight and 95% by weight or less, more preferably. The component (A) is 10 wt% or more and less than 50 wt%, and the component (B) is more than 50 wt% and 90 wt% or less.

  And content of modified polyolefin resin (component (D)) is 0.1-70 weight part with respect to a total of 100 weight part of the weight of a component (A) and the weight of a component (B), and rigidity or impact From the viewpoint of increasing mechanical strength such as strength, from the viewpoint of improving fatigue characteristics, and from the viewpoint of easy production of a molded product, it is preferably 0.1 to 25, more preferably 0.5 to 25. Yes, and particularly preferably 1-18.

  Furthermore, content of a fiber (component (C)) is 5-400 weight part with respect to 100 weight part of resin (II) containing a component (A), a component (B), and a component (D), From the viewpoint of improving mechanical strength such as rigidity and impact strength, and from the viewpoint of ease of production and molding, it is preferably 10 to 300 parts by weight, particularly preferably 10 to 240 parts by weight.

  If necessary, the propylene-based resin composition of the present invention may contain one or more elastomers. Examples of elastomers include ethylene / α-olefin random copolymers, ethylene / α-olefin / non-conjugated polyene random copolymers, hydrogenated block copolymers, other elastic polymers, and mixtures thereof. .

  Also, depending on the purpose, known substances generally added to propylene polymers, for example, stabilizers such as antioxidants, heat stabilizers, neutralizers, UV absorbers, anti-bubble agents, flame retardants, flame retardants Auxiliaries, dispersants, antistatic agents, lubricants, antiblocking agents such as silica, colorants such as dyes and pigments, plasticizers, nucleating agents, crystallization accelerators, and the like may be blended.

  Further, glassy flakes, mica, glass powder, glass beads, talc, clay, alumina, carbon black, Wollastonite and other plate-like and powdery inorganic compounds, whiskers and the like may be blended.

  As a manufacturing method of the propylene-type resin composition of this invention, well-known various methods are mentioned. For example, after mixing all the components to make a uniform mixture, or by combining several components separately and mixing to make a uniform mixture, the mixture is melt kneaded or pultrusion Law. Examples of a method for obtaining a uniform mixture include a method of mixing with a Henschel mixer, a ribbon blender, a blender or the like. Examples of the melt kneading method include a Banbury mixer, a plast mill, a Brabender plastograph, and a single screw or twin screw extruder.

Among these production methods, the pultrusion method is preferred from the viewpoint of ease of production and enhancing mechanical strength such as rigidity and impact strength. The pultrusion method is basically a method of impregnating a fiber bundle with a resin while drawing a continuous fiber bundle.
(1) A method in which a fiber bundle is passed through an impregnation tank containing a resin emulsion, suspension, or solution, and the fiber bundle is impregnated with resin.
(2) A method of impregnating a fiber bundle by blowing the resin powder onto the fiber bundle, or after passing the fiber bundle through a tank containing the powder and attaching the resin to the fiber,
(3) A method of supplying the resin to the crosshead from an extruder or the like while allowing the fiber bundle to pass through the crosshead, and impregnating the fiber bundle.
The method using the crosshead of the above (3) is preferable, and the method using the crosshead described in JP-A-3-272830 is particularly preferable.

  In the pultrusion method, the resin impregnation operation may be performed in one stage, or may be performed in two or more stages. Moreover, you may blend the pellet manufactured by the pultrusion method, and the pellet manufactured by the melt-kneading method.

The pellets of the present invention are pellets made of the propylene-based resin composition of the present invention, and when applied to injection molding, from the viewpoint of obtaining a molded product that retains excellent strength without impairing injection moldability. The length of the pellet is preferably 2 to 50 mm, more preferably 3 to 20 mm, and still more preferably 5 to 15 mm. Moreover, it is preferable that the contained fiber (component (C)) and pellet length are equal.
In the pellet of the present invention, the contained fiber (component (C)) is equal in pellet length to the fiber (component) contained in the pellet measured by the method described in JP-A-2002-5924. (C)) means that the weight average fiber length is 90 to 110% of the pellet length.

  The molded product of the present invention is a molded product obtained from the propylene-based resin composition of the present invention or a pellet thereof. Examples of the molding method include an injection molding method, an injection compression molding method, a gas assist molding method, and an extrusion molding method.

In particular, when the molded product of the present invention is a molded product obtained from the composition or pellet of the present invention by an injection molding method, from the viewpoint of increasing the mechanical strength of the molded product and the durability, The weight average fiber length of the fiber (component (C)) is preferably 1 to 10 mm, more preferably 1 to 5 mm, and particularly preferably 1 to 3 mm.
A molded body having a weight average fiber length of 1 to 10 mm of fibers (component (C)) in the molded body is produced by injection molding the composition or pellet of the present invention under normal processing conditions. Can do. Preferred processing conditions include a low back pressure during molding, a deep groove in the screw of the molding machine, a low injection speed during molding, a wide flow path in the mold, and a nozzle diameter of the molding machine. For example, enlarge it.

The molded body of the present invention includes a fender, an over fender, a grill guard, a cowl louver, a wheel cap, a side protector, a side molding, a side lower skirt, a front grill, a side, which require mechanical strength, durability and good appearance. Exterior parts such as steps, roof rails, rear spoilers and bumpers, interior parts such as instrument panel lowers and trims that require heat-resistant rigidity, bumper beams, cooling fans, fan shrouds, lamp housings, car heater cases, fuse boxes, air cleaners It can be used for plastic parts for automobiles such as parts in the engine such as cases.
Also, parts of various electrical products such as electric tools, cameras, video cameras, microwave ovens, electric kettles, pots, vacuum cleaners, personal computers, copiers, printers, FDD, CRT machine housings, and various machines such as pump casings It can be used for parts such as parts, tanks, pipes, structures such as building forms.

Hereinafter, the present invention will be described with reference to examples and comparative examples. The manufacturing method of the sample for evaluation used in the examples or comparative examples is shown below.
(1) Manufacturing method of glass fiber reinforced pellet A glass fiber reinforced pellet is manufactured by the method described in Unexamined-Japanese-Patent No. 3-121146. The impregnation temperature is 270 ° C., and the take-up speed is 15 m / min.

(2) Manufacturing method of sample for evaluation Using the following Japan Steel Works molding machine, the glass fiber reinforced pellet obtained in (1) above is injection molded under the following conditions to manufacture a sample for evaluation. .
In addition, as a sample for vitiligo index measurement, a 150 mm × 150 mm, 3 mm thick flat plate is molded and evaluated. In addition, 1 part by weight of a pigment master batch (carbon black concentration: 14% by weight) is added to 100 parts by weight of glass fiber reinforced pellets at the time of blending the raw materials, and colored black.
Nippon Steel Works molding machine Clamping force: 150t
Screw: Deep groove screw for long fibers Screw diameter: 46mm
Screw L / D: 20.3
Molding conditions Cylinder temperature: 250 ° C [Mechanical strength measurement]
200 ° C [for measuring vitiligo index]
Mold temperature: 50 ℃
Back pressure: 0 MPa

Evaluation methods in Examples and Comparative Examples are shown below.
(1) Thermal deformation temperature (unit: ° C)
A. S. T. T. et al. M.M. Measured under the following conditions according to D648.
Load stress: 1.82 MPa
Sample thickness: 6.4mm

(2) Bending strength (unit: MPa)
A. S. T. T. et al. Measure according to MD 790 under the following conditions.
Measurement temperature: 23 ° C
Sample thickness: 3.2 mm
Span: 50mm
Tensile speed: 2 mm / min

(3) Vitiligo index (unit:-)
Using the scanner GT-9600 manufactured by EPSON, with the gradation (256 steps), resolution 50 dpi, exposure 20, gamma 50, highlight 61, shadow 60, and threshold 110, the above (2) method for producing the sample for evaluation The obtained images of 10 flat plates are taken into a computer (analysis area 2186 cm ² ). The area of white spots is calculated from the captured image using the particle analysis function of high-definition image analysis software (IP-1000PC) manufactured by Asahi Engineering.

(4) Weight average fiber length (unit: mm)
The weight average fiber length is measured by a method described in JP-A-2002-5924 using a flat plate molded for vitiligo index measurement.

(5) Molecular weight distribution (unit:-)
Measured by gel permeation chromatography under the following conditions.
Model: 150CV type (Millipore Waters)
Column: Shodex M / S 80
Measurement temperature: 145 ° C
Solvent: Orthodichlorobenzene Sample concentration: 5mg / 8mL
A calibration curve is prepared using standard polystyrene. Mw / Mn of standard polystyrene (NBS706: Mw / Mn = 2.0) measured under these conditions is 1.9 to 2.0.

(6) Isotactic pentad fraction (unit:-)
A 200 mg sample was dissolved in 3 ml of a mixed solvent of orthodichlorobenzene / heavy orthodichlorobenzene (orthodichlorobenzene / heavy orthodichlorobenzene = 4/1 (volume ratio)), and JNM-EX270 manufactured by JEOL Ltd. was dissolved. Use to measure.
The measurement is performed by the method described in Macromolecules, 6, 925 (1973), and the assignment of the NMR absorption peak is performed based on Macromolecules, 8, 687 (1975).

(7) Melting point (unit: ° C)
Using a differential scanning calorimeter (Perkin Elmer DSC-7, rapid cooling type), 10 mg of the specimen is previously melted at 220 ° C. for 5 minutes in a nitrogen atmosphere. Next, after the specimen is melted, the temperature is decreased to 40 ° C. at a temperature decreasing rate of 5 ° C./min. Thereafter, the temperature is raised at 5 ° C./min, and the peak temperature at which the endotherm is maximum in the obtained melting endothermic curve is defined as the melting point (Tm). In addition, the point at which melting of indium (In) measured at a temperature rising rate of 5 ° C./min using this measuring machine is 156.6 ° C.

(8) 2,1-bond amount (unit: mol%)
Polymer, volume 30, page 1350 (1989).

(9) Content of ethylene and / or α-olefin (unit: wt%)
It is obtained by the IR method according to the method described in “New edition polymer handbook” (The Chemical Society of Japan, Kinokuniya Bookstore (1995)).

Example 1
By the method described in JP-A-3-121146, glass fiber reinforced pellets having the composition shown in Table 4 and a glass fiber content of 40% by weight and a pellet length of 9 mm were prepared. The polypropylene resins used were Bassell's Metocene HM562S (MFR = 30 g / 10 min) (A-1) and Sumitomo Chemical's Nobrene Z101A (MFR = 25 g / 10 min) (B-1), and the glass used. The fibers have an average fiber diameter of 17 μm, a count of 2310 g / km, and a bundled number of 4000 (C-1). The modified polyolefin resin used was a maleic anhydride-modified polypropylene resin (MFR = 60 g / 10 min, maleic anhydride graft). Amount = 0.6 wt%) (D-1). Table 1 shows the molecular weight distribution, isotactic pendant fraction, ethylene and / or α-olefin content, 2,1-bond amount, and melting point of the polypropylene resins (A-1 and B-2) used. Further, the obtained glass fiber reinforced pellets were injection molded. Table 2 shows the flexural modulus, flexural strength, IZOD impact strength, heat distortion temperature, vitiligo index, and residual weight average fiber length of the obtained sample. The maleic anhydride-modified polypropylene resin used was prepared according to the method described in Example 1 of Japanese Patent Application Laid-Open No. 2004-197068.

Comparative Example 1
The polypropylene resin used in Example 1 was changed from Basell's Metocene HM562S (MFR = 30 g / 10 min) (A-1) to Sumitomo Chemical's Nobrene Z101A (MFR = 25 g / 10 min) (B-1). Evaluation was performed in the same manner as in Example 3 except that.

Comparative Example 2
Except for changing the polypropylene resin used in Example 1 from Basell's Metocene HM562S (MFR = 30 g / 10 min) (A-1) to FINAPLAS1751 (MFR = 25 g / 10 min) (E-1) manufactured by Atofina. Were evaluated in the same manner as in Example 1.

Ａ−１：Ｂａｓｅｌｌ社製Ｍｅｔｏｃｏｎｅ ＨＭ５６２Ｓ（ＭＦＲ＝３０ｇ/１０分）
Ｂ−１：住友化学社製ノーブレン Ｚ１０１Ａ（ＭＦＲ＝２５ｇ/１０分）
Ｅ−１：アトフィナ社製 ＦＩＮＡＰＬＡＳ１７５１（ＭＦＲ＝２５ｇ/１０分）

A-1: Metalcon HM562S manufactured by Basell (MFR = 30 g / 10 min)
B-1: Nobrene Z101A manufactured by Sumitomo Chemical Co., Ltd. (MFR = 25 g / 10 min)
E-1: FINAPLAS1751 (MFR = 25 g / 10 min) manufactured by Atofina

Ａ−１：Ｂａｓｅｌｌ社製Ｍｅｔｏｃｏｎｅ ＨＭ５６２Ｓ（ＭＦＲ＝３０ｇ/１０分）
Ｂ−１：住友化学社製ノーブレン Ｚ１０１Ａ（ＭＦＲ＝２５ｇ/１０分）
Ｃ−１：ガラス繊維（平均繊維径１７μｍ、番手２３１０ｇ/ｋｍ、収束本数４０００本）
Ｄ−１：無水マレイン酸変性ポリプロピレン樹脂
（ＭＦＲ＝６０ｇ/１０分、マレイン酸グラフト量＝０．６重量％）
Ｅ−１：アトフィナ社製 ＦＩＮＡＰＬＡＳ１７５１（ＭＦＲ＝２５ｇ/１０分）

A-1: Metalcon HM562S manufactured by Basell (MFR = 30 g / 10 min)
B-1: Nobrene Z101A manufactured by Sumitomo Chemical Co., Ltd. (MFR = 25 g / 10 min)
C-1: Glass fiber (average fiber diameter 17 μm, count 2310 g / km, convergence number 4000)
D-1: Maleic anhydride-modified polypropylene resin (MFR = 60 g / 10 min, maleic acid graft amount = 0.6% by weight)
E-1: FINAPLAS1751 (MFR = 25 g / 10 min) manufactured by Atofina

In Example 1, which satisfies the requirements of the present invention, it can be seen that a decrease in the bending strength of the molded article is suppressed, and the appearance and heat resistance of the molded article are excellent.
On the other hand, it turns out that the comparative example 1 which does not contain the polypropylene resin (component (A)) which is a requirement of the present invention has an insufficient appearance of the molded body. Moreover, it turns out that the comparative example 2 which does not satisfy the isotactic pentad fraction of the polypropylene resin (component (A)) which is a requirement of the present invention has insufficient bending strength.

Claims (5)

1 wt% or more and less than 50 wt% of a propylene polymer (component (A)) having a molecular weight distribution of 1.0 to 2.9 and an isotactic pentad fraction of 0.9 to 1.0, and a molecular weight Propylene containing a propylene polymer (component (B)) having a distribution of 3.0 to 10 and an isotactic pentad fraction of 0.9 to 1.0 and exceeding 50% by weight and 99% by weight or less (Based on the total weight of component (A) and component (B) being 100% by weight) and 100 parts by weight of propylene-based resin (I) (component (component (I)) C)) A propylene resin composition containing 5 to 400 parts by weight , wherein the weight average fiber length of the fiber (component (C)) is 5 to 15 mm in the resin composition. . A propylene polymer (component (A)) having a molecular weight distribution of 1.0 to 2.9 and an isotactic pentad fraction of 0.9 to 1.0, and a molecular weight distribution of 3.0 to 10 A propylene polymer (component (B)) having an isotactic pentad fraction of 0.9 to 1.0, and a modified polyolefin resin (component (D)) modified with an unsaturated carboxylic acid or derivative thereof And a propylene-based resin composition containing 5 to 400 parts by weight of a fiber (component C) with respect to 100 parts by weight of the propylene-based resin (II) and the propylene-based resin (II). The content of A) is 1% by weight or more and less than 50% by weight, and the content of component (B) is more than 50% by weight and 99% by weight or less (provided that the weight of component (A) and component (B) Total weight of 100% by weight), and A propylene-based resin composition in which the component (D) is 0.1 to 70 parts by weight with respect to 100 parts by weight of the total of the weight of the component (A) and the weight of the component (B) , in the resin composition In which the weight average fiber length of a fiber (component (C)) is 5-15 mm .   The melting point (Tm) of the propylene polymer (component (A)) is 140 to 160 ° C, and the melting point (Tm) of the propylene polymer (component (B)) is 155 to 180 ° C. Propylene-based resin composition.   It is a pellet which consists of a propylene-type resin composition in any one of Claims 1-3, Comprising: In the said pellet, the propylene-type resin composition in which the fiber (component (C)) is arranged in the mutually parallel state Pellets. A molded article comprising the propylene resin composition or claim 4 propylene resin composition pellets according according to any one of claims 1 to 3, in shaped bodies in the fiber (component (C)) The molded object whose weight average fiber length is 1-10 mm.