Sumitomo Chemical Company, Limited

Yoshiaki Oobayashi

Katsuhisa Kitano

Tsuyoshi Watanabe

Naofumi Naga

Kouji Mizunuma

Masatada Tasaka

Kenji Atarashi

Takeshi Maruyama

Kazunori Teraoka

Disclosed is a polypropylene resin composition including: 100 parts by weight of (A) a propylene-based block copolymer including polymer components (I) and (II), wherein the polymer component (I) is a propylene polymer having an intrinsic viscosity [&#x3b7;]of 0.1-5 dl/g, the polymer component (II) is a propylene polymer comprising propylene units and units of at least one comonomer selected from the group consisting of ethylene and &#x3b1;-olefins having 4-12 carbon atoms and having an intrinsic viscosity [&#x3b7;]of from 1-20 dl/g and the content of the polymer component (II) is 1-70% by weight; and 0.001-5 parts by weight of (B) a nucleating agent composed of particles having an average particle diameter, as measured by the laser diffraction method, of 0.01-3 mm wherein particles having particle diameters of not less than 10 mm account for less than 5% by weight of all the particles of the nucleating agent.

Polypropylene resin composition and formed article

Provided are a polypropylene resin composition which produces only a little mold staining at the time of molding, which is excellent in the stability against light and the molding processability, which has good balance between high rigidity and impact resistance, and which can give a molded article excellent in flow mark appearance and weld appearance when being processed into a molded article, and a molded article produced therefrom. The polypropylene resin composition of the present invention contains 99 to 60 parts by weight of propylene-based polymer (A), 1 to 40 parts by weight of inorganic filler (B) having an average particle diameter of 0.01 to 100 &#x3bc;m, and 0.05 to 5 parts by weight, per 100 parts by weight of the resin composition (I), of an hindered amine-type light stabilizer (C) which satisfies the specified requirements (a), (b) and (c), provided that the combined amount of the propylene-based polymer (A) and the inorganic filler (B) is 100 parts by weight.

Polypropylene resin composition and molded article

A polypropylene resin composition, comprising (A) 51 to 99% by weight of a propylene polymer having a melt flow rate of 10 to 200 g/10 minutes, and containing 0.1 to 40% by weight of an ethylene unit and/or &#x3b1;-olefin unit having 4 to 10 carbon atoms and 60 to 99.9% by weight of a propylene unit, (B) 1 to 49% by weight of an ethylene polymer having density of 0.85 to 0.93 g/cm, and (C) 0.001 to 5 parts by weight of an amide compound as a nucleating agent.

Polypropylene resin composition

A polypropylene resin composition comprising (a) 100 parts by weight of a resin composition, which contains 51 to 99% by weight of a propylene polymer and 1 to 49% by weight of an ethylene polymer having a density of 0.85 to 0.93 g/cm, and (b) 0.001 to 0.5 part by weight of a metal salt defined by a specific chemical formula; and a process for producing such a polypropylene resin composition, comprising the steps of (1) mixing 1 to 100 parts by weight of the metal salt with 100 parts by weight of the propylene polymer and/or the ethylene polymer, thereby producing a master batch, and (2) mixing the master batch with a mixture containing the propylene polymer and the ethylene polymer.

Polypropylene resin composition and process for producing the same

An object of the present invention is to provide a polypropylene-based resin composition which is excellent in mechanical characteristics and molding processability, and is also capable of suppressing emission of a volatile organic compound. Disclosed is a polypropylene-based resin composition comprising a propylene-based block copolymer (A) which satisfies features (a), (b) and (c) shown below, and a zeolite (B) having a molar ratio SiO/AlOof 10 to 60 in an amount of 0.01 to 0.4 part by weight based on 100 parts by weight of the propylene-based block copolymer (A): Feature (a): the propylene-based block copolymer (A) is a propylene-based block copolymer containing a polymer component (I) and a polymer component (II); Feature (b): the polymer component (II) has a content of the units derived from at least one kind of comonomer selected from the group consisting of ethylene and &#x3b1;-olefins having 4 to 12 carbon atoms of from 1 to 80% by weight; and Feature (c): the propylene-based block copolymer (A) has a content of the polymer component (II) of from 5 to 70% by weight.

Polypropylene-based resin composition and molding made from the same

Disclosed is a composite material comprising: resin (I) comprising 10 to 99% by weight of a crystalline thermoplastic resin which is defined as component (A), and 1 to 90% by weight of a crystalline thermoplastic resin having a crystallization temperature lower than that of component (A) by at least 10&#xb0; C., which resin is defined as component (B), and 5 to 400 parts by weight, based on 100 parts by weight of the resin (I), of fiber, which is defined as component (C), wherein the contents of the component (A) and the component (B) are each based on a combined content of these two components.

Fiber-crystalline thermoplastic resin composite material and pellet thereof

Disclosed is a polyolefin resin composition comprising 100 parts by weight of component (A), 0.001 to 10 parts by weight of component (B) and 0.01 to 100 parts by weight of component (C):

Polyolefin resin composition

Disclosed is a polypropylene resin composition comprising (A) 100 parts by weight of polypropylene resin and the following components (B) to (D):

Disclosed is a fiber-reinforced polyolefin resin composite containing a polyolefin resin (components (A)), fibers (component (B)) and a heavy metal deactivator (component (C)), the ratio of the weight of component (A) to the weight of component (B), (component (A)/component (B)), being from 20/80 to 95/5, the ratio of the weight of component (C) to the combined weight of component (A) and component (B), (component (C)/&lsqb;component (A)&plus;component (B)&rsqb;), being from 0.001/100 to 5/100, wherein in the composite substantially all the component (B) have lengths of 2 mm or more. The composite has an improved durability under circumstances of contact with metal. A molded article obtained from the composite is also disclosed.

Fiber-reinforced polyolefin resin composite and molded article obtained from the same

Propylene/ethylene-&agr;-olefin block copolymer and process for producing the same

A propylene/ethylene-.alpha.-olefin block copolymer obtained by block-copolymerizing a polypropylene component with an ethylene-.alpha.-olefin random copolymer component, which satisfies conditions of the following terms (I) to (III):

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Yokohama, Japan

Yoshiaki Oobayashi