Sumitomo Chemical Company, Limited

Takashi Fujimoto

Hiroyoshi Nakajima

Yoshitaka Kobayashi

Makoto Nagata

Masaaki Tsutsubuchi

Tsuyoshi Moriguchi

A polypropylene resin composition is disclosed which contains a propylene polymer (A) selected from the group consisting of propylene homopolymers (A-1) and propylene-ethylene block copolymers (A-2) which are propylene-ethylene block copolymers each of which is composed of a propylene homopolymer component and a propylene-ethylene random copolymer component and has an intrinsic viscosity of from 2 to 8 dl/g, an ethylene-&#x3b1;-olefin copolymer (B) defined below, the amount of the polymer (A) and the amount of the copolymer (B) each being based on the combined amount of the polymer (A) and the copolymer (B) which is an ethylene-&#x3b1;-olefin copolymer having a melt index, as measured at 190&#xb0; C., of from 1 to 40 g/10 min, and a petroleum resin (C-1) or a terpene resin (C-2) having a glass transition temperature of 90&#xb0; C. or lower.

Polypropylene resin composition and molded article comprising the same

There is provided a polypropylene resin composition comprising a propylene polymer (A) containing 0 to 70% by mass of a propylene homopolymer (A-1) and 30 to 100% by mass of a propylene-ethylene block copolymer (A-2) defined below, an ethylene-&#x3b1;-olefin copolymer (B) defined below, and an inorganic filler (C), wherein the proportion of the amount of the (A), the proportion of the amount of (B), and the proportion of the amount of (C) relative to the total amount of the (A), the (B) and the (C) are 40 to 94% by mass, 5 to 30% by mass, and 1 to 30% by mass, respectively, the propylene-ethylene block copolymer (A-2) is a mixture of a propylene homopolymer component and a propylene-ethylene random copolymer component, wherein the intrinsic viscosity, as measured in Tetralin of 135&#xb0; C., of the propylene-ethylene random copolymer component is within the range of 2.0 to 8.0 dl/g, the ethylene-&#x3b1;-olefin copolymer (B) is a copolymer of ethylene and an &#x3b1;-olefin having 4 to 20 carbon atoms, the copolymer having a density of 0.85 to 0.89 g/cmand a melt flow rate, as measured at 190&#xb0; C. under a 2.16 kg load in accordance with JIS K7210, of more than 10 g/10 min and not more than 40 g/10 min.

Polypropylene resin composition, method for producing the same, and foam molded article

Disclosed is a thermoplastic resin foamed article, wherein the foamed article has two opposite surfaces, wherein the foamed article has at least a skin layer which defines one of the opposite surfaces and has a porosity of 0% or more but less than 1%, a lower-expansion layer which has a porosity of not less than 1% but less than 40% and is arranged so as to be adjacent to the skin layer, and a higher-expansion layer which has a porosity of not less than 40% but less than 100% and is arranged so as to be adjacent to the lower-expansion layer, wherein the skin layer, the lower-expansion layer and the higher-expansion layer are made of the same thermoplastic resin.

Thermoplastic resin foamed article

Disclosed is a method for manufacturing an injection-molded foamed article, the method comprising the steps of:

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Sodegaura, Japan

Takashi Fujimoto