Sumitomo Chemical Company, Limited

Jun Satoh

Takashi Sanada

Tsuyoshi Watanabe

Hiroyuki Tanimura

Katsuyuki Imigi

Disclosed is a method for producing a propylene-based resin composition comprising: a first step of producing a first resin composition (MB) by melt-kneading a first-propylene polymer (A-I) and a fibrous inorganic filler (B) in a weight ratio of (A-I) to (B) of from 3/7 to 7/3; and a second step of producing a second resin composition by adding a second propylene polymer (A-II), a non-fibrous inorganic filler (C) and an elastomer (D) selected from the group consisting of olefin-based elastomer and vinyl aromatic compound-containing elastomer to the first resin composition (MB), followed by melt-kneading them.

Method for producing a propylene-based resin composition, a propylene-based resin composition, and an injection molded article

A polypropylene resin composition having a melt flow rate of 70 to 120 g/10 min (at 230&#xb0; C., 2.16 kgf-load), a flexural modulus of 1300 to 4000 MPa and an IZOD impact strength of 30 to 100 kJ/m, wherein the composition is obtained by adding a small amount of an organic peroxide to a mixture comprising 60 to 80% by weight of a specific propylene-ethylene block copolymer made up of a propylene homopolymer portion and a propylene-ethylene random copolymer portion, a rubber which is a copolymer of ethylene and at least one &#x3b1;-olefin having a melt flow rate of 2 to 10 g/10 min (at 190&#xb0; C., 2.16 kgf-load), and inorganic filler (C), and kneading the combined ingredients at a temperature of 170 to 280&#xb0; C.

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Chiba, Japan

Jun Satoh