Sumitomo Chemical Company, Limited

Toyota Jidosha Kabushiki Kaisha

Haruyuki Suzuki

Hajime Sadatoshi

Seiji Shiromoto

Takao Nomura

Takeyoshi Nishio

Tatsuhiro Nagamatsu

Yuichi Miyake

Akinobu Sakamoto

Container comprising foamed olefin resin and process for producing same

Propylene based resin composition

A thermoplastic resin composition including at least (1) a heat-treated composition obtained by heat-treating dynamically a specific polypropylene and an olefin copolymer rubber in the presence of an organic peroxide and a crosslinking agent and (2) a specified polypropylene. In addition, an inorganic filler can be added to the thermoplastic resin composition. These compositions are superior in mechanical properties such as flexural modulus, thermal rigidity resistance and impact resistance, and can be suitably used as materials for home electric parts and the like.

Thermoplastic resin composition

A thermoplastic resin composition with improved low-temperature impact strength and rigidity against heat, comprising (I) 10-40% by weight of a mixture of (a) 10-50% by weight of a propylene homopolymer and/or an ethylene-propylene block copolymer (an isotactic pentad fraction of a propylene homopolymer portion being 0.98 or above) and (b) 50-90% by weight of an olefin-based copolymer rubber, said mixture having been dynamically heat treated in the presence of an organic peroxide and a crosslinking agent, (II) 20-85% by weight of a propylene homopolymer and/or an ethylene-propylene block copolymer (an isotactic pentad fraction of a propylene homopolymer portion being 0.98 or above and a melt index of the propylene homopolymer portion being 30-150 g/10 min), and (III) 5-40% by weight of an inorganic filler.

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Chiba, Japan

Haruyuki Suzuki