Takayuki Nagai

US Patent:

6667359, Dec 23, 2003

Filed:

Jun 23, 2000

Appl. No.:

09/599884

Inventors:

Masaru Nakagawa - Chiba, JP
Koki Hirano - Ichihara, JP
Yutaka Obata - Ichihara, JP
Yasuhisa Sugita - Ichihara, JP
Takao Nomura - Toyota, JP
Masatoshi Matsuda - Toyota, JP
Hisayuki Iwai - Aichi-ken, JP
Takayuki Nagai - Ann Arbor MI

Assignee:

Idemitsu Petrochemical Co., Ltd. - Tokyo
Toyota Jidosha Kabushiki Kaisha - Toyota

International Classification:

C08K 334

US Classification:

524451, 524505, 525240, 525241, 525242

Abstract:

There are disclosed a polypropylene composition for automotive parts which has a melt index at 230Â C. and at 2. 16 kgf of at least 30 g/10 minutes and which comprises 55 to 60% by weight of (1) propylene/ethylene block copolymer; 20 to 25% by weight of (2) rubber comprising a styrene/ethylene/propylene/styrene block copolymer and/or a styrene/ethylene/1-butene/styrene block copolymer and an olefinic elastomer; and 18 to 23% by weight of (3) talc, and also an automotive part which comprises the above polypropylene composition.

US Patent:

6759465, Jul 6, 2004

Filed:

Dec 22, 2000

Appl. No.:

09/720343

Inventors:

Moriyasu Shimojo - Ichihara, JP
Kenichi Ohkawa - Ichihara, JP
Susumu Kanzaki - Kisarazu, JP
Takayuki Nagai - Ann Arbor MI
Takao Nomura - Toyota, JP
Masatoshi Matsuda - Toyota, JP
Hisayuki Iwai - Aichi-ken, JP

Assignee:

Sumitomo Chemical Company, Limited - Osaka
Toyota Jidosha Kabushiki Kaisha - Toyota

International Classification:

C08K 334

US Classification:

524451, 525 88, 525 95, 525240, 525242

Abstract:

A thermoplastic composition which is obtained by melt-kneading (1) 55 to 75 wt. % crystalline polypropylene resin together with (2) 10 to 30 wt. % elastomer comprising either a rubber containing a vinyl aromatic compound or a mixture thereof with an ethylene/-olefin random copolymer rubber and (3) 15 to 25 wt. % talc having an average particle diameter of 3 m or smaller. The composition satisfies specific requirements with respect to: the long period obtained by X-ray small-angle scattering attributable to the vinyl aromatic-containing rubber in a blend obtained by melt-kneading the ingredients (1) and (2); the shape and diameter of the elastomer particles present near the polypropylene/elastomer interface in the blend; and the difference between the glass transition point of the ingredient (1) and that of the composition attributable to the crystalline polypropylene homopolymer parts. The composition has a satisfactory balance between impact resistance and rigidity and has excellent injection moldability.