Nissan Motor Company Limited

Nihon Plast Co., Ltd.

Japan Polychem Corporation

Takuya Kurio

Masahiro Terada

Akira Kawai

Kazuyuki Yamamoto

Satoru Ichikawa

Yukihito Zanka

Motoru Komatsu

Kazuo Matsuyama

Hirosuke Kamae

Kazushige Ohnishi

Tomio Hirata

Takashi Niimi

A polyolefin-based plastic composition suitable for an automotive molded pillar member such as a pillar garnish. The plastic composition comprises (A) block copolymer in an amount ranging from 53 to 68 parts by weight, the block copolymer having a Melt Flow Rate (at 230.degree. C. and under 2.16 kg) ranging from 20 to 50 g/10 min. and containing crystalline polypropylene section in an amount ranging from 90 to 95% by weight, having a density of not lower than 0.908 g/cm.sup.3, and propylene-ethylene random copolymer section in an amount ranging from 5 to 10% by weight, the propylene-ethylene random copolymer section having an ethylene content ranging from 35 to 45% by weight; (B) ethylene-1-butene copolymer rubber in an amount ranging from 12 to 20 parts by weight and having a density ranging from 0.85 to 0.87 g/cm.sup.3 and a Melt Flow Rate (at 230.degree. C. and under 2.16 kg) ranging from 0.2 to 5 g/10 min., the copolymer rubber containing 1-butene in an amount ranging from 30 to 40% by weight; and (C) talc in an amount ranging from 22 to 30 parts by weight and having a length not more than 15 .mu.m and an average particle size ranging from 1.5 to 6 .mu.m, the talc having an average aspect ratio not lower than 5. The polyolefin-based plastic composition has a Melt Flow Rate (at 230.degree. C. and under 2.16 kg) not lower than 8 g/10 min., a Flexural Elastic Modulus not lower than 1960 MPa when molded, and an IZOD not lower than 0.088 KJ/m when molded, and a Rockwell hardness (in R scale) not lower than 65 when molded.

Polyolefin-based plastic composition and automotive molded article

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Mie, Japan

Takuya Kurio