Polyolefin-based plastic composition and automotive molded artic

Details Polyolefin-based plastic composition and automotive molded artic Polyolefin-based plastic composition and automotive molded artic

1997-04-23

1999-10-12

Cain, Edward J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

525240, C08K 300

Patent

active

059656549

ABSTRACT:
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.

REFERENCES:
patent: 5308908 (1994-05-01), Fukui et al.
patent: 5391618 (1995-02-01), Yamamoto et al.
patent: 5599865 (1997-02-01), Koizumi et al.
"Handbook of Fillers for Plastics", ed. Katz and Milewski, pp. 222-231 (1987).
Japanese Industrial Standard, K-7210, "Testing Method for Melt Flow rate of Thermoplastics" pp.: 453-457, with English translation.
Japanese Industrial Standard, K-7203, "Testing Method for Flexural Properties of Rigid Plastic" pp.: 310-314, with English translation.
Japanese Industrial Standard, K-6758, "Testing Methods for Polypropylenes", pp.: 776-777, with English translation.
Japanese Industrial Standard, K-7110, "Method of Izod Impact Test for Rigid Plastics", pp.: 225-236, with English translation.
Japanese Industrial Standard, K-5400, "Testing Methods for Paints", pp.: 279-286, with English translation.
WPI Accession No. 96-378960 [38], & JP08183412, with abstract.
WPI Accession No. 93-164637 [20], & JP05098094, with abstract.
Derwent Report No. 96-378960/38 of JP 08-138412 (Jul. 16, 1996).

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