Mitsubishi Monsanto Chemical Co., Ltd.

Monsanto Kasei Company

Yuji Aoki

Makoto Watanabe

Sadao Ikuma

Hiroaki Miyazaki

Noboru Watanabe

Hiromi Tomono

Itsuo Yamamoto

Yuji Koyama

An impact resistant thermoplastic resin composition which comprises: 100 parts by weight of a resin mixture comprising from 20 to 80% by weight of a polyamide resin (A) and from 20 to 80% by weight of a graft copolymer (B) composed of from 45 to 60 parts by weight of a conjugated diene rubber and from 40 to 55 parts by weight of a monomer mixture comprising from 60 to 80% by weight of an aromatic vinyl monomer component and from 20 to 40% by weight of a vinyl cyanide monomer component (provided that the total amount of said monomer mixture is 100% by weight) wherein the average particle size of graft rubber is from 0.2 to 1.0 .mu.m, the graft ratio is from 40 to 80%, and the weight average molecular weight of a resinous component composed of said monomer components is from 220,000 to 450,000; from 0.01 to 40 parts by weight of a copolymer (C) comprising from 50 to 80% by weight of an aromatic vinyl monomer component, from 0.01 to 30% by weight of an .alpha., .beta.-unsaturated dicarboxylic anhydride monomer component, from 5 to 47% by weight of at least one monomer component selected from the group consisting of an N-substituted maleimide monomer component and a vinyl cyanide monomer component, and from 0 to 30% by weight of a methyl methacrylate monomer component (provided that the total amount of the monomer components is 100% by weight); and

Impact resistant thermoplastic resin composition

An impact resistant thermoplastic resin composition which comprises:

A heat and impact resistant thermoplastic resin composition which comprises:

Heat and impact resistant thermoplastic resin composition

Process for producing a heat resistant resin composition

Heat and impact resistant resin composition

A heat resistant resin composition comprising from 10 to 90% by weight of a copolymer A and from 90 to 10% by weight of a copolymer B, in which the copolymer A is composed of an N-aromatic maleimide monomer residue, a maleimide monomer residue, a vinyl aromatic monomer residue and, optionally other vinyl monomer residue, the total content of the N-aromatic maleimide monomer residue and the maleimide monomer residue being from 10 to 45%, the content of the N-aromatic maleimide monomer residue being greater than the content of the maleimide monomer residue, the content of the vinyl aromatic monomer residue being from 90 to 55% and the content of said other vinyl monomer residue being from 0 to 20%, and the copolymer B is composed of a vinyl cyanide monomer residue, a vinyl aromatic monomer residue and, optionally other vinyl monomer residue, the content of the vinyl cyanide monomer residue being from 20 to 55%, the content of the vinyl aromatic monomer residue being from 80 to 45% and the content of said other vinyl monomer residue being from 0 to 20%.

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Yokkaichi, Japan

Yuji Aoki