Monsanto Kasei Company

Sankyo Company, Limited

Mitsubishi Monsanto Chemical Co., Ltd.

Hiromi Tomono

Tomoyuki Kurumada

Toshimasa Toda

Yuji Aoki

Sadao Ikuma

Takashi Kokubo

Hisayu Osawa

Yuji Koyama

Ryuichi Hasegawa

Kazuki Yamaguchi

Itsuo Yamamoto

The present invention relates to weather resistant resin compositions consisting essentially of at least one polymeric substance and comprising discoloration effective amounts of:

Resistant resin compositions

A heat and impact resistant thermoplastic resin composition which comprises:

Heat and impact resistant thermoplastic resin composition

A heat and impact resistant resin composition which comprises from 10 to 90 parts by weight of a copolymer (A) comprising from 90 to 50% of residues of a vinyl aromatic compound, from 10 to 50% of residues of a maleimide compound and from 0 to 30% of residues of a vinyl compound copolymerizable therewith; from 0 to 50 parts by weight a copolymer (B) comprising from 90 to 40% of residues of a vinyl aromatic compound and from 10 to 60% of residues of an unsaturated nitrile compound; from 5 to 89 parts by weight of a graft copolymer (C) comprising from 25 to 70% by weight of particles of a rubber having a glass transition temperature of not higher than 0.degree. C. and an average particle size of from 0.1 to 0.5 .mu.m and from 75 to 30% by weight of a matrix resin comprising from 90 to 40% of residues of a vinyl aromatic compound and from 10 to 60% of residues of an unsaturated nitrile compound; and from 1 to 45 parts by weight of a graft copolymer (D) comprising from 2 to 17% by weight of particles of a rubber having a glass transition temperature of not higher than 0.degree. C. and an average particle size of from 0.7 to 4 .mu.m and from 98 to 83% by weight of a matrix resin comprising from 90 to 40% of residues of a vinyl aromatic compound and from 10 to 60% of residues of an unsaturated nitrile compound, wherein the amount of the graft copolymer (C) is from 97 to 50% by weight of the total amounts of the graft copolymers (C) and (D).

Heat and impact resistant resin composition

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Yokkaichi, Japan

Hiromi Tomono