Nippon A&l Incorporated

Shunsaku Kubota

Takayoshi Fujiwara

Hajime Tomita

Atsushi Hashimoto

Haruki Okuno

Fumitoshi Takeda

Yoshiaki Takada

Seiji Tamai

Masaaki Okada

Takumi Miyahiro

Nobuyuki Nakashima

Kazunori Takahashi

Jiichiro Yoshida

Shouta Kosaka

Masanori Ito

Tomoyoshi Akiyama

Suguru Koba

Provided is a thermoplastic resin composition having excellent weather resistance, impact resistance, and fluidity and also excellent color developing properties and residence heat stability. A graft copolymer (A) prepared by graft polymerization of a certain amount of a specific monomer ()onto a certain amount of composite rubber () composed of a conjugated diene rubber polymer and a cross-linked acrylic ester polymer. The tetrahydrofuran-soluble portion of the composite rubber () has a weight-average molecular weight of 50000 or more in terms of polystyrene and a degree of swelling in toluene of 7.0 or more, or in the composite rubber contained in the graft copolymer, the number of particles having an equivalent-circle diameter of 150 nm or less is 50% or less of the total number of the composite rubber particles.

Graft copolymer, thermoplastic resin composition, molded article, and method for producing graft copolymer

A thermoplastic resin composition for vehicle lamp housings, includes: 5 to 80 parts by weight of a graft copolymer (A) obtained by graft polymerizing at least one monomer (a-2) selected from the group consisting of aromatic vinyl-based monomers, vinyl cyanide-based monomers, and (meth)acrylic ester-based monomers and maleimide-based monomers, under the presence of an acrylic ester-based rubbery polymer (a-1) having a weight average particle size of 100 to 400 nm; and 20 to 95 parts by weight of a (co)polymer (B) in which at least one monomer (a-2) selected from the group consisting of aromatic vinyl-based monomers, vinyl cyanide-based monomers, (meth)acrylic ester-based monomers and maleimide-based monomers is polymerized, in which a content of total volatiles at 260&#xb0; C. is no more than 0.7% by weight of the composition overall, and a content of oligomer component having a weight average molecular weight of 200 to 1000 is no more than 0.3% by weight of the composition overall.

Thermoplastic resin composition for vehicle lamp housings

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Takaishi, Japan

Shunsaku Kubota