Umg Abs, Ltd.

Joichi Watanabe

Masahito Nakamoto

Yoshitaka Naito

Koichi Tezuka

Hiroshi Tanigawa

Shigeki Hamamoto

Hirotoshi Saito

Provided is a flame-retardant thermoplastic resin composition in which any halogenated flame retardant is not used but a phosphoric flame retardant is used, which has flame retardancy meeting U.S. UL Standard 94 V-2, which exhibits excellent dripping performance during burning, and which is excellent in balance between properties. The flame-retardant thermoplastic resin composition contains 100 parts by mass of a copolymer mixture containing a graft copolymer (A) obtained by graft-polymerizing a rubbery polymer, a vinyl cyanide compound, and a copolymerizable vinyl compound and a vinyl copolymer (B) which is obtained by copolymerizing the vinyl cyanide compound and the copolymerizable vinyl compound and which has a mass-average molecular weight of 90,000 to 160,000 and 5 to 20 parts by mass of a phosphoric flame retardant (C) blended with the copolymer mixture. The content CBof vinyl cyanide units in the acetone-insoluble fraction of the copolymer mixture is 22.0% to 32.0% by mass, the content CBof vinyl cyanide units in the acetone-soluble fraction thereof is 22.0% to 34.0% by mass, and |CB&#x2212;CB| is 0% to 3.0% by mass.

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Ube, Japan

Joichi Watanabe