| 摘要 |
Thermoplastic resin compositions containing a rubber-reinforced thermoplastic resin (A) obtained by graft polymerizing a monomeric mixture (b) in the presence of a rubber-like polymer (a), and a copolymer (B) obtained by polymerizing an aromatic vinyl compound, a vinyl cyanide compound and optionally other copolymerizable monomeric compound(s), which copolymer (B) being a mixture of a copolymer (B1) having M<SUB>w </SUB>of 50,000 to 110,000 and a copolymer (B2) having M<SUB>w </SUB>of 115,000 to 400,000. The content of the rubber-like polymer (a) content in the rubber-reinforced thermoplastic resin (A) is 10 to 25% by weight, the vinyl cyanide monomeric unit in the acetone soluble matter is 15 to 40% by weight, and the ratios of Mw to M<SUB>n </SUB>and M<SUB>Z </SUB>to M<SUB>n </SUB>of the acetone soluble matter being 2 to 5 and 5 to 11, respectively.
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