The thermoplastic resin composition of the invention includes: 10% to 70% by mass of (A) a rubber-reinforced vinyl-based resin containing a rubbery part derived from an acrylic rubbery polymer and a resin part having a structural unit derived from an aromatic vinyl compound and a structural unit derived from a cyanidated vinyl compound; 5% to 80% by mass of (B) a (meth)acrylic resin (excluding component (A)) including a (co)polymer which has a structural unit derived from an alkyl (meth)acrylate ester compound and which does not have a structural unit derived from α-methylstyrene; and 5% to 70% by mass of (C) an α-methylstyrene-based resin (excluding component (A)) containing a (co)polymer which has a structural unit derived from α-methylstyrene and which does not have a structural unit derived from an alkyl (meth)acrylate ester compound based on 100% by mass of a total content of components (A) to (C).
本发明的热塑性
树脂组合物包括10%至70%(质量百分比)的(A)橡胶增强
乙烯基树脂,其中橡胶部分来自
丙烯酸橡胶聚合物,
树脂部分的结构单元来自芳香族
乙烯基化合物和
氰化
乙烯基化合物;5%至80%(质量百分比)的(B)(甲基)
丙烯酸树脂(不包括组分(A)),包括具有来自烷基(甲基)
丙烯酸酯化合物的结构单元且不具有来自α-
甲基苯乙烯的结构单元的(共)聚合物,以及5%至70%(质量百分比)的(C)α-
甲基苯乙烯基
树脂(不包括组分(A)),其中具有来自烷基(甲基)
丙烯酸酯化合物的结构单元的(共)聚合物;按组分(A)至(C)总含量的 100%质量计算,(C)中含 5%至 70%的α-
甲基苯乙烯基
树脂 (不包括组分(A)),该α-
甲基苯乙烯基
树脂含有一种(共)聚合物,该(共)聚合物具有从 α-
甲基苯乙烯衍生的结构单元,且不具有从烷基(甲基)
丙烯酸酯化合物衍生的结构单元。