Patent ID: 8383726

Claim:
A thermoplastic resin composition comprising 90 to 99% by mass of a thermoplastic resin and 1 to 10% by mass of an impact resistance improver which is a graft copolymer to be obtained by polymerizing a vinyl monomer component (b) comprising an aromatic vinyl monomer (b1) and an alkyl(meth)acrylate monomer (b2) in the presence of a polymer mixture (A) comprising a polymer (A1) having butadiene units as a major component and a polymer (A2) having styrene units as a major component, wherein a content of the butadiene units in the polymer mixture (A) is 45 to 65% by mass, a content of the styrene units in the polymer mixture (A) is 35 to 55% by mass, the thermoplastic resin is an aromatic polycarbonate, the polymer mixture (A) is obtained by mixing a latex of the polymer (A1) having butadiene units as a major component and a monomer component having styrene as a major component, impregnating the polymer (A1) with the monomer component having styrene as a major component, and polymerizing the monomer component having styrene as a major component, the quantity of 1,3-butadiene in 100% by mass of the monomers to be used for polymerization of the polymer (A1) is 60% by mass or more, and the quantity of styrene in 100% by mass of the monomers to be used for polymerization of the polymer (A2) is 80% by mass or more.