Patent ID: 7211626

Claim:
A styrene resin composition comprising a styrene copolymer (A), and a block copolymer (B) comprising a polymer block (b1) of a styrene monomer and a polymer block (b2) of a conjugated diene monomer, wherein the styrene copolymer (A) is a copolymer of a styrene monomer (a), a butyl acrylate (b) and a methyl methacrylate (c), the block copolymer (B) has an alternative multi-layered structure comprising a layer of the polymer block (b1) and a layer of the polymer block (b2) of the diene monomer, and the styrene resin composition has, on a weight basis, 9 to 25% of structural units derived from the conjugated diene monomer, 2.8 to 9.5% of structural units derived from the butyl acrylate (b), and 1.5 to 6% of structural units derived from the methyl methacrylate (c), based on the total amount of the styrene resin composition.