Patent ID: 8367770

Claim:
A thermoplastic resin composition comprising: about 40 to about 70 parts by weight of a (meth)acrylate-vinyl aromatic-unsaturated nitrile graft copolymer comprising a double layered rubbery polymer comprising an inner core layer comprising an alkyl(meth)acrylate-vinyl aromatic copolymer and an outer core layer comprising an alkyl(meth)acrylate polymer, wherein the alkyl(meth)acrylate of the alkyl(meth)acrylate-vinyl aromatic copolymer of the inner core layer is n-butyl acrylate, n-butyl methacrylate, or a mixture thereof; and a vinyl aromatic-unsaturated nitrile copolymer shell layer grafted onto said double layered rubbery polymer; and about 30 to about 60 parts by weight of a vinyl aromatic-unsaturated nitrile copolymer, wherein said (meth)acrylate-vinyl aromatic-unsaturated nitrile graft copolymer has a graft ratio of about 30 to about 70%.