Patent ID: 8735490

Claim:
An aromatic vinyl based thermoplastic resin composition comprising: (A) about 10 to about 99% by weight of a thermoplastic resin including (a1) an aromatic copolymer resin; (a2) a rubber-modified vinyl graft copolymer; or a combination of (a1) and (a2); and (B) about 1 to about 90% by weight of a branched aromatic vinyl copolymer resin including a silicon based compound, wherein (B) the branched aromatic vinyl copolymer resin including a silicon based compound is a copolymer or a combination of copolymers prepared by copolymerizing: (b1) about 10 to about 85% by weight of an aromatic vinyl based monomer; (b2) about 10 to about 85% by weight of an unsaturated nitrile based monomer; (b3) about 1 to about 50% by weight of a (meth)acrylic monomer, wherein (b3) the (meth)acrylic monomer comprises an aromatic methacrylate, aliphatic methacrylate, or a combination thereof having a structure represented by Formula 1, Formula 2, or a combination thereof below or a combination of (meth)acrylic monomers copolymerizable with an aromatic methacrylate, aliphatic methacrylate, or a combination thereof having a structure represented by Formula 1, Formula 2, or a combination thereof below: wherein m is an integer from 0 to 20, X is hydrogen or methyl, Y is methyl, cyclohexyl, phenyl, benzyl, methylphenyl, methylethylphenyl, methoxyphenyl, cyclohexylphenyl, chlorophenyl, bromophenyl, phenylphenyl, or benzyl phenyl, wherein m is an integer from 0 to 20, X is hydrogen or methyl, Z is oxygen (O) or sulfur (S), and Ar is methyl, cyclohexyl, phenyl, benzyl, methylphenyl, methylethylphenyl, methoxyphenyl, cyclohexylphenyl, chlorophenyl, bromophenyl, phenylphenyl, or benzyl phenyl; and (b4) about 0.1 to about 20% by weight of a silicon based compound having two or more unsaturated functional groups, wherein the vinyl content of (b4) the silicon based compound having two or more unsaturated functional groups is about 0.05 to about 10 mmol/g.