Patent ID: 7351766

Claim:
A thermoplastic resin composition, which is obtained by: graft polymerizing a monomer in the presence of a non-crosslinked polymer A to obtain a non-crosslinked polymer B; said polymer (B) being a graft copolymer comprising units of said polymer A and polymerized units of said monomer; and wherein a weight average molecular weight of a soluble component of said thermoplastic resin composition that dissolves in chloroform is 10,000 to 100,000; wherein said polymer (A) is incompatible with polycarbonate resin and is a polymer in which surface layer separation is observed by a tape peeling test according to JIS-K5400 by producing a molded test piece using an injection molding machine after melting and kneading at 270° C. in a double screw extruder 10% by mass of polymer (A) and 90% by mass (total: 100% by mass) of polycarbonate resin having a viscosity average molecular weight of 17,000 to 25,000; wherein said polymer (B) has compatibility with or affinity for polycarbonate resin and is a polymer in which surface layer separation is not observed by said tape peeling test using 10% by mass of polymer (B) and 90% by mass (total: 100% by mass) of polycarbonate resin having a viscosity average molecular weight of 17,000 to 25,000; wherein the polymer (A) is a polymer (A-1) having for its main component a polyalkyl acrylate having a glass transition temperature of 25° C. or lower, or a polymer (A-2) having for its main component polyorganosiloxane; and wherein the polymer (B) is a polymer selected from the group consisting of i) a polymer (B-1) having for its main component a homopolymer or copolymer of at least one alkyl(meth)acrylate and having a glass transition temperature that exceeds 25° C., ii) a polymer (B-2) having for its main component a copolymer of an aromatic alkenyl compound and a vinyl cyanide compound, and iii) a polymer (B-3) having for its main component a copolymer of an alkyl(meth)acrylate and a vinyl cyanide compound or an aromatic alkenyl compound.