Thermoplastic resin composition containing graft copolymer.

摘要

A thermoplastic resin composition comprising 10 to 60 parts of a graft copolymer (A) and 90 to 40 parts of a rigid copolymer (B), both defined below: (A) The graft copolymer obtained by emulsion graft polymerizing 60 to 20 parts of a specific monomer mixture in the presence of 40 to 80 parts (as solids) of an ethylene-propylene-non-conjugated diene copolymer-containing cross-linked latex containing 0.1 to 20 parts of a modified low molecular weight alpha -olefin copolymer in 100 parts of an ethylene-propylene-non-conjugated diene copolymer. (B) The rigid copolymer containing 60 to 76% of an aromatic vinyl type monomer, 40 to 24% of a vinyl cyanide type monomer, and 0 to 30% of a monomer copolymerizable with these monomers. In the production of the graft copolymer (A), a redox type initiator and a monomer mixture are added to the polymerization system continuously over a period of one hour.