Patent ID: 6809151
Filing Date: 2004-10-26
Classification: C08L

Abstract:
A thermoplastic polyester composition not comprising polycarbonate, the composition comprising, by weight:(i) a thermoplastic polyester; and (ii) an impact modifier comprising: (a) a core-shell copolymer (A); wherein the core consists of one or more polymers selected from the group consisting of isoprene homopolymers, copolymers of isoprene with at most 30 mol % of a vinyl monomer selected from the group consisting of a styrene, an alkylstyrene and an alkyl (meth)acrylate, and copolymers of alkyl (meth)acrylate with at most 30 mol % of a vinyl monomer selected from the group consisting of a styrene and an alkylstyrene; further wherein the shell consists of one or more polymers selected from the group consisting of styrene homopolymers, alkylstyrene homopolymers, methyl methacrylate homopolymers, and copolymers consisting of at least 70 mol % of a styrene, alkyl styrene or methyl methacrylate with at most 30 mol % of a vinyl acetate; (b) an ethylene copolymer (B) chosen from ethylene-unsaturated epoxide copolymers (B2) and blends thereof; wherein the (B)/(A) ratio is between 90/10 and a value greater than 40/60 for proportions of impact modifier between 2 and 18% in 98 to 82% of polyester, respectively.