Thermoplastic polyester resin composition and molded article

摘要

A molded article of an aromatic polyester block copolymer-series resin is obtained, which is excellent in hydrolysis resistance, heat resistance, and yellowing resistance. There is used a polyester based thermoplastic resin composition comprising: 100 parts by weight of a polyester block copolymer (A) which is a reaction product of a thermoplastic aromatic polyester (a) and a lactone (b) and has a terminal carboxyl group in an amount of less than 5 mg-KOH/g as an acid number; 0.05 to 5 parts by weight of a polycarbodiimide compound (B); 0. 05 to 5 parts by weight of a bifunctional or polyfunctional epoxy compound (C); 0.01 to 0.5 part by weight of a phenol-series antioxidant (D); and 0.01 to 0.5 part by weight of a sulfur-series antioxidant (E).