| abstract |
(57) [Problem] To provide a polyester elastomer composition which improves hydrolysis resistance of a polyester elastomer, and is excellent in heat resistance, oil resistance, abrasion resistance and impact resistance. SOLUTION: The hard segment (A) is a polyester mainly composed of polyalkylene naphthalate having a melting point of 220 to 320 ° C, and the soft segment (B) is an aliphatic polyester having an average block chain length of 1,000 to 5,000. And a method for producing the same |