POLYESTER BLOCK COPOLYMER

摘要

PROBLEM TO BE SOLVED: To provide a polyester composition capable of forming a molded article having superior mechanical strength and a suppressed stick-slip effect under whatever server conditions such as in an atmosphere of high temperatures, and further to provide a flexible boot for a universal coupling comprising the above polyester composition which does not generate abnormal sliding sound caused by stick-slip for an extensive period under whatever severe conditions such as in an atmosphere at high temperatures. SOLUTION: The polyester block copolymer is prepared by mixing a polyester block copolymer with a fatty acid amide compound and introducing a compound into the polyester block copolymer as a specific repeating unit. The flexible boot for a universal coupling is manufactured by using the above polyester block copolymer composition.