| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve oil resistance and heat resistance by coupling polyester copolymer and polyether shown by specific formulae by an urethane coupling part shown by a specific formula, in multi-layer tubular molding having layers made of specified ester elastomer at the outside of an inner layer and an outer layer. SOLUTION: To make flexibility of multi-layer tubular molding and creep resistance property at a high temperature compatible, an ester elastomer is made of the block copolymer of a polyester copolymer in which short-chain polyester component shown by formula I is 50 to 59 wt.% and long-chain polyester component shown by formula II is 50 to 5 wt.% and a polyether shown by formula III. Polyester copolymer and polyether are coupled by an urethane coupling component shown by formula IV and are constituted of 50 to 500 pts.wt. polyether and 10 to 100 pts.wt. urethane coupling component based on 100 pts.wt. polyester copolymer. In the formulae I to IV, R1 is an aromatic hydrocarbon radical, and R2 to R5 are each an alkylene or the like.</p> |
