| 摘要 |
PROBLEM TO BE SOLVED: To provide a resin-made flexible boot to be mounted on a universal joint and from which abnormal slide sound is not generated even if the universal joint is bent and rotated at high angles. SOLUTION: A polyester block copolymer composition formed by mixing one or two kinds of alkylene asymmetric bis-fatty acid amide compound B expressed by a constitutional formula to a polyester block copolymer is formed by using a polyester block copolymer composition in which the mixing amount of alkylene asymmetric bis-fatty acid amide component B is 0.01 to 0.5 pts.wt. to 100 pts.wt. of a polyester block copolymer A. (in the formula, R1, R2 express each a saturated aliphatic hydrocarbon group, an unsaturated aliphatic hydrocarbon group, an alicyclic hydrocarbon group or an aromatic hydrocarbon group, R1 and R2 are different from each other, and R expresses a hydrocarbon group obtained by removing one hydrogen from the group).
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