| 摘要 |
PURPOSE:To provide the title compsn. having a short molding cycle and excellent moldability and flexural fatigue resistance, by blending two polyether ester block copolymers having different soft and hard component contents. CONSTITUTION:Each of a lower alcohol diester of terephthalic acid, an excess of 1,4-butanediol and poly(alkylene oxide) glycol is used in two or more different amounts, and subjected to an ester exchange reaction in the presence of a catalyst. The reaction products are subjected to polycondensation. The resulting polyether ester block copolymer (A) composed of X wt% poly(alkylene oxide) glycol(a) as a soft component and (100-X)wt% polybutylene terephthalate(b) as a hard component is melt-mixed with the resulting polyether ester block copolymer (B) composed of Y wt% component (a) as a soft component and (100-Y)wt% component(b) as a hard component in such a proportion as to satisfy the relationship of the formulas.
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