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    • 4. 发明授权
    • Copolyetherester based on poly (propylene oxide) glycol blocked with
ethylene oxide
    • 基于用环氧乙烷封端的聚(环氧丙烷)二醇的共聚醚酯
    • US4687835A
    • 1987-08-18
    • US863787
    • 1986-05-16
    • Jacobus J. ZeilstraTed Brink
    • Jacobus J. ZeilstraTed Brink
    • C08G63/00C08G63/66
    • C08G63/66
    • A copolyetherester comprising a random head-to-tail copolymer of 25-55 percent by weight of short-chain ester units; at least 75 mole percent is composed of 1,4-butylene terephthalate units, and long-chain ester units derived from ethylene oxide-capped poly(propylene oxide) glycol having an ethylene oxide content of from 15-35 percent by weight and a number average molecular weight ranging from 1500-2800. The copolyetherester displays improved physical properties, such as a higher elongation at rupture, notched tensile impact energy and tearing energy, if its relative viscosity (1 g of polymer in 100 g m-cresol at 25.degree. C.) is in the range of 2,45 to 5,0 and the melt index MFI is between ##EQU1## It may be prepared by melt condensation of a copolyetherester having a relative viscosity of 1,8 to 2,5 and subsequently subjecting it to post-condensation in the solid phase for a sufficient period to obtain a polymer corresponding to said viscosity and melt index.
    • 一种共聚醚酯,其包含25-55重量%的短链酯单元的随机头 - 尾共聚物; 至少75摩尔%由1,4-对苯二甲酸丁二醇酯单元组成,并且衍生自环氧乙烷封端的聚(环氧丙烷)二醇的长链酯单元,其环氧乙烷含量为15-35重量%,数量为 平均分子量范围从1500-2800。 共聚醚酯显示出改善的物理性能,如破裂时的较高伸长率,切口拉伸冲击能量和撕裂能量,如果其相对粘度(在25℃下在100g间甲酚中的1g聚合物)处于2 ,45至5.0,并且熔体指数MFI在之间。它可以通过相对粘度为1,8至2.5的共聚醚酯的熔融缩合制备,并随后对其进行后冷凝 在固相中足够的时间以获得对应于所述粘度和熔融指数的聚合物。