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1. 发明授权

US4133801A Process for the preparation of polyesters 失效
标题翻译：制备聚酯的方法
公开(公告)号：US4133801A
公开(公告)日：1979-01-09
申请号：US870703
申请日：1978-01-19
申请人： Yasuo Morimatsu , Toshio Tanaka , Nobuya Okumura , Takeshi Horiuchi
发明人： Yasuo Morimatsu , Toshio Tanaka , Nobuya Okumura , Takeshi Horiuchi
IPC分类号： C08G63/00 , C08G63/20 , C08G63/78 , C08G63/30
CPC分类号： C08G63/20
摘要： A process for the preparation of polyesters by reacting a di-lower alkyl ester of a dicarboxylic acid consisting mainly of terephthalic acid with an alkylene glycol consisting mainly of ethylene glycol or tetramethylene glycol and thereafter polycondensing an obtained di-glycol ester of the dicarboxylic acid and/or a low molecular weight condensate thereof, in the presence of (A) a lower alkyl p-formylbenzoate in an amount of about 50 - 1000 ppm, (B) a di-lower alkyl isophthalate in an amount of about 50 - 1000 ppm and (C) p-toluic acid and/or a mono-lower alkyl terephthalate in an amount of more than about 30 ppm, wherein the total amount of the compounds (A), (B) and (C) is not more than about 2000 ppm, to thereby form polyesters which have good qualities and excellent melt-forming properties.
摘要翻译：通过使主要由对苯二甲酸组成的二羧酸的二低级烷基酯与主要由乙二醇或1,4-丁二醇组成的亚烷基二醇反应，然后将所得的二羧酸的二醇酯缩聚得到二羧酸的二醇酯和（A）约50-1000ppm的对位甲酰基苯甲酸低级烷基酯的存在下，（B）约50-1000ppm的二低级烷基间苯二甲酸酯，或其低分子量缩合物和（C）对甲苯甲酸和/或大于约30ppm的对苯二甲酸单低级烷基酯，其中化合物（A），（B）和（C）的总量不大于约 2000ppm，从而形成具有良好的质量和优异的熔融形成性能的聚酯。

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