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公开(公告)号:US5468441A
公开(公告)日:1995-11-21
申请号:US293557
申请日:1994-08-22
IPC分类号: B29C45/00 , B29K67/00 , B29L7/00 , B29L23/00 , B29L24/00 , C08G63/52 , C08G63/54 , C08G63/676 , C08G63/78 , C08G63/80 , C08G63/88 , C08L67/06
摘要: A high-molecular-weight polyester is prepared by polycondensing an aromatic dicarboxylic acid with a mixture of alkanediols and alkenediols with substantial exclusion of oxygen and in the presence of a catalyst, until a viscosity number in the range from 50 to 140 cm.sup.3 /g is reached and then postcondensing the polycondensed material in the solid-phase until the required viscosity number is reached.
摘要翻译: 通过将芳族二羧酸与烷基二醇和烯二醇的混合物与氧气基本上排除并且在催化剂存在下,使粘度为50-140cm 3 / g的粘度数为 达到并然后使固相中的缩聚材料缩聚,直到达到所需的粘度数。