申请人:SHELL INTERNATIONALE RESEARCH
MAATSCHAPPIJ B.V.
公开号:EP0277907A2
公开(公告)日:1988-08-10
Condensation polymers of high molecular weight, such as polyesters, polyureas, and polyamides, are usually prepared at temperatures of 200°C or greater. However, by utilizing the catalyst systems of the present invention, condensation polymers can be synthesized at much lower temperatures. The polycondensation catalyst systems of the present invention are particularly useful for synthesizing aliphatic polyesters, such as polyethylene terephthalate, from dicarboxylic acids and aliphatic glycols. The present invention more specifically discloses a process for the synthesis of an aliphatic polyester comprising polymerizing at least one dicarboxylic acid with at least one aliphatic glycol in the presence of (1) at least one phosphorus containing compound which contains at least one trivalent or pentavalent phosphorus atom which is bonded directly to at least one phenyl group, (2) an acid acceptor, and (3) at least one halogenated organic compound. It is preferred to utilize a polymeric agent having bound acid acceptor groups as the acid acceptor in the process of the present invention.
高分子量缩聚聚合物,如聚酯、聚脲和聚酰胺,通常在 200°C 或更高温度下制备。然而,利用本发明的催化剂体系,缩聚聚合物可以在更低的温度下合成。本发明的缩聚催化剂体系尤其适用于从二羧酸和脂肪族乙二醇合成脂肪族聚酯,如聚对苯二甲酸乙二醇酯。本发明更具体地公开了一种合成脂肪族聚酯的工艺,该工艺包括至少一种二羧酸与至少一种脂肪族乙二醇在(1)至少一种含磷化合物(该化合物含有至少一个直接与至少一个苯基键合的三价或五价磷)、(2)一种酸接受体和(3)至少一种卤代有机化合物存在下进行聚合。在本发明的工艺中,最好使用具有结合的酸受体基团的聚合剂作为酸受体。