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    • 67. 发明授权
    • Polyester polycondensation with catalyst and a catalyst enhancer
    • 与催化剂和催化剂增强剂的聚酯缩聚
    • US06372879B1
    • 2002-04-16
    • US09895990
    • 2001-06-29
    • Conor M. DowlingBin ChenSri R. Seshadri
    • Conor M. DowlingBin ChenSri R. Seshadri
    • C08G6302
    • C08G63/85B01J21/063B01J31/04B01J31/2239B01J31/26B01J2531/0205B01J2531/10B01J2531/20B01J2531/46B01J2531/52C08G63/82C08G63/83C08G63/84C08G63/87
    • The present invention is based upon the discovery that nontitanyl oxalates can enhance the catalytic functionality of titanyl oxalate catalysts. This invention provides a novel catalytic composition containing a titanyl oxalate catalyst and a metallic oxalate catalyst enhancer and optionally containing a metallic cocatalyst such as an antimony based catalyst. A synergistic relationship has been discovered between titanyl oxalate catalyst and the catalyst enhancer. A synergistic relationship has also been discovered between the titanyl oxalate catalyst, catalyst enhancer and a metallic cocatalyst such as antimony oxide or antimony triacetate. Also provided is an improved process of producing polyester by the polycondensation of polyester forming reactants in the presence of a catalytically effective amount of a polycondensation catalyst, wherein the improvement comprises utilizing, as the polycondensation catalyst, the novel catalyst composition containing a titanyl oxalate such as lithium titanyl oxalate and a catalyst enhancer such as a nontitanyl metallic oxalate like lithium oxalate and optionally containing a metallic catalyst such as antimony oxide or antimony triacetate. The improved process produces an improved polyester having lower acetaldehyde numbers and good color. The titanyl oxalate/catalyst enhancer composition can be used as a polycondensation catalyst in combination with other catalysts to achieve synergistic catalytic activity. Preferred is a combination of lithium or potassium titanyl oxalate, Li2 or K2TiO(C2O4)2, lithium or potassium oxalate, Li2 or K2(C2O4)2 with antimony oxide or antimony triacetate or antimony trisglycoxide.
    • 本发明基于以下发现,即草酸钛酸酯可以增强草酸氧钛催化剂的催化功能。 本发明提供一种含有草酸氧钛催化剂和金属草酸盐催化剂增强剂并任选地含有金属助催化剂如锑基催化剂的新型催化组合物。 在草酸氧钛催化剂和催化剂增强剂之间已经发现协同关系。 在草酸氧钛催化剂,催化剂增强剂和金属助催化剂如氧化锑或三乙酸锑之间也发现了协同关系。 还提供了通过在催化有效量的缩聚催化剂存在下,通过聚酯形成反应物的缩聚来生产聚酯的改进方法,其中改进包括利用含有草酸氧钛的新型催化剂组合物作为缩聚催化剂, 草酸氧钛酸锂和催化剂增强剂如非钛酸金属草酸盐如草酸锂,并任选地含有金属催化剂如氧化锑或三乙酸锑。 改进的方法产生具有较低乙醛数和良好颜色的改进的聚酯。 草酸氧钛/催化剂增强剂组合物可以与其它催化剂组合用作缩聚催化剂以实现协同催化活性。 优选的是草酸锂或钾钛酸盐,Li 2或K 2 TiO(C 2 O 4)2,草酸锂或钾,Li 2或K 2(C 2 O 4)2与氧化锑或三乙酸锑或三羟基氧化锑的组合。