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    • 7. 发明授权
    • Polycarbonates and method of preparing same
    • 聚碳酸酯及其制备方法
    • US07482423B2
    • 2009-01-27
    • US11427861
    • 2006-06-30
    • Bernd JansenJan Henk KampsEdward KungPatrick Joseph McCloskeyPaul Michael Smigelski, Jr.
    • Bernd JansenJan Henk KampsEdward KungPatrick Joseph McCloskeyPaul Michael Smigelski, Jr.
    • C08G64/00C08G63/02
    • C08G64/307C08G64/04
    • Polycarbonates incorporating terminal carbonate groups derived from ester-substituted activated carbonates, for example terminal methyl salicyl carbonate (TMSC) derived from the use of BMSC as the activated carbonate in a transesterification process, have unfavorable properties with respect to color, hydrolytic stability and thermal stability, particularly when the polycarbonate containing such end groups is molded. The number of activated carbonate end groups formed during the melt transesterification formation of polycarbonate can be reduced, however, without sacrificing the benefits of using an activated diaryl carbonate, and without requiring a separate reaction or additional additives by reacting a dihydroxy compound with an activated diaryl carbonate in the presence of an esterification catalyst to produce a polycarbonate, wherein the molar ratio of activated diaryl carbonate to dihydroxy compound is less than 1 when expressed to at least three decimal places, for example 0.996 or less.
    • 由酯取代的活性碳酸酯衍生的末端碳酸酯基团的聚碳酸酯,例如在酯交换法中使用BMSC作为活性碳酸酯的末端甲基水杨酸碳酸酯(TMSC)在颜色,水解稳定性和热稳定性方面具有不利的性质 特别是当含有这种端基的聚碳酸酯被模制时。 然而,在聚碳酸酯的熔融酯交换形成期间形成的活化碳酸酯端基的数量可以降低,但不会牺牲使用活性碳酸二芳基酯的优点,并且不需要单独的反应或另外的添加剂,通过使二羟基化合物与活化的二芳基 在酯化催化剂存在下制备碳酸酯以制备聚碳酸酯,其中活化的碳酸二芳酯与二羟基化合物的摩尔比当表示至少三位小数,例如0.996或更小时小于1。