公开(公告)号：US07498400B2

公开(公告)日：2009-03-03

申请号：US11427885

申请日：2006-06-30

申请人： Bernd Jansen ,  Jan Henk Kamps ,  Edward Kung ,  Patrick Joseph McCloskey ,  Paul Michael Smigelski, Jr.

发明人： Bernd Jansen ,  Jan Henk Kamps ,  Edward Kung ,  Patrick Joseph McCloskey ,  Paul Michael Smigelski, Jr.

IPC分类号： C08G64/00 ,  C08G63/02

CPC分类号： C08G64/14 ,  C08G64/307

摘要： Polycarbonates incorporating terminal carbonate groups derived from ester-substituted activated carbonates 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 by reacting a dihydroxy compound with an activated diaryl carbonate in the presence of an esterification catalyst to produce a polycarbonate, in the presence of a monohydroxy chainstopper such as para-cumyl phenol in an amount that results in 35 to 65 mol % of the end groups being derived from the monohydroxy chainstopper. Suitably, the reactants are provided such that the molar ratio of activated diaryl carbonate to the total of dihydroxy compound plus ½ the chainstopping reagent that is less than 1.

摘要翻译： 在酯交换方法中，衍生自酯取代的活性碳酸酯的末端碳酸酯基团的聚碳酸酯在颜色，水解稳定性和热稳定性方面具有不利的性质，特别是当含有这样的端基的聚碳酸酯被成型时。 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通过在酯化催化剂的存在下使二羟基化合物与活化的碳酸二芳基酯反应来制备聚碳酸酯，在单羟基链断裂剂例如对 - 辛基苯酚，其量导致35-65mol％端基衍生自单羟基链断裂剂。 适当地，提供反应物使得活化的碳酸二芳基酯与二羟基化合物的总和加上1/2的阻滞剂的摩尔比小于1。