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1. 发明授权

US06740729B1 Process for producing polycarbonate 失效
标题翻译：生产聚碳酸酯的方法
公开(公告)号：US06740729B1
公开(公告)日：2004-05-25
申请号：US09674725
申请日：1998-06-06
申请人： Shuji Tanaka , Shinichi Yoshida , Tamiko Nishihira
发明人： Shuji Tanaka , Shinichi Yoshida , Tamiko Nishihira
IPC分类号： C08G6400
CPC分类号： C08G64/307 , C07C68/00 , C07C69/96
摘要： A process for preparing polycarbonate is composed of the steps of transesterifying a dialkyl oxalate and a phenolic compound to give a diaryl oxalate; decarbonylating the diaryl oxalate to give a diaryl carbonate; reacting the diaryl carbonate with a polyvalent hydroxyl compound in the presence of a catalyst containing an amine compound or an ammonium compound to give the polycarbonate, removing a phenolic by-product/amine by-product mixture; collecting the mixture; purifying the mixture so that the amount of the amine by-product in the mixture is reduced to give a phenolic by-product mixture not containing the amine by-product in an amount of more than 600 ppm; and, utilizing thus purified phenolic mixture as a whole or a part of the phenolic compound in the first step.
摘要翻译：制备聚碳酸酯的方法由将草酸二烷基酯和酚类化合物酯交换得到草酸二芳基酯的步骤组成; 使草酸二芳基酯脱碳，得到碳酸二芳基酯; 在含有胺化合物或铵化合物的催化剂存在下使碳酸二芳酯与多价羟基化合物反应，得到聚碳酸酯，除去酚类副产物/胺副产物混合物; 收集混合物; 纯化混合物，使得混合物中的副产物的量减少，得到不含胺副产物的酚类副产物混合物的量大于600ppm; 并且在第一步中利用这样纯化的酚类混合物作为整体或一部分酚类化合物。

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