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公开(公告)号：US5527875A
公开(公告)日：1996-06-18
申请号：US386268
申请日：1995-02-09
CPC分类号： C08G64/307
摘要： A process for producing an aromatic polycarbonate having a weight average molecular weight of from 7,000 to 60,000 is disclosed, comprising melt polycondensing an aromatic diol compound (e.g., bisphenol A) and a diaryl carbonate compound (e.g., diphenyl carbonate) in the presence of a combination of (a) an alkali metal compound and (b) a phosphonium hydroxide compound (e.g., tetraethylphosphonium hydroxide) as an interesterification catalyst. The aromatic polycarbonate has improved heat resistance and hue.
摘要翻译： 公开了一种重均分子量为7,000至60,000的芳族聚碳酸酯的制备方法，其包括将芳族二醇化合物（例如双酚A）和碳酸二芳基酯化合物（例如碳酸二苯酯）熔融缩聚在 （a）碱金属化合物和（b）氢氧化鏻化合物（例如氢氧化四乙基鏻）作为酯交换催化剂的组合。 芳族聚碳酸酯具有改善的耐热性和色调。
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公开(公告)号：US5578694A
公开(公告)日：1996-11-26
申请号：US526548
申请日：1995-09-12
CPC分类号： C08G64/307 , C08G64/30
摘要： A process for producing an aromatic polycarbonate is described, which comprises melt-polycondensing an aromatic diol compound with a diaryl carbonate compound in the presence of an interesterification catalyst, said interesterification catalyst comprising a quaternary phosphonium salt compound represented by formula (II): ##STR1## wherein R.sup.3, R.sup.4, R.sup.5, and R.sup.6 each independently represent an alkyl group having 1 to 12 carbon atoms, an aryl group, an aralkyl group, or a cycloalkyl group, and X.sup.l- is an anion selected from the group consisting of a carbonate ion, a phosphate ion, and a tetrahydroxyboron ion, with the letter l indicating the valency of X.
摘要翻译： 描述了一种制备芳族聚碳酸酯的方法，其包括在酯交换催化剂存在下使芳族二醇化合物与二芳基碳酸酯化合物熔融缩聚，所述酯交换催化剂包含由式（II）表示的季鏻盐化合物：
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