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    • 10. 发明授权
    • Process for the production of polycarbonate
    • 聚碳酸酯生产工艺
    • US5696222A
    • 1997-12-09
    • US715466
    • 1996-09-18
    • Hiroaki KanekoWataru FunakoshiKatsushi Sasaki
    • Hiroaki KanekoWataru FunakoshiKatsushi Sasaki
    • C08G64/14C08G64/30C08G64/00
    • C08G64/307C08G64/14
    • A process for the production of a terminal-blocked aromatic polycarbonate by melt-polycondensing an aromatic dihydroxy compound and diphenylcarbonate, the process comprising adding a specific carbonate or carboxylic ester after a polycarbonate formed has an intrinsic viscosity of at least 0.3 dl/g, to form a terminal-blocked polycarbonate having an intrinsic viscosity which is greater than, or smaller than, the intrinsic viscosity of the polycarbonate formed before the addition by 0.1 dl/g at the most; and a process for the production of a polycarbonate having an increased intrinsic viscosity by melt-polycondensing an aromatic dihydroxy compound and diphenylcarbonate, the process comprising adding a specific diaryl carbonate or dicarboxylic diaryl ester after a polycarbonate formed has an intrinsic viscosity of at least 0.3 dl/g, to form a polycarbonate having an intrinsic viscosity greater than the intrinsic viscosity of the polycarbonate formed before the addition by more than 0.1 dl/g.
    • 通过使芳族二羟基化合物和碳酸二苯酯熔融缩聚来制备端基封闭的芳族聚碳酸酯的方法,该方法包括在形成的聚碳酸酯之后加入特定的碳酸酯或羧酸酯,其特性粘度至少为0.3dl / g,特性粘度至少为0.3dl / g, 形成特性粘度大于或小于添加前形成的聚碳酸酯的特性粘度最多为0.1dl / g的封端聚碳酸酯; 以及通过使芳族二羟基化合物和碳酸二苯酯熔融缩聚制备具有增加的特性粘度的聚碳酸酯的方法,该方法包括在形成的聚碳酸酯之后加入特定的碳酸二芳基酯或二羧酸二芳基酯,其特性粘度至少为0.3dl 以形成特性粘度大于加成前形成的聚碳酸酯的特性粘度大于0.1dl / g的聚碳酸酯。