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    • 9. 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。
    • 10. 发明授权
    • Stabilized aromatic polycarbonate
    • 稳定的芳族聚碳酸酯
    • US06303734B1
    • 2001-10-16
    • US09424151
    • 1999-11-19
    • Wataru FunakoshiHiroaki KanekoKatsushi Sasaki
    • Wataru FunakoshiHiroaki KanekoKatsushi Sasaki
    • C08G6400
    • C08G64/06C08G64/14C08G64/307
    • The relative intensity of fluorescent light of a melt-polycondensed aromatic polycarbonate produced by the transesterification process (melt polymerization process) of an aromatic dihydroxy compound and a carbonic acid diester in the presence of a catalyst comprising a basic nitrogen compound and/or a basic phosphorus compound in combination with an alkali metal compound is suppressed to 4.0×10−3 or below at a wavelength of 465 nm based on a standard substance in a fluorescent light spectrum obtained by the excitation wavelength of 320 nm. An aromatic polycarbonate having good color stability, especially good stability to the deterioration of the chip color during storage of the chip in air at room temperature can be produced by the present invention.
    • 在包含碱性氮化合物和/或碱性磷的催化剂存在下,通过芳族二羟基化合物和碳酸二酯的酯交换方法(熔融聚合方法)制备的熔融缩聚芳族聚碳酸酯的荧光的相对强度 与碱金属化合物组合的化合物在波长为465nm的基础上,通过激发波长320nm得到的荧光光谱中的标准物质抑制在4.0×10 -3以下。 通过本发明,可以制造具有良好的颜色稳定性的芳香族聚碳酸酯,特别是在芯片在室温下在空气中储存期间芯片颜色劣化的良好的稳定性。