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    • 26. 发明授权
    • Method for conducting solid state polymerization of polycarbonates
    • 聚碳酸酯的固态聚合方法
    • US06248858B1
    • 2001-06-19
    • US09192350
    • 1998-11-16
    • James DayGodavarthi Satyana Varadarajan
    • James DayGodavarthi Satyana Varadarajan
    • C08G6400
    • C08G64/20C08G63/64C08G64/40
    • Polymerization of polycarbonates is performed by first enhancing the crystallinity of a precursor polycarbonate, such as an oligomer, by contact in pellet form with an alkanol in the liquid or vapor state as non-solvent, and then conducting solid state polymerization in a stream of inert gas such as nitrogen. The solid state polymerization operation includes a stage of heating at a constant temperature in the range of about 215-225° C., optionally combined with a first heating stage at a constant temperature in the range of about 180-190° C. The method is adaptable to continuous operation and produces a polycarbonate having a number average molecular weight, as determined by gel permeation chromatography relative to polystyrene, of at least 15,000.
    • 聚碳酸酯的聚合通过首先通过以颗粒形式与液体或蒸气状态的链烷醇作为非溶剂接触来提高前体聚碳酸酯如低聚物的结晶度,然后在惰性气流中进行固态聚合 气体如氮气。 固态聚合操作包括在约215-225℃的恒定温度下加热的阶段,任选地在约180-190℃的恒定温度下与第一加热阶段组合。方法 适用于连续操作,并且通过凝胶渗透色谱法相对于聚苯乙烯产生数均分子量为至少15,000的聚碳酸酯。