An improved interfacial polycondensation polycarbonate process, the improvement comprising an initial equilibrated pH range of 11 to 13, a temperature range of 15.degree. to 40.degree. C., a carbonyl halide rate of addition of 0.03 to 0.3 moles per minute per mole of aromatic dihydroxy compound, and a chain stopper content of 0.02 to 0.05 moles per mole of aromatic dihydroxy compound. The resulting aromatic polycarbonate exhibits improved chemical and physical properties having a weight average molecular weight within a range of from about 25,000 to 65,000, and a monocarbonate content of less than about 400 parts per million.
改进的界面聚合聚
碳酸酯工艺,改进包括初始平衡pH范围为11至13,温度范围为15°C至40°C,碳
酰卤素加入速率为每分子芳香二
酚化合物0.03至0.3摩尔/分钟,链停剂含量为每摩尔芳香二
酚化合物0.02至0.05摩尔。所得的芳香族聚
碳酸酯具有改善的
化学和物理性质,其重量平均分子量在约25,000至65,000范围内,单
碳酸酯含量小于约400 ppm。