申请人:MITSUI TOATSU CHEMICALS, Inc.
公开号:EP0600447A2
公开(公告)日:1994-06-08
A method for preparing an aromatic polycarbonate having less content of a low molecular weight oligomer which comprises the steps of :
(A) conducting an interfacial polymerization reaction in a reaction system comprising at least one aromatic dihydroxy compound, a carbonate precursor, an alkali metal or alkaline earth metal base, water and an organic solvent in the absence of an endcapping agent, and
(B) conducting an interfacial polymerization reaction with the addition of an endcapping agent after at least one of the following parameters reaches a predetermined value :
(1) a weight-average molecular weight of a prepolymer obtained in step A,
(2) a residual amount of the aromatic dihydroxy compound which is contained in the reaction mixture obtained in step A,
(3) an amount ratio of a bishaloformate compound to a prepolymer wherein the bishaloformate compound is a bishaloformate derivative of a dihydroxy compound and is contained in the reaction mixture obtained in step A.
一种制备低分子量低聚物含量较少的芳香族聚碳酸酯的方法,包括以下步骤: :
(A) 在反应体系中进行界面聚合反应,该反应体系包括至少一种芳香族二羟基化 合物、碳酸盐前体、碱金属或碱土金属碱、水和有机溶剂,在没有封端剂的情 况下,以及
(B) 在下列参数中的至少一个参数达到预定值后,加入终结封端剂进行界面聚合反应:
(1) 在步骤 A 中获得的预聚物的重量平均分子量、
(2) 在步骤 A 中得到的反应混合物中含有的芳香族二羟基化合物的残留量、
(3) 双羟烷基甲酸酯化合物与预聚物的量比,其中双羟烷基甲酸酯化合物是二羟基化合物的双羟烷基甲酸酯衍生物,包含在步骤 A 中得到的反应混合物中。