IMPROVED PROCESS FOR PRODUCING AROMATIC POLYCARBONATE

摘要

A practical process in which an aromatic polycarbonate of high quality and high performance excelling in mechanical properties and being free from any tinting can be stably produced in an industrial scale of 1 to 50 tons per hour for a prolonged period of time from a molten prepolymer of aromatic polycarbonate obtained from an aromatic dihydroxy compound and a diaryl carbonate. In particular, there is provided a process for producing an aromatic polycarbonate on an industrial scale according to a melt method, comprising polymerizing a molten prepolymer of aromatic polycarbonate obtained by reaction of an aromatic dihydroxy compound with a diaryl carbonate by means of a guided contact fall type polymerizer of specified structure, so that an aromatic polycarbonate of high quality and high performance excelling in mechanical properties and being free from any tinting can be produced stably without any fluctuation of molecular weight or the like in an output rate of 1 to 50 tons per hour for a prolonged period of time of >= 1000s, for example, >= 5000 hr.