PROCESS FOR PRODUCING POLYCARBONATE

摘要

PROBLEM TO BE SOLVED: To provide a process for producing a stable polycarbonate with a controlled molecular weight. SOLUTION: In the process for producing a polycarbonate by subjecting a carbonic diester and a dihydroxy compound to melt polymerization in the presence of an alkali metal and/or alkaline earth metal catalyst, a laser liquid level meter is used for the control of the liquid level of a reaction mixture having a viscosity of 30 Pa.s or higher in a polymerizer.