Preparing method of polycarbonate

摘要

The present invention provides a method for manufacturing polycarbonate having outstanding color matching, outstanding retention of stability during molding, such as thermal stability and color-matching stability, and outstanding transparency and water resistance. The method is characterized in that (a) a nitrogen-containing basic compound is used as a catalyst dissolved or dispersed in a monohydroxy compound or an aqueous solution of a monohydroxy compound. This catalyst solution is added to a melt polycondensation reaction system, and an aromatic dihydroxy compound and a carbonic acid diester are subjected to melt polycondensation. It is preferable to use a monohydroxy compound produced as a by-product of a polycondensation reaction between an aromatic dihydroxy compound and a carbonic acid diester as the monohydroxy compound, and it is particularly preferable that the aromatic monohydroxy compound is a phenol.