Patent ID: 9243106
Filing Date: 2016-01-26
CPC Classification: C08G

Claim Text:
1. A method for continuously producing a high molecular weight polycarbonate resin, comprising: a step (A) for producing an aromatic polycarbonate prepolymer by a polycondensation reaction between an aromatic dihydroxy compound and a diester carbonate, a step (B) for adding an aliphatic diol compound having an aliphatic group that bonds to a terminal hydroxyl group to the aromatic polycarbonate prepolymer obtained in step (A) to obtain a prepolymer mixture, and a step (C) for subjecting the prepolymer mixture obtained in step (B) to a linking and highly polymerizing reaction under a reduced pressure condition; wherein, in step (B), the aliphatic diol compound is added to the aromatic polycarbonate prepolymer obtained in step (A) at a pressure exceeding 200 torr to obtain the prepolymer mixture, and then, the prepolymer mixture is subjected to a linking and highly polymerizing reaction under a reduced pressure condition in step (C) before the terminal hydroxyl group concentration of the aromatic polycarbonate prepolymer in the prepolymer mixture reaches 2000 ppm.