| abstract |
The present invention provides an improved continuous production method of high-molecular-weight polycarbonate resin. In this method, an aromatic polycarbonate prepolymer and an aliphatic diol compound are subjected to a connection high-molecular-weight reaction to continuously produce high-molecular-weight polycarbonate resins. Even if the polycarbonate resin is an aliphatic diol compound with a low boiling point, it can effectively participate in the linking reaction to increase the molecular weight, and it is possible to economically and advantageously manufacture a high-molecular-weight polycarbonate resin with excellent quality. Polycondensation reaction of aromatic dihydroxy compound and diester carbonate to produce aromatic polycarbonate prepolymer, to which aliphatic diol compound having aliphatic group bonded to terminal hydroxyl group is added to obtain prepolymer mixture , the prepolymerization mixture is subjected to a linking high molecular weight reaction under reduced pressure. In this method, after adding an aliphatic diol compound at a pressure exceeding 200 torr, the aromatic polycarbonate in the prepolymer mixture is pre- Before the terminal hydroxyl group concentration of the polymer reached 2000 ppm, this prepolymer mixture was supplied to the linking high molecular weight reaction. |