| abstract |
The present invention provides a continuous production method which is a method for continuously producing a high molecular weight polycarbonate resin by subjecting an aromatic polycarbonate prepolymer and an aliphatic diol compound to a high molecular weight reaction, even if the boiling point is relatively low. The aliphatic diol compound can also be efficiently utilized in connection with a high molecular weight reaction, and is economically advantageous for producing an improved continuous manufacturing method of a high quality high molecular weight polycarbonate resin. An aromatic polycarbonate prepolymer is produced by subjecting an aromatic dihydroxy compound and a carbonic acid diester to a polycondensation reaction, and an aliphatic diol having an aliphatic group bonded to a terminal hydroxyl group is obtained under reduced pressure. A method of adding a compound to the prepolymer mixture obtained in the method of linking a high molecular weight reaction, and adding an aliphatic diol compound under a pressure of more than 200 torr, the aromatic polycarbonate prepolymer in the prepolymer mixture Before the terminal hydroxyl group concentration reaches 2000 ppm, it is supplied to the linked high molecular weight reaction. |