Method for continuous production of high-molecular-weight polycarbonate resin

Abstract

The present invention provides an improved method for continuously producing a high-molecular-weight polycarbonate resin by carrying out a linking and highly-polymerizing reaction of an aromatic polycarbonate prepolymer with an aliphatic diol compound wherein the retention time of the reaction mixture in the linking and highly-polymerizing reactor is shortened to achieve excellent performance. The process comprises a process (A) for producing an aromatic polycarbonate prepolymer by polycondensation reaction of an aromatic dihydroxy compound with diester carbonate and a process (B) for conducting linking and highly-polymerizing reaction of the aromatic polycarbonate prepolymer with an aliphatic diol compound in the linking and highly-polymerizing reactor, wherein the aromatic polycarbonate prepolymer produced by the process (A) is fed continuously to the linking and highly-polymerizing reactor, while the aliphatic diol compound is fed continuously thereto under reduced pressure of 10 torr or less to carry out the reaction.

Dependencies are inferred from the claim text.