PRODUCTION METHOD FOR AROMATIC POLYCARBONATE RESIN HAVING INCREASED MOLECULAR WEIGHT

摘要

The present invention provides a production method for an aromatic polycarbonate resin having increased molecular weight, including: a molecular weight increasing step in which an aromatic polycarbonate prepolymer and an aliphatic diol compound are reacted in the presence of a transesterification catalyst and an aromatic polycarbonate resin having increased molecular weight is obtained; and an annular carbonate removal step in which at least some annular carbonate produced as a by-product in the molecular weight increasing step is removed to outside the reaction system. An extracted liquid including the by-product annular carbonate removed in the annular carbonate removal step is hydrolyzed, sometimes oil/water separation is performed, then the liquid is purified and the aliphatic diol compound is separated, and reused in the molecular weight increasing step.