RECYCLING OF WASTE AROMATIC POLYCARBONATE RESIN

摘要

PURPOSE:To provide an essential recycling process whereby the aromatic dihydroxy compound and the diaryl carbonate obtained by the decomposition of a waste aromatic polycarbonate resin can be utilized again as starting materials for an aromatic polycarbonate resin. CONSTITUTION:This recycling process comprises step 1 of transesterifying a waste aromatic polycarbonate resin with an aromatic monohydroxy compound, step 2 of distilling off the aromatic monohydroxy compound from the product obtained by step 1, step 3 of distilling and recovering the diaryl carbonate compound from the high-boiling mixture as the residue from step 2, and step 4 of distilling and recovering the aromatic dihydroxy compound from the still- higher-boiling mixture as the residue from step 3.