| 摘要 |
<p>PURPOSE:To economically recover an aromatic dihydroxy compound and a diaryl carbonate compound which are usable as high-quality raw materials by reacting a waste aromatic polycarbonate resin with an aromatic monohydroxy compound through transesterification and treating the reaction products in a specific manner. CONSTITUTION:An aromatic polycarbonate resin is reacted with an aromatic monohydroxy compound (X) (e.g. phenol) through transesterification. A diaryl carbonate compound (e.g. diphenyl carbonate) containing the compound X is separated from the transesterification products by distillation. The compound X is added to the remaining aromatic dihydroxy compound (Y) (e.g. bisphenol A), and this mixture is heated to form an adduct of both and then cooled to crystallize the adduct. The resulting crystals are taken out and thermally melted, and the compound X is distilled off to obtain the compound Y. According to need, the compound Y and the diaryl carbonate compound are used as the raw material.</p> |
