Process for preparing highly polymerized aromatic polycarbonate resin

摘要

The present invention is to provide a process for preparing a highly polymerized aromatic polycarbonate resin, which comprises the steps of a highly polymerizing step for reacting an aromatic polycarbonate prepolymer and an aliphatic diol compound in the presence of a transesterification catalyst to obtain a highly polymerized aromatic polycarbonate resin, a cyclic carbonate removal step for removing at least part of the cyclic carbonate by-produced in the above highly polymerizing step out of the reaction system, and a recycle step of hydrolyzing the cyclic carbonate removed in the cyclic carbonate removal step to obtain an aliphatic diol compound and using the obtained aliphatic diol compound as at least a part of the aliphatic diol compound to be used in the highly polymerizing step.

主权项

1. A process for preparing a highly polymerized aromatic polycarbonate resin, which comprises:
highly polymerizing an aromatic polycarbonate prepolymer and an aliphatic diol compound represented by the following formula (g2), the highly polymerizing including reacting the aromatic polycarbonate prepolymer and the aliphatic diol compound in the presence of a transesterification catalyst to obtain a highly polymerized aromatic polycarbonate resin; removing at least part of cyclic carbonate by-product produced in the highly polymerizing to obtain removed cyclic carbonate, the removing including removing a distillate containing at least a part of the cyclic carbonate formed in the highly polymerizing; and hydrolyzing the removed cyclic carbonate to obtain an obtained aliphatic diol compound and recycling the obtained aliphatic diol compound as at least a part of the aliphatic diol compound in the highly polymerizing:wherein, in the formula (g2), Ra and Rb each independently represent a hydrogen atom, a halogen atom, a linear or branched alkyl group having 1 to 30 carbon atoms which may contain an oxygen atom or a halogen atom, a cycloalkyl group having 3 to 30 carbon atoms which may contain an oxygen atom or a halogen atom, an aryl group having 6 to 30 carbon atoms which may contain an oxygen atom or a halogen atom, or an alkoxy group having 1 to 15 carbon atoms which may contain an oxygen atom or a halogen atom, or Ra and Rb may be bonded to each other to form a ring; R1 to R4 each independently represent a hydrogen atom, a halogen atom or a linear or branched alkyl group having 1 to 5 carbon atoms; and n represents an integer of 0 to 30.