Patent ID: 9353215
Filing Date: 2016-05-31
CPC Classification: B29B,B29C,B29K,C08G,C08J

Claim Text:
1. A method for producing a polycarbonate resin, comprising performing polycondensation through a transesterification reaction with a catalyst and with a dihydroxy compound and a carbonic acid diester, and continuously feeding the produced polycarbonate resin to an extruder, wherein the polycarbonate is not solidified after the polycondensation and before being fed to the extruder, the dihydroxy compound contains a dihydroxy compound having a moiety represented by the following formula (1) in a part of the structure, the dihydroxy compound having a moiety represented by the following formula (1) contains a compound having a cyclic ether structure, and the temperature at the time of feeding the polycarbonate resin to the extruder is from 180° C. to less than 250° C.: with the proviso excluding the case where the moiety represented by formula (1) is a part of —CH wherein a barrel constituting the extruder has a plurality of heaters and all of the heaters are set to a temperature of 100° C. to less than 250° C.