METHOD FOR STORING DIHYDROXY COMPOUND TO BE USED AS STARTING MATERIAL FOR POLYCARBONATE, METHOD FOR PREPARING STARTING MATERIAL FOR POLYCARBONATE AND METHOD FOR PRODUCING POLYCARBONATE
申请人:Mitsubishi Chemical Corporation
公开号:EP2354175A1
公开(公告)日:2011-08-10
A subject for the invention is to provide a method of production for stably producing a polycarbonate excellent in transparency, color tone, heat resistance, moldability, and mechanical strength and having excellent optical properties. The invention relates to a method of producing a polycarbonate from a dihydroxy compound ingredient including at least a dihydroxy compound having the structure represented by the following formula (1) in the molecule and from a carbonic acid diester, the method including mixing the dihydroxy compound having the structure represented by the following formula (1) in the molecule with the carbonic acid diester in a molten state at a temperature of from 70°C to 240°C and a pressure of from 0.06 MPa to 0.20 MPa for a period of from 0.5 hours to 30 hours and then causing a transesterification reaction to proceed at a pressure lower than 0.06 MPa to produce a polycarbonate,
[Chem. 1] -CH2-O- (1)
(provided that the structure of formula (1) in which the oxygen atom is bonded to a hydrogen atom is excluded).
本发明的目的是提供一种生产方法,以稳定地生产出透明度、色调、耐热性、成型性和机械强度优异且光学性能优良的聚碳酸酯。本发明涉及一种用二羟基化合物配料生产聚碳酸酯的方法,该二羟基化合物配料包括至少一种分子中具有下式(1)所代表结构的二羟基化合物和一种碳酸二酯,该方法包括将分子中具有下式(1)所代表结构的二羟基化合物与碳酸二酯在熔融状态下混合,混合温度为 70°C 至 240°C,压力为 0.06 兆帕至 0.20 兆帕,时间为 0.5 小时至 30 小时,然后在低于 0.06 兆帕的压力下进行酯交换反应,生成聚碳酸酯、
[化学 1] -CH2-O- (1)
(但不包括氧原子与氢原子成键的式(1)结构)。