申请人:IDEMITSU KOSAN COMPANY LIMITED
公开号:EP0807657A1
公开(公告)日:1997-11-19
There are disclosed a process for producing a polycarbonate through transesterification which comprises using, as a polymerization catalyst, (1) a combination of a nitrogen-containing organic basic compound and a quaternary phosphonium salt, (2) a tetraarylphosphonium salt having a specific chemical structure, or (3) a quaternary phosphonium salt having a specific chemical structure and containing a branched alkyl group; and a process for producing a polycarbonate which comprises the steps of preparing a polycarbonate prepoplymer by preliminary polymerization and thereafter polymerizing the resultant prepolymer in a state of a solid phase by the use of a quaternary phosphonium salt as a catalyst.
By using any of these processes it is made possible to produce, in extremely high efficiency, a high-quality polycarbonate being excellent in appearance, heat resistance, hydrolysis resistance and the like.
本发明公开了一种通过酯交换反应生产聚碳酸酯的工艺,该工艺包括使用以下物质作 为聚合催化剂:(1)含氮有机碱性化合物和季鏻盐的组合;(2)具有特定化学结构的四 季鏻盐;或(3)具有特定化学结构并含有支链烷基的季鏻盐;以及一种生产聚碳酸酯的工艺,该工艺包括以下步骤:通过初步聚合制备聚碳酸酯预聚物,然后使用季鏻盐作为催化剂,在固相状态下聚合得到的预聚物。
采用上述任何一种工艺,都能以极高的效率生产出外观、耐热性、耐水解性等性能优异的高质量聚碳酸酯。