CARBONIC DIESTER, AROMATIC POLYCARBONATE, PRODUCTION APPARATUS, AND PROCESS FOR PRODUCTION
申请人:TEIJIN LIMITED
公开号:EP0992522A1
公开(公告)日:2000-04-12
Aromatic polycarbonate having a reduced discoloration and improved heat stability, hue, etc. is provided by keeping a pressure in a raw material melting vessel and the linear velocity of a gas in a transporting piping in a specific range, keeping the concentration of a nitrogen-containing basic compound in a specific range, recycling a byproduct containing specific amounts of impurities, suppressing the amounts of a nitrogen-containing basic compound, metallic elements and a silicic acid derivative in the carbonic acid diester at specific values or less, prescribing the material quality of the reaction facilities, and/or forming an oxide layer at the inner wall surfaces of the reaction facilities.
通过将原料熔化容器中的压力和输送管道中的气体线速度保持在特定范围内,将含氮碱性化合物的浓度保持在特定范围内,循环使用含氮碱性化合物,从而提供了变色减少、热稳定性和色调等性能均得到改善的芳香族聚碳酸酯。将原料熔化容器中的压力和输送管道中气体的线速度保持在特定范围内,将含氮碱性化合物的浓度保持在特定范围内,回收含有特定数量杂质的副产品,将碳酸二酯中的含氮碱性化合物、金属元素和硅酸衍生物的数量控制在特定值或更低,规定反应设备的材料质量,和/或在反应设备的内壁表面形成氧化层,从而提供具有减少变色和提高热稳定性等特性的芳香族聚碳酸酯。