会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 1. 发明申请
    • METHOD FOR PREPARING HIGH MOLECULAR WEIGHT POLYCARBONATE
    • 制备高分子量聚碳酸酯的方法
    • WO2003100206A1
    • 2003-12-04
    • PCT/KR2003/001048
    • 2003-05-28
    • LG CHEM, LTD.KIM, Jong-HunWOO, Boo-GonPARK, Eun-DuckHONG, Mi-Jeung
    • KIM, Jong-HunWOO, Boo-GonPARK, Eun-DuckHONG, Mi-Jeung
    • E21B17/042
    • C08G64/307Y10T428/31504Y10T428/31507
    • The present invention relates to a process for preparing high molecular weight polycarbonate resin, particularly to a process for preparing high molecular weight polycarbonate resin, which conducts condensation polymerization of low molecular weight amorphous polycarbonate prepolymer prepared by transesterification of dialkyl(aryl)carbonate and aromatic hydroxy compound and solid state polymerization within short time to increase molecular weight. The present invention introduces condensation polymerization to lower mole fractions of arylcarbonate existing in unreacted diarylcarboante, end groups of reaction by products of polymerization degree less than 3, and polycarbonate prepolymer obtained by transesterification, and thus can maximize molecular weight increase of polycarbonate after solid state polymerization and remarkably reduce time required for preparing polycarbonate of the same molecular weight. In addition, since the present invention does not use toxic substance phosgene, it has no danger and it can prevent deterioration, and it can prepare high molecular weigh polycarbonate that can be used for injection and extrusion.
    • 本发明涉及一种制备高分子量聚碳酸酯树脂的方法,特别涉及一种制备高分子量聚碳酸酯树脂的方法,该方法进行低分子量无定形聚碳酸酯预聚物的缩聚,其通过二烷基(芳基)碳酸酯和芳族羟基 化合物和固态聚合在短时间内增加分子量。 本发明将存在于未反应的二芳基羧酸酯中的芳基碳酸酯的摩尔比低,聚合度小于3的产物的反应端基和通过酯交换反应得到的聚碳酸酯预聚物进行缩聚,从而可以使固态聚合后的聚碳酸酯的分子量增加最大化 并且显着地减少了制备相同分子量的聚碳酸酯所需的时间。 此外,由于本发明不使用有毒物质光气,因此没有危险,可以防止劣化,并且可以制备可用于注射和挤出的高分子量聚碳酸酯。