Patent ID: 6525163
Filing Date: 2003-02-25
Classification: C08G

Abstract:
A process for the production of an aromatic polycarbonate, comprising the steps of:(a) preparing a polycarbonate having free terminal OH groups by a melt transesterification process from an aromatic dihydroxy compound and a carbonic acid diester; (b) adding to the polycarbonate having free terminal OH groups, a sufficient amount of an end-capping agent of the following formula for capping the free terminal â€”OH groups of the polycarbonate, thereby forming a polycarbonate with an increased level of capped or blocked hydroxy groups: â€ƒwherein R1 is a phenyl, phenoxy, benzyl, or benzyloxy and R2 is selected from the group consisting of C1-C30 alkyl, C1-C30 alkoxy, C6-C30 aryl, C6-C30 aryloxy, C7-C30 aralkyl, and C7-C30 aralkyloxy.