Patent ID: 6653434
Filing Date: 2003-11-25
Classification: G06F,H04L

Abstract:
A process for the production of an aromatic polycarbonate, the process comprising adding to a polycarbonate oligomer-reaction mixture under melt conditions a compound of the formula (1), forming a polycarbonate with an increased molecular weight in a polymerization promotion reaction: (A) wherein R1 and R3 may be the same or different and are selected from the group consisting of alkoxy, phenoxy, benzoxy, aryloxy, phenyl and aryl groups. R2 is selected from the group consisting of alkyl, phenyl, aryl, or aralkyl groups, and wherein at least 80% by weight of the total amount of the compound of formula (1) is added after the polycarbonate oligomer has reached a number-average molecular weight Mn of about 2,500 to 15,000 Dalton.