Patent ID: 6437083
Filing Date: 2002-08-20
Classification: C08G

Abstract:
A melt reaction process for the production of a branched aromatic polycarbonate, the process comprising:reacting a diarylcarbonate and a polyhydric alcohol in the presence of an alkaline catalyst to produce a polycarbonate oligomer; adding a branching agent to the polycarbonate oligomer, wherein the branching agent has the formula (I): AGyâ€ƒâ€ƒ(1) wherein A is a C1-20 polymethylene, C2-20 alkylene or alkylidene, C5-36 cycloalkylene or cycloalkylidene, C6-36 arylene or alkylarylene, or C6-36 arylalkylene, wherein G is an aromatic moiety having at least one hydroxyl group bonded directly to the aromatic group and y is an integer greater than 2, and wherein each G may be the same or different; andproducing a branched aromatic polycarbonate having a melt index ratio greater than an aromatic polycarbonate produced from the polycarbonate oligomer without the addition of the branching agent.