Patent ID: 6365703
Filing Date: 2002-04-02
Classification: C08G

Abstract:
A method for preparing a branched polycarbonate via solid state polymerization, said method comprising:a) exposing a solid amorphous polycarbonate precursor comprising repeat units I wherein R1 and R2 are independently fluorine, chlorine, bromine, aliphatic, cycloaliphatic or aromatic radicals, n and m are integers having values of 0 to 4, and W is an aliphatic radical, a cycloaliphatic radical an aromatic radical, or an oxygen, sulfur, SO or SO2 linking group, to a mixture comprising solvent vapors and branching agent vapors to produce a partially crystalline precursor polycarbonate containing said branching agent; and b) subjecting said precursor polycarbonate to SSP to form said branched polycarbonate.