Patent ID: 6333394
Filing Date: 2001-12-25
Classification: C08G

Abstract:
A method for preparing a copolycarbonate which comprises:(I) contacting (A) a precursor polycarbonate with (B) a monomeric or polymeric source of structural units having structural features different from those present in component A, which are to be incorporated in the copolycarbonate, said contact being under conditions promoting reaction of components A and B with incorporation of the structural units in component B to form a precursor copolycarbonate;(II) converting component A, component B or said precursor copolycarbonate to a polycarbonate of enhanced crystallinity, either prior to or following step I; and(III) subjecting said copolycarbonate of enhanced crystallinity to solid state polymerization, following step II and either concurrently with or following step I.