Halogen-containing polycarbonate resin and process for...

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C - Chemistry, Metallurgy

08

G

402/174, 400/560

C08G 64/26 (2006.01) C08G 64/02 (2006.01)

Patent

CA 1171198

ABSTRACT OF THE DISCLOSURE A halogen-containing polycarbonate resin is formed by copolymerizing the following oligomers (a) and (b) in the presence of caustic alkali, an organic solvent and water; in the substantial absence of residual bisphenol A, in the substantial absence of added reactant bisphenol A: (a) 10 to 85 parts by weight of a polycarbonate oligomer with terminal groups consisting of chloroformate groups or chloro- formate groups plus hydroxyl groups in a molar amount less than the chloroformate groups, having a number average molecular weight of 500 to 10,000 and containing no aromatic halogen or less than 4% by weight of aromatic halogen, and (b) 90 to 15 parts by weight of an aromatic halogen-containing polycarbonate oligomer with terminal groups consisting of chloroformate groups or chloroformate groups plus hydroxyl groups in a molar amount less than the chloroformate groups, having a number average molecular weight of 1,000 to 10,000 and containing 6 to 30% by weight of aromatic halogen.

398822

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