Method for preparing copolyestercarbonates

Details Method for preparing copolyestercarbonates Method for preparing copolyestercarbonates

C - Chemistry, Metallurgy

08

G

402/172

C08G 63/64 (2006.01)

Patent

CA 2013341

METHOD FOR PREPARING COPOLYESTERCARBONATES RD-19299 Copolyestercarbonates are prepared by the reaction of at least one cyclic polycarbonate oligomer with at least one cyclic polyester oligomer in the presence of a cyclic polycarbonate polymerization catalyst at temperatures in the range of about 280-375°C. Mixtures of bisphenol A polycar- bonate and bisphenol A isophthalate or terephthalate oligo- mers are preferably employed, and the preferred catalysts are tetraarylborate salts such as tetra-n-butylammonium tetraphenylborate.

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