Method for preparing cyclic polycarbonate oligomers

Details Method for preparing cyclic polycarbonate oligomers Method for preparing cyclic polycarbonate oligomers

C - Chemistry, Metallurgy

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D

260/350.5

C07D 323/00 (2006.01) C08G 64/06 (2006.01) C08G 64/26 (2006.01)

Patent

CA 1249835

METHOD FOR PREPARING CYCLIC OLYCARBONATE OLIGOMERS Abstract Cyclic polycarbonate oligomers are prepared by a method which is adaptable to continuous operation, by the reaction of a bisphenol bischloroformate (e.g., bisphenol A bischloroformate) with an amine (e.g., triethylamine) and an alkali metal hydroxide in a tank reactor (preferably a continuous stirred tank reactor) in a mixed aqueous-organic system, with agitation (preferably by stirring) at a rate just sufficient to prevent segregation of the aqueous and organic liquid phases. The residence time of the mixture in the reactor is preferably about 8-12 minutes.

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