Method for preparing cyclic polycarbonate oligomer from bischlor

Details Method for preparing cyclic polycarbonate oligomer from bischlor Method for preparing cyclic polycarbonate oligomer from bischlor

1985-11-22

1986-10-07

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having a halogen atom or oxygen single bonded...

528 86, 528370, 528372, C08G 6362

Patent

active

046160779

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.

REFERENCES:
patent: 3269985 (1966-08-01), Loncrini
patent: 3274214 (1966-09-01), Prochaska
patent: 3312660 (1967-04-01), Kurkly et al.
patent: 3386954 (1968-06-01), Schnell et al.

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