Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having a halogen atom or oxygen single bonded...
Patent
1987-12-22
1989-03-21
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...
526 65, 528196, 528370, C08G 6362
Patent
active
048144290
ABSTRACT:
Cyclic polycarbonate oligomers are prepared by the reaction of a bisphenol bischloroformate (e.g. bisphenol A bischloroformate) with an amine (e.g., triethylamine) and an alkali or alkaline earth metal hydroxide in at least two back-mixed vessels and in a mixed aqueous-organic system. The liquid contents of each vessel except the last are passed to the next vessel and each vessel is simultaneously charged with reactants, with the concentration of carbonate units in the reactants being less in the first vessel than in subsequent vessels. By this method, there is obtained a cyclic product containing a minimum proportion of linear polycarbonates.
REFERENCES:
patent: 4616077 (1986-10-01), Silva
patent: 4727134 (1988-02-01), Brunelle et al.
Anderson Harold D.
Davis Jr. James C.
General Electric Company
Magee Jr. James
Pittman William H.
LandOfFree
Method for preparing cyclic polycarbonate oligomers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for preparing cyclic polycarbonate oligomers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for preparing cyclic polycarbonate oligomers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-477818