Linear copolycarbonate from hydroquinone-bisphenol cyclic copoly

Details Linear copolycarbonate from hydroquinone-bisphenol cyclic copoly Linear copolycarbonate from hydroquinone-bisphenol cyclic copoly

1988-12-27

1991-02-19

Anderson, Harold D.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528196, 528204, 528370, 528371, C08G 6404

Patent

active

049945475

ABSTRACT:
Cyclic copolycarbonate oligomer mixtures are prepared from mixtures of hydroquinone bischloroformate and bischloroformates of bisphenols, typically bisphenol A or a spirobiindane bisphenol, by condensation in the presence of an amine, an aqueous base and a non-polar organic liquid. By heating with a polycarbonate formation catalyst, they may be converted to solvent-resistant linear polycarbonates, many of which are crystalline.

REFERENCES:
patent: 4552949 (1985-11-01), Mark
patent: 4644053 (1987-02-01), Brunelle et al.
patent: 4775741 (1988-10-01), Brunelle et al.
patent: 4920200 (1990-04-01), Brunelle et al.

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