Cyclic polycarbonate oligomers from spirobiindane bisphenols

Details Cyclic polycarbonate oligomers from spirobiindane bisphenols Cyclic polycarbonate oligomers from spirobiindane bisphenols

1986-07-21

1988-04-05

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...

528196, 528371, 528372, C08G 6362

Patent

active

047360160

ABSTRACT:
Cyclic polycarbonate mixtures containing units derived from spirobiindane bisphenols, preferably 6,6'-dihydroxy-3,3,3',3'-tetramethylspirobiindane, are prepared from the corresponding bischloroformates or mixtures thereof with bisphenols. They may be homopolymeric or copolymeric; cyclic oligomer mixtures are preferred. Such oligomers may be converted to linear polycarbonates having high glass transition temperatures.

REFERENCES:
patent: 4552949 (1985-11-01), Mark

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