Preparation of resin composition from cyclic polycarbonate oligo

Details Preparation of resin composition from cyclic polycarbonate oligo Preparation of resin composition from cyclic polycarbonate oligo

1987-06-08

1988-10-04

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, 528201, 528370, C08G 6362

Patent

active

047757418

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: 4605731 (1986-08-01), Evans et al.
patent: 4636559 (1987-01-01), Rosenquist et al.
patent: 4644053 (1987-02-01), Brunelle et al.
patent: 4696997 (1987-09-01), Rosenquist
patent: 4701519 (1987-10-01), Evans et al.
patent: 4727134 (1988-02-01), Brunelle et al.

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