Separation of cyclic oligomeric carbonate from high molecular we

Details Separation of cyclic oligomeric carbonate from high molecular we Separation of cyclic oligomeric carbonate from high molecular we

1985-12-23

1987-05-05

Anderson, Harold D.

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

Synthetic resins

Treating polymer containing material or treating a solid...

528196, 528498, C08G 6362

Patent

active

046634339

ABSTRACT:
A process for separating cyclic oligomeric dihydric phenol carbonate from high molecular weight linear aromatic polycarbonate which comprises admixing a solution of aromatic polycarbonate and oligomeric dihydric phenol carbonate in a halogenated organic solvent with an antisolvent selected from the group consisting of butanol, isobutanol and an alkane of from five to about nine carbon atoms, inclusive, separating the solid aromatic polycarbonate from the solution of cyclic oligomeric dihydric phenol carbonate, increasing the antisolvent to halogenated organic solvent ratio and thereby precipitate the cyclic oligomeric dihydric phenol carbonate.

REFERENCES:
patent: 3213060 (1965-10-01), Jackson et al.
patent: 3264262 (1966-08-01), Baker et al.
patent: 3264263 (1966-08-01), Baker
patent: 3410823 (1968-11-01), Cleveland
patent: 3668181 (1972-06-01), Oxenrider
Chemistry and Physics of Polycarbonates, Schnell, 1964, pp. 99-101.

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