Process for separating and polymerizing cyclic oligomeric polyca

Details Process for separating and polymerizing cyclic oligomeric polyca Process for separating and polymerizing cyclic oligomeric polyca

1985-12-23

1987-08-11

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, 528370, 528491, C08G 6362

Patent

active

046862773

ABSTRACT:
A process for separating solid cyclic oligomeric dihydric phenol carbonate from solid high molecular weight linear aromatic polycarbonate which comprises admixing an organic solvent with a composition comprising major quantities of solid high molecular weight linear aromatic polycarbonate and minor quantities of solid cyclic oligomeric dihydric phenol carbonate and separating the cyclic oligomeric dihydric phenol carbonate soluble in the organic solvent from the high molecular weight linear aromatic polycarbonate insoluble in the organic solvent, said organic solvent selected so that a very large fraction of the said solid cyclic oligomer is separated from a very large fraction of the said polycarbonate which remains as a solid in the organic solvent.

REFERENCES:
patent: 3213060 (1965-10-01), Jackson et al.
patent: 3410823 (1968-11-01), Cleveland

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