Method of preparing cyclic oligomeric polycarbonates

Details Method of preparing cyclic oligomeric polycarbonates Method of preparing cyclic oligomeric polycarbonates

1987-03-03

1988-02-02

Anderson, Harold D.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528198, 528199, C08G 6362

Patent

active

047229942

ABSTRACT:
A catalyzed interfacial polycondensation aromatic polycarbonate process comprising mixing a water soluble metal salt of a dihydric phenol with an aqueous solution of a strong base and a polymerization catalyst in an inert organic solvent; heating the mixture; concurrently adding a carbonyl halide, additional strong base and additional water soluble metal salt of a dihydric phenol to the heated mixture to form the cyclic oligomeric polycarbonate; and recovering the cyclic oligomeric polycarbonate. The preferred process utilizes the di-sodium salt of bisphenol-A, triethylamine polymerization catalyst and methylene chloride solvent with phosgene to form the cyclic oligomeric polycarbonates. The cyclic oligomeric polycarbonate products are accumulated in the organic phase of the reaction mixture and recovered therefrom by conventional techniques.

REFERENCES:
patent: 4139687 (1979-02-01), Sannes
patent: 4197394 (1980-04-01), Hallgren
patent: 4644053 (1987-02-01), Brunelle et al.

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