Method for preparing copolyestercarbonates from cyclic oligomers

Details Method for preparing copolyestercarbonates from cyclic oligomers Method for preparing copolyestercarbonates from cyclic oligomers

1989-06-12

1991-04-09

Anderson, Harold D.

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

Synthetic resins

From carboxylic acid or derivative thereof

528354, 528356, 528357, 528358, 528370, 528371, C08G 6364

Patent

active

050066374

ABSTRACT:
Copolyestercarbonates are prepared by the reaction of at least one cyclic polycarbonate oligomer with at least one cyclic polyester oligomer in the presence of a cyclic polycarbonate polymerization catalyst at temperatures in the range of about 280.degree.-375.degree. C. Mixtures of bisphenol A polycarbonate and bisphenol A isophthalate or terephthalate oligomers are preferably employed, and the preferred catalysts are tetraarylborate salts such as tetra-n-butylammonium tetraphenylborate.

REFERENCES:
patent: 4740583 (1988-04-01), Brunelle et al.
patent: 4757132 (1988-07-01), Brunelle et al.

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