Preparation of polycarbonates with bioxyanion catalyst

Details Preparation of polycarbonates with bioxyanion catalyst Preparation of polycarbonates with bioxyanion catalyst

1992-04-09

1994-02-22

Anderson, Harold D.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528196, 528198, C08G 6430

Patent

active

052888380

ABSTRACT:
The invention discloses an improved process for the preparation of aryl polycarbonates. The process involves reacting aryl carbonate and dihydric phenol in the melt phase with a catalyst belonging to the class of quaternary ammonium bioxyanions having the general formula: ##STR1## Wherein `X` represents a carboxylate or a phenolate group or a mixture thereof and `R` represents alkyl or aryl.

REFERENCES:
patent: 3442854 (1969-05-01), Curtius etal.
Webster et al. JACS, 105, (1983), 5706.

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