Process for preparing aromatic carbonate polymers

Details Process for preparing aromatic carbonate polymers Process for preparing aromatic carbonate polymers

1976-09-03

1978-09-19

Pertilla, Theodore E.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

C08G 6362

Patent

active

041153588

ABSTRACT:
A process for preparing a polycarbonate, which polycarbonate has improved resistance to thermal degradation and improved impact resistance and consists of reacting at least 70 weight percent of a stoichiometric amount of a carbonate precursor such as phosgene with a dihydric phenol such as bisphenol-A while simultaneously adding to the reaction medium an alkali metal hydroxide such as sodium hydroxide to maintain a pH of 6.0 to about 10.0. The pH is then raised to 11.0 by adding sufficient alkali metal hydroxide.

REFERENCES:
patent: 3248366 (1966-04-01), Schmidt et al.
patent: 3275601 (1966-09-01), Schnell et al.
patent: 3386954 (1968-06-01), Schnell et al.
patent: 3410823 (1968-11-01), Cleveland et al.
patent: 3466260 (1969-09-01), Bostian et al.
patent: 3468846 (1969-09-01), Bottenbruch et al.

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