Poly(ester-carbonates) from dicarboxylic acid chlorides

Details Poly(ester-carbonates) from dicarboxylic acid chlorides Poly(ester-carbonates) from dicarboxylic acid chlorides

1979-01-25

1980-03-18

Lee, Lester L.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528194, 528196, 528199, C08G 6364

Patent

active

041940385

ABSTRACT:
A process for poly(ester-carbonates) from dihydric phenols, especially bisphenol A; aromatic or cycloaliphatic dicarboxylic acids, especially terephthalic acid; and phosgene as carbonate precursor wherein a reaction of the acid and phosgene is carried out in a first stage forming dicarboxylic acid chloride; and then phosgene and bisphenol A are added in separate streams, simultaneously during most of the second or condensation stage. Thereby only one kettle is required for carrying out the complete polymer production.

REFERENCES:
patent: 3169121 (1965-02-01), Goldberg
patent: 3313862 (1967-04-01), Siggel et al.
patent: 4127561 (1978-11-01), Alewelt et al.

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