Poly(ester-carbonates) from dicarboxylic acid chlorides

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

C - Chemistry, Metallurgy

08

G

402/179

C08G 63/64 (2006.01)

Patent

CA 1137692

INVENTOR: JOSEFINA T. BAKER, ROBERT S. COOKE and STYLIANOS SIFNIADES INVENTION: POLY(ESTER-CARBONATES) FROM DICARBOXYLIC ACID CHLORIDES ABSTRACT OF THE DISCLOSURE 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.

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