Higher molecular weight polyesters from diacid anhydrides and cy

Details Higher molecular weight polyesters from diacid anhydrides and cy Higher molecular weight polyesters from diacid anhydrides and cy

1983-12-05

1985-02-26

Anderson, Harold D.

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

Synthetic resins

From carboxylic acid or derivative thereof

528370, C08G 6300

Patent

active

045018774

ABSTRACT:
Higher molecular weight polyesters are prepared from diacid anhydrides and cyclic alkylene carbonates by the process of first drying the reaction mixture either totally or at least substantially completely by azeotropic distillation of water using a suitable organic medium. The catalyst is then added and the polycondensation conducted as conventional. The polymers obtained are markedly higher in molecular weight than if the drying step is omitted, and the polycondensation period is dramatically shortened.

REFERENCES:
patent: 3211702 (1965-10-01), Van Gijzen

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