Continuous manufacture of linear polyesters

Details Continuous manufacture of linear polyesters Continuous manufacture of linear polyesters

C - Chemistry, Metallurgy

08

G

402/204, 402/205

C08G 63/18 (2006.01) C08G 63/60 (2006.01) C08G 63/78 (2006.01)

Patent

CA 1038996

ABSTRACT OF THE DISCLOSURE An improved process for the continuous manufacture of linear high molecular weight polyesters by direct esterification of terephthalic acid with excess glycols in a medium comprising terephthalic acid glycol esters or their oligomers, under superatmospheric pressure at temperatures above 200°C, followed by polycondensation in the presence Or catalysts at from 260 to 290°C. The improvement is that the mixture fed to the esterification contains terephthalic acid and glycols in the molar ratio of 1:1.15 to 1:1.5 and that during the esterification from 20 to 30% by weight Or the excess of glycols over the molar ratio terephthalic acid:glycols = 1:1 are continuously distilled from the reaction mixture.

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