Continuous manufacture of linear polyesters

Details Continuous manufacture of linear polyesters Continuous manufacture of linear polyesters

1975-10-06

1977-08-02

Phynes, Lucille M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260475P, C08G 6316

Patent

active

040395154

ABSTRACT:
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.degree. C, followed by polycondensation in the presence of catalysts at from 260.degree. to 290.degree. 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 of the excess of glycols over the molar ratio terephthalic acid: glycols = 1:1 are continuously distilled from the reaction mixture.

REFERENCES:
patent: 2793235 (1957-05-01), Jenkinson
patent: 3050533 (1962-08-01), Munro et al.
patent: 3376353 (1968-02-01), Tate
patent: 3444140 (1969-05-01), Stewart et al.
patent: 3590072 (1971-06-01), Leybourne
patent: 3639448 (1972-02-01), Matsuzawa et al.

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