Method of manufacturing polyesters

Details Method of manufacturing polyesters Method of manufacturing polyesters

1994-12-21

1996-05-21

Acquah, Samuel A.

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

Synthetic resins

Treating polymer containing material or treating a solid...

528272, 528275, 528280, 528481, 528490, 528501, 528502, 528503, 210767, C08F 600

Patent

active

055191126

ABSTRACT:
The invention provides a method of manufacturing polyesters which comprises an esterifying step wherein a dicarboxylic acid and a dihydroxyl compound are esterified and the next liquid phase polycondensation step wherein the resulting ester is subjected to liquid phase polycondensation in the presence of a polycondensation catalyst while a distillate which contains an reacted dihydroxyl compound and the polycondensation catalyst is distilled, wherein the distillate is subjected to a purification treatment comprising:

REFERENCES:
patent: 3257335 (1966-06-01), Whitfield , Jr. et al.
patent: 3703488 (1972-11-01), Morton
patent: 3884850 (1975-05-01), Ostrowski
patent: 4226973 (1980-10-01), Malo et al.
patent: 4263425 (1981-04-01), Rothe et al.
patent: 4620032 (1986-10-01), Doerr

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