A method of manufacturing polyesters

Details A method of manufacturing polyesters A method of manufacturing polyesters

C - Chemistry, Metallurgy

08

G

C08G 63/16 (2006.01) C08G 63/78 (2006.01) C08G 63/90 (2006.01)

Patent

CA 2138729

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: (a) a distilling step; (b) a filtering step; and (c) a decoloring step and then the thus purified distillate is recovered and supplied to the esterifying step. A further method comprises a purification treatment comprising: (a) a distilling step; (b) a depolymerizing step; and (c) a decoloring step.

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