Process for preparing polyesters

Details Process for preparing polyesters Process for preparing polyesters

C - Chemistry, Metallurgy

08

G

402/203, 402/214

C08G 63/82 (2006.01)

Patent

CA 1047691

Abstract of the Disclosure A process for preparing a polyester which comprises reacting a di-lower alkyl ester of a difunctional carboxylic acid at least 90 mole % of which consists of terephthalic acid with a polymethylene glycol containing 2 to 10 carbon atoms at least 90 mole % of which consists of ethylene glycol in the presence of an ester-interchange reaction catalyst to form an ester- interchange reaction product, and then polycondensing it in the presence of a polycondensation catalyst, wherein a substantially uniform solution in ethylene glycol of (A) 20 to 150 millimole %, based on said di-lower alkyl ester of the difunctional carboxylic acid, of calcium acetate and (B) 2 to 25 millimole %, based on said di-lower alkyl ester, of cobalt acetate is used as the ester-interchange reaction catalyst. The fiber-forming polyester thus produced has enhanced whiteness over similar known polyesters which disadvan- tageously exhibit yellowness.

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