Patent ID: 6013756
Filing Date: 2000-01-11
Classification: C08G

Abstract:
A method of manufacturing high-molecular polyethyleneterephthalate (PET) or copolyesters thereof, comprising:a) reacting at least one multi-basic carboxylic acid with one or a plurality of multi-functional alcohols to form a low-molecular precondensate up to a conversion of at least 85%, measured by the degree of dehydration, using a titanium compound as a catalyst, the titanium compound being present in a concentration of 0.005 to 0.05 mmol titanium per mol of the at least one carboxylic acid; and effectingb) polycondensation of the low-molecular precondensate in the presence of the titanium compound to form high-molecular PET or copolyesters thereof, a cobalt-containing compound being added in a concentration of 0.02 to 0.2 mmol cobalt per mol of the at least one carboxylic acids;phosphorus-containing inhibitor being added in a concentration of 0.004 to 0.4 mmol phosphorus per mol of the at least one carboxylic acid, the phosphorus-containing inhibitor being added before or simultaneously with the cobalt-containing compound.