Method for producing polyesters and copolyesters

Details Method for producing polyesters and copolyesters Method for producing polyesters and copolyesters

C - Chemistry, Metallurgy

08

G

C08G 63/85 (2006.01) C08G 63/82 (2006.01)

Patent

CA 2293676

The invention relates to a method for producing polyesters and copolyesters. According to said method, coprecipitates are used as polycondensation catalysts alone or as mixtures, which coprecipitates were produced by simultaneous hydrolytic precipitation of a titanium compound and a metal compound of a metal selected from the groups IA, IIA, VIIIA, IB, IIB, IIIB and IVB. The titanium compound and the metal compound independently of each other are an alkylate, alcoholate or carboxylate of the titanium or metal and the molar ratio of titanium compound to metal compound is 50:50 mol/mol. The coprecipitates have a greater catalytic activity than Sb2O3, so that the preferred quantity used is only between 10 and 100 ppm in relation to the esters or oligo-esters to be polycondensated.

L'invention concerne un procédé de production de polyesters et de copolyesters dans lequel on utilise, individuellement ou en mélange, des coprécipités comme catalyseurs de polycondensation, coprécipités produits par précipitation hydrolytique simultanée d'un composé de titane et d'un composé d'un métal choisi dans les groupes IA, IIA, VIIIA, IB, IIB, IIIB et IVB. Le composé de titane et le composé métallique sont, indépendamment l'un de l'autre, un alkylat, un alcoolat ou un carboxylat du titane ou du métal et le rapport molaire du composé de titane au composé métallique est supérieur ou égal à 50 : 50 mole/mole. Les coprécipités présentent une activité catalytique supérieure à Sb¿2?O¿3?, de sorte que le volume utilisé de préférence ne représente que 10 à 100 ppm par rapport aux esters ou oligoesters à polycondenser.

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