Method of polymerizing deionized bis-.beta.-hydroxyethyl...

Details Method of polymerizing deionized bis-.beta.-hydroxyethyl... Method of polymerizing deionized bis-.beta.-hydroxyethyl...

C - Chemistry, Metallurgy

08

G

C08G 63/78 (2006.01) C08G 63/86 (2006.01) C08G 63/183 (2006.01)

Patent

CA 2355309

A method of producing a polyester from high-purity bis-.beta.-hydroxyethyl terephthalate as a raw material containing cations and anions in trace amounts. Polyester production raw materials including bis-.beta.-hydroxyethyl terephthalate containing cations and anions in a total weight of not more than 50 ppm, ethylene glycol and antimony trioxide and/or germanium dioxide as a polymerization catalyst are heated without substantially distilling off ethylene glycol and then heated under reduced pressure to be polycondensed while ethylene glycol is distilled off.

L'invention concerne un procédé de production de polyester dans lequel le téréphtalate bis- beta -hydroxyéthyl désionisé contenant une très faible quantité de cations et d'anions est utilisé comme produit de départ. Ce procédé consiste à: chauffer les matériaux d'alimentation utilisés pour produire le polyester qui comporte du téréphtalate bis- beta -hydroxyéthyl désionisé contenant des cations et des anions en quantité totale égale à 50 ppm au poids au maximum, de l'éthylèneglycol, et du trioxyde antimoine et/ou du dioxyde germanium comme catalyseur de la polymérisation, essentiellement sans distillation de l'éthylèneglycol et ensuite à chauffer le système de réaction à pression réduite, afin de réaliser une polycondensation tandis que l'éthylèneglycol continue d'être distillé.

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