Catalyst for producing polyester, process for producing the...

C - Chemistry – Metallurgy – 08 – G

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C08G 63/84 (2006.01) C08G 63/82 (2006.01) C08G 63/83 (2006.01)

Patent

CA 2253515

A polymerization catalyst for polyester production which is a solution of solutes comprising an aluminum compound and an alkali compound in water, an organic solvent, or a mixture of both; and a process for producing a polyester which comprises esterifying or transesterifying an aromatic dicarboxylic acid or an ester-forming derivative thereof with a diol or an ester-forming derivative thereof and condensation-polymerizing the resultant reaction product, characterized by using the polymerization catalyst containing an aluminum compound. The catalyst can yield a polyester having excellent moldability and being usable for producing moldings such as fibers, films, resins, bottles, etc., without posing problems such as nozzle fouling, filtering pressure increase, thread breakage, film breakage, and defects caused by foreign substances.

L'invention porte sur un catalyseur de production de polyester consistant en une solution de solutés comprenant un composé d'aluminium et un composé alcalin dans de l'eau ou dans un solvant organique ou un mélange des deux, et sur un procédé de production d'un polyester consistant à estérifier ou transestérifier un acide dicarboxylique aromatique ou un de ses dérivés générateur d'ester avec un diol ou l'un de ses dérivés générateur d'ester, puis à polymériser par condensation le produit de réaction résultant et cela en utilisant le catalyseur de polymérisation contenu dans un composé d'aluminium. Ledit catalyseur donne un polyester très facile à mouler et pouvant servir à produire des produits moulés tels que des fibres, des films, des résines, des bouteilles sans poser de problèmes tels que l'encrassement des filières, l'accroissement de la pression de filtrage, la rupture des films, ou des défauts dus à des substances étrangères.

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