Improved process for preparing high molecular weight polyesters

C - Chemistry – Metallurgy – 08 – G

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C08G 63/80 (2006.01) C08G 63/181 (2006.01) C08G 63/88 (2006.01)

Patent

CA 2261293

In an improved process for preparing high molecular weight polyester polymers, such as poly(butylene terephthalate), an alkylene glycol and a di- or tricarboxylic acid or its alkyl ester are reacted in a first step to prepare a pre-polymer in the form of uniform solid particles having an intrinsic viscosity of from 0.1 to about 0.3 dL/gm and a chemical composition which contains greater than a 1 % stoichiometric excess of the alkylene glycol above the amount required to produce a high molecular weight polymer, and then polymerizing the pre-polymer in the solid state. This process avoids the usual melt- polycondensation step at reduced pressure and very high temperature.

Cette invention concerne un procédé perfectionné de préparation de polyesters de poids moléculaire élevé, tels que le poly(téréphtalate de butylène). Ledit procédé consiste tout d'abord à faire réagir un alkylène glycol et un acide di- ou tricarboxylique ou son alkyle ester de façon à préparer un prépolymère se présentant sous forme de particules solide uniformes possédant une viscosité intrinsèque comprise entre 0,1 et 0,3 dL/gm environ ainsi qu'une composition chimique caractérisée par un excès stoechiométrique d'alkylène glycol supérieur à 1 % par rapport à la quantité nécessaire produire un polymère de poids moléculaire élevé, puis à polymériser ledit prépolymère à l'état solide. Ledit procédé permet d'éviter l'étape de polycondensation à l'état fondu, sous pression réduite et à température très élevée.

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