A process for manufacturing polyester

C - Chemistry – Metallurgy – 08 – G

Patent

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C08G 63/80 (2006.01)

Patent

CA 2353681

The present invention refers to the production of a polyester-type polymer and more particularly to the solid phase condensation of a polyester. The invention presents a process for manufacturing polyester which comprises at least the following steps: a) esterifying of transesterifying a carboxylic diacid or a carboxylic acid diester with a diol, b) prepolymerizing the esterification or transesterification product in liquid phase until an average degree of polymerization between 10 and 50, preferably between 20 and 45, c) preparing a dispersion of the prepolymer in a non-solvent of diol and non- swelling of the prepolymer liquid, the prepolymer being present in the dispersion in the form of solid particles having diameters under 2 mm and crystallized, with a crystalline lamella thickness under 17 nm, d) polymerizing in dispersed solid phase, e) recovering solid particles. The accomplishment of a dispersed solid phase polymerization permits improving the reaction kinetics. To obtain this improvement, the dispersed solid phase polymerization must be effected with a prepolymer having a particular degree of polymerization properties, of solid particle sizes and of crystalline qualities of the solid.

L'invention concerne la production d'un polymère du type polyester et, plus précisément, la condensation en phase solide d'un polyester. Elle concerne un procédé de fabrication du polyester, qui consiste au moins (a) à estérifier ou à transestérifier un diacide carboxylique ou un diester d'acide carboxylique avec un diol; (b) à prépolymériser le produit d'estérification ou de transestérification en phase liquide jusqu'à un degré de polymérisation se situant entre 10 et 50, de préférence, entre 20 et 45; (c) à préparer une dispersion du prépolymère dans un milieu non solvant de diol et non gonflant du liquide prépolymère, ce dernier étant présent dans la dispersion sous la forme de particules solides, de diamètre inférieur à 2 mm, et en cristaux, d'une épaisseur de lamelle cristalline inférieure à 17 nm; (d) à polymériser en phase solide; (e) à récupérer les particules solides. La réalisation d'une polymérisation en phase solide dispersée permet d'améliorer la cinétique de réaction. Pour réaliser cette amélioration, ladite polymérisation doit être effectuée avec un prépolymère ayant un degré particulier de propriétés de polymérisation, de dimensions de particules solides et de qualités cristallines du solide.

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