Process for manufacturing medium and high molecular weight...

C - Chemistry – Metallurgy – 08 – L

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C08L 67/00 (2006.01) B65D 85/72 (2006.01) C08J 3/09 (2006.01) C08L 67/02 (2006.01)

Patent

CA 2715262

Medium and high molecular weight polyester polymers are prepared in syrup form from an ester oligomer. The oligomer is converted to the polymer by polycondensation at elevated pressure and elevated temperature in a nonreactive carrier capable of forming an azeotrope with water. The ester oligomerization or polycondensation reactions desirably are monitored using a non-viscometric technique. The process has a rapid cycle time. The syrup contains the polymer and nonreactive carrier, and may more conveniently be used to make initially non-solid products such as polyester coatings than is the case when employing pelletized solid polyester resins.

L'invention concerne des polymères de polyester à poids moléculaire élevé qui sont préparés sous la forme de sirop à partir d'un oligomère d'ester. L'oligomère est converti en polymère par une polycondensation à pression élevée et à température élevée dans un porteur non réactif capable de former un azéotrope avec de l'eau. Les réactions d'oligomérisation ou de polycondensation d'ester sont de préférence surveillées en utilisant une technique non viscométrique. Le procédé a une durée de cycle rapide. Le sirop contient le polymère et le porteur non réactif, et peut être utilisé commodément pour fabriquer initialement des produits non solides, tels que des revêtements de polyester, de manière appropriée que lorsqu'on utilise des résines polyester solides pellétisées.

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