Process for manufacturing medium and high molecular weight...

C - Chemistry – Metallurgy – 08 – G

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C08G 63/78 (2006.01)

Patent

CA 2715055

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 atmospheric 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.

Cette invention concerne des polymères de polyesters de poids moléculaire moyen et élevé préparés sous forme de sirop à partir dun oligomère dester. Loligomère est converti en polymère par polycondensation à pression atmosphérique et à température élevée dans un support non réactif capable de former un azéotrope avec de leau. Loligomérisation de lester ou les réactions de polycondensation sont contrôlées si possible par une technique non-viscosimétrique. Le procédé a une durée de cycle rapide. Le sirop contient le polymère et le support non réactif, et peut être utilisé pour fabriquer des produits au départ non solides comme des revêtements à base de polyester de manière plus pratique quavec des résines de polyester solides sous forme de pastilles.

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