Solvent extraction of low molecular weight components from...

C - Chemistry – Metallurgy – 08 – F

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C08F 6/00 (2006.01) C08F 6/28 (2006.01)

Patent

CA 2421666

A method for the removal of low molecular weight components from solid polymer resins and articles is provided. According to the method, low molecular weight components are solvent extracted from polymers, preferably in a continuous process, optionally facilitated by ultrasonification, heat, or both, wherein the polymers are comprised generally of ethylenic backbones having pendant groups selected from alkyl acrylate groups, cyclic olefinic groups, and/or benzylic groups. The solid polymer resins so treated can meet FDA requirements for food packaging applications.

L'invention porte sur un procédé d'extraction de composants de faible poids moléculaire contenus dans des résines solides de polymères, et d'articles en étant faits, selon lequel lesdits composants sont extraits à l'aide de solvants, de préférence dans un processus continu facilité par l'utilisation d'ultrasons, de chaleur ou des deux. Lesdits polymères sont généralement constitués de squelettes éthyléniques présentant des groupes pendants sélectionnés parmi des groupes d'acrylate d'alkyle, d'oléfines cycliques, et/ou benzyliques. Les résines de polymères ainsi traitées satisfont aux normes de la FDA relatives à l'emballage des produits alimentaires.

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