Methods for removing contaminants from polymers

Details Methods for removing contaminants from polymers Methods for removing contaminants from polymers

C - Chemistry, Metallurgy

08

J

C08J 11/08 (2006.01) B29B 17/02 (2006.01) B29C 47/76 (2006.01) C08F 6/00 (2006.01)

Patent

CA 2219217

- 28 - METHODS FOR REMOVING CONTAMINANTS FROM POLYMERS The present invention relates to a method for treating plastic polymers to reduce or remove organic contaminants. More particularly, the present invention relates to a method of treating , by continuous means, a flowable polymer mass with a solvating fluid in an environment at which the solvating fluid is in a supercritical state and is subject to conditions sufficient to preferentially solvate and extract organic, and especially non-volatile, contaminants from the polymer mass.

La présente invention concerne une méthode pour traiter des polymères plastiques pour réduire ou éliminer les contaminants organiques. Plus particulièrement, la présente invention concerne une méthode de traitement, par un moyen continu, d'une masse polymérique fluidifiable avec un fluide de solvatation dans un environnement dans lequel le fluide de solvatation est à l'état supercritique et est soumis à des conditions suffisantes pour solvater et extraire préférentiellement les contaminants organiques, surtout les contaminants non volatils, de la masse polymérique.

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