Polymer recycling by selective dissolution

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 11/06 (2006.01) C08F 6/04 (2006.01) C08J 11/08 (2006.01)

Patent

CA 2065046

A method for separating polymers from a physically commingled solid mixture containing a plurality of polymers comprises dissolving a first one of the polymers in a solvent at a first lower temperature to form a first preferably single phase solution and a remaining solid component. The solid component contains additional polymers which are not solvable to the solvent at the first temperature but which may be soluble at higher temperatures. The method includes subsequently heating the solvent to dissolve additional polymer from the solid component to form subsequent solutions. The polymers are then separated from their respective solution either using flash evaporation techniques when more than one polymer has been dissolved at a single temperature, or conventional techniques for extracting a polymer from a solvent in a solution.

Procédé de séparation de polymères d'un mélange de solides physiquement entremêlés contenant une pluralité de polymères, consistant à dissoudre un premier polymère dans un solvant, à une première température basse afin de former une première solution de préférence monophase, et un premier composant solide restant. Ledit composant solide contient des polymères supplémentaires insolubles dans le solvant à la première température, mais soluble à des températures élevées. Le procédé consiste ensuite à chauffer le solvant afin de dissoudre un polymère supplémentaire provenant du composant solide, afin de former des solutions ultérieures. Les polymères sont ensuite séparés de leur solution respective, soit à l'aide de techniques d'évaporation éclair lorsque plus d'un polymère a été dissous à une seule température, soit selon des techniques classiques permettant d'extraire un polymère d'un solvant dans une solution.

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