METHOD FOR SEPARATING AT LEAST ONE SELECTED POLYMER FROM A MIXTURE OF POLYMERS

摘要

The present invention provides a method for separating one or more selected polymer(s) from a mixture of polymers, as well as the recycled solid polymer product produced by the present method of the invention. One method of the present invention involves dissolving a mixture of polymers in a solvent to produce a solution, then cooling the solution to a temperature at which at least one of the selected polymers precipitates in the form of a solid. The solid is then separated from the suspension before being washed in a solvent at a temperature that is higher than the dissolving temperature, in order to produce a washed solid. The washed solid is separated from the second solvent. In one variant of the method, the suspension produced in the cooling step is treated with an added solvent.