Patent ID: 9162190
Filing Date: 2015-10-20
Classification: B01D,C08J

Abstract:
1. A process for preparing a composite membrane comprising the following steps: 1) preparing a liquid dispersion, the liquid dispersion comprising a solvent and a (per) fluorinated ionomer, in acid or salified form, wherein the ionomer concentration is between 0.5% and 40% by weight; 2) depositing the dispersion obtained in 1) on the surfaces of a porous first support and removing excess dispersion to obtain a film or layer, of impregnated porous material; 3) applying a non-porous second support which is inert under the conditions of the process to one side of the film or layer of the impregnated porous material; 3a) optionally removing the solvent from the film or layer of the impregnated porous material positioned on the non-porous second support; 4) annealing the film or layer of impregnated porous material as applied to the non-porous second support at temperatures from 130° to 280° C.; and 5) detaching the film or layer of impregnated porous material from the non-porous second support to obtain a membrane.