Patent ID: 6437011
Filing Date: 2002-08-20
Classification: B01D,C08F,C08J,G01N,H01M,Y02E,Y02P

Abstract:
A composite membrane comprising a porous substrate impregnated with one or more polymeric compositions selected from the group consisting of:(a) a sulfonated copolymer of &agr;,&bgr;,&bgr;-trifluorostyrene and m-trifluoromethyl-&agr;,&bgr;,&bgr;-trifluorostyrene; (b) a sulfonated polymer of &agr;,&bgr;,&bgr;-trifluorostyrene; (c) a copolymer of &agr;,&bgr;,&bgr;-trifluorostyrene, m-trifluoromethyl-&agr;,&bgr;,&bgr;-trifluorostyrene and p-sulfonyl fluoride-&agr;,&bgr;,&bgr;-trifluorostyrene; (d) a sulfonated copolymer of &agr;,&bgr;,&bgr;-trifluorostyrene and p-fluoro-&agr;,&bgr;,&bgr;-trifluorostyrene; and (e) a copolymer of &agr;,&bgr;,&bgr;-trifluorostyrene, p-fluoro-&agr;,&bgr;,&bgr;-trifluorostyrene and p-sulfonyl fluoride-&agr;,&bgr;,&bgr;-trifluorostyrene.