Patent ID: 7271228

Claim:
A dialysis system or a two-phase reactor or a fuel cell containing a membrane comprised of a crosslinked copolymer of at least two ionic compounds in which the negative charge is highly delocalized, corresponding to the formula [CF 2 ═CF-A − ] m M m+ in which: M m+ is a proton or a metal cation having the valency m chosen from alkali metal, alkaline earth metal, transition metal or rare earth metal ions or an organic onium cation or an organometallic cation, 1≦m≦3; A is wherein D represents a single bond, an oxygen atom, a sulfur atom, a —CO—carbonyl group or an —SO 2 — sulfonyl group; the groups X 1 to X 4 , hereinafter denoted by X i , represent N, C—C≡N, CR, CCOR or CSO 2 R, it being understood that, in a pentacyclic group, the X i groups can be identical or different; R represents Y, YO—, YS—, Y 2 N—, F, R F ═C q F 2q+1 (0≦q≦12), CF 2 ═CF—, CF 2 ═CFCF 2 —, CF 2 ═CF—O—, CF 2 ═CF-Φ or CF 2 ═CF—O-Φ-, it being understood that, if two R substituents are present on the same group, they can be identical or different; Φ represents a condensed or noncondensed aromatic group, optionally having one or more substituents and optionally including heteroatoms, or a polyhalogenated group —C 6 H (4-x-y) F x Cl y — (1≦x+y≦4); Y represents H or a monovalent organic radical having from 1 to 16 carbon atoms chosen from alkyl, alkenyl, oxaalkyl, oxaalkenyl, azaalkyl, azaalkenyl, aryl or alkylaryl radicals or from the radicals obtained from the abovementioned radicals by substitution, in the chains and/or the aromatic part, by heteroatoms, it being understood that, if sulfur or phosphorus are present, they can optionally be bonded to substituted nitrogen or oxygen atoms, or else Y is a repeat unit of a polymeric backbone; and at least one of the ionic compounds carries only one CF 2 ═CF 2 — group and at least one of the ionic compounds carries only two CF 2 ═CF 2 — groups.