Patent ID: 8153329

Claim:
A proton-conducting electrolyte membrane comprising a porous inorganic substrate, a porous portion of the porous inorganic substrate being filled with a proton-conducting polymer, wherein the proton-conducting polymer is a co- polymer derived from: (i) p-styrene sulphonic acid; and (ii) a silyl compound represented by Formula (1): (R 1 O) n --Si--R 2 m Formula (1), wherein R 1 is an alkyl group of 1 to 4 carbon atoms; R 2 is selected from the group consisting of an a methacryloxy group, and an acryloxy group, m and n each are an integer of 1 to 3 with the proviso that m plus n equals 4, and R 2 may be the same or different when m is 2 or 3.