| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrolyte membrane of which proton conductivity is improved, which has a stable membrane structure, and of which a methanol permeation inhibition property is sufficient, and to provide a solid polymer fuel cell using it. SOLUTION: This is the electrolyte membrane containing an electrolyte polymer in which a polymer having proton conductive groups is cross-linked by di-vinylbenzene sulfonic acid or its salt, and this is preferably composed by filling the electrolyte polymer into fine pores of a porous base material. Especially, it is preferable that the porous base material is that in which a resin composition is cross-linked which contains a first polymer containing polyethylene of weight average molecular weight of 5 hundred thousand or more and a second polymer having reactive functional groups. COPYRIGHT: (C)2008,JPO&INPIT
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