Patent ID: 7629020

Claim:
A method for preparing an electrolyte membrane/electrode assembly for fuel cells, comprising the steps of: applying an electrolyte membrane composition comprising a radiation-curable liquid compound having proton conductivity onto a first electrode having a catalyst borne thereon to form a coating, irradiating the coating with radiation to form a cured film, and disposing a second electrode having a catalyst borne thereon contiguous to said cured film, said radiation-curable liquid compound having proton conductivity being a polyurethane (meth)acrylate oligomer obtained through a urethane-forming reaction of (a) a polyol component, (b) a polyisocyanate compound, and (c) a (meth)acrylate compound having a hydroxyl group, and having a number average molecular weight of about 200 to about 20, wherein said polyurethane (meth)acrylate oligomer is obtained by reacting the polyol component (a), the isocyanate compound (b) and the (meth)acrylate compound (c) having a hydroxyl group so that hydroxyl groups in the polyol component constitute about 0.1 to 0.8 mol, and the hydroxyl-bearing (meth)acrylate constitutes about 0.2 to 0.9 mol, per mol of isocyanate groups in the polyisocyanate.