| abstract |
PROBLEM TO BE SOLVED: To have excellent physical strength, to have low membrane resistance, to stably maintain ionic conductivity for a long period of time, and to stabilize high battery output when used as a direct methanol fuel cell membrane. To provide an ion-exchange membrane obtainable by the above method, and a method for efficiently producing the ion-exchange membrane. SOLUTION: A porous membrane (for example, a porous stretched film made of polyethylene) 9 having pores having an average pore diameter in a range of 0.01 to 2 μm is used as a base material, and at least one surface of the membrane has primary particles. The average value of the major axis is an ion exchange membrane having a layer 12 containing an inorganic filler 11 and an ion exchange resin 10 that is 0.1 times or more and 50 μm or less of the average pore diameter of the pores of the porous membrane. . A porous film serving as a base material is contacted with a suspension of a polymerizable monomer such as styrene and an inorganic filler, and the polymerizable monomer is impregnated into the pores of the porous film and then polymerized. And by further introducing an ion exchange group. [Selection] Fig. 2 |