| 摘要 |
PURPOSE:To obtain the title membrane excellent in low resistance, mechanical strength and bondability, by laying a second layer comprising a specified polymer upon the anode side of a first layer comprising a specified polymer and forming continuous micropores reaching from the anode side surface of the second layer to the interface between said first and second layers in said second layer. CONSTITUTION:A 5-50mu-thick second layer of a fluorine-containing polymer having an ion exchange capacity of sulfonic acid groups of 0.6-1.3meq/g dry resin is laid upon the anode side of a 50-500mu-thick first layer of fluorine-containing polymer having an ion exchange capacity of carboxylic acid groups of 0.8-2meq/g dry resin, and the both are bonded together by application of heat and pressure at 100-350 deg.C and 0.2-100kg/cm<2>. A layer of particles is formed on the anode side surface of the second layer by adhering thereto 10-50mum particles of, e.g., an epoxy resin. this layer is forced to advance into the second layer by application of pressure until it reaches the interface between the first and second layers, and the particles are dissolved by using, for example, a solmvent to form continuous micropores of a pore diameter of 1-70mum and a depth of 5-100mum (porosity of 1-50%). In this way, the title fluorine-containing cation exchange membrane for electrolysis can be obtained.
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