| 摘要 |
PURPOSE:To obtain an ion exchange membrane having a high current efficiency, a low electric resistance and excellent mechanical strength, by treating a laminate of a porous layer having a coating of an inorganic (hydr)oxide on its surface or in its inside with a specified ion exchange layer with an aqueous alkali solution. CONSTITUTION:A porous body of a pore diameter of 0.05-10mu, a porosity of 30-955 and a thickness of 60-300mu, obtained by molding a fluorine- containing polymer containing a liquid lubricant into a film and stretching this film uniaxially or multiaxially at a stretch ratio of 1.1-10 is impregnated with a water/alcohol mixed solution containing 1-50wt% inorganic (hydr)oxide or its precursor to obtain a porous body having a coating of the inorganic (hydr)oxide or its precursor on its surface or inside. This porous body layer is laminated with an ion exchanger having functional groups of formulas I and/or III (wherein R is H, a 1-10C alkyl and R' is -F or -OH), and the obtained laminate is treated with an aqueous alkali solution containing the same cations as those of said (hydr)oxide to convert the functional groups into -COOM or -SO3M groups (wherein M is an alkali metal). |
