Ion exchange membrane for alkali chloride electrolysis, its manufacturing method and alkali chloride electrolyzer

摘要

To provide an ion exchange membrane for alkali chloride electrolysis whereby it is possible to make the electrolysis voltage low and the current efficiency high at the time of performing electrolysis of an alkali chloride; a method for its production; and an alkali chloride electrolysis apparatus using it. The ion exchange membrane for alkali chloride electrolysis has a layer (C) comprising a fluorinated polymer having carbonic acid functional groups, and a layer (S) comprising a fluorinated polymer having sulfonic acid functional groups; a reinforcing material containing reinforcing threads is disposed in the layer (S); and when measured after the ion exchange membrane for alkali chloride electrolysis is immersed and held in a 32 mass% sodium hydroxide aqueous solution warmed at 90°C for 16 hours and subsequently immersed in a 32 mass% sodium hydroxide aqueous solution at 25°C for 3 hours, the AC resistance value A of the layer (S) and the AC resistance value B of the layer (C) satisfy the following formulae at the same time: 1 (©·cm 2 ) ‰¦ A ‰¦ 10(©·cm 2 ) and 200(©·cm 2 ) ‰¦ B ‰¦ 450(©·cm 2 ).