| 摘要 |
PURPOSE:To obtain the titled low-cost exchange membrane exhibiting high electrical current efficiency and low electrolytic voltage stably for a long period, in high efficiency, by contacting a fluorocarbon polymer having specific atomic group at side chain with a reducing agent, and forming to a film. CONSTITUTION:(A) A fluorocarbon polymer having the atomic group of formula II (X is F, Cl, H, M or OM; M is H, metal or NH4; m is 3-5) at (a part of) side chains and obtained by the polymerization of a fluorinated olefin (pref. tetrafluoroethylene) and a sulfur-containing fluorinated vinyl ether (e.g. the compound of formulaI) is made to react with (B) usually a large excess of a reducing agent (pref. lithium aluminum hydride, etc. when the atomic group is surfonic acid group) pref. at 0-150 deg.C. The product is molten and formed to a film or membrane by calendering, etc. to obtain the objective exchange membrane having a layer containing the atomic group of formula III (M' is H, metal or NH4) at (a part of) the side chains. |
