| 摘要 |
PURPOSE:A fluororesin cation exchange membrane, consisting of a specific multi- layer structure consisting essentially of a carboxylic acid type perfluorocarbon polymer membrane as a principal layer, capable of producing caustic soda and chlorine of high quality with a low resistance and high current efficiency, and useful for electrolyzing sodium chloride. CONSTITUTION:A fluororesin cation exchange membrane, obtained by laminating and integrating a membrane, consisting of a carboxylic acid type perfluorocarbon polymer having 1.4-2 milliequivalents/g dried resin ion exchange capacity, and having 50-250mum thickness as a principal layer with a surface membrane layer, consisting of a sulfonic acid type fluorocarbon polymer having 0.5-1.5 milliequivalents/g dried ion exchange capacity, and having 5-50mum thickness on one surface of the above-mentioned principal layer and a surface membrane layer, consisting of a carboxylic acid type perfluorocarbon polymer having 0.5- 1.3 milliequivalents/g dried resin ion exchange capacity, and having 5-50mum thickness on the other surface of the above-mentioned principal layer. A coexisting membrane layer consisting of a blend of the carboxylic acid type perfluorocar-bon polymer with the sulfonic acid type perfluorocarbon polymer is placed in the interlayer and integrated therewith if necessary.
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