Process for the production of an ion exchange membrane
AssigneeMitsubishi Petrochemical Co., Ltd.
InventorsNoriyoshi Tamura, Kunio Kihara
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Abstract
This invention relates to a process for the production of a heterogeneous ion exchange membrane having a high ion transport number in the presence of a high ion concentration, which comprises mixing a finely powdered ion exchange material with a crystalline polyolefin resin, forming the resultant mixture into a membrane-shaped article and treating the membrane-shaped article with an aqueous solution of at least one salt selected from alkali metal salts and ammonium salts, having a concentration of from 17% by weight to saturation, at a temperature of at least 80.degree. C. for at least 10 minutes.
Claims11
A process for preparing a heterogeneous ion exchange membrane having a high ion transport number in the presence of a high ion concentration, which comprises mixing 2-8 parts by weight of a finely powdered ion exchange resin with 2-8 parts by weight of a crystalline polyolefin resin, forming the resultant mixture into a membrane-shaped article and treating the membrane-shaped article with an aqueous solution of a salt component which is at least one member selected from the group consisting of alkali metal salts and ammonium salts, at a temperature of at least 80.degree. C. for at least 10 minutes, the concentration of said salt component in the aqueous solution being from 17% by weight to saturation.
Dependencies are inferred from the claim text.