| 摘要 |
1,199,668. Ion - exchange membranes. RHONE-POULENC S.A. 24 Sept., 1968 [25 Sept., 1967], No. 45369/68. Headings C3G and C3P. [Also in Divisions D1-D2] An ion-exchange membrane is formed of a vinyl chloride polymer or copolymer grafted with an aromatic vinyl monomer comprising an intranuclear or juxtanuclear tertiary nitrogen atom, or of a mixture of a vinyl chloride polymer or copolymer and a polymer of an aromatic vinyl monomer comprising an intranuclear or juxtanuclear tertiary nitrogen atom, all or part of the said tertiary nitrogen atoms having been quaternized by an alkylene or alkenylene dihalide or bis-(haloalkyl)-benzene. Specified aromatic vinyl monomers are vinyl pyridines and N,N-dialkylaminostyrenes. The polymer may be partially quaternized with the dihalide and the quaternization completed using a monofunctional quaternizing agent, e.g. an alkyl, cycloalkyl or aralkyl halide or sulphate. In the examples, (1) polyvinyl chloride is grafted with 4-vinylpyridine, the resulting graft polymer being quaternized with p-dodecylbenzyl chloride and bis - 1,4 - (chloromethyl) - benzene then treated with methyl iodide, (2) a membrane is formed as in Example 1, except that no dodecylbenzyl chloride is used, (3) a polyethylene glycol terephthalate fabric is soaked in a solution of the graft copolymer obtained in Example 1 and the supported film obtained is quaternized as in Example 1, (4) a solution of polyvinyl chloride and p-dimethylamino-styrene in cyclohexanone is poured on to glass, dried and then quaternized as in Example 2, (5) and (7) polyvinyl chloride and poly-p-dimethylaminostyrene are dissolved in cyclohexanone and a film formed from the solution is quaternized as in Example 2 and (6) a membrane reinforced with fabric is formed as in Example 3, using the solution of polymers prepared in Example 5. |
