| 摘要 |
A self-supporting permselective anionic film comprises (a) a matrix of polyethylene, polyisobutylene, vulcanized natural or synthetic rubber, polyvinyl chloride or a copolymer of vinyl chloride and a vinyl ester of a lower aliphatic acid such as vinyl acetate, and (b) particles of an insoluble infusible anion-exchange resin intimately and uniformly dispersed throughout the matrix, the particles being of such a size as to pass through a U.S. Standard sieve No. 50. The anion-exchange resin is preferably present in an amount equal to 25 to 75 per cent of the total dry-weight of the film. The synthetic rubber may be polybutadiene, polyisoprene, neoprene or a copolymer of butadiene and styrene or acrylonitrile, and an example refers to the use of a matrix comprising a vinyl chloride-vinyl acetate copolymer and a linear polyester resin made from propylene glycol and sebacic acid. The anion-exchange resins may be made by condensing an aldehyde with an amine, with or without a phenol, as described in Specifications 450,309, 489,173, 556,622 and 557,414, or by chloralkylating an insoluble copolymer of a monovinyl aromatic hydrocarbon and a divinyl aromatic hydrocarbon and reacting the chloralkylated copolymer with an amine as described in Specification 654,706. Specification 719,315 also is referred to.ALSO:A self-supporting permselective anionic film comprises (a) a matrix of polyethylene, polyisobutylene, vulcanized natural or synthetic rubber, polyvinyl chloride or a copolymer of vinyl chloride and a vinyl ester of a lower aliphatic acid such as vinyl acetate, and (b) particles of an insoluble, infusible, anion-exchange resin intimately and uniformly dispersed throughout the matrix, the particles being of such a size as to pass through a U.S.A. Standard sieve No. 50 [see Group IV (a)]. Specifications 450,309, 489,173 [Group IV], 556,622, 557,414, 654,706 [Group IV(a)], and 719,315 are referred to.
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