| 摘要 |
1,049,549. Laminates. IONICS Inc. July 5. 1965 [July 22, 1964], No. 28312/65. Heading B5N. An ion-exchange membrane comprises at least one layer of a preferably open-structure woven fabric of synthetic or mineral fibres and at least one unwoven layer of such fibres, the latter being an outer layer, the layers being impregnated with a polymerizable resin mix converted or convertible into an ion-exchange resin. Preferably one woven layer sandwiched between two unwoven layers are used. The fibres of the layers may be of polyester, polyamide, polyacrylic, polyvinylidene chloride, polypropylene or P.T.F.E. resins, or rayon, or glass or asbestos, or mixtures of such fibres. The resin mix may comprise divinyl benzene cured with benzoyl peroxide and treated subsequently with chlormethyl ether, being then converted into a quaternary ammonium salt with aqueous trimethylamine to produce an anionexchange resin, or treated with H 2 SO 4 to produce a cation-exchange material. Impregnation may be effected by pouring the mix on to the assembly of layers between glass plates. |
