| 摘要 |
A cation-exchange resin for use in a primary or secondary electric cell (see Group XXXVI) is prepared, according to one example, by reacting an aqueous formaldehyde solution with an aqueous phenol sulphonic acid solution. The resin is then finely ground, mixed with finely divided polyethylene and pressed into sheets or membranes. In another example, a resin is prepared by chlorosulphonation of a styrenedivinyl benzene polymer and is mixed with polyethylene. The solvating water may be removed from either resin, by treatment in vacuo, and replaced by an aliphatic alcohol, e.g. methanol, ethanol, ethylene glycol, propylene glycol, or glycerine. Specifications 577,707, 590,883 and 590,884 are referred to. |
