| 摘要 |
Process for reducing the content of water-soluble salts of aqueous solutions of polymers containing vinylamine groups by ultrafiltration to achieve a residual salt content of 1 to 10% by weight based on total solution solids in the polymer solution comprising feeding an aqueous salt-containing solution of vinylamine group containing polymers at a polymer concentration of at least 7% by weight to an ultrafiltration unit and removing the water-soluble salts with the permeate from the feed solution by adding thereto less than 4 parts by weight of water per one part by weight of the feed solution, and use of the polymer of the aqueous solutions thus purified as basic water-absorbing resin of multicomponent superabsorbent polymers. Preferably vibratory shear membranes in a diafiltration configuration are used. |
