| 摘要 |
1,161,513. Permselective membranes. ISRAEL, STATE OF. and A. SUSZER. 23 Sept., 1966 [24 Sept., 1965], No. 42490/66. Heading B5B. [Also in Divisions C3 and D2] Permselective membranes are made by bonding organic fibre-active molecules containing acidic or basic groups to a cellulosic sheet. The bonding comprises ether or ester links. The membranes exhibit permselectivity in a broad pH range. The permselectivity exceeds 14 mV in a cell containing N/10 to N/20 KCI, and the resistance < 20 ohm/cm<SP>2</SP>. Links are formed by (a) partially esterifying the sheet with isatoic anhydride or a derivative thereof, diazotizing the resultant anthranoyl ester of cellulose, and coupling an agent containing acidic or basic groups; (b) by the interaction of the cellulosic sheet with a halogenated N- containing heterocyclic compound which may contain at least one sulphonic acid group, or at least one basic group, which may be alkylated; (c) etherification of the cellulose with the dibasic salt of tris-#-sulphatoethylsulphonium inner salt; or (d) etherification with propane or butane sultone. The cellulosic sheet may be of regenerated cellulose or partially hydrolysed cellulose esters, e.g. cellulose acetate. |
