| abstract |
PCT No. PCT/EP96/05074 Sec. 371 Date May 20, 1998 Sec. 102(e) Date May 20, 1998 PCT Filed Nov. 18, 1996 PCT Pub. No. WO97/18890 PCT Pub. Date May 29, 1997The present invention relates to powdery absorbents for water and aqueous liquids, which are based on water-swellable, but not water-soluble, polymers, are cross-linked, and are built up of partially neutralized, monoethylenically unsaturated, acid groups-containing monomers, optional further monomers copolymerizable with these, and optional polymers suitable as a graft basis. These polymers are produced by using a cross-linker combination consisting of CH2=CR5-CO-(OCHR3-CHR3)zO-CH2-CR5=CH2 I. R1-[O(CHR3-CHR3O)u-CO-R2]x II. with R1: multivalent C2-10-alkyl, R2: linear or branched C2-10-alkenyl, R3: H, CH3, C2H5, R5: H, CH3, x: 2-6, u: 0-15, z: 3-20 and a secondary cross-linker. Superficial secondary cross-linkage achieves a property combination of high retention, high absorption under pressure, low soluble contents, and a rapid liquid absorption. The polymers are used in constructions, such as diapers, for the absorption of body fluids, in current-conducting or light-transmitting cables, and in the cultivation of plants. |