| abstract |
The invention relates to powdery absorption agents for water and aqueous liquids based on water-swellable but not water soluble polymerisates which are cross-linked and comprise monomers carrying partially neutralised, monoethylenically unsaturated acid groups, optionally other monomers copolymerisable therewith and optionally polymers suitable as a graft base. Said polymerisates are prepared using a cross-linker combination from I. 40-90 % by moles of CH2=CHR<5>-CO-(OCHR<3>-CHR<3>)zO-CH2-CHR<5>=CH2 and II. 10-60 % by moles of R<1>-[O(CHR<3>-CHR<3>O)u-CO-R<2>]x, where R<1> is a polyvalent C2-10-alkyl, R<2> is a linear or branched C2-10 alkenyl, R<3> is H, CH3, C2H5, R<5> is H, CH3, x is 2-6, u is 0-15, z is 3-20. Subsequent surface cross-linkage results in a property combination of a high level of retention, a high level of absorption under pressure, a low number of soluble components and rapid fluid absorption. The polymerisates are used in structures such as nappies for absorbing body fluids, in cables conducting current or light, or for growing plants. |