Patent ID: 7572864

Claim:
An absorption agent for water, or aqueous liquids, or blood in constructions for absorbing body fluids, comprising pulverulent polymer which absorbs water, aqueous, or serous liquids as well as blood, which is post-cross-linked on the surface and is synthesized from the following elements: a) from about 55 to about 99.9 wt. % polymerized, ethylenically unsaturated, acid groups-containing monomers which are at least about 25 mol % neutralized, b) from 0 to about 40 wt. % polymerized, ethylenically unsaturated monomers which are copolymerizable with a), c) from about 0.1 to about 5 wt. % of one or more polymerized cross-linking agents, d) from 0 to about 30 wt. % of a water-soluble polymer, wherein the sum of the quantities a) to d) by weight is 100 wt. %, wherein the polymer is coated and post-cross-linked, with heating, with e) from about 0.01 to about 5 wt. %, in relation to the polymer, of an organic surface post-cross-linking agent, with the exception of polyols, in the form of an aqueous solution and with f) from about 0.001 to about 1 wt. %, in relation to the polymer, of a trivalent or a higher-valent cation in the form of a salt dissolved in an aqueous solution, wherein the total quantity of water of the coating solution is from about 0.5 to about 10 wt. %, in relation to the polymer, and the ratio by weight of the salt to the post-cross-linking agent is within the range from about 1:0.8 to about 1:4, wherein the amount of the polymer in certain regions of the construction is within the range from about 60 to 100 wt. %.