Pulverulent, crosslinked polymers which absorb aqueous liquids and blood

Pulverulent polymer which is after-crosslinked on the surface, absorbs water, aqueous or serous liquids and bloods and comprises from

• a) 55-99.9 wt. % of polymerized, ethylenically unsaturated monomers which contain acid groups and are neutralized to the extent of at least 25 mol %,
• b) 0-40 wt. % of polymerized, ethylenically unsaturated monomers which can be copolymerized with a),
• c) 0.1-5.0 wt. % of one or more polymerized-in crosslinking agents,
• d) 0-30 wt. % of a water-soluble polymer
• the sum of the amounts by weight of a) to d) being 100 wt. %, wherein the polymer has been coated with
• e) 0.01 to 5 wt. %, based on the polymer, of at least one polyol as an agent for after-crosslinking of the surface in an aqueous solution;
• and
• f) 0.001-1.0 wt. %, based on the polymer, of a cation in the form of a salt dissolved in an aqueous solution and has been heated to an after-crosslinking temperature in the range of at least 150 to 250° C.,
• the weight ratio of the salt to the polyol being in the range from 1:0.8 to 1:4 and the total amount of aqueous solutions having been 0.5 to 10 wt. %, based on the polymer,
• excluding crosslinked partly neutralized polyacrylic acids which have been treated with Al2(SO4)3 and glycerol in a weight ratio of 1:1 or with Al2(SO4)3.16H2O and polyethylene glycol in a weight ratio of 1:1.8 or with Al2(SO4)3.14H2O and ethylene glycol in a weight ratio of 1:2 or with Al2(SO4)3.18H2O and ethylene glycol in a weight ratio of 1:2 or Al2(SO4)3.18H2O and propylene glycol in a weight ratio of 1:1.6.