Patent ID: 6831142
Filing Date: 2004-12-14
Classification: A61L,C08F,C08J,C08L

Abstract:
Pulverulent polymer which is after-crosslinked on the surface, absorbs water, aqueous or serous liquids and bloods and comprises froma) 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, ethylencially 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 250Â° 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 16HO and polyethylene glycol in a weight ration of 1:1.8 or with Al2(SO4)3Â·14H2O and ethylene glycol in a weight ratio of 1:2 or with Al2(SO4)3Â·18H2O and ethylene glycol in a weight ratio of 1:2 or Al2(SO4)319 18H2O and propylene glycol in a weight ratio of 1:1.6.