| abstract |
The invention relates to a cross-linked, water-absorbent polymer obtainable by the polymerisation of a mixture consisting of a) 60 - 99 % wt. unsaturated, polymerisable monomers with acid groups which are neutralised to the extent of at least 30 mol %, b) 0 - 37 % wt. monomers copolymerisable with a), c), 0.1 - 3.0 % wt. of a cross-linking agent and d) 0 - 10 % wt. of a water-soluble polymer, in which polymerisation is brought about with a redox catalyst system containing formamidine sulphinic acid. The polymer is distinguished by a retention of over 28 g 0.9 % aqueous NaCl solution per 1 g of polymer, an absorption of more than 26 g 0.9 % aqueous NaCl solution per 1 g of polymer at a load of 20 g/cm?2 and a residual monomer content of less than 700 ppm and preferably less than 500 ppm. The invention also relates to the use of this polymer in the production of hygiene items. |