Patent ID: 8846565
Filing Date: 2014-09-30
Classification: A61L

Abstract:
1. A water absorbing material prepared by a process comprising bringing particles of a non surface-crosslinked water-absorbing polymer in contact with a) at least one postcrosslinker, b) 10-1000 ppm, based on the non surface-crosslinked water-absorbing polymer, of at least one nitrogen atom-containing water-soluble polymer of which the nitrogen atom can be protonated, and c) 0.001-0.5 wt %, based on the non surface-crosslinked water-absorbing polymer, of at least one hydrophobic polymer selected from the group consisting of a polyurethane, a poly(meth)acrylate, a polyacrylate, a copolymer of styrene-(meth)acrylate, a copolymer of styrene and (meth)acrylate comprising acrylonitrile, a copolymer of butadiene styrene and acrylonitrile, a (co)polymer of (crosslinkable) N-vinylpyrrolidone, and a (co)polymer of vinylacetate and heat-treating the resulting particles at a temperature in a range from 120° C. to 300° C.