Patent ID: 8664151

Claim:
An absorbent article comprising superabsorbent polymer particles, the particles comprising a film or coating containing a polyurethane polymer material, the polyurethane polymer material being produced by the process of: a) obtaining a dispersion or solution of a polyurethane polymer or pre-polymer in a liquid; b) i) adding silica-containing material modified to be capable of covalently bonding to the polyurethane polymers or pre-polymers to the dispersion or solution of step a), the material then covalently bonding to the polyurethane polymers or pre-polymers; or ii) adding a silica-containing material to the dispersion or solution of step a) and adding a modification material that modifies the silica-containing material to be capable of covalently bonding to the polyurethane polymers or pre-polymers to the dispersion or solution, and thereby obtaining a modified silica-containing material, the resulting material then covalently bonding to the polyurethane polymers or pre-polymers; and c) adding a further silica to the dispersion or solution simultaneously with step a) or step b), or subsequently to step b), the further silica not being modified to be capable of covalently bonding to the polyurethane polymers or pre-polymers; wherein the modified silica-containing material is modified fumed silica.