Patent ID: 7655830

Claim:
Superabsorbent polymer particle comprising a precursor superabsorbent polymer particle comprising cross-linked poly(meth)acrylic acid and salts thereof, said precursor superabsorbent polymer particle comprising aliphatic C—H groups, and said precursor superabsorbent polymer particle having a surface and a core, and at least two different functionalizers covalently bonded to said surface of said precursor superabsorbent polymer particle, said functionalizers each comprising a functional unit and a grafting unit, said functional unit being covalently bonded to said grafting unit, said functionalizers differing with respect to their grafting unit, said functional unit having a molecular weight of up to 1000 and comprising chemical structures which are not present in said precursor superabsorbent polymer particle, said functional units adding an additional function to said precursor superabsorbent polymer particle or modifying an existing function of said precursor superabsorbent polymer particle, wherein said grafting unit of said functionalizer is covalently bonded to one of said aliphatic C—H groups comprised in said precursor superabsorbent polymer particle.