Patent ID: 8258223

Claim:
A process for producing a water-absorbing polymer comprising a base polymer A being mixed with a first aqueous solution B of at least one surface postcrosslinker capable of forming covalent bonds with carboxyl groups and a second aqueous solution C of at least one polyvalent cation and thermally treated, wherein said base polymer A is based on an at least 70% neutralized acid-functional monomer and said solutions B and C are metered wholly or partly concurrently through separate nozzles, the concentration of the at least one surface postcrosslinker on said base polymer A being in the range from 0.01% to 0.5% by weight and the concentration of the at least one polyvalent cation on said base polymer A being in the range from 0.001% to 0.5% by weight, based in each case on said base polymer A, wherein said base polymer A has a deagglomerating assistant added to it, and wherein the deagglomerating assistant is metered such that the surface tension of an aqueous extract of the swollen water-absorbing polymer after addition of said deagglomerating assistant is at least 0.065 N/m.