Patent ID: 7981969

Claim:
A water-absorbing polymer having a saline flow conductivity of not less than 80×10 −7 cm 3 s/g and comprising not less than 80% by weight of particles between 150 and 600 μm in size, said polymer prepared by a process comprising mixing a base polymer A 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 50% 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, and wherein said base polymer A has a deagglomerating assistant added to it in an amount of up to 0.01% by weight.