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AssigneeBASF SE
InventorsUlrich Riegel, Thomas Daniel, Matthias Weismantel, Mark Elliott, Dieter Hermeling
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The invention concerns a process for producing water-absorbing polymer, which comprises a base polymer A being mixed with a first aqueous solution B of at least one surface postcrosslinker and a second aqueous solution C of at least one polyvalent cation and thermally treated, wherein said base polymer A is based on at least 50% neutralized acid-functional monomer and said solutions B and C are metered wholly or partly concurrently through separate nozzles whereby a water-absorbing polymer having a high saline flow conductivity value is obtained.
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 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.
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Dependencies are inferred from the claim text.