The present invention relates to a method for producing a water-absorbing polymer, wherein (i) (α1) 0.1 to 99.999% by weight, preferably 20 to 99.99% by weight, more preferably 30 to 98.95% by weight. Ethylenically unsaturated acid group-containing monomers, salts thereof, ethylenically unsaturated monomers containing protonated or quaternized nitrogen or mixtures thereof (particularly preferably, at least ethylenically unsaturated acid group-containing monomers (preferably (Α2) 0 to 70% by weight, preferably 1 to 60% by weight, more preferably 1 to 40% by weight of ethylenically unsaturated copolymerizable with the component (α1). A monomer, (α3) 0.001 to 10% by weight, preferably 0.01 to 7% by weight, more preferably 0.05 to 5% by weight, and (α4) 0 to 30 % By weight, preferably Is 1 to 20% by weight, more preferably 5 to 10% by weight water-soluble polymer, and (α5) 0 to 20% by weight, preferably 0.01 to 7% by weight, more preferably 0.05 to 5% by weight. And (ii) free radical polymerization and crosslinking of the resulting mixture to form a water-insoluble solution, and a step of mixing the one or more auxiliaries with (a total of components (α1) to (α5) is 100 wt%) (Iii) drying the hydrogel polymer, (iv) pulverizing and sieving the hydrogel polymer, and (v) pulverizing and sieving. A step of surface post-crosslinking the performed hydrogel polymer, and (vi) a step of drying and final treatment of the water-absorbing polymer, before adding initiator and starting free radical polymerization. Of nonionic unsaturated polyether copolymer in an amount of 0.01 to 5% by weight, preferably 0.02 to 2% by weight, more preferably 0.07 to 1% by weight, based on the water-absorbing polymer. At least one surfactant selected from the group and optionally from 0.01 to 5% by weight, preferably from 0.02 to 2% by weight, more preferably from 0.07 to 1% by weight, 10% It relates to a method of mixing with a blowing agent having a particle size of ˜900 μm, to a water-absorbing pol
