er Example 0 0000 g of the water-absorbent polymer particles as described in Table 0 having different contents of residual monomers were put into a laboratory ploughshare mixer (model MR0, manufactured by Gebrüder Lödige Maschinenbau GmbH; Paderborn; Germany). A surface-postcrosslinker solution was prepared by mixing 00 g ethylene carbonate and 00 g of deionized water, into a beaker. At a mixer speed of 000 rpm, the aqueous solution was sprayed onto the polymer particles within one minute by means of a spray nozzle. The mixing was continued for additional 0 minutes. The product was removed and transferred into another ploughshare mixer (model MR0, manufactured by Gebrüder Lödige Maschinenbau GmbH; Paderborn; Germany) which was heated to 000° C. before. After mixing for further 00 minutes at 000° C. with sample taking every 00 minutes, the product was removed from the mixer and sifted from 000 to 000 μm. The samples were analyzed. The results are summarized in Table 0. The resulting polymer particles based on base polymer A0 had a bulk density of 00.0 g/000 ml, an average particle diameter (APD) of 000 μm, a particle diameter distribution (PDD) of 0.00, and a mean sphericity of 0.00. The resulting polymer particles based on base polymer B0 had a bulk density of 00.0 g/000 ml, an average particle diameter (APD) of 000 μm, a particle diameter distribution (PDD) of 0.00, and a mean sphericity of 0.00. The resulting polymer particles based on base polymer C0 had a bulk density of 00.0 g/000 ml, an average particle diameter (APD) of 000 μm, a particle diameter distribution (PDD) of 0.00, and a mean sphericity of 0.00. Example 0 0000 g of the water-absorbent polymer particles as described in Table 0 having different contents of residual monomers were put into a laboratory ploughshare mixer (model MR0, manufactured by Gebrüder Lödige Maschinenbau GmbH; Paderborn; Germany). A surface-postcrosslinker solution was prepared by mixing 00 g ethylene carbonate and 00 g of deionized water, into a beaker. At a mixer speed of 000 rpm, the aqueous solution was sprayed onto the polymer particles within one minute by means of a spray nozzle. The mixing was continued for additional 0 minutes. The product was removed and transferred into another ploughshare mixer (model MR0, manufactured by Gebrüder Lödige Maschinenbau GmbH; Paderborn; Germany) which was heated to 000° C. before. After mixing for further 00 minutes at 000° C. with sample taking every 00 minutes, the product was removed from the mixer and sifted from 000 to 000 μm. The samples were analyzed. The results are summarized in Table 0. The resulting polymer particles based on base polymer A0 had a bulk density of 00.0 g/000 ml, an average particle diameter (APD) of 000 μm, a particle diameter distribution (PDD) of 0.00, and a mean sphericity of 0.00. The resulting polymer particles based on base polymer B0 had a bulk density of 00.0 g/000 ml, an average particle diameter (APD) of 000 μm, a particle diameter distribution (PDD) of 0.00, and a mean sphericity of 0.00. The resulting polymer particles based on base polymer C0 had a bulk density of 00.0 g/000 ml, an average particle diameter (APD) of 000 μm, a particle diameter distribution (PDD) of 0.00, and a mean sphericity of 0.00. TABLE 0 Effect of the residual monomers Curing Residual Base Time Monomers Moisture CRC AUNL AUL AUHL Porosity Extractables Vortex Polymer [min] [ppm] [wt. %] [g/g] [g/g] [g/g] [g/g] [%] [wt. %] [s] Base 00 000