 had a bulk density of 00.0 g/000 ml and a flow rate of 00.0 g/s. Example 00 0000 g of the water-absorbent polymer particles prepared in Example 0b (base polymer) having a content of residual monomers of 0000 ppm 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 0 g of 