Patent ID: 8603577

Claim:
A process for producing water-absorbing polymer particles comprising (i) polymerizing a monomer solution or suspension comprising a) at least one ethylenically unsaturated acid-bearing monomer which may be at least partly neutralized, b) at least one crosslinker, c) optionally one or more ethylenically and/or allylically unsaturated monomer copolymerizable with the monomer specified under a), and d) optionally one or more water-soluble polymer, (ii) drying, grinding, and classifying the polymer resulting from (i) to provide water-absorbing polymer particles, and (iii) coating the water-absorbing polymer particles with a particulate solid in a mixer, wherein the particulate solid is dispersed by means of a gas stream and a supply tube for the dispersed particulate solid in the mixer ends below a product bed surface.