Patent ID: 8461278
Filing Date: 2013-06-11
Classification: B01D,C08J

Abstract:
1. A process for producing water-absorbing polymer particles by polymerizing a monomer solution or suspension comprising a) at least one ethylenically unsaturated monomer which bears an acid group and optionally at least partly neutralized, b) at least one crosslinker, c) at least one initiator, d) optionally one or more ethylenically unsaturated monomer copolymerizable with the monomer mentioned under a), and e) optionally one or more water-soluble polymer, comprising drying, grinding, classifying, thermal surface postcrosslinking, and remoisturizing, which comprises performing the remoisturizing step in a continuous horizontal mixer with moving mixing tools, where the Froude number is at least 0.05, the water-absorbing polymer particles in the horizontal mixer have a starting temperature of at least 90° C., and the remoisturized water-absorbing polymer particles in the horizontal mixer are cooled to a temperature of less than 80° C.