Patent ID: 9574019
Date: 2017-02-21
CPC Classifications: A61L,C08F,C08J,C08L

Claim:
1. A process for producing water-absorbing polymer particles by polymerizing a foamed aqueous monomer solution or suspension comprising a) at least one ethylenically unsaturated monomer which bears an acid group and has been neutralized to an extent of 25 to 95 mol %, b) at least one crosslinker, c) at least one initiator, and d) at least one surfactant, the monomer solution or suspension being polymerized to a polymeric foam and predried to a water content of 5 to 30%, by weight, which comprises subsequently grinding the predried polymeric foam, drying the resulting water-absorbing polymer particles, and classifying the resulting water-absorbing polymer particles.