Patent ID: 8633285
Filing Date: 2014-01-21
Classification: C08F

Abstract:
1. A process for producing water-absorbing polymer particles by polymerizing an aqueous monomer solution or suspension comprising a) at least one ethylenically unsaturated monomer which bears acid groups and 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 mentioned under a), and d) optionally one or more water-soluble polymers, comprising i) solution polymerization in a polymerization reactor to obtain a polymer, gel in the polymerization reactor, ii) addition of at least one solid additive during and/or after the solution polymerization to the polymer gel by means of at least one conveying screw ( iii) mixing the solid additive into the polymer gel, wherein a gas volume flow is additionally fed via the addition channel ( wherein the conveying screw (