Process for continuously producing water-absorbing polymer particles

摘要

A process for continuously producing water-absorbing polymer particles by polymerizing a monomer solution comprising acrylic acid and/or salts thereof, wherein the acrylic acid supplied has a dimeric acrylic acid content of at least 0.02% by weight and the dimeric acrylic acid content is kept essentially constant.

主权项

1. A process for continuously producing water-absorbing polymer particles, comprising polymerization of a monomer solution or suspension comprising
a) acrylic acid which may be at least partly neutralized, b) at least one crosslinker, c) at least one initiator, d) optionally one or more ethylenically unsaturated monomer copolymerizable with acrylic acid, and e) optionally one or more water-soluble polymer, to give a polymer gel, drying the resulting polymer gel, comminution of the dried polymer gel to give polymer particles, and classifying the resulting polymer particles, wherein the acrylic acid is supplied continuously and the acrylic acid supplied continuously has a dimeric acrylic acid content of 0.02% to 1% by weight and the dimeric acrylic acid content is kept essentially constant.