Patent ID: 8507645
Filing Date: 2013-08-13
Classification: A61L,C08F

Abstract:
1. A process for continuously 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 may be at least partly neutralized, b) at least one crosslinker, c) at least one initiator, d) optionally one or more ethylenically unsaturated monomers copolymerizable with the monomers specified under a), and e) optionally one or more water-soluble polymers, in a continuous polymerization reactor to give a polymer gel, drying the resulting polymer gel, comminuting the dry polymer gel to give polymer particles and classifying the resulting polymer particles, wherein the amount of initiator c) used and/or the intensity of the UV radiation optionally used to initiate the polymerization are lowered by at least 10% within first 120 minutes after startup of the polymerization reactor.