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US 8,507,645 B2Granted
Process for continuously producing water-absorbing polymer particles
AssigneeBASF SE
InventorsRüdiger Funk, Thomas Pfeiffer, Karl J. Possemiers
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Abstract
A process for continuously producing water-absorbing polymer particles, in a continuous polymerization reactor, wherein the amount of initiator used and/or the intensity of the UV radiation optionally used to initiate the polymerization is reduced after the startup of the polymerization reactor.
Claims10
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.
3 more elements
Dependencies are inferred from the claim text.