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US 10,208,149 B2Granted
Method for producing water-absorbent polymer particles with a higher permeability by polymerising droplets of a monomer solution
AssigneeBASF SE
InventorsUwe Stueven, Matthias Weismantel, Wilfried Heide, Marco Krüger, Volker Seidl, Stefan Blei, Dennis Loesch, Rüdiger Funk, Annemarie Hillebrecht
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Abstract
A process for preparing water-absorbing polymer beads with high permeability by polymerizing droplets of a monomer solution, comprising monomers bearing acid groups, in a gas phase surrounding the droplets, wherein the monomer solution comprises polyvalent cations and the polymer beads have a mean diameter of at least 150 μm.
Claims20
A process for preparing water-absorbing polymer beads comprising polymerizing droplets of a monomer solution comprising
- a) at least one ethylenically unsaturated monomer bearing acid groups,
- b) at least one crosslinker,
- c) at least one initiator, and
- d) water,
- in a gas phase surrounding each of the individual droplets, wherein the monomer solution comprises polyvalent cations and the polymer beads have a mean diameter of at least 150 μm.
2 more elements
Dependencies are inferred from the claim text.