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US 2012/0058267 A1Published application
Coating Process for Water-Absorbing Polymer Particles
AssigneeBASF SE
InventorsUwe Stueven, Rüdiger Funk, Matthias Weismantel, Holger Barthel, Oskar Stephan
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Abstract
A coating process wherein an aqueous liquid is sprayed onto surface postcrosslinked water-absorbing polymer particles in a horizontal mixer and the inner wall of the horizontal mixer which is in contact with the product is made from a stainless steel.
Claims10
A process for preparing 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 monomer copolymerizable with the monomer mentioned under a) and
- e) optionally one or more water-soluble polymer, comprising drying, grinding, classifying, and surface postcrosslinking, an aqueous liquid being sprayed onto the surface postcrosslinked water-absorbing polymer particles by at least one spray nozzle in a continuous horizontal mixer with moving mixing tools, wherein an inner wall of the mixer in contact with the product has a contact angle of less than 80° with respect to water.
2 more elements
Dependencies are inferred from the claim text.