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US 2011/0237735 A1Published application
Process for Producing Water-Absorbing Polymer Particles
AssigneeBASF SE
InventorsRüdiger Funk, Thomas Pfeiffer
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Abstract
A process for producing water-absorbing polymer particles, wherein heated water-absorbing polymer particles are remoisturized and cooled in a high-speed mixer.
Claims10
A process for 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 monomer copolymerizable with the monomer mentioned under a), and
- e) optionally one or more water-soluble polymer,
- comprising drying, grinding, classifying, thermal surface postcrosslinking, and remoisturizing, which comprises performing the remoisturizing step in a continuous horizontal mixer with moving mixing tools, where the Froude number is at least 0.05, the water-absorbing polymer particles in the horizontal mixer have a starting temperature of at least 90° C., and the remoisturized water-absorbing polymer particles in the horizontal mixer are cooled to a temperature of less than 80° C.
3 more elements
Dependencies are inferred from the claim text.