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US 2012/0232177 A1Published application
Methods for Producing Water-Absorbent Foamed Polymer Particles
AssigneeBASF SE
InventorsFrancisco Javier Lopez Villanueva, Markus Linsenbühler, Matthias Weismantel, Bernd Siegel
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Abstract
A process for preparing water-absorbing polymer particles, comprising polymerization of a foamed monomer solution or suspension, drying, grinding and classification.
Claims17
A process for producing water-absorbing polymer particles by polymerizing a foamed aqueous monomer solution or suspension comprising
- a) at least one ethylenically unsaturated monomer which bears an acid group and has been neutralized to an extent of 25 to 95 mol %,
- b) at least one crosslinker,
- c) at least one initiator, and
- d) at least one surfactant,
- the monomer solution or suspension being polymerized to a polymeric foam and dried, which comprises subsequently grinding and classifying the polymeric foam.
2 more elements
Dependencies are inferred from the claim text.