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US 8,273,836 B2Granted
Method for producing water-absorbent polymer particles
AssigneeBASF SE
InventorsMatthias Weismantel, Rüdiger Funk, Dominicus van Esbroeck
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Abstract
A process for producing water-absorbing polymer particles, wherein a product stream comprising water-absorbing polymer particles is tested for nonferritic metallic impurities by means of an eddy current detector.
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 acid groups and may be at least partly neutralized,
- b) at least one crosslinker,
- c) optionally one or more ethylenically and/or allylically unsaturated monomer copolymerizable with the monomer specified under a), and
- d) optionally one or more water-soluble polymers,
- wherein plant parts in contact with product comprise at least partly of nonferritic metallic materials, wherein a product stream comprising the water-absorbing polymer particles is tested for nonferritic metallic impurities by means of an eddy current detector.
2 more elements
Dependencies are inferred from the claim text.