Process for producing water-absorbing polymer particles with low caking tendency and high absorption under pressure
AssigneeBASF SE
InventorsThomas Daniel, Christophe Bauduin, Norbert Herfert
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Abstract
A process for producing water-absorbing polymer particles with low caking tendency and high absorption under pressure, comprising polymerization of a monomer solution or suspension, drying of the resulting polymer gel, grinding, classifying, thermal surface postcrosslinking and coating with silicon dioxide, wherein the water-absorbing polymer particles have been coated, before, during or after the surface postcrosslinking with aluminum cations.
Claims6
Water-absorbing polymer particles comprising crosslinked polymers bearing acid groups which have been neutralized to an extent of 70 to 85 mol %, comprising 0.0001 to 0.25% by weight of silicon dioxide and at least 1.5×10−6 mol/g of aluminum cations.
Dependencies are inferred from the claim text.