Basf Se Corporation

Patrick Neal Hamilton

Matthias Weismantel

Rüdiger Funk

Thomas Daniel

Norbert Herfert

Monte Alan Peterson

Ronny De Kaey

Karl J Possemiers

Francisco Javier Lopez Villanueva

Ruediger Funk

Karl Possemiers

Kristine Hartnagel

Wanthip Poomsuwan

Olaf Hoeller

William G-J Chiang

The invention relates to a classification process for superabsorbent polymer particles, comprising classifying the water-absorbent polymer particles in a screen machine under reduced pressure wherein the pressure above the uppermost sieve is from 0 to 4.0 mbar per sieve higher than below the undermost sieve.

Classification process for superabsorbent polymer particles

In an improved superabsorbent complexed with aluminum ions, the aluminum ions are applied in the form of an aqueous solution comprising aluminum ions, which has the feature that it comprises aluminum ions in a proportion within the range of 0.5%-15% by weight (converted if appropriate to Al), based on the total mass of the solution, and further comprises anions of lactic acid (lactate ions) and phosphoric acid (phosphate ions), where the molar proportion of the lactate ions is within the range of 0.01-2.99 times the molar amount of Aland the molar proportion of the phosphate ions is within the range of 0.01-2.99 times the molar amount of Al.

Superabsorbent complexed with aluminum ions

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Freeport, TX, United States of America

Patrick Neal Hamilton