METHOD FOR THE PRODUCTION OF SUPERABSORBERS
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United States of America Patent
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Sep 30, 2021
app pub date -
Aug 1, 2017
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Aug 10, 2016
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A process for producing superabsorbents, comprising polymerization of a monomer solution and thermal surface postcrosslinking, wherein the monomer solution comprises at least 0.75% by weight of a hydroxyphosphonic acid or salts thereof, calculated on the basis of the total amount of monomer used, and at least 0.09% by weight of aluminum cations, calculated on the basis of the total amount of polymer particles used, is added to the polymer particles before, during or after the thermal surface postcrosslinking.
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