Back to results
US 8,410,233 B2Granted
Method for producing superabsorbers with a low residual monomer content
AssigneeBASF SE
InventorsMark Elliott, Thomas Daniel
Life of this patent
Estimating the term…
Abstract
To prepare superabsorbents with a low residual monomer content, a salt of urea with an inorganic acid is added to the monomer mixture before or during the polymerization or to the polymer after the polymerization but before a heat treatment which follows the polymerization.
Claims11
A polymerization process for preparing superabsorbent particles comprising adding a salt of urea with an inorganic acid to a monomer mixture before or during the polymerization, or to a polymer after the polymerization, but before a heat treatment which follows the polymerization,
- wherein the superabsorbent particles have a L value (CIE color number) of at least 75.
Dependencies are inferred from the claim text.