The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 08, 2024
Filed:
Apr. 11, 2022
Basf SE, Ludwigshafen, DE;
Kristine Hartnagel, Ludwigshafen, DE;
Thomas Gieger, Ludwigshafen, DE;
Thomas Daniel, Ludwigshafen, DE;
Marcus Schroeder, Ludwigshafen, DE;
Michelle Morano, Charlotte, NC (US);
Nathaniel Troy Greene, Charlotte, NC (US);
BASF SE, Ludwigshafen, DE;
Abstract
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.