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:
Jun. 20, 2023
Filed:
Jul. 24, 2015
Evonik Superabsorber Gmbh, Essen, DE;
Christoph Loick, Tönisvorst, DE;
Scott Smith, Düsseldorf, DE;
Anne Ix-Mund, Kerken, DE;
Nicolaas De Bruin, Krefeld, DE;
Laurent Wattebled, Düsseldorf, DE;
Michael Azad, Reidsville, NC (US);
Frank Loeker, Krefeld, DE;
Evonik Superabsorber GmbH, Essen, DE;
Abstract
The present invention relates to an anti-stick processing aid for use in a process for producing water-absorbing polymers, comprising the steps of: i) mixing (α1) 0.1 to 99.999% by weight of polymerizable, ethylenically unsaturated monomers containing acid groups, or salts thereof, (α2) 0 to 70% by weight of monomers copolymerizable with (α1), (α3) 0.001 to 10% by weight of crosslinkers, (α4) 0 to 30% by weight of polymers, (α5) 0 to 80% by weight of water, and (α6) 0 to 20% by weight of assistants, (ii) free-radical polymerization with crosslinking to form a hydrogel polymer, (iii) drying the hydrogel polymer, (iv) grinding and sieving the hydrogel polymer, (v) surface postcrosslinking the hydrogel polymer and (vi) drying and finishing the water-absorbing polymer,wherein the anti-stick processing aid is used before and/or in steps (iii).