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:
Aug. 28, 2012
Filed:
Apr. 13, 2012
Herbert Gartner, Baden-Baden, DE;
Jorg Harren, Baesweiler, DE;
Marc Hager, Haguenau, FR;
Harald Plochinger, Buhl, DE;
Daniel Fricker, Roeschwoog, FR;
Hans-peter Kohler, Buhlertal, DE;
Sabine Auernig, Lauf, DE;
Herbert Gartner, Baden-Baden, DE;
Jorg Harren, Baesweiler, DE;
Marc Hager, Haguenau, FR;
Harald Plochinger, Buhl, DE;
Daniel Fricker, Roeschwoog, FR;
Hans-Peter Kohler, Buhlertal, DE;
Sabine Auernig, Lauf, DE;
Evonik Stockhausen GmbH, Krefeld, DE;
Abstract
The present invention relates to superabsorbent polymer comprising the comprising the free radical polymerization product of an aqueous monomer mixture containing at least one α,β-ethylenically unsaturated monomer; at least one monomer having at least two α,β-ethylenically unsaturated groups; a crosslinking agent having at least two polymerizable double bonds; iron ions in an amount of from about 0.1 to about 3 wppm based on the total weight of the aqueous monomer mixture; and at least one chelating agent in an amount to provide a molar ratio of chelating agent to iron ion of from about 0.8 to about 4.0.