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:
Mar. 17, 2009
Filed:
Mar. 19, 2004
Norbert Herfert, Charlotte, NC (US);
Michael M. Azad, Charlotte, NC (US);
Peter W. Carrico, West Point, MS (US);
Guy Thomas Woodrum, Suffolk, VA (US);
Michael A. Mitchell, Waxhaw, NC (US);
Ma-ikay Kikama Miatudila, Monroe, NC (US);
Norbert Herfert, Charlotte, NC (US);
Michael M. Azad, Charlotte, NC (US);
Peter W. Carrico, West Point, MS (US);
Guy Thomas Woodrum, Suffolk, VA (US);
Michael A. Mitchell, Waxhaw, NC (US);
Ma-Ikay Kikama Miatudila, Monroe, NC (US);
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
A color-stable superabsorbent polymer having long-term color stability, and methods of manufacturing the polymer, are disclosed. The superabsorbent polymer is prepared using a sulfinic acid derivative, like 2-hydroxy-2-sulfinatoacetic acid, a salt thereof, or a mixture thereof, as the reducing agent in a polymerization initiator system for the preparation of a superabsorbent polymer from monomers. The resulting superabsorbent polymer resists color degradation during periods of extended storage, even at an elevated temperature and humidity.