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:
Sep. 06, 2005
Filed:
Nov. 08, 2002
Jian Qin, Appleton, WI (US);
Richard Norris Dodge, Ii, Appleton, WI (US);
Sridhar Ranganathan, Suwanee, GA (US);
Cathleen M. Uttecht, Menasha, WI (US);
Xiaomin Zhang, Appleton, WI (US);
Jian Qin, Appleton, WI (US);
Richard Norris Dodge, II, Appleton, WI (US);
Sridhar Ranganathan, Suwanee, GA (US);
Cathleen M. Uttecht, Menasha, WI (US);
Xiaomin Zhang, Appleton, WI (US);
Kimberly-Clark Worldwide, Inc., Neenah, WI (US);
Abstract
Superabsorbent polymer materials are provided including absorbent polymers having a fast vortex time, desirably about 10 seconds or less, and a stiffness index of at least about 0.7, as determined by test procedures described herein. The absorbent polymers can be modified to obtain a faster vortex time by a method including providing an absorbent polymer having a first vortex time, absorbing water with the absorbent polymer, freeze-drying the swollen absorbent polymer to remove at least a portion of the absorbed water, and obtaining a modified absorbent polymer having a second vortex time. The ratio of the first vortex time to the second vortex time is at least about 5, and desirably the modified absorbent polymer has a stiffness index of at least about 0.7.