High stiffness absorbent polymers having improved absorbency rates and method for making the same
First Claim
1. A superabsorbent material, comprising:
- an absorbent polymer having a vortex time of about 10 seconds or less and a stiffness index of at least about 0.7.
2 Assignments
0 Petitions
Accused Products
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.
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Citations
42 Claims
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1. A superabsorbent material, comprising:
an absorbent polymer having a vortex time of about 10 seconds or less and a stiffness index of at least about 0.7. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
Specification