High stiffness absorbent polymers having improved absorbency...

Details High stiffness absorbent polymers having improved absorbency... High stiffness absorbent polymers having improved absorbency...

2005-09-06

2005-09-06

Zalukaeva, Tatyana (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C604S358000, C604S372000, C525S329500, C526S318300, C526S323000, C526S326000, C526S330000

Reexamination Certificate

active

06939914

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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