Appeal No. 97-4294 Page 16
Application No. 08/294,155
(3500 pascals) using 0.9% by weight saline solution. Such
materials occur naturally and may also be synthesized.
Examples of
natural superabsorbents or hydrocolloids include gum arabic,
agar, guar gum, starches, dextran and gelatin. Semi-synthetic
versions include modified celluloses such as carboxymethyl
cellulose and modified starches. Examples of synthetic
absorbent gelling material polymers include but are not
limited to polyvinylpyrrolidone and poly-acrylates.
Commercially available products include, but are not limited
to, Hoechst-Celanese SANWET IM5000 and IM3900 from®
Hoechst-Celanese Corporation of Charlotte, N.C.; Dow Drytech®
534 from Dow Chemical Company of Midland, Mich. and Allied
Colloids SALSORB 89 from Allied Colloids, Ltd. of Bradford,®
UK. Fibrous superabsorbents are also commercially available.
Typically these fibers will have diameters ranging from about
10 to 50 microns and lengths ranging from about 3 to 60
millimeters. Their absorbency will typically range between
about 10 and about 40 grams per gram of superabsorbent under a
load of 0.5 pounds per square inch (3500 pascals) using 0.9%
by weight saline solution. Commercially available
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