Absorbent composites having improved fluid wicking and web integrity
View Patent ↗An absorbent article includes an absorbent composite which comprises substantially water-insoluble, water-swellable, non-regenerated, carboxyalkyl cellulose fibers. The fibers have a surface having the appearance of the surface of a cellulose fiber and comprise a plurality of first intra-fiber multi-valent metal ion crosslinks and a plurality of second intra-fiber crosslinks selected from ether crosslinks or ester crosslinks. In addition, the absorbent composite has been subjected to a treatment to create interfiber bonding between the fibers of the composite either throughout the composite or only on the surface of the composite.
1. An absorbent article comprising an absorbent composite;
wherein the absorbent composite comprises substantially water-insoluble, water-swellable, non-regenerated, carboxyalkyl cellulose fibers;
wherein the substantially water-insoluble, water-swellable, non-regenerated, carboxyalkyl cellulose fibers have a surface having the appearance of the surface of a cellulose fiber;
wherein the substantially water-insoluble, water-swellable, non-regenerated, carboxyalkyl cellulose fibers comprise a plurality of first intra-fiber multi-valent metal ion crosslinks and a plurality of second intra-fiber crosslinks selected from ether crosslinks or ester crosslinks; and
wherein the absorbent composite has been subjected to a treatment to create inter-fiber bonding.
2. The absorbent article of claim 1 wherein the inter-fiber bonding is present only on the surface of the absorbent composite.
3. The absorbent article of claim 1 wherein the inter-fiber bonding will be formed in-situ upon fluid insult.
4. The absorbent article of claim 1 wherein the treatment is selected from an alcohol/water solution or a cationic polymer/alcohol/water solution.
5. The absorbent article of claim 3 wherein the alcohol is selected from ethanol or isopropanol.
6. The absorbent article of claim 3 wherein the alcohol is present in the solution in an amount between about 50 wt % and 70 wt %.
7. The absorbent article of claim 1 wherein the absorbent composite has been dried to about 88-92 wt % solids prior to the treatment.
8. The absorbent article of claim 1 wherein the absorbent composite comprises from 90 wt % to 100 wt % of the substantially water-insoluble, water-swellable, non-regenerated, carboxyalkyl cellulose fibers.
9. The absorbent article of claim 1 wherein the multi-valent metal ion crosslinks comprise one or more metal ions selected from the group consisting of aluminum, boron, bismuth, titanium, zirconium, cerium, and chromium ions, and mixtures thereof.
10. The absorbent article of claim 1 wherein the second crosslinks are from 1,3-dichloro-2-propanol.
11. The absorbent article of claim 1 wherein the absorbent composite exhibits a vertical fluid wicking distance of at least about 5 inches as measured by the Vertical Wicking Test.