Absorbent core including folded substrate
View Patent ↗An absorbent core is provided including a substrate that performs at least one fluid handling function. At least a portion of at least one region of the substrate has been modified by aperturing, calendering, coating, creping, heating, printing, stretching, or a combination thereof to impart at least one different fluid handling function. The substrate is folded to provide a plurality of panels wherein at least a portion of one panel corresponds to at least a portion of the modified region of the substrate. An absorbent article including the absorbent core and a process for making the absorbent core are also disclosed.
1. An absorbent core, comprising:
a substrate which is folded upon itself to provide a plurality of panels, wherein the substrate is folded to provide an absorbent core having a cross-sectional configuration selected from the group consisting of an “e”-shape, a “z”-shape, a sigma-shape and an accordion-shape;
the substrate performing a first fluid handling function;
at least one portion of at least one panel performing a second fluid handling function different from the first fluid handling function;
wherein the at least one portion of at least one panel further comprises a modifying material comprising a binding agent which is an absorbent adhesive composition of a crosslinkable binder composition; and
the crosslinkable binder composition comprises an alkoxysilane grafted poly(ethylene oxide).
2. The absorbent core of claim 1 , wherein the substrate comprises a material selected from the group consisting of nonwoven webs, woven webs, knitted fabrics, cellulosic tissue sheets, plastic films, foams, stranded composites, elastomer net composites and combinations thereof.
3. The absorbent core of claim 1 , wherein the first and second fluid handling functions are selected from the group consisting of body waste barrier, distribution, feces containment, feces modification, intake, lock-up, menses containment, menses modification, odor control, retention, and skin treatment.
4. The absorbent core of claim 1 , wherein the at least one portion of at least one panel comprises apertures.
5. The absorbent core of claim 1 , wherein the at least one portion of at least one panel has a higher density than another portion of the substrate.
6. The absorbent core of claim 1 , wherein the substrate is folded such that at least a portion of the modifying material is enclosed within the absorbent core.
7. The absorbent core of claim 1 , wherein the modifying material comprises a viscoelastant.
8. The absorbent core of claim 1 , wherein the modifying material comprises a surfactant.
9. The absorbent core of claim 1 , wherein the modifying material comprises a binding agent which is an absorbent adhesive composition of an in situ neutralizable binder composition.
10. The absorbent core of claim 9 , wherein tho in situ neutralizable binder composition includes a copolymer of an unneutralized polyacid and a polyamine binder material.
11. The absorbent core of claim 10 , wherein the copolymer of an unneutralized polyacid comprises a material selected from the group consisting of poly(acrylic acid), poly(methacrylic acid), poly(maleic acid), carboxymethyl cellulose, alginic acid, poly(aspartic acid), and poly(glutamic acid).
12. The absorbent core of claim 10 , wherein the polyamine binder material comprises a material selected from the e group consisting of poly(vinylamine) a polyethylenimine, a poly(vinylguanidine), a poly(allylamine), a poly(allylguanidine), a poly(lysine), a poly(arginine), poly(histidine), a poly(dialkylaminoalkyl (meth)acrylamide), and copolymers containing lysine, arginine or histidine.
13. The absorbent core of claim 10 , wherein the substrate is folded such that the copolymer of an unneutralized polyacid and the polyamine binder material are brought together to provide a macro bipolar absorbent film.
14. The absorbent core of claim 1 , wherein the modifying material comprises a binding agent which is an absorbent adhesive composition of an in situ polymerizable binder composition.
15. The absorbent core of claim 1 , wherein the crosslinkable binder composition has a glass transition temperature of 30 degrees Celsius or lower.
16. The absorbent core of claim 1 , wherein the crosslinkable binder composition comprises, an acrylic acid copolymer selected from the group consisting of acrylic acid and long chain, hydrophilic acrylate esters, acrylic acid and long chain, hydrophilic methacrylate esters, and acrylic acid salts and long chain, hydrophilic methacrylate esters.
17. The absorbent core of claim 1 , further comprising an absorbent material having an absorbent capacity of at least about 7 grams 0.9 weight percent saline per grain absorbent material.
18. The absorbent core of claim 17 , wherein the absorbent material comprises a superabsorbent material selected from the group consisting of crosslinked forms of sodium polyacrylate, sodium polymethacrylate, polyacrylamide, carboxymethyl cellulose, grafted starch, poly(sodium aspartate), poly(vinyl amine), poly(dimethyldiallyl amine), chitosan salt, and/or poly(ethylene imine) and combinations thereof.
19. The absorbent core of claim 17 , further comprising an attachment mechanism for securing the absorbent material to the substrate, the attachment mechanism selected from the group consisting of physical bonds, chemical bonds and combinations thereof.
20. The absorbent core of claim 1 , wherein the crosslinkable binder includes about 0.1 to about 20 weight percent of monomer to weight of poly(ethylene)oxide.
21. The absorbent core of claim 20 , wherein the monomer comprises a trialkoxy silane functional group.
22. The absorbent core of claim 20 , wherein the monomer is selected from the group consisting of methacryloxyethyl trimethoxy silano, methacryloxypropyl triethoxy silane, methacryloxypropyl tripropoxy silane, acryloxypropylmethyl dimethoxy silane, 3-acryloxypropyl trimethoxy silane, 3-methacryloxyproplmethyl diethoxy silane, 3-methacryloxyproplmethyl dimethoxy silane, 3-methacryloxypropyl tris(methoxyethoxy) silane and combinations thereof.
23. The absorbent core of claim 20 , wherein the crosslinkable binder comprises poly(ethylene glycol) methacrylate having from 1 to 13 ethylene glycol units.
24. An absorbent article comprising an absorbent core having a substrate which is folded upon itself to provide a plurality of panels; wherein the substrate is folded to provide an absorbent core having a cross-sectional configuration selected from the group consisting of a “z”-shape, a sigma-shape and an accordion-shape;
the substrate performing a first fluid handling function;
at least one portion of at least one panel performing a second fluid handling function different from the first fluid handling function;
wherein the at least one portion of at least one panel further comprises a modifying material comprising a binding agent which is an absorbent adhesive composition of a crosslinkable binder composition; and
the crosslinkable binder composition comprises an alkoxysilane grafted poly(ethylene oxide).
25. The absorbent article of claim 24 , wherein the article is an absorbent garment.
26. The absorbent article of claim 25 , wherein the absorbent garment comprises:
a bodyside liner;
a garment-side cover; and
the absorbent core positioned between the bodyside liner and the garment-side cover.
27. The absorbent article of claim 25 , wherein the absorbent garment has an average thickness of about 6.4 millimeters or less.
28. The absorbent article of claim 24 , wherein the article is a medical garment.
29. The absorbent article of claim 24 , wherein the article is selected from the group consisting of wipes, tissues, sweat pads, head mats and bed pads.