Absorbent article with multiple high absorbency zones

• US 6,459,016 B1
• Filed: 12/23/1999
• Issued: 10/01/2002
• Est. Priority Date: 12/23/1999
• Status: Expired due to Term

• Current Assignee: Edgewell Personal Care Brands, LLC (Edgewell Personal Care Company)
• Original Assignee: McNeil-PPC Incorporated (Johnson & Johnson)
• Inventors: Wysocki, Theresa, DeOliveira, Ricardo, Linares, Carlos, Rosenfeld, Leonard G.
• Primary Examiner(s): Weiss, John G.
• Assistant Examiner(s): Stephens, Jacqueline F
• Application Number:
  US09/471,934
• Time in Patent Office: 1,013 Days
• Field of Search: 604/379, 604/380, 604/367, 604/378, 604/368, 604/382, 604/385.01, 604/374, 604/375, 442/375, 442/381, 442/393, 428/221, 428/98
• US Class Current: 604/378
• CPC Class Codes: A61F 13/533 having discontinuous areas of compression
• CPC Class Codes: A61F 13/534 having an inhomogeneous composition through the thickness of the pad A61F13/538, A61F13/539 take precedence; homogeneous cores with tissue wrapping A61F13/53
• CPC Class Codes: A61F 2013/530532 the maximum being at certain depth in the thickness
• CPC Class Codes: A61F 2013/530562 being arranged in discontinuous pattern
• CPC Class Codes: A61F 2013/5307 characterized by the quantity or ratio of superabsorbent material
• CPC Class Codes: Y10T 428/249921 Web or sheet containing structurally defined element or component

Abstract

An absorbent structure having an absorbent element with an upper surface and a lower surface defining between therebetween a thickness. The absorbent element has an integral structure and includes a first high absorbency zone separated from a second high absorbency zone by a portion of the thickness of the absorbent element. The high absorbency zones have absorbent fibers and superabsorbent polymer particles. The portion of the absorbent element thickness separating the first and second high absorbency zones is substantially free of superabsorbent polymer particles.

Claims

1. An absorbent structure comprising an integral absorbent element having no identifiable laminate layers and having an upper surface and a lower surface defining therebetween an absorbent element thickness, the absorbent element further comprising a first high absorbency zone and a second high absorbency zone, the first high absorbency zone being separated from the second high absorbency zone by a portion of the absorbent element thickness, each of the first and second high absorbency zones comprising a mixture of absorbent fibers and superabsorbent polymer particles, wherein the portion of the absorbent element thickness is substantially free of superabsorbent polymer particles.

2. The absorbent structure of claim 1 wherein the superabsorbent polymer particles are uniformly mixed with absorbent fibers within at least one of the first and second high absorbency zones.

3. The absorbent structure of claim 1 wherein the superabsorbent polymer particles are present in each high absorbency zone at a loading of between 30 and 55 grams per square meter.

4. The absorbent structure of claim 1 wherein the absorbent element upper surface is substantially free of superabsorbent polymer particles.

5. The absorbent structure of claim 1 wherein the absorbent fibers comprise wood pulp fibers.

6. The absorbent structure of claim 1 having at least two spaced apart densified channels and wherein at least one of the first and second high absorbency zones is confined between the at least two densified channels.

7. The absorbent structure of claim 1 wherein the first high absorbency zone comprises about 15% of the absorbent element thickness, the first high absorbency zone being located within an upper 25% of the absorbent element thickness.

8. The absorbent structure of claim 1 wherein the first high absorbency zone comprises about 10% of the absorbent element thickness, the first high absorbency zone being located within an upper 20% of the absorbent element thickness.

9. The absorbent structure of claim 1 wherein the first high absorbency zone comprises first superabsorbent polymer particles and the second high absorbency zone comprises second superabsorbent polymer particles and wherein the first high superabsorbent polymer particles are different from the second superabsorbent polymer particles.

10. The absorbent structure of claim 1 wherein the first high absorbency zone comprises a first percentage of superabsorbent polymer particles and the second high absorbency zone comprises a second percentage of superabsorbent polymer particles and wherein the first percentage is different than the second percentage.

11. The absorbent structure of claim 1 wherein the absorbent element further comprises absorbent materials selected from the group consisting of binders, odor-controlling particles, perfumes, ethylene vinyl acetate based latex binders, adhesives, thermally fusible fibers, and bicomponent fibers.

12. The absorbent structure of claim 1 wherein the absorbent element further comprises nonabsorbent materials selected from the group consisting of nonabsorbent fibers, binders, odor controlling particles, perfumes, ethylene vinyl acetate based latex binders, adhesives, thermally fusible fibers, and bicomponent fibers.

13. The absorbent structure of claim 1 further comprising a third high absorbency zone, wherein the first high absorbency zone is separated from the second high absorbency zone by a first portion of the absorbent element thickness and the second high absorbency zone is separated from the third high absorbency zone by a second portion of the absorbent element thickness, the first and second portions of the absorbent element thickness are substantially free of superabsorbent polymer particles.

14. The absorbent structure of claim 1 further comprising two or more additional absorbency zones, wherein each additional zone is separated from a subjacent absorbency zone by a portion of the absorbent element thickness, which portion is substantially free of superabsorbent polymer particles.

15. An absorbent article adapted to be worn in a crotch portion of a user'"'"'s undergarment, the article comprising:

a liquid permeable body-facing layer;

a liquid impermeable barrier layer; and

an absorbent structure comprising an integral absorbent element having no identifiable laminant layers and having an upper surface and a lower surface defining therebetween an absorbent element thickness, the absorbent element further comprising a first high absorbency zone and a second high absorbency zone, the first high absorbency zone being separated from the second high absorbency zone by a portion of the absorbent element thickness, each of the first and second high absorbency zones comprising a mixture of absorbent fibers and superabsorbent polymer particles, wherein the portion of the absorbent element thickness is substantially free of superabsorbent polymer particles.

16. The absorbent article of claim 15 wherein the superabsorbent polymer particles are uniformly mixed with absorbent fibers within at least one of the first and second high absorbency zones.

17. The absorbent article of claim 15 wherein the absorbent element upper surface is substantially free of superabsorbent polymer particles.

18. The absorbent article of claim 15 wherein the absorbent fibers comprise wood pulp fibers.

19. The absorbent article of claim 15 wherein the superabsorbent polymer particles are present in each high absorbency zone at a loading of between about 30 and 55 grams per square meter.

20. The absorbent article of claim 15 wherein the superabsorbent polymer comprises a crosslinked polyacrylate.

21. The absorbent article of claim 15 wherein the first high absorbency zone has a first zone thickness comprising about 15% of the absorbent element thickness, the first high absorbency zone being located within an upper 25% of the absorbent element thickness.

22. The absorbent article of claim 15 wherein the first high absorbency zone has a first zone thickness comprising about 10% of the absorbent element thickness, the first high absorbency zone being located within an upper 20% of the absorbent element thickness.