Stable disposable absorbent structure

• US 4,676,784 A
• Filed: 05/01/1984
• Issued: 06/30/1987
• Est. Priority Date: 05/01/1984
• Status: Expired due to Term

• Current Assignee: McNeil-PPC Incorporated (Johnson & Johnson)
• Original Assignee: Personal Products Co. (Johnson & Johnson)
• Inventors: Erdman, Edward P., Pieniak, Heinz A.
• Primary Examiner(s): YASKO JR, JOHN D
• Application Number:
  US06/605,964
• Time in Patent Office: 1,155 Days
• Field of Search: 604/369, 604/372, 604/378, 604/379, 604/365, 604/374, 604/366, 604/375, 604/367, 604/368, 604/385, 604/380
• US Class Current: 604/368
• CPC Class Codes: A61F 13/532 inhomogeneous in the plane of the pad
• CPC Class Codes: A61F 13/5323 having absorbent material located in discrete regions, e.g. pockets
• CPC Class Codes: A61F 13/537 characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer A61F13/538 takes precedence
• CPC Class Codes: A61F 13/539 characterised by the connection of the absorbent layers with each other or with the outer layers
• CPC Class Codes: A61F 2013/530131 being made in fibre but being not pulp
• CPC Class Codes: A61F 2013/530481 having superabsorbent materials, i.e. highly absorbent polymer gel materials
• CPC Class Codes: A61F 2013/530489 being randomly mixed in with other material
• CPC Class Codes: A61F 2013/530496 being fixed to fibres
• CPC Class Codes: A61F 2013/53051 being only in particular parts or specially arranged
• CPC Class Codes: A61F 2013/5395 with thermoplastic agent, i.e. softened by heat

Abstract

An absorbent product is provided which is disposable, light weight, stable and potentially thin. It is comprised of a superstructure of resilient fibers in combination with superabsorbent, which combination is provided with apertures. The apertures and at least one side of the superstructure are covered with hydrophilic material.

Claims

1. An absorbent product comprising a fibrous superstructure comprising from about 10 percent to about 80 percent by weight of resilient fibers and from about 20 percent to about 90 percent by weight superabsorbent, said superstructure having apertures with one dimension at least about 0.25 inch, and a lightly compacted hydrophilic porous material covering at least one side of said superstructure said covering material providing a capillary pressure to absorbed liquid that is higher than the superstructure.

2. An absorbent product in accordance with claim 1 wherein said superstructure is a fibrous web of wet and dry resilient fibers.

3. An absorbent structure in accordance with claim 2 wherein said fibrous web is a non-woven web.

4. An absorbent product in accordance with claim 3 wherein said non-woven web is a polyester web.

5. An absorbent product in accordance with claim 1 wherein said hydrophilic porous material is selected from the group consisting of open-cell foam, styrofoam beads, cellulosic fibers, peat moss, acrylic fibers and mixtures thereof.

6. An absorbent product in accordance with claim 5 wherein said cellulosic fibers are wood pulp fibers, cotton linters, rayon fibers, or mixtures thereof.

7. An absorbent structure in accordance with claim 1 wherein said superabsorbent is present in an amount of at least about 200% by weight.

8. An absorbent product in accordance with claim 1 containing a wicking layer on at least one side of said superstructure.

9. An absorbent product in accordance with claim 8 wherein said wicking layer is a layer of tissue.

10. An absorbent structure in accordance with claim 8 wherein said wicking layer is a layer of compressed wood pulp fibers.

11. A disposable diaper comprising a moisture-impermeable backing and a moisture-permeable facing, said backing and said facing having sandwiched therebetween an absorbent product of a substantially stable, flexible, absorbent fibrous superstructure of resilient fibers containing at least about 20% by weight of superabsorbent and having openings and a layer of a hydrophilic porous material covering at least one side of said superstructure, said layer providing a capillary pressure to absorbed liquid higher than that provided by said superstructure.

12. A sanitary napkin comprising an absorbent product partially encompassed by a liquid barrier, said absorbent product comprising a substantially stable, flexible, absorbent, fibrous superstructure of resilient fibers containing at least about 20% by weight of superabsorbent and having openings and a layer of a hydrophilic porous material covering at least one side of said superstructure, said layer providing a capillary pressure to absorbed liquid higher than that provided by said superstructure.