Form-fitting self-adjusting disposable garment with a multilayered absorbent

• US 4,699,620 A
• Filed: 09/06/1985
• Issued: 10/13/1987
• Est. Priority Date: 09/06/1985
• Status: Expired due to Term

• Current Assignee: Kimberly-Clark Worldwide Incorporated (Kimberly-Clark Corporation)
• Original Assignee: Kimberly-Clark Corporation
• Inventors: Bernardin, Leo J.
• Primary Examiner(s): Rosenbaum, C. Fred
• Assistant Examiner(s): Whelton, Denise
• Application Number:
  US06/773,749
• Time in Patent Office: 767 Days
• Field of Search: 604/358, 604/365-368, 604/370, 604/372, 604/374, 604/378-380, 604/303, 604/384
• US Class Current: 604/385.25
• CPC Class Codes: A61F 13/49007 Form-fitting, self-adjusting disposable diapers

Abstract

An anatomically form-fitting, self-adjusting disposable garment with a stretchable outer cover (20), fixed position fasteners (70) (72) (74) (76) attached to the outer cover (20) and a multilayered absorbent structure (22). The multilayered absorbent structure (22) has a liquid permeable bodyside liner (42), a liquid impermeable barrier (44) and an absorbent composite (38). The absorbent composite (38) can comprise a uniform composition of fluff or a mixture of a hydrogel and absorbent material. Alternately, the absorbent composite (38) can comprise a first and second layer of absorbent materials (37) (39) differing by densities or differing by pore sizes. The absorbent composite can further comprise a layer of a hydrogel (45). Further, the absorbent composite can comprise a mixture of a hydrogel and a fiber material which can be a hydrophilic or hydrophobic material which may be treated with a surfactant.

Claims

1. An anatomically form-fitting, generally self-adjusting disposable absorbent garment comprising:

a breathable elastomeric nonwoven outer cover comprising a nonwoven elastic web joined to one or more gatherable nonwoven webs, including a waist opening, a pair of leg openings, a central crotch section between said leg openings and front and rear panels separated by said crotch section;

an absorbent insert structure substantially superposable on said front and rear panels and said crotch section, including a liquid permeable bodyside liner and a liquid impermeable barrier with an absorbent core disposed therebetween wherein said core comprises;

a first absorbent layer, adjacent to said bodyside liner, with a first density; and

a second absorbent layer, adjacent to said first layer, with a second density; and

attachment means for attaching and integrating said insert to said outer cover while allowing substantially unrestricted functional stretchability thereof.

2. The invention of claim 1, wherein said first density is in a range of 0.03 to 0.14 g/cc and wherein said second density is in a range of 0.14 to 0.35 g/cc.

3. The invention of claim 2, wherein said first density is preferably in a range of 0.07 to 0.11 g/cc and wherein said second density is preferably in a range of 0.16 to 0.3 g/cc.

4. The invention of claim 1, 2 or 3, wherein said first layer comprises softwood fluff at said first density and said second layer comprises softwood fluff at said second density.

5. The invention of claim 1, 2 or 3, wherein said first layer comprises softwood fluff at said first density and said second layer comprises hardwood fluff at said second density.

6. The invention of claim 1, wherein said first absorbent layer has a first average pore size and said second absorbent layer has a second average pore size.

7. The invention of claim 6, wherein said first absorbent layer comprises predominantly softwood fluff and said second absorbent layer comprises preponderantly hardwood fluff.

8. The invention of claim 1, wherein said first absorbent layer has a first density in a range of 0.03 to 0.14 g/cc and wherein said second absorbent layer comprises hardwood fluff with said second density in a range of 0.14 to 0.35 g/cc.

9. The invention of claim 1, 2, 3, 6 or 7, wherein said absorbent composite further comprises a hydrogel material.

10. The invention of claim 9, wherein said hydrogel layer is disposed between said first absorbent layer and said second absorbent layer.

11. The invention of claim 9, wherein said hydrogel layer is disposed between said second absorbent layer and said barrier.

12. The invention of claim 1, 2, 3, 6 or 7, wherein said absorbent core comprises a meltblown absorbent layer comprising:

a polymer treated with sufficient surfactant to make wettable; and

a hydrogel.

13. The invention of claim 12, wherein said hydrogel is in fibrous or particulate form.

14. The invention of claim 1, 2, 3, 6 or 7, wherein said absorbent core comprises a mixture of a hydrogel material with 2 to 98% by weight of a filler material.

15. The invention of claim 14, wherein said filler material is an absorbent fiber.

16. The invention of claim 15, wherein said absorbent fiber is a cellulosic fiber.

17. The invention of claim 14, wherein said filler material is a hydrophilic material.

18. The invention of claim 14, wherein said filler material is a hydrophobic material.

19. The invention of claim 14, wherein said filler material is a thermoplastic resin.

20. The invention of claim 19, wherein said filler material comprises polyolefin fibers.

21. The invention of claim 20, wherein said filler material is a mixture of polyolefin fibers and cellulosic fibers.

22. The invention of claim 14, wherein said filler material is treated with a surfactant.

23. The invention of claim 1, 2, 3, 6 or 7 further comprising front and back waist sections defining said waist opening and fastening means for securing said disposable garment around a wearer.

24. The invention of claim 23, further comprising a waist elastic member in each of said front waist section and said back waist section.

25. The invention of claim 24, further comprising leg elastic members disposed along said leg openings at outermost portions of said crotch section to further gather said garment about a wearer.

26. The invention of claim 25, wherein said outermost portions of said crotch section have hems and said leg elastic members are disposed within said hems.

27. The invention of claim 26, wherein said waist sections have hems and waist elastic members are disposed within said hems.

28. The invention of claim 27, wherein said leg and waist have hems and said leg and waist elastic members complement said resiliently stretchable outer cover to further make said garment anatomically conforming.

29. The invention of claim 1, wherein said elastic web of said outer cover comprises a melt-extruded polymeric elastomer material and said one or more gatherable nonwoven webs comprise either spunbonded, meltblown, carded, costructured or other nonwoven webs.

30. The invention of claim 29, wherein said melt-extruded polymeric material of said elastic web comprises a polyolefin blended and meltblown with one or more elastomeric polymer materials.

31. The invention of claim 30, wherein said elastomeric polymer material of said elastic web comprises an A-B-A block copolymer.

32. The invention of claim 31, wherein said A-B-A block copolymer comprises an A-B-A'"'"' block copolymer.

33. The invention of claim 1, wherein said outer cover is also liquid permeable.

34. The invention of claim 1, wherein said outer cover comprises a stretch-bonded nonwoven laminate wherein said elastic nonwoven web is bonded or otherwise joined to said one or more gatherable nonwoven webs while said elastic nonwoven web is in a stretched condition.

35. The invention of claim 1, wherein said absorbent insert structure is attached and integrated into said outer cover while said outer cover is in a stretched condition.

36. The invention of claim 35, wherein said outer cover is stretched in a direction essentially cross body to the wearer prior to said insert being integrated thereinto.

37. The invention of claim 36, wherein said attachment means comprise autogenous bonds bonding said insert to said outer cover.

38. The invention of claim 37, wherein said autogenous bonds are generated thermally or ultrasonically.

39. The invention of claim 1, wherein said liner further comprises at least two nonwoven web components, including a soft, compressible fluid transfer and separation component of synthetic fibers in fluid conductive contact with a bodyside reinforcing component of synthetic fibers to remove fluid away from the skin of a wearer.

41. The invention of claim 39 or 40, wherein either of said reinforcing and separation components comprise a carded, airlaid or spunbonded web of synthetic fibers.

42. The invention of claim 41, wherein either of said components comprise polyolefin or polyester fibers.

43. The invention of claim 39 or 40, wherein either of said reinforcing and separation components have a basis weight in the range from about 30--400 g/m² and a thickness from about 0.1 to about 1.0 cm.

44. The invention of claim 43, wherein the combined basis weight of said liner is from about 30 to about 100 g/m².

45. The invention of claim 44, wherein the basis weight of said reinforcing component is from about 10 to 15 g/m² and said separation component is from about 20 to 90 g/m².

46. The invention of claim 43, wherein either of said reinforcing and separation components contain an effective amount of surfactant or other finish to be made wettable.

47. The invention of claim 43, wherein either of said reinforcing and separation components comprise a carded airlaid or spunbonded web of synthetic fiber.

48. The invention of claim 47, wherein said separation component comprises polyolefin fibers.

49. The invention of claim 47, wherein said separation component preferably contains from about 25 to about 50% hollowfill polyester staple fibers.

50. The invention of claim 48, wherein said synthetic fibers comprise more than about 50% polypropylene fibers.

51. The invention of claim 47, wherein said separation component contains from about 50-75% hollowfill polyester staple fibers from about 3-6 denier and about 1-2 inches in length.

52. The invention of claim 46, wherein said separation component contains from about 0.2 to 0.5% surfactant.

53. The invention of claim 48, wherein either of said reinforcing and separation components comprise a spunbonded web.

54. The invention of claim 53, wherein said spunbonded separation component is formed from a nonwoven web of filaments spun and collected without bonding then bonded or otherwise joined to said reinforcing component in fluid conductive contact therewith.

55. The invention of claim 54, wherein said separation component and said reinforcing component are joined together by thermal or ultrasonic bonds.

56. The invention of claim 54, wherein said separation component comprises polyolefin fibers having a denier in the range of about 3-6 denier.

57. The invention of claim 39, wherein said absorbent core comprises a mixture of a hydrogel material with 2 to 9% by weight of a filler material.

58. The invention of claim 57, wherein said hydrogel layer is disposed between said second absorbent layer and said barrier.

59. The invention of claim 58, wherein said hydrogel layer is disposed between said first absorbent layer and said second absorbent layer.

60. The invention of claim 59 further comprising a third absorbent layer disposed between said second absorbent layer and said barrier.

61. The invention of claim 58 wherein said hydrogel material is disposed in a melt-extruded layer of polymeric material.

62. The invention of claim 61, wherein said first density is in a range of 0.03 to 0.14 g/cc and wherein said second density is in a range of 0.14 to 0.35 g/cc.

63. The invention of claim 62, wherein said first density is preferably in a range of 0.07 to 0.11 g/cc and wherein said second density is preferably in a range of 0.16 to 0.3 g/cc.

64. The invention of claim 63, wherein said first layer comprises softwood fluff at said first density and said second layer comprises softwood fluff at said second density.

65. The invention of claim 63 or 64, wherein said first layer comprises softwood fluff at said first density and said second layer comprises hardwood fluff at said second density.

66. The invention of claim 65 further comprising side flaps extending from opposed lateral sides of said absorbent insert overlying and attached to either of said front and rear panels while said outer cover is stretched in an essentially cross-body direction.

67. The invention of claim 66 wherein said side flaps comprise extensions of said liner.

68. The invention of claim 67 wherein said side flaps are attached to said outer cover by autogenous bonds of the type generated either thermally or ultrasonically.

69. The invention of claim 10 further comprising a third absorbent layer disposed between said second absorbent layer and said barrier.

40. An anatomically form-fitting, generally self-adjusting disposable absorbent garment comprising:

a breathable elastomeric nonwoven outer cover comprising a nonwoven elastic web joined to one or more gatherable nonwoven webs, including a waist opening, a pair of leg openings, a central crotch section between said leg openings and front and rear panels separated by said crotch section;

an absorbent insert structure, substantially superposable on said front and rear panels and said crotch section having longitudinally opposed ends and including a liquid permeable bodyside liner and a liquid impermeable barrier with an absorbent core disposed therebetween, said liner comprising at least two nonwoven web components, including a soft, compressible fluid transfer and separation component of synthetic fibers in fluid conductive contact with a bodyside reinforcing component of synthetic fibers to remove fluid away from the skin of a wearer; and

attachment means for attaching and integrating said insert to said outer cover while allowing substantially unrestricted functional stretchability thereof.