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

• US 4,838,885 A
• Filed: 03/18/1987
• Issued: 06/13/1989
• Est. Priority Date: 09/06/1985
• Status: Expired due to Fees

• Current Assignee: Kimberly-Clark Worldwide Incorporated (Kimberly-Clark Corporation)
• Original Assignee: Kimberly-Clark Corporation
• Inventors: Bernardin, Leo J.
• Primary Examiner(s): Yasko, John D.
• Assistant Examiner(s): Whelton, Denise
• Application Number:
  US07/027,472
• Time in Patent Office: 818 Days
• Field of Search: 604/368, 604/385.1, 604/385.2, 604/378, 604/374, 604/370
• US Class Current: 604/385.22
• 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 filler 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 having longitudinally opposed ends and including a liquid permeable bodyside liner and a liquid impermeable barrier with an absorbent core disposed therebetween, said absorbent core comprising a first absorbent layer, adjacent to said bodyside liner, with a first average pore size and a second absorbent layer, adjacent to said first layer, with a second average pore size; 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 absorbent layer has a first density in a range of 0.03 to 0.14 g/cc and wherein said second absorbent layer has a second density 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 or 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 disposable garment of claim 3 wherein said absorbent core comprises an absorbent fiber.

5. The disposable garment of claim 4 wherein said absorbent fiber comprise fluff.

6. The disposable garment of claim 5 wherein said firs layer comprises softwood fluff at said first density and said second layer comprises softwood fluff at said second density.

7. The disposable garment of claim 5 wherein said first layer comprises softwood fluff at said first density and said second layer comprises hardwood fluff at said second density.

8. The disposable garment of claim 1 wherein said first absorbent layer comprises predominantly softwood fluff and said second absorbent layer comprises preponderantly hardwood fluff.

9. The invention of claim 8 wherein said first and second absorbent layers have substantially the same density.

10. The invention of claim 1 further comprising at least one hydrogel layer.

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

12. The invention of claim 10 wherein said hydrogel layer is disposed beneath said second absorbent layer.

13. The invention of claim 3 wherein said absorbent core comprises a meltblown absorbent material:

a polymer treated with sufficient surfactant to make wettable; and

a hydrogel.

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

15. The invention of claim 1 wherein said absorbent core comprises a mixture of a hydrogel material with 2 to 98% by weight of a filler material.

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

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

18. The invention of claim 15 wherein said filler material is a hydrophilic material.

19. The invention of claim 15 wherein said filler material is a hydrophobic material.

20. The invention of claim 15 wherein said filler material is polyolefin fibers.

21. The invention of claim 15 wherein said filler material is a thermoplastic resin.

22. The invention of claim 15 wherein said filler material is a mixture of polyolefin fibers and cellulosic fibers.

23. The disposable garment of claim 18, 19, 20, 21 or 22 wherein said filler material is treated with a surfactant.

24. The disposable garment of claim 1 further comprising fastening means for securing said disposable garment around a wearer.

25. The invention of claim 1 wherein said outer cover is resiliently stretchable in at least one direction more than about 20%.

26. The invention of claim 1 or 25 wherein said attachment means comprises bonding means for bonding outer cover to said insert for attaching such liner to said barrier.

27. The invention of claim 26 further comprising fastening means for securing said garment about a wearer.

28. The invention of claim 27 wherein said outer cover is resiliently stretchable in an essentially cross-body direction.

29. The invention of claim 28 wherein said insert is attached to either of said front and rear panels.

30. The invention of claim 28 wherein said insert is attached to said crotch section.

31. The invention of claim 26 further comprising autogenous bonds attaching said insert to said outer cover and said barrier to said liner.

32. The disposable garment of claim 28 wherein said outer cover is resiliently stretchable from about 20% to about 200%.

33. The invention of claim 1 further comprising front and back waist sections defining said waist opening and an elastic member disposed in each of said front waist section and said back waist section to further gather said garment about a wearer.

34. The invention of claim 1 further comprising leg elastic members disposed along said legs openings at outermost portions of said crotch section to further gather said garment about a wearer.

35. The invention of claim 1 wherein outermost portions of said crotch section have hems and leg elastic members are disposed within said hems.

36. The invention of claim 1 further comprising front and back waist sections together defining said waist opening wherein said waist sections have hems and waist elastic members are disposed within said hems.

37. The invention of claim 36 wherein said legs openings have hems and leg elastic members are disposed in said leg hems and wherein said leg and waist elastic members complement said resiliently stretchable outer cover and said hems to further make said garment anatomically conforming.

38. The invention of claim 1 further comprising fastening means for securing said disposable garment around a wearer.

39. The invention of claim 38 further comprising full-length releasably engageable fastening means for effecting a substantially full-length, continuous and noncollapsible closure from said waist opening to each of said leg openings thereby maintaining the dimensional integrity of said garment.

40. The invention of claim 39 further comprising fixed position fastening means, fastenable only at fixed positions on said outer cover, for providing discrete target locations assuring proper fastening of said garment on a wearer.

41. The invention of claim 1 wherein said elastic nonwoven web of said outer cover comprises an extruded elastomeric nonwoven material bonded to said one or more gatherable facing sheets while said elastomeric web is stretched in at least one direction.

42. The invention of claim 41 wherein said extruded elastomeric material comprises a meltblown polymeric material and said one or more gatherable nonwoven webs comprise either spunbonded, meltblown, carded, constructed or other nonwoven webs.

43. The invention of claim 42 wherein said meltblown polymeric material of said elastic web comprises a polyolefin blended and meltblown with one or more elastomeric polymer materials.

44. The invention of claim 43 wherein said A-B-A block copolymer.

45. The invention of claim 44 wherein, said A-B-A block copolymer comprises an A-B-A'"'"' block copolymer.

46. The garment of claim 1 wherein said outer cover is also liquid permeable.

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

48. 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.

49. The invention of claim 48 wherein said outer cover is stretched in a direction essentially cross body to the wearer prior to said insert being integrated thereinto.

50. The invention of claim 49 wherein said attachment means comprise autogenous bonds bonding said insert to said outer cover.

51. The invention of claim 50 wherein said autogenous bonds are generated thermally or ultrasonically.

52. The invention of claim 1 wherein said liner further comprises a bodyside reinforcing component of synthetic fibers and soft compressible fluid transfer and separation component of synthetic fibers positioned between and in fluid conductive contact with said reinforcing component and said absorbent core to remove fluid away from the skin of a wearer.

53. The invention of claim 52 wherein either of said reinforcing and separating components comprises a spunbonded, carded or airlaid web of synthetic fibers.

54. The invention of claim 53 wherein said liner comprises polyolefin or polyester fibers.

55. The invention of claim 52, 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 cm.

56. The invention of claim 55 wherein the combined basis weight of said liner is preferably from about 30 to about 100 g/m².

57. The invention of claim 56 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.

58. The invention of claim 55 wherein either of said reinforcing and separation components contain an effective amount of surfactant or other finish to be made wettable.

59. The invention of claim 57 wherein either of said reinforcing and separation components comprise a carded, airlaid or spunbonded web of synthetic fibers.

60. The invention of claim 59 wherein either of said reinforcing and separation components comprises polyolefin or polyester fibers.

61. The invention of claim 60 wherein said fibers comprise from about 25 to about 50% polyester hollow fill staple fibers.

62. The invention of claim 60 wherein said fibers comprise more separation than about 50% polypropylene fibers.

63. The invention of claim 61 wherein said component contains from about 50-75% hollow fill polyester staple fibers from about 3-6 denier and about 1-2 inches in length.

64. The invention of claim 61 or 63 wherein said separation component contains polyester staple fibers about 1-3 inches in length from about 3-6 denier.

65. The invention of claim 58 wherein either of said reinforcing and separation components comprise from about 0.2 to 0.5% surfactant.

66. The invention of claim 52 wherein either of said reinforcing and separation component comprises a spunbonded web of synthetic fibers.

67. The invention of claim 66 wherein said spunbonded separation component is formed from a nonwoven web of filaments pun and collected without bonding then joined to said reinforcing component in fluid conductive contact therewith.

68. The invention of claim 67 wherein said separation and reinforcing components are joined together by thermal or ultrasonic bonds.

69. The invention of claim 68 wherein either of said reinforcing and separation components comprise polyolefin filaments.

70. The invention of claim 69 wherein said filament comprise polypropylene filaments.

71. The invention of claim 48 further Comprising side flaps extending from opposed lateral sides of said absorbent insert overlying and attached to either of said front and rear panels and said crotch section while said outer cover is stretched in an essentially cross-body direction.

72. The invention of claim 71 wherein said side flaps comprise extensions of said liner.