Absorbent laminate

• US 6,068,620 A
• Filed: 03/30/1998
• Issued: 05/30/2000
• Est. Priority Date: 03/30/1998
• Status: Expired due to Term

• Current Assignee: Paragon Trade Brands, LLC (Medtronic Plc)
• Original Assignee: Paragon Trade Brands Inc. (Johnson Controls International plc)
• Inventors: Chmielewski, Harry J.
• Primary Examiner(s): Weiss, John G.
• Assistant Examiner(s): PEPPERS III, MILEY CRAIG
• Application Number:
  US09/050,003
• Time in Patent Office: 792 Days
• Field of Search: 604/368, 604/359, 604/385.1, 604/385.2, 604/358, 604/367, 604/374, 604/369, 604/370, 604/371, 604/372, 604/373, 604/375, 604/378
• US Class Current: 604/378
• CPC Class Codes: A61F 13/15658 Forming continuous, e.g. composite, fibrous webs, e.g. involving the application of pulverulent material on parts thereof
• CPC Class Codes: A61F 13/4942 the barrier not being integral with the top- or back-sheet
• CPC Class Codes: A61F 13/53418 having a C-folded cross-section
• CPC Class Codes: A61F 13/53427 having an e-folded cross-section
• 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 2013/5307 characterized by the quantity or ratio of superabsorbent material
• CPC Class Codes: A61F 2013/53472 being a non-woven tissue wrapping the core
• CPC Class Codes: Y10T 428/269 including synthetic resin or polymer layer or component
• CPC Class Codes: Y10T 428/27 Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.]

Abstract

A disposable absorbent garment comprising a topsheet, a backsheet and an absorbent core disposed between the topsheet and backsheet is disclosed. The absorbent core is formed from at least one and preferably more than one laminate comprising three layers, including an upper layer, a lower layer and a central fibrous layer containing from about 50-95% by weight superabsorbent polymer. The upper and lower layers comprise tissue, airlaid fluff pulp or synthetic non-woven fibrous layers. The upper and lower layers together assist to maintain the integrity of the core during manufacture and in use, contain the superabsorbent polymer within the insult area of the garment and act to diffuse multiple insults so that gel blocking is minimized. The absorbent garment thus formed is very thin, lightweight and economical.

Claims

1. An absorbent article comprising:

a liquid permeable topsheet;

a liquid impermeable backsheet associated with said topsheet; and

an absorbent core positioned between the topsheet and the backsheet, the absorbent core comprising a first absorbent laminate, said first absorbent laminate comprising;

an upper layer near the topsheet;

a lower layer near the backsheet; and

an absorbent layer positioned between the upper and lower layers;

wherein

the side edges of said absorbent layer are substantially uncovered by said upper and lower layers;

said upper layer comprises a material selected from the group consisting essentially of tissue, airlaid fluff pulp and synthetic non-woven;

said lower layer comprises material selected from the group consisting essentially of tissue, airlaid fluff pulp and synthetic non-woven; and

said absorbent layer comprising about 50-95% SAP by weight and having a SAP efficiency (AUL) of at least 80%.

2. The absorbent article of claim 1, wherein said upper layer and said lower layer are hydrogen bonded to said absorbent layer.

3. The absorbent article of claim 1, said absorbent layer comprising fibers selected from the group consisting essentially of cellulose acetate fibers, rayon fibers, LYOCELL fibers, polyacrylonitrile fibers, cotton fibers and cotton linter fibers.

4. The absorbent article of claim 1, said absorbent layer comprising fibers selected from the group consisting essentially of surface modified (hydrophilic) polyester fibers, surface-modified polyolefin/polyester bicomponent fibers, and surface-modified polyester/polyester bicomponent fibers.

5. The absorbent article of claim 4, said absorbent layer having about 5-50% by weight concentration of fibers.

6. The absorbent article of claim 1, said first absorbent laminate having a total basis weight of about 100-400 grams per square meter.

7. The absorbent article of claim 6, said first absorbent laminate having a total basis weight of about 150-250 grams per square meter.

8. The absorbent article of claim 1, said absorbent layer further comprising up to 10% by weight fluff wood pulp fibers.

9. The absorbent article of claim 1, said absorbent layer further comprising up to 5% by weight thermally bondable fibers.

10. The absorbent article of claim 1, wherein the absorbent layer further comprises particulate additives.

11. The absorbent article of claim 10, said particulate additives comprising insoluble, hydrophilic polymers with particle diameters of 100 μ

m or less.

12. The absorbent article of claim 11, said particulate additives selected from the group consisting essentially of potato, corn, wheat, and rice starches, and partially cooked or modified starches.

13. The absorbent article of claim 1, said tissue, said airlaid fluff pulp and said synthetic nonwoven of said upper and lower layers having basis weights of about 10-40 grams per square meter, 30-120 grams per square meter and 10-80 grams per square meter, respectively.

14. The absorbent article of claim 1, further comprising a transfer layer positioned between said topsheet and said upper layer, said transfer layer adhesively secured to said upper layer and to said topsheet.

15. The absorbent article of claim 1, said absorbent layer further comprising particulate additives, wherein said particulate additives optimize separation of SAP particles.

16. The absorbent article of claim 15, said particulate additives comprising insoluble, hydrophilic polymers having particle diameters of about 100 μ

m or less.

17. The absorbent article of claim 16, said particulate additives selected from the group consisting essentially of potato, corn, wheat, and rice starches, and partially cooked or modified starches.

18. An absorbent article comprising:

a liquid permeable topsheet;

a liquid impermeable backsheet associated with said topsheet; and

an absorbent core positioned between the topsheet and the backsheet, the absorbent core including;

a central absorbent laminate comprising an absorbent layer sandwiched between an upper layer and a lower layer wherein the side edges of said absorbent layer are substantially uncovered by said upper and lower layers; and

a wrapping absorbent laminate substantially enclosing said central absorbent laminate;

said wrapping laminate comprises a second absorbent layer sandwiched between an outer layer and an inner layer wherein the side edges of said second absorbent layer are substantially uncovered by said outer and inner layers; and

said absorbent layers of said central laminate and said wrapping laminate comprising about 50-95% SAP by weight.

19. The absorbent article of claim 18, said absorbent layers having a SAP efficiency (AUL) of at least 80%.

20. The absorbent article of claim 18, said absorbent layers being formed from fibers selected from the group consisting essentially of cellulose acetate fibers, rayon fibers, LYOCELL fibers, polyacrylonitrile fibers, surface modified (hydrophilic) polyester fibers, surface-modified polyolefin/polyester bicomponent fibers, surface-modified polyester/polyester bicomponent fibers, cotton fibers.

21. The absorbent article of claim 18, wherein the absorbent layers further comprise particulate additives.

22. The absorbent article of claim 21, said particulate additives comprising insoluble, hydrophilic polymers with particle diameters of 100 μ

m or less.

23. The absorbent article of claim 22, said particulate additives selected from the group consisting essentially of potato, corn, wheat, and rice starches, and partially cooked or modified starches.

24. The absorbent article of claim 18, wherein said central absorbent laminate has a length which is about half the length of said wrapping absorbent laminate.

25. An absorbent laminate for absorbent garments comprising:

a central absorbent layer formed from about 75-95% by weight superabsorbent polymer and 5-25% by weight concentration additives;

an upper layer positioned above said central absorbent layer, said upper layer selected from the group consisting essentially of airlaid fluff pulp, synthetic non-woven and tissue; and

a lower layer positioned below said central absorbent layer, said lower layer selected from the group consisting essentially of airlaid fluff pulp, synthetic non-woven and tissue;

wherein the side edges of said absorbent layer are substantially uncovered by said upper and lower layers.

26. The absorbent laminate of claim 25, said additives comprising fibrous additives selected from the group consisting essentially of cellulose acetate fibers, rayon fibers, LYOCELL fibers, polyacrylonitrile fibers, surface modified (hydrophilic) polyester fibers, surface-modified polyolefin/polyester bicomponent fibers, surface-modified polyester/polyester bicomponent fibers, and cotton fibers.

27. An absorbent core for absorbent garments comprising:

an absorbent laminate comprising an absorbent layer sandwiched between an upper layer and a lower layer;

wherein

the side edges of said absorbent layer of said absorbent laminate are substantially uncovered by said upper and lower layers;

said absorbent layer of said absorbent laminate formed from about 75-95% by weight super absorbent polymer (SAP) and about 5-25% by weight concentration additives;

said upper and lower layers of said absorbent laminate selected from the group consisting essentially of airlaid fluff pulp, synthetic non-woven, and tissue; and

an upper absorbent layer positioned above said absorbent laminate, said upper absorbent layer comprising cellulose fibers;

wherein

said absorbent laminate has a width dimension which is substantially constant along its length and said upper absorbent layer has varying width dimensions along the longitudinal length thereof.

28. The absorbent core of claim 27, said additives comprising fibrous additives selected from the group consisting essentially of cellulose acetate fibers, rayon fibers, LYOCELL fibers, polyacrylonitrile fibers, surface-modified (hydrophilic) polyester fibers, surface-modified polyolefin/polyester bicomponent fibers, surface-modified polyester/polyester bicomponent fibers, and cotton fibers.

29. The absorbent core of claim 27, wherein said upper absorbent layer has a length dimension which is about half that of said absorbent laminate.

30. The absorbent core of claim 27, wherein said absorbent laminate has a length dimension which is about half that of said upper absorbent layer.

31. The absorbent core of claim 27, said absorbent core adapted to be positioned in a diaper, wherein the diaper includes opposing waist regions and a narrow crotch region, said width dimension of said absorbent laminate being equal to or less than the width dimension of the crotch of the diaper.

32. The absorbent core of claim 27, said upper absorbent layer further comprising super absorbent polymer positioned adjacent to said cellulose fibers.