Absorbent article which includes superabsorbent material and hydrophilic fibers located in discrete pockets

• US 5,425,725 A
• Filed: 01/29/1993
• Issued: 06/20/1995
• Est. Priority Date: 10/29/1993
• Status: Expired due to Term

• Current Assignee: Kimberly-Clark Worldwide Incorporated (Kimberly-Clark Corporation)
• Original Assignee: Kimberly-Clark Corporation
• Inventors: Sallee, Lorry F., Pomplun, William S., Abuto, Frank P., Kellenberger, Stanley R., Rippl, Carl G., Robinson, Mark L., Zenker, David L., Tanzer, Richard W., Laux, Daniel R., Yarbrough, Sandra M., Nortman, Brian K., Schroeder, Wen Z.
• Primary Examiner(s): Green, Randall L.
• Assistant Examiner(s): ZUTTARELLI, ANTHONY
• Application Number:
  US08/145,927
• Time in Patent Office: 872 Days
• Field of Search: 604/358, 604/368, 604/364, 604/367, 604/365, 604/372, 604/378, 604/382, 604/385.1
• US Class Current: 604/368
• CPC Class Codes: A61F 13/5323 having absorbent material located in discrete regions, e.g. pockets
• CPC Class Codes: A61F 2013/51377 having decoration properties
• CPC Class Codes: A61F 2013/53916 with epicyclical pattern
• CPC Class Codes: A61F 2013/53933 with water-soluble binder

Abstract

An absorbent article comprises a first, liquid-permeable carrier layer and at least a second carrier layer. A carrier attaching mechanism, such as a water-sensitive adhesive, secures together the carrier layers to provide substantially attached zones and a multiplicity of substantially unattached zones thereof. The substantially unattached zones provide a plurality of pocket regions, and a high-absorbency material is located within the pocket regions to provide an absorbent laminate. Matrix fibers are dispersed within the high-absorbency material in the pocket regions, and the matrix fibers are present in a selected amount which, in particular aspects of the invention, can be within the range of about 0.1-10 weight percent, as determined with respect to the total weight of the absorbent material contained in the pockets.

Claims

1. An absorbent article, comprising:

a first, liquid-permeable carrier layer and at least a second carrier layer;

water-sensitive carrier attaching means for securing together said carrier layers at substantially attached zones thereof, said carrier layers having substantially unattached zones providing a plurality of pocket regions with said substantially attached zones located between said pocket regions;

high-absorbency material located within said pocket regions to provide an absorbent laminate; and

airlaid matrix fibers dispersed within said high-absorbency material in said pocket regions, said matrix fibers present in an average amount which is not more than about 10 weight percent, as determined with respect to the total weight of the absorbent material contained in the pockets;

wherein, said water-sensitive carrier attaching means in said substantially attached zones provides a wet strength adequate to hold said carrier layers together when wet, and wherein said wet strength is less than a separating force imparted by a swelling of said high-absorbency material when said high-absorbency material is exposed to an aqueous liquid.

2. An absorbent article as recited in claim 1, wherein said matrix fibers are present in an average amount which is not less than about 3 wt % and not more than about 7 wt %.

3. An absorbent article as recited in claim 1, wherein said matrix fibers are wettable.

4. An absorbent article, as recited in claim 1, wherein said water-sensitive attachment means provides a wet bond strength of not less than about 0.04 N/cm.

5. An absorbent article as recited in claim 1, wherein said water-sensitive attachment means provides a wet bond strength of not less than about 0.07 N/cm.

6. An absorbent article as recited in claim 1, wherein said matrix fibers have a length within the range of about 0.5-5 mm and a fiber diameter within the range of about 10-50 micrometers.

7. An absorbent article as recited in claim 6, wherein said matrix fibers are cellulosic fibers.

8. An absorbent article as recited in claim 1, wherein said matrix fibers have a fiber length within the range of about 3-25 mm and a fiber diameter within the range of about 10-600 micrometers.

9. An absorbent article as recited in claim 8, wherein said matrix fibers are synthetic fibers.

10. An absorbent article, as recited in claim 1, wherein said first carrier layer has a burst strength of at least about 0.08 N/cm.

11. An absorbent article, as recited in claim 10, wherein said second carrier layer has a burst strength of at least about 0.08 N/cm.

12. An absorbent article as recited in claim 1, wherein said water-sensitive attachment means provides a wet bond strength of not less than about 0.09 N/cm.

13. An absorbent article as recited in claim 12, wherein said water-sensitive attachment means provides a wet bond strength of not more than about 2 N/cm.

14. An absorbent article as recited in claim 12, wherein said water-sensitive attachment means provides a wet bond strength of not more than about 1 N/cm.

15. An absorbent article, as recited in claim 1, wherein said water-sensitive attachment means is configured to release at an applied load which is less than a load needed to delaminate said attachment means without excessively tearing at least one of said carrier layers when said carrier layers are wetted with an aqueous liquid.

16. An absorbent article, as recited in claim 10, wherein said water-sensitive attachment means provides a wet bond strength of not more than about 5 N/cm.

17. An absorbent article, as recited in claim 16, wherein said water-sensitive attaching means provides a dry bond strength of at least about 0.05 N/cm.

18. An absorbent article, as recited in claim 17, wherein said first carrier layer comprises a wettable fibrous web.

19. An absorbent article, as recited in claim 18, wherein said second carrier layer is liquid permeable and comprises a wettable, fibrous web.

20. An absorbent article, as recited in claim 19, wherein at least one of said carrier layers is a web which includes meltblown fibers and wherein said meltblown web is configured to provide water-sensitivity to said water-sensitive attaching means.

21. An absorbent article, as recited in claim 1, wherein said pocket regions are spaced apart from one another by a distance of not less than about 0.15 cm.

22. An absorbent article, as recited in claim 21, wherein immediately adjacent pocket regions are spaced apart from each other by a distance of not more than about 3 cm.

23. An absorbent article, as recited in claim 22, further comprising a surge management layer positioned generally adjacent a major bodyside surface of said absorbent laminate.

24. An absorbent article, as recited in claim 23, wherein said surge management layer is composed of a nonwoven fibrous web composed of synthetic fibers and having a basis weight within the range of about 24-300 gsm.

25. An absorbent article, as recited in claim 23, further comprising a distribution layer positioned next to a major outerside surface of said absorbent laminate.