Absorbent polymer compositions having high sorption capacities under an applied pressure and improved integrity when wet

• US 6,121,509 A
• Filed: 01/07/1998
• Issued: 09/19/2000
• Est. Priority Date: 01/07/1998
• Status: Expired due to Term

• Current Assignee: The Procter & Gamble Company
• Original Assignee: The Procter & Gamble Company
• Inventors: Ashraf, Arman, Hird, Bryn
• Primary Examiner(s): ZIRKER, DANIEL R
• Application Number:
  US09/003,918
• Time in Patent Office: 986 Days
• Field of Search: 442/301, 442/414, 604/358, 604/367, 604/368, 604/372, 604/374, 604/375, 428/913
• US Class Current: 604/368
• CPC Class Codes: A61L 15/60 Liquid-swellable gel-forming materials, e.g. super-absorbents
• CPC Class Codes: C08L 101/14 the macromolecular compounds being water soluble or water swellable, e.g. aqueous gels
• CPC Class Codes: Y10T 442/3976 Including strand which is stated to have specific attributes [e.g., heat or fire resistance, chemical or solvent resistance, high absorption for aqueous composition, water solubility, heat shrinkability, etc.]

Abstract

Disclosed in the present application are absorbent materials useful in the containment of body fluids such as urine. In particular, the invention relates to absorbent polymer compositions having excellent absorbency performance properties in terms of absorbent capacity under a confining pressure of 0.7 psi, as well has excellent integrity in the swollen state. The invention further relates to absorbent members comprising these absorbent polymer compositions, and to absorbent articles comprising the absorbent members.

Claims

1. An absorbent polymer composition, said polymer composition consisting essentially of absorbent polymers, each of said polymers being capable of absorbing at least 10 times its weight in deionized water, allowing for adjustment of the pH of the system, wherein said polymer composition has a Performance Under Pressure (PUP) capacity in synthetic urine solution of at least about 39 g/g under a confining pressure of 0.7 psi after 4 hours, and a Ball Burst Strength (BBS) value of at least about 50 gf.

2. The absorbent polymer composition of claim 1 having a PUP capacity of at least about 41 g/g under a confining pressure of 0.7 psi after 4 hours.

3. The absorbent polymer composition of claim 2 having a PUP capacity of at least about 43 g/g under a confining pressure of 0.7 psi after 4 hours.

4. The absorbent polymer composition of claim 3 having a PUP capacity of at least about 44 g/g under a confining pressure of 0.7 psi after 4 hours.

5. The absorbent polymer composition of claim 1 having a PUP capacity of from about 39 g/g to about 58 g/g under a confining pressure of 0.7 psi after 4 hours.

6. The absorbent polymer composition of claim 5 having a PUP capacity of from about 41 g/g to about 55 g/g under a confining pressure of 0.7 psi after 4 hours.

7. The absorbent polymer composition of claim 6 having a PUP capacity of from about 43 g/g to about 50 g/g, under a confining pressure of 0.7 psi after 4 hours.

8. The absorbent polymer composition of claim 1 having a BBS value of at least about 100 gf.

9. The absorbent polymer composition of claim 8 having a BBS value of at least about 150 gf.

34. An absorbent member for the containment of aqueous body fluids, which comprises at least one region comprising the absorbent polymer composition of claim 1.

38. An absorbent article comprising a liquid pervious topsheet, a backsheet and an absorbent core positioned between the topsheet and the backsheet, wherein the absorbent core comprises the absorbent member of claim 34.

10. An absorbent polymer composition, said polymer composition consisting essentially of absorbent polymers, each of said polymers being capable of absorbing at least 10 times its weight in deionized water, allowing for adjustment of the pH of the system, wherein said polymer composition has a PUP capacity in synthetic urine solution of at least about 36 g/g under a confining pressure of 0.7 psi after 4 hours, and a BBS value of at least about 100 gf.

11. The absorbent polymer composition of claim 10 having a PUP capacity of at least about 38 g/g under a confining pressure of 0.7 psi after 4 hours.

12. The absorbent polymer composition of claim 11 having a PUP capacity of at least about 40 g/g under a confining pressure of 0.7 psi after 4 hours.

13. The absorbent polymer composition of claim 12 having a PUP capacity of at least about 42 g/g under a confining pressure of 0.7 psi after 4 hours.

14. The absorbent polymer composition of claim 10 having a PUP capacity of from about 36 g/g to about 58 g/g under a confining pressure of 0.7 psi after 4 hours.

15. The absorbent polymer composition of claim 14 having a PUP capacity of from about 38 g/g to about 55 g/g under a confining pressure of 0.7 psi after 4 hours.

16. The absorbent polymer composition of claim 15 having a PUP capacity of from about 40 g/g to about 50 g/g, under a confining pressure of 0.7 psi after 4 hours.

17. The absorbent polymer composition of claim 10 having a BBS value of at least about 150 gf.

18. The absorbent polymer composition of claim 17 having a BBS value of at least about 200 gf.

35. An absorbent member for the containment of aqueous body fluids, which comprises at least one region comprising the absorbent polymer composition of claim 10.

39. An absorbent article comprising a liquid pervious topsheet, a backsheet and an absorbent core positioned between the topsheet and the backsheet, wherein the absorbent core comprises the absorbent member of claim 35.

19. An absorbent polymer composition, said polymer composition consisting essentially of absorbent polymers, each of said polymers being capable of absorbing at least 10 times its weight in deionized water, allowing for adjustment of the pH of the system, wherein said polymer composition has a PUP capacity in synthetic urine solution of at least about 33 g/g under a confining pressure of 0.7 psi after 4 hours, and a BBS value of at least about 150 gf.

20. The absorbent polymer composition of claim 19 having a PUP capacity of at least about 35 g/g under a confining pressure of 0.7 psi after 4 hours.

21. The absorbent polymer composition of claim 20 having a PUP capacity of at least about 37 g/g under a confining pressure of 0.7 psi after 4 hours.

22. The absorbent polymer composition of claim 21 having a PUP capacity of at least about 40 g/g under a confining pressure of 0.7 psi after 4 hours.

23. The absorbent polymer composition of claim 19 having a PUP capacity of from about 33 g/g to about 58 g/g under a confining pressure of 0.7 psi after 4 hours.

24. The absorbent polymer composition of claim 23 having a PUP capacity of from about 35 g/g to about 55 g/g under a confining pressure of 0.7 psi after 4 hours.

25. The absorbent polymer composition of claim 24 having a PUP capacity of from about 37 g/g to about 50 g/g, under a confining pressure of 0.7 psi after 4 hours.

26. The absorbent polymer composition of claim 19 having a BBS value of at least about 200 gf.

36. An absorbent member for the containment of aqueous body fluids, which comprises at least one region comprising the absorbent polymer composition of claim 19.

40. An absorbent article comprising a liquid pervious topsheet, a backsheet and an absorbent core positioned between the topsheet and the backsheet, wherein the absorbent core comprises the absorbent member of claim 36.

27. An absorbent polymer composition, said polymer composition consisting essentially of absorbent polymers, each of said polymers being capable of absorbing at least 10 times its weight in deionized water, allowing for adjustment of the pH of the system, wherein said polymer composition has a PUP capacity in synthetic urine solution of at least about 30 g/g under a confining pressure of 0.7 psi after 4 hours, and a BBS value of at least about 200 gf.

28. The absorbent polymer composition of claim 27 having a PUP capacity of at least about 32 g/g under a confining pressure of 0.7 psi after 4 hours.

29. The absorbent polymer composition of claim 28 having a PUP capacity of at least about 34 g/g under a confining pressure of 0.7 psi after 4 hours.

30. The absorbent polymer composition of claim 29 having a PUP capacity of at least about 37 g/g under a confining pressure of 0.7 psi after 4 hours.

31. The absorbent polymer composition of claim 27 having a PUP capacity of from about 30 g/g to about 58 g/g under a confining pressure of 0.7 psi after 4 hours.

32. The absorbent polymer composition of claim 31 having a PUP capacity of from about 32 g/g to about 55 g/g under a confining pressure of 0.7 psi after 4 hours.

33. The absorbent polymer composition of claim 32 having a PUP capacity of from about 34 g/g to about 50 g/g, under a confining pressure of 0.7 psi after 4 hours.

37. An absorbent member for the containment of aqueous body fluids, which comprises at least one region comprising the absorbent polymer composition of claim 27.

41. An absorbent article comprising a liquid pervious topsheet, a backsheet and an absorbent core positioned between the topsheet and the backsheet, wherein the absorbent core comprises the absorbent member of claim 37.