Activated carbon substrates

• US 20060142709A1
• Filed: 12/23/2004
• Published: 06/29/2006
• Est. Priority Date: 12/23/2004
• Status: Active Grant

• Current Assignee: Kimberly-Clark Worldwide Incorporated (Kimberly-Clark Corporation)
• Original Assignee: Kimberly-Clark Worldwide Incorporated (Kimberly-Clark Corporation)
• Inventors: Quincy, Roger Bradshaw III
• Granted Patent: US 8,168,852 B2
• Time in Patent Office: Days
• US Class Current: 604/359
• CPC Class Codes: A61L 15/18 containing inorganic materials
• CPC Class Codes: A61L 15/46 Deodorants or malodour counteractants, e.g. to inhibit the formation of ammonia or bacteria
• CPC Class Codes: A61L 2300/102 Metals or metal compounds, e.g. salts such as bicarbonates, carbonates, oxides, zeolites, silicates
• CPC Class Codes: A61L 2300/108 Elemental carbon, e.g. charcoal
• CPC Class Codes: A61L 2300/606 Coatings
• CPC Class Codes: A61L 2300/622 Microcapsules
• CPC Class Codes: Y10T 428/24901 including coloring matter

Abstract

A substrate that contains an odor control composition is provided. The odor control composition includes activated carbon for adsorbing one or more odorous compounds to reduce odor. The odor control composition also contains a water-soluble binder for increasing the durability of the activated carbon when applied to a substrate. In addition to improving durability, such a water-soluble binder may also provide good drapability and low residual odor in the resulting coated substrate.

Claims

1. A substrate that contains an odor control coating, said odor control coating comprising activated carbon, a binder, and a masking agent, said binder comprising a water-soluble organic polymer and said masking agent comprising masking particles having an average size less than the average size of said activated carbon.

2. The substrate of claim 1, wherein said activated carbon comprises from about 1 wt. % to about 50 wt. % of said odor control coating.

3. The substrate of claim 1, wherein said activated carbon comprises from about 5 wt. % to about 20 wt. % of said odor control coating.

4. The substrate of claim 1, wherein said binder comprises less than about 40 wt. % of said odor control coating.

5. The substrate of claim 1, wherein said binder comprises from about 0.5 wt. % to about 25 wt. % of said odor control coating.

6. The substrate of claim 1, wherein said binder further comprises a polymer latex.

7. The substrate of claim 1, wherein said water-soluble organic polymer constitutes at least about 50% of said binder.

8. The substrate of claim 1, wherein said water-soluble organic polymer constitutes at least about 90% of said binder.

9. The substrate of claim 1, wherein said binder consists essentially of said water-soluble organic polymer.

10. The substrate of claim 1, wherein said water-soluble organic polymer includes a nonionic cellulosic ether.

11. The substrate of claim 10, wherein said nonionic cellulosic ether is selected from the group consisting of alkyl cellulose ethers, hydroxyalkyl cellulose ethers, alkyl hydroxyalkyl cellulose ethers, and combinations thereof.

12. The substrate of claim 1, wherein said masking particles comprise from about 20 wt. % to about 80 wt. % of said odor control coating.

13. The substrate of claim 1, wherein said masking particles comprise from about 30 wt. % to about 70 wt. % of said odor control coating.

14. The substrate of claim 1, wherein said masking particles are inorganic particles.

15. The substrate of claim 14, wherein said inorganic particles are calcium carbonate particles.

16. The substrate of claim 1, wherein said masking particles have an average size of less than about 50 micrometers.

17. The substrate of claim 1, wherein said masking particles have an average size of less than about 20 micrometers.

18. The substrate of claim 1, wherein said masking particles are porous.

19. The substrate of claim 1, wherein the solids add-on level is from about 20% to about 600%.

20. The substrate of claim 1, wherein said odor control coating comprises a colorant.

21. The substrate of claim 1, wherein the substrate contains a nonwoven web.

22. A personal care absorbent article that comprises the substrate of claim 1.

23. A substrate that contains an odor control coating, said odor control coating comprising activated carbon in an amount from about 1 wt. % to about 50 wt. %, a binder in an amount less than about 40 wt. %, and inorganic masking particles in an amount from about 20 wt. % to about 80 wt. %, said binder comprising a nonionic cellulosic ether and said inorganic particles having an average size of less than about 35 micrometers.

24. The substrate of claim 23, wherein said activated carbon comprises from about 5 wt. % to about 20 wt. % of said odor control coating.

25. The substrate of claim 23, wherein said binder comprises from about 0.5 wt. % to about 25 wt. % of said odor control coating.

26. The substrate of claim 23, wherein said nonionic cellulosic ether constitutes at least about 90% of said binder.

27. The substrate of claim 23, wherein said binder consists essentially of said water-soluble organic polymer.

28. The substrate of claim 23, wherein said nonionic cellulosic ether is selected from the group consisting of alkyl cellulose ethers, hydroxyalkyl cellulose ethers, alkyl hydroxyalkyl cellulose ethers, and combinations thereof.

29. The substrate of claim 23, wherein said inorganic particles comprise from about 30 wt. % to about 70 wt. % of said odor control coating.

30. The substrate of claim 23, wherein said inorganic particles have an average size of less than about 20 micrometers.

31. The substrate of claim 23, wherein said inorganic particles contain calcium carbonate.

32. The substrate of claim 23, wherein the substrate contains a nonwoven web.

33. A substrate that contains an odor control coating, said odor control coating comprising activated carbon in an amount from about 1 wt. % to about 50 wt. %, a binder in an amount less than about 40 wt. %, and calcium carbonate particles in an amount from about 20 wt. % to about 80 wt. %, said binder comprising a nonionic cellulosic ether and said calcium carbonate particles having an average size of less than about 20 micrometers.

34. The substrate of claim 33, wherein said nonionic cellulosic ether constitutes at least about 90% of said binder.

35. The substrate of claim 33, wherein said binder consists essentially of said water-soluble organic polymer.

36. The substrate of claim 33, wherein the substrate contains a nonwoven web.