Activated carbon substrates

• US 8,168,852 B2
• Filed: 12/23/2004
• Issued: 05/01/2012
• 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
• Primary Examiner(s): Hand, Melanie
• Assistant Examiner(s): Craig, Paula
• Application Number:
  US11/021,547
• Publication Number:
  US 20060142709A1
• Time in Patent Office: 2,686 Days
• Field of Search: 604/359
• 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, the odor control coating comprising activated carbon, a binder, and a masking agent, wherein the binder comprises a water-soluble organic polymer and a polymer latex, wherein the polymer latex is sufficiently crosslinked to be substantially insoluble in water, and further wherein the masking agent comprises inorganic particles having an average size less than about 35 micrometers and the average size of the inorganic particles is less than the average size of the activated carbon.

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

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

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

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

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

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

8. The substrate of claim 1, wherein the polymer latex constitutes less than about 50 wt. % of the binder.

9. The substrate of claim 1, wherein the polymer latex constitutes less than about 25 wt. % of the binder.

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

11. The substrate of claim 10, wherein the 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 the polymer latex is selected from the group consisting of styrene-butadiene copolymers, polyvinyl acetate homopolymers, vinyl-acetate ethylene copolymers, vinyl-acetate acrylic copolymers, ethylene-vinyl chloride copolymers, ethylene-vinyl chloride-vinyl acetate terpolymers, acrylic polyvinyl chloride polymers, acrylic polymers, nitrile polymers, and combinations thereof.

13. The substrate of claim 1, wherein the inorganic particles comprise from about 20 wt. % to about 80 wt. % of the odor control coating.

14. The substrate of claim 1, wherein the inorganic particles are calcium carbonate particles.

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

16. The substrate of claim 1, wherein the odor control coating comprises a colorant.

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

18. An absorbent article that comprises a substrate, wherein the substrate contains an odor control coating that comprises activated carbon, a binder, and a masking agent, wherein the binder comprises a water-soluble organic polymer and a polymer latex, wherein the polymer latex is sufficiently crosslinked to be substantially insoluble in water, and further wherein the masking agent comprises inorganic particles having an average size less than about 35 micrometers and the average size of the inorganic particles is less than the average size of the activated carbon.

19. The absorbent article of claim 18, wherein the activated carbon comprises from about 1 wt. % to about 50 wt. % of the odor control coating.

20. The absorbent article of claim 18, wherein the activated carbon comprises from about 5 wt. % to about 20 wt. % of the odor control coating.

21. The absorbent article of claim 18, wherein the binder comprises less than about 40 wt. % of the odor control coating.

22. The absorbent article of claim 18, wherein the binder comprises from about 0.5 wt. % to about 25 wt. % of the odor control coating.

23. The absorbent article of claim 18, wherein the water-soluble organic polymer constitutes at least about 50 wt. % of the binder and the polymer latex constitutes less than about 50 wt. % of the binder.

24. The absorbent article of claim 18, wherein the water-soluble organic polymer includes a nonionic cellulosic ether.

25. The absorbent article of claim 18, wherein the polymer latex is selected from the group consisting of styrene-butadiene copolymers, polyvinyl acetate homopolymers, vinyl-acetate ethylene copolymers, vinyl-acetate acrylic copolymers, ethylene-vinyl chloride copolymers, ethylene-vinyl chloride-vinyl acetate terpolymers, acrylic polyvinyl chloride polymers, acrylic polymers, nitrile polymers, and combinations thereof.

26. The absorbent article of claim 18, wherein the inorganic particles comprise from about 20 wt. % to about 80 wt. % of the odor control coating.

27. The absorbent article of claim 18, wherein the inorganic particles are calcium carbonate particles.

28. The absorbent article of claim 18, wherein the solids add-on level is from about 20% to about 600%.

29. The absorbent article of claim 18, wherein the odor control coating comprises a colorant.

30. The absorbent article of claim 18, wherein the substrate contains a nonwoven web.

31. The absorbent article of claim 18, wherein the absorbent article contains a liquid-permeable layer and a liquid-impermeable layer.

32. The absorbent article of claim 31, wherein the liquid-permeable layer contains the substrate.

33. The absorbent article of claim 31, wherein the liquid-impermeable layer contains the substrate.

34. The absorbent article of claim 18, wherein the article is a diaper.