Cellulosic fibers with odor control characteristics
View Patent ↗An odor-inhibiting fiber having a cellulosic fiber and an odor-inhibiting formulation. The odor-inhibiting formulation may contain an odor-inhibiting agent, such as a biocide, an enzyme, a urease inhibitor. The odor-inhibiting formulation also may contain a liquid carrier such as a hydrophobic or hydrophilic organic liquid, or a mixture of a hydrophobic and hydrophilic organic liquid. The cellulosic fiber is impregnated with the odor-inhibiting formulation to produce fiber having odor-inhibiting characteristics. The resultant odor-inhibiting fiber is useful in making absorbent articles with odor-inhibiting characteristics. The fiber of the embodiments prevents odor by inhibiting bacteria growth and ammonia production, especially when used in an absorbent article such as a diaper or adult incontinence device.
1. An odor-inhibiting absorbent fiber composition comprising:
a pulp sheet of cellulosic fibers impregnated with a non-fiber-swelling odor-inhibiting formulation comprising a non-water liquid carrier that is liquid at room temperature and has less than 20 weight % water, and an odor-inhibiting agent that is a biocide;
wherein the odor-inhibiting fiber composition comprises from about 0.005 weight % to about 0.5 weight % biocide, and from about 0.025 weight % to about 1.0 weight % non-water liquid carrier, based on the dry weight of the odor-inhibiting fiber composition.
2. The odor-inhibiting fiber of claim 1 , wherein the odor-inhibiting agent is a biocide selected from the group consisting of a glutaraldehyde, an analide (C 6 H 5 NHCOR), a biguanide, hexachlorophene, 4-chloro-3,5-dimethylphenol, 5-chloro-2-(2,4-dichlorophenoxy)phenol, trichlorocarbanalide, hexachlorophene, chlorhexidine, benzylquaternium salts, N-(4-chlorophenyl)-N′-(3,4-dichlorophenyl)-urea, 2,4,4′-trichloro-2′-hydroxy diphenyl ether (triclosan), 4-chloro-3,5-dimethyl phenol, 2,2′-methylene-bis-(6-bromo-4-chlorophenol), 3-methyl-4-(1-methylethyl)-phenol, 2-benzyl-4-chlorophenol, 3-(4-chlorophenoxy)-propane-1,2-diol, chlorohexidine, 3,4,4′-trichlorocarbanilide (TTC), 3,4,4′-trichlorobanilide, chitosan or chitin derivatives, diglycerol monocaprate (DMC), zinc salts, dodecane-1,2-diol, salicylic acid-N-alkyl amides where the alkyl groups contain 1 to 22 carbon atoms linear or branched, hexadecyltrimethyl ammonium bromide, and combinations and mixtures thereof.
3. The odor-inhibiting fiber of claim 1 , wherein the odor-inhibiting agent is a urease inhibitor selected from the group consisting of N-(n-butyl)thiophosphoric triamide, cyclohexylphosphoric triamide, phenyl phosphorodiamidate, an alkali metal fluoride, an alkali metal bisulfite, an alkali metal borates, boric acid, Yucca schidigera, and combinations and mixtures thereof.
4. The odor-inhibiting fiber of claim 1 , wherein the odor-inhibiting agent is the enzyme lysozyme.
5. The odor-inhibiting fiber of claim 1 , wherein the odor-inhibiting formulation comprises about 0.1 weight % to about 50 weight % odor-inhibiting agent.
6. The odor-inhibiting fiber of claim 1 , wherein the liquid carrier comprises a hydrophobic liquid carrier that is sparingly soluble in water.
7. The odor-inhibiting fiber of claim 6 , wherein the hydrophobic liquid carrier is an ether or an ester of polyhydric alcohol, having an alkyl moiety of 3 or more carbon atoms.
8. The odor-inhibiting fiber of claim 6 , wherein the hydrophobic liquid carrier is selected from the group consisting of triacetin, diacetin, propylene carbonate, and combinations and mixtures of thereof.
9. The odor-inhibiting fiber of claim 1 , wherein the liquid carrier comprises a hydrophilic liquid carrier.
10. The odor-inhibiting fiber of claim 9 , wherein the hydrophilic liquid carrier is a monohydric alcohol, a polyhydric alcohol, or an amino alcohol, having an alkyl group with two or more carbon atoms.
11. The odor-inhibiting fiber of claim 9 , wherein the hydrophilic liquid carrier is selected from the group consisting of 1,4-cyclohexanedimethanol (1,4-CHDM), pentaerythritol, polyethylene glycol, glycerol, propylene glycol, di-propylene glycol, tri-propylene glycol, polypropylene glycols, diethanolamine, diethanolamine, diglycolamine, and combinations and mixtures thereof.
12. The odor-inhibiting fiber of claim 1 , wherein the liquid carrier comprises material able to covalently bond to cellulosic fibers or to both cellulosic fibers and the odor-inhibiting agent.
13. The odor-inhibiting fiber of claim 12 , wherein the liquid carrier comprises a material selected from the group consisting of a mono- or poly-functional epoxy, a mono- or poly-functional aldehyde, a ketone, and combinations and mixtures thereof.
14. The odor-inhibiting fiber of claim 11 , wherein the liquid carrier comprises 1,4-CHDM and less than 10% water.
15. The odor-inhibiting fiber of claim 13 , wherein the liquid carrier comprises a material selected from a group consisting of 1,4-cyclohexanedimethanol diglycidyl ether, glycerol propoxylate triglycidyl ether, 1,4-butanediol diglycidyl ether, polypropyleneglycol diglycidyl ether, glyoxal, glutaraldehyde, glyceraldehyde, and combinations and mixtures thereof.
16. The odor-inhibiting fiber of claim 1 , wherein the liquid carrier comprises a mixture of a hydrophobic liquid carrier and a hydrophilic liquid carrier in a ratio ranging from about 1:10 by weight to about 10:1 by weight of the hydrophobic carrier to the hydrophilic carrier.
17. The odor-inhibiting fiber of claim 1 , wherein the liquid carrier comprises a mixture of triacetin and 1,4-cyclohexanedimethanol (1,4-CHDM) in a ratio ranging from about 1:10 by weight to 10:1 by weight of triacetin to 1,4-CHDM.
18. The odor-inhibiting fiber of claim 1 , wherein the liquid carrier comprises a material selected from the group consisting of 1,4-cyclohexanedimethanol (1,4-CHDM), triacetin, diacetin, propylene carbonate, polyethylene glycol, polypropylene glycol, and combinations and mixtures thereof.
19. The odor-inhibiting fiber of claim 1 , wherein the formulation comprises about 0.1 weight % to about 50.0 weight % of the odor-inhibiting agent, and from about 50.0 weight % to about 99.9 weight % of the liquid carrier.
20. The odor-inhibiting fiber of claim 1 , wherein the odor-inhibiting formulation further comprises an odor absorbent selected from the group consisting of cyclodextrin, ethylenediamine tetra-acetic acid, chelating agents, zeolites, activated silica, activated carbon granules and combinations and mixtures thereof.
21. The odor-inhibiting fiber of claim 20 , wherein the odor-inhibiting formulation comprises about 0.1 weight % to about 20 weight % of an odor absorbent based on the total weight of the odor-inhibiting formulation.
22. The odor-inhibiting fiber of claim 1 , wherein the odor-inhibiting agent is hydrophobic and the liquid carrier is hydrophobic.
23. The odor-inhibiting fiber of claim 1 , wherein the odor-inhibiting agent is triclosan and the liquid carrier is triacetin.
24. The odor-inhibiting fiber of claim 1 , wherein the cellulosic fiber is a conventional cellulose fiber.
25. The odor-inhibiting fiber of claim 24 , wherein the conventional cellulose fiber is obtained from a hardwood cellulose pulp, a softwood cellulose pulp, cotton linters, bagasse, kemp, flax, grass, or a combination or mixture thereof.
26. The odor-inhibiting fiber of claim 1 , wherein the cellulosic fiber is a cross-linked cellulose fiber.
27. The odor-inhibiting fiber of claim 1 , wherein the fiber, when dosed with a bacterial suspension of Proteus mirabilis in urine, prevents bacteria growth for up to about 24 hours.
28. The odor-inhibiting fiber of claim 1 , wherein the fiber, when dosed with a bacterial suspension of Proteus mirabilis in urine, maintains an ammonia level below 100 ppm for up to about 24 hours.
29. The odor-inhibiting fiber of claim 1 , wherein the fiber, when dosed with a bacterial suspension of Proteus mirabilis in urine, maintains a pH below about 7.0 for up to about 24 hours.
30. The odor-inhibiting fiber of claim 1 , wherein the fiber, when dosed with a bacterial suspension of Proteus mirabilis in urine, prevents ammonia generation for up to about 24 hours.
31. The odor-inhibiting fiber of claim 1 , wherein the fiber, when dosed with a bacterial suspension of Proteus mirabilis in urine, prevents ammonia generation for up to about 36 hours.
32. An absorbent article comprising one or more fluff pulp fibers extracted from the odor-inhibiting fiber composition of claim 1 .
33. The absorbent article of claim 32 , wherein the absorbent article is selected from the group consisting of a diaper, an incontinent device, a feminine hygiene product, a wipe, a bandage, a bed pad, and any combination thereof.
34. The odor inhibiting fiber of claim 1 , wherein the odor-inhibiting formulation comprises a triclosan odor-inhibiting agent and a liquid carrier.
35. The odor inhibiting fiber of claim 34 , comprising from about 0.005 wt % to about 0.05 wt % triclosan, and from about 0.05 wt % to about 0.5 wt % liquid carrier, based on the dry weight of the odor-inhibiting fiber composition.
36. The odor inhibiting fiber of claim 34 , wherein the liquid carrier comprises triacetin, glycerol, polypropylene glycol, propylene glycol, di-propylene glycol, tri-propylene glycol, polyethylene glycol, or combinations or mixtures thereof.
37. The odor inhibiting fiber of claim 36 , wherein the liquid carrier comprises polypropylene glycol having a molecular weight of less than about 500.
38. The odor inhibiting fiber of claim 1 , wherein the odor-inhibiting formulation comprises a peroxide odor-inhibiting agent and a liquid carrier.
39. The odor inhibiting fiber of claim 38 , comprising from about 0.01 wt % to about 1.0 wt % peroxide, and from about from about 0.05 wt % to about 3.0 wt % liquid carrier, based on the dry weight of the odor-inhibiting fiber composition.
40. The odor inhibiting fiber of claim 39 , further comprising a peroxide stabilizer, wherein the molar ratio of peroxide to peroxide stabilizer is from about 1:10 to about 10:1.
41. The odor inhibiting fiber of claim 40 , wherein the peroxide stabilizer comprises an organic acid with multicarboxyl groups selected from the group consisting of oxalic acid, malonic acid, succinic acid, maleic acid, lactic acid, adipic acid, tartaric acid, citric acid, and combinations and mixtures thereof.
42. The odor-inhibiting fiber of claim 1 , wherein the odor-inhibiting agent is a biocide selected from the group consisting of a peroxide, a peracid, and combinations and mixtures thereof.
43. The odor-inhibiting fiber of claim 1 , wherein said liquid carrier does not comprise water.
44. The odor-inhibiting fiber of claim 43 , wherein the hydrophilic liquid carrier is selected from the group consisting of 1,4-cyclohexanedimethanol (1,4-CHDM), pentaerythritol, polyethylene glycol, glycerol, propylene glycol, di-propylene glycol, tri-propylene glycol, polypropylene glycols, diethanolamine, diethanolamine, diglycolamine, and combinations and mixtures thereof.
45. The odor-inhibiting fiber of claim 42 , wherein the biocide is hydrogen peroxide.
46. The odor-inhibiting fiber of claim 45 , wherein the odor-inhibiting formulation further comprises a stabilizing agent.
47. The odor-inhibiting fiber of claim 46 , wherein the stabilizing agent is a transition metal chelator, a picolinic acid, or an organic acid with multicarboxyl groups selected from the group consisting of oxalic acid, malonic acid, succinic acid, maleic acid, lactic acid, adipic acid, tartaric acid, citric acid, and combinations and mixtures thereof.
48. The odor-inhibiting fiber of claim 46 , wherein the stabilizing agent is selected from the group consisting of a phosphate, a sulfate, a silicate salt of sodium, magnesium, potassium, or calcium, and combinations and mixtures thereof.
49. The odor-inhibiting fiber of claim 46 , wherein the stabilizing agent is present in a molar ratio of about 1:10 to about 10:1, of stabilizer to peroxide.
50. The odor inhibiting fiber of claim 47 , wherein said fiber comprises from about 0.01% to about 1.0% peroxide; and wherein the stabilizing agent comprises an organic acid with multicarboxyl groups selected from the group consisting of oxalic acid, malonic acid, succinic acid, maleic acid, lactic acid, adipic acid, tartaric acid, citric acid, and combinations and mixtures thereof.
51. The odor inhibiting fiber of claim 46 , comprising from about 0.01% to about 1.0% hydrogen peroxide, and a lactic acid stabilizing agent.
52. The odor inhibiting fiber of claim 51 , wherein the molar ratio of peroxide to peroxide stabilizer is from about 1:10 to about 10:1.