Depilatory compositions and articles and the use thereof
View Patent ↗The present invention relates to a composition or article containing at least one oxidizing agent and at least one reducing agent, wherein at least one of the at least one reducing agent is a depilatory agent, the equivalent ratio of the at least one oxidizing agent to the at least one reducing agent is less than 1:1, and the article is exothermic when wet with water, and the use thereof to remove hair from the skin.
1. A method of removing hair from the skin, said method comprising applying to said hair a substantially dry article comprising an insoluble substrate, at least one oxidizing agent, and at least one reducing agent, wherein at least one of said at least one reducing agent is a depilatory agent, the equivalent ratio of said at least one oxidizing agent to said at least one reducing agent is less than 1:1, and said article is exothermic when wet with water and, wherein said article is wet with water prior to, during, or after said application.
2. The method of claim 1 wherein said substrate comprises a nonwoven sheet.
3. The method of claim 1 wherein said at least one oxidizing agent comprises at least one compound selected from the group consisting of sodium perborate monohydrate, ammonium persulfate, sodium persulfate, potassium persulfate, sodium carbonate peroxide, calcium peroxide, magnesium peroxide, and carbamide peroxide.
4. The method of claim 1 wherein said at least one reducing agent comprises a compound selected from the group consisting of thioglycolic acid, thioethylene glycol, thioglycerol, thioethanol, thioactic acid, thiosalicylic acid, L-cysteine, D-cysteine, DL-cysteine, N-acetyl-L-cysteine, DL-homocysteine, N-carbamoyl cysteine, glutathion, cysteamine, salts and esters thereof, and sulfide salts.
5. The method of claim 3 wherein said at least one reducing agent comprises a compound selected from the group consisting of thioglycolic acid, thioethylene glycol, thioglycerol, thioethanol, thioactic acid, thiosalicylic acid, L-cysteine, D-cysteine, DL-cysteine, N-acetyl-L-cysteine, DL-homocysteine, N-carbamoyl cysteine, glutathion, cysteamine, salts and esters thereof, and sulfide salts.
6. The method of claim 3 wherein said at least one reducing agent comprises a compound selected from the group consisting of thioglycolic acid and salts and esters thereof.
7. The method of claim 1 wherein the equivalent ratio of said at least one oxidizing agent to said at least one reducing agent ranges from 1:1.5 to 1:10.
8. The method of claim 1 wherein following being wet with water, a surface of said article becomes heated to from about 30° C. to about 50° C.
9. The method of claim 1 said article further comprising a water-soluble polymer in contact with said at least one oxidizing agent, said at least one reducing agent, or both said at least one oxidizing agent and said at least one reducing agent.
10. The method of claim 9 wherein said water-soluble polymer is selected from the group consisting of polyethylene glycol, polyethylene oxide, polyvinyl alcohol, cellulose ethers, polyvinylpyrrolidone, copolymers of vinylpyrrolidone, and mixtures thereof.
11. A method of removing hair from the skin, said method comprising wetting a composition with water prior to, during, or after application of said composition to said hair, wherein said composition comprises at least one oxidizing agent and at least one reducing agent, at least one of said at least one reducing agent is a depilatory agent, the equivalent ratio of said at least one oxidizing agent to said at least one reducing agent is less than 1:1, and said composition is exothermic when wet with water.
12. The method of claim 11 wherein said composition is applied to a substrate prior to application to the skin.
13. The method of claim 11 wherein said at least one oxidizing agent comprises at least one compound selected from the group consisting of sodium perborate monohydrate, ammonium persulfate, sodium persulfate, potassium persulfate, sodium carbonate peroxide, calcium peroxide, magnesium peroxide, and carbamide peroxide.
14. The method of claim 11 wherein said at least one reducing agent comprises a compound selected from the group consisting of thioglycolic acid, thioethylene glycol, thioglycerol, thioethanol, thioactic acid, thiosalicylic acid, L-cysteine, D-cysteine, DL-cysteine, N-acetyl-L-cysteine, DL-homocysteine, N-carbamoyl cysteine, glutathion, cysteamine, salts and esters thereof, and sulfide salts.
15. The method of claim 13 wherein said at least one reducing agent comprises a compound selected from the group consisting of thioglycolic acid, thioethylene glycol, thioglycerol, thioethanol, thioactic acid, thiosalicylic acid, L-cysteine, D-cysteine, DL-cysteine, N-acetyl-L-cysteine, DL-homocysteine, N-carbamoyl cysteine, glutathion, cysteamine, salts and esters thereof, and sulfide salts.
16. The method of claim 13 wherein said at least one reducing agent comprises a compound selected from the group consisting of thioglycolic acid and salts and esters thereof.
17. The method of claim 11 wherein the equivalent ratio of said at least one oxidizing agent to said at least one reducing agent ranges from 1:1.5 to 1:10.
18. The method of claim 11 wherein following being wet with water, a surface of said article becomes heated to from about 30° C. to about 50° C.
19. The method of claim 11 said article further comprising a water-soluble polymer in contact with said at least one oxidizing agent, said at least one reducing agent, or both said at least one oxidizing agent and said at least one reducing agent.
20. The method of claim 19 wherein said water-soluble polymer is selected from the group consisting of polyethylene glycol, polyethylene oxide, polyvinyl alcohol, cellulose ethers, polyvinylpyrrolidone. copolymers of vinylpyrrolidone, and mixtures thereof.