# US 5,350,424 A · Dyestuff composition for the gradual dyeing of hair by atmospheric oxidation and process using the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,350,424 A - Document ID: US5350424A - Status: Granted - Kind: A - Application number: 07/959,343 - Filed: 1992-10-13 - Granted: 1994-09-27 - Earliest claimed: 1992-10-13 - Assignees: Combe Incorporated - Inventors: Albert Shansky - Web page: https://patentgrep.com/patent/US5350424A ## CPC - A61K 8/411: {Aromatic amines, i.e. where the amino group is directly linked to the aromatic nucleus} - A61K 8/042: {Gels} - A61Q 5/10: Preparations for permanently dyeing the hair - A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D) - A61Q: SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS ## Abstract A dyestuff composition for gradually dyeing hair by atmospheric oxidation wherein the dyestuff composition contains a dye component which becomes entrapped in hair fibers when the dyestuff composition is removed from the hair and which results in the gradual development of color in the hair due to atmospheric oxidation of the entrapped dye component. Also provided is a process of employing the dyestuff composition of this invention to gradually dye hair, the dyestuff composition being removed from the hair approximately 5 minutes after its application. ## Claims ### Claim 1 A process for gradually dyeing hair by atmospheric oxidation with an adherent gel dyestuff composition having an aqueous carrier and an air-oxidizable dye component, wherein said air-oxidizable dye component is an oxidizable primary aromatic amine or an aminophenol, and said adherent gel dyestuff composition is substantially free of surfactants and wetting agents, comprising the steps of: (a) applying said adherent gel dyestuff composition to the surface of the hair, said dyestuff composition (i) having a pH of at least about 9 to penetrate hair fibers and (ii) containing a sufficient amount of said air-oxidizable dye component to allow said dye component to be deposited in said hair fibers; (b) rinsing the hair to fix the deposited dye component in the hair fibers; and (c) removing any remaining dyestuff composition from the surface of the hair, whereby gradual development of color in the hair occurs subsequent to said rinsing due to atmospheric oxidation of said deposited fixed dye component over a period of approximately 24 to 72 hours and being substantially free of chemical oxidants. ### Claim 2 (depends on 1) The process according to claim 1, wherein said rinsing step is performed no longer than about 5 minutes after the application of said dyestuff composition to the hair. ### Claim 3 (depends on 1) The process according to claim 1, wherein said air-oxidizable dye component includes a color coupler selected from the group consisting of m-diamines, m-amino phenols, mono- and poly-hydric phenols and naphthols. ### Claim 4 (depends on 1) The process according to claim 1, wherein said air oxidizable dye component is present in amounts from 0.5 to 3.5% by weight of the total composition. ### Claim 5 (depends on 1) The process according to claim 1, wherein the pH is from about 9.5 to 10.5. ### Claim 6 (depends on 1) The process according to claim 1, wherein said dyestuff composition includes at least one alkaline agent selected from the group consisting of ammonia, alkanolamines, water soluble alicyclic amines, alkali metal salts, alkali metal sulfites, alkali metal phosphates and alkali metal carbonates. ### Claim 7 (depends on 1) The process according to claim 1, wherein said air-oxidizable dye component contains an effective amount of (i) at least one primary intermediate selected from the group consisting of p-phenylenediamine, 2,4-diaminophenetol sulfate and N-phenyl-p-phenylenediamine, and (ii) at least one color coupler selected from the group consisting 4-chloro resorcinol, resorcinol, and m-aminophenol, to cause an ostensible color in the hair after said atmospheric oxidation. ### Claim 8 (depends on 7) The process according to claim 7, wherein said air-oxidizable dyestuff composition contains an effective amount of monoethanolamine to cause said dye component to penetrate the hair fibers. ### Claim 9 (depends on 1) The process for gradually reaching a desired target color by repeating the process of claim 1 until the desired target color is obtained. ### Claim 10 (depends on 1) The process according to claim 1, wherein the remaining air-oxidizable dye component is removed from the surface of said hair fibers by shampooing. ### Claim 11 A process for gradually dyeing hair by atmospheric oxidation with an adherent gel dyestuff composition having a carrier, a thickening agent and an air-oxidizable dye component, wherein said adherent gel dyestuff composition is substantially free of surfactants and wetting agents, comprising the steps of: (a) applying said adherent gel dyestuff composition containing (i) a primary aromatic amine or aminophenol dye component present in amounts from 0.5 to 3.5% by weight of the total composition to the surface of the hair, said dyestuff composition having a pH from about 9 to 11 to allow said dye component to penetrate hair fibers and to be deposited in said hair fibers and (iii) said thickening agent in amounts sufficient to make said dye component adhere to said hair fibers; (b) rinsing the hair to fix the deposited dye component in the hair fibers; and (c) removing any remaining dyestuff composition from the surface of the hair, whereby gradual development of color in the hair occurs subsequent to said rinsing due to atmospheric oxidation of said deposited fixed dye component over a period of approximately 24 to 72 hours and being substantially free of chemical oxidants. ### Claim 12 (depends on 1) The process according to claim 1, wherein said air-oxidizable dye component is present in amounts from about 1.0 to 3.5% by weight of the total composition and wherein said air-oxidizable dye component is (a) selected from the group consisting of oxidizable primary aromatic amines, aminophenols and mixtures thereof and (b) optionally includes at least one color coupler. ### Claim 13 (depends on 11) The process according to claim 11, wherein said air-oxidizable dye component is present in amounts from about 1.0 to 3.5% by weight of the total composition and wherein said air-oxidizable dye component is (a) selected from the group consisting of oxidizable primary aromatic amines, aminophenols and mixtures thereof and (b) optionally includes at least one color coupler.