# US 7,744,655 B2 · Process for dyeing the hair using an anionic coloured polymer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,744,655 B2 - Document ID: US7744655B2 - Status: Granted - Kind: B2 - Application number: 11/795,383 - Filed: 2006-03-14 - Published: 2008-11-20 - Granted: 2010-06-29 - Earliest claimed: 2005-03-14 - Assignees: L'oreal - Inventors: Maxime De Boni; Bruno Laguitton - Web page: https://patentgrep.com/patent/US7744655B2 ## CPC - A61K 8/88: Polyamides - A61K 8/817: {Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Compositions or derivatives of such polymers, e.g. vinylimidazol, vinylcaprolactame, allylamines (Polyquaternium 6)} - A61K 8/84: obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds - A61Q 5/065: {Preparations for temporary colouring the hair, e.g. direct dyes} - A61Q 5/10: Preparations for permanently dyeing the hair - A61K 2800/5424: anionic - A61K 2800/5426: cationic - A61K 2800/57: Compounds covalently linked to a(n inert) carrier molecule, e.g. conjugates, pro-fragrances - A61K 2800/594: Mixtures of polymers - 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 The present invention relates to a process for dyeing keratin fibres, which comprises the application to the fibres of a composition containing at least one cationic polymer, rinsing of the keratin fibres, the application of a composition containing at least one anionic colored polymer, and rinsing of the keratin fibres. Such a process makes it possible to obtain an improvement in the coloration of the keratin fibres. ## Claims ### Claim 1 A process for dyeing keratin fibers comprising: applying to the fibers a cosmetic composition comprising at least one cationic polymer; rinsing the keratin fibers; applying to the fibers a cosmetic composition comprising at least one anionic colored polymer is chosen from: wherein n is an integer ranging from 1 to 500; and the sum of n’, l, and p is 1; and rinsing the keratin fibers, thereby providing temporary coloration to said keratin fibers. ### Claim 2 (depends on 1) A process according to claim 1, wherein the at least one cationic polymer is polylysine. ### Claim 3 (depends on 1) A process according to claim 1, wherein the at least one cationic polymer is chosen from polymers comprising a quaternary ammonium group. ### Claim 4 (depends on 1) A process according to claim 1, wherein the at least one cationic polymer has the formula W: ### Claim 5 (depends on 1) A process according to claim 1, wherein the at least one cationic polymer is present in an aqueous composition in an amount ranging from 0.01% to 20% by weight, relative to the total weight of the composition. ### Claim 6 (depends on 1) A process according to claim 1, wherein the at least one anionic colored polymer is present in an aqueous composition in an amount ranging from 0.01% to 20%. ### Claim 7 (depends on 1) A process according to claim 1, wherein the at least one anionic colored polymer is present in an aqueous composition in an amount ranging from 0.1% to 5%. ### Claim 8 (depends on 1) A process according to claim 1, wherein the cosmetic composition comprising the at least one cationic polymer and/or the cosmetic composition comprising the at least one anionic colored polymer further comprises at least one salt chosen from organic salts and mineral salts. ### Claim 9 (depends on 8) A process according to claim 8, wherein the at least one salt is chosen from sodium citrate, sodium chloride, ammonium sulfate, magnesium chloride and calcium chloride. ### Claim 10 (depends on 8) A process according to claim 8, wherein the at least one salt is present in an amount ranging from 10−4 to 2 mol/l. ### Claim 11 (depends on 8) A process according to claim 8, wherein the at least one salt is present in an amount ranging from 10−2 to 1 mol/l. ### Claim 12 (depends on 1) A process according to claim 1, wherein the keratin fibers are dark hair. ### Claim 13 (depends on 1) A process according to claim 1, wherein the cosmetic composition comprising the at least one cationic polymer and/or the cosmetic composition comprising the at least one anionic colored polymer further comprises at least one additive chosen from anionic, cationic, nonionic, amphoteric surfactants, zwitterionic surfactants; anionic polymers, cationic polymers, nonionic polymers, amphoteric polymers zwitterionic polymers; mineral thickeners, organic thickeners; antioxidants; penetrants; sequestrants; fragrances; buffers; dispersants; conditioning agents; film-forming agents; ceramides; preserving agents; opacifiers; and solvents. ### Claim 14 (depends on 13) A process according to claim 13, wherein the additives present in the cosmetic composition comprising the at least one cationic polymer and/or the cosmetic composition comprising the at least one anionic colored polymer do not bear charges opposite to the charge of the polymer. ### Claim 15 A kit for temporarily dyeing keratin fibers comprising a first compartment comprising a cosmetic composition wherein the cosmetic composition in said first compartment comprises at least one cationic polymer having the formula W: wherein said cationic polymer is present in an aqueous composition in an amount ranging from 0.01% to 20% by weight, relative to the total weight of the composition; and a second compartment comprising a cosmetic composition wherein the cosmetic composition in said second compartment comprises at least one anionic colored polymer, wherein said anionic polymer comprises an anionic chromophore substituted with at least one group chosen from sulfonate, carboxylate, phosphate, phosphonate and sulfate, and is present in an aqueous composition in an amount ranging from 0.01% to 20% by weight, relative to the total weight of the composition wherein the at least one anionic colored polymer is chosen from: wherein n is an integer ranging from 1 to 500; and the sum of n’, l, and p is 1. ### Claim 16 (depends on 15) A kit according to claim 15, wherein the first compartment contains at least one salt chosen from organic salt and mineral salt. ### Claim 17 (depends on 15) A kit according to claims 15, wherein the at least one cationic polymer and the at least one anionic colored polymer are aqueous.