Composition for coloring of keratin fibers
View Patent ↗The present invention concerns a composition for the dyeing keratin fibers especially human hair on the basis of an oxidation dyestuff precursor system reacting with peroxide and comprising additionally anionic direct dyes which provides long-lasting, intensive, vibrant colors. Hair dyeing composition of the present invention comprises at least one oxidation dyestuff precursor reacting with peroxide, optionally at least one coupling agent and at least one acidic direct dye. The compositions of the present invention do not comprise any cationic dyes.
1. A process for colouring hair comprising the steps of:
providing a first composition comprising at least one oxidation dye precursor and at least one acidic direct dye selected from Acid Red 52, Acid Violet 2, Acid Orange 4, Acid Red 27 and Acid Yellow 10, with the condition that it does not comprise cationic direct dye,
mixing the first composition with a second composition comprising a hydrogen peroxide to form a third composition, wherein the third composition has a pH between 6.8 and 12, and
applying the third composition onto hair for a period between 15 and 45 minutes at ambient temperature and/or at a temperature between 30 and 45° C.
2. The process according to claim 1 wherein the oxidative dye precursor of the first composition is selected from 2,4,5,6-tetraaminopyrimidine, 4-aminophenol, 4-amino-3-methylphenol, 2,5-daimio-toluene and 2-(2,5-diaminophenyl) ethanol.
3. The process according to claim 1 wherein the first composition comprises additionally at least one coupling agent.
4. The process according to claim 1 wherein the first composition comprises additionally at least one coupling agent selected from 2,6-dihydroxyethylamino toluene, 2-methyl resorcinol, 4-amino-2-methylphenol and α-naphtol.
5. The process according to claim 1 wherein the first composition comprises oxidative dye precursor at a concentration of 0.01 to 5% by weight calculated to total composition, excluding oxidizing agent.
6. The process according to claim 1 wherein the first composition comprises anionic direct dye at a concentration of 0.01 to 7.5% by weight calculated to total composition excluding oxidizing agent.
7. The process according to claim 1 wherein the first composition comprises organosiloxane polymer according to formula
wherein m and n each are numbers from 20 to 10,000, x is a number between 1 and 5, and y is a number from 5 to 30, R 15 is a C 1 -C 12 -alkyl or aryl group- and Y − is an anion.
8. The process according to claim 1 wherein the first composition comprises additionally at least one ceramide type compound according to the formula
where R 18 and R 19 are independent from each other alkyl- or. alkenyl group mit 10 to 22 carbon atoms, R 20 is methyl, ethyl, n-propyl or isopropyl group and n is a number between 1 to 6.
9. The process according to claim 1 wherein the first composition comprises at least one ubiquinone of the formula
wherein n is a number from 1 to 10.
10. The process according to claim 1 wherein the first composition comprises additionally neutral direct dyes.
11. The process according to claim 1 wherein the first composition comprises additionally potassium or sodium iodide and/or dihydroxyacetone as catalysts.
12. The process according to claim 7 , wherein R 15 is a methyl, ethyl or benzyl group.