Process for colouring and permanent shaping keratin fibres
View Patent ↗A process for coloring and permanently shaping keratin fibers especially human hair comprising applying to the human hair: (a) an aqueous coloring composition based on at least one oxidative dye precursor and optionally at least one coupling substance but not comprising any direct dye is mixed with a composition comprising at least one oxidizing agent and applied onto hair and rinsed off from hair with water after processing 5 to 45 min at a temperature of 20 to 45° C. and towel dried, (b) placing the towel dried hair on curlers, (c) applying an aqueous composition comprising at least one reducing agent and rinsed off from hair with water after a processing time of 2 to 30 min at ambient temperature and towel dried, (d) applying a composition comprising at least one oxidizing agent and processed for 2 to 15 min and optionally rinsed off from hair with water and optionally towel dried, and (e) applying an aqueous oxidative coloring composition based on at least one oxidative dye precursor and optionally at least one coupling substance is mixed with a composition comprising at least one oxidizing agent and rinsed off from hair with water after processing 5 to 45 min at a temperature of 20 to 45° C., towel dried and dried with a dryer or left to dry in the air.
1. A process for colouring and permanently shaping keratin fibres especially human hair characterised in that it comprises the following steps
a—mixing a first aqueous oxidative colouring composition based on at least one oxidative dye precursor and optionally at least one coupling substance but not comprising any direct dye with a first composition comprising at least one oxidizing agent; applying said first oxidative colouring composition onto hair, rinsing off from hair with water after processing 5 to 45 min at a temperature of 20 to 45° C. and towel drying the hair;
b—placing the towel dried hair on curlers,
c—applying an aqueous composition comprising at least one reducing agent onto hair rinsing, off from hair with water after a processing time of 2 to 30 min at ambient temperature and towel drying the hair;
d—applying a second composition comprising at least one oxidizing agent onto hair processed for 2 to 15 min, removing curlers from hair, and optionally rinsing off from hair with water and optionally towel drying; and
e—mixing a second aqueous oxidative colouring composition based on at least one oxidative dye precursor and optionally at least one coupling substance with a third composition comprising at least one oxidizing agent; applying said second oxidative colouring composition onto hair, rinsing off from hair with water after processing 5 to 45 min at a temperature of 20 to 45° C. and drying hair.
2. The process according to claim 1 wherein the first oxidative colouring composition has pH between 5 and 12 after mixing with a first composition comprising at least one oxidizing agent.
3. The process according to claim 1 wherein the aqueous composition of step “c” comprises at least one reducing agent selected from the group consisting of thioglycolic acid; thiolactic acid and/or their salts; cystein and/or hydrochloride salt thereof; homocysteine; cysteamine; N-acetyl cysteine; thioglycerol; ethanediol monothioglycollate; 1,2-propyleneglycol monothioglycollate; 1,3-propanediol monothioglycollate or the isomer mixture resulting therefrom; 1,4-butanediol monothioglycollate and the isomer mixtures therefrom; polyethylene glycol; glycerol monothiolactate and further thio acids and the esters thereof; and mixtures thereof, and is present at a concentration of 2 to 15% by weight calculated to total composition.
4. The process according to claim 1 wherein the reducing composition has a pH between 6.5 and 10.5.
5. The process according to claim 1 wherein the second oxidizing agent comprises at least one oxidizing agent at a concentration 1 to 5% by weight, calculated to total composition.
6. The process according to claim 5 wherein the pH of the second oxidizing agent is between 2 and 6.
7. The process according to claim 1 wherein the second oxidative colouring composition comprises at least one direct dye.
8. The process according to claim 1 wherein any of the compositions used in any step of the process further comprises a thickening agent selected from anionic, non-ionic and cationic polymers.
9. The process according to claim 1 wherein any of the compositions used in any step of the process is an emulsion and comprises at least fatty alcohol with an alkyl chain length of 12 to 22 C atoms.
10. The process according to claim 1 wherein any of the compositions used in any step of the process further comprises a surfactant selected from anionic, cationic, non-ionic and amphoteric surfactants.
11. The process according to claim 10 wherein the surfactant is a cationic surfactant according to formula
where R 1 is a saturated or unsaturated, branched or non-branched alkyl chain with 8-22 C atoms or
R 5 CONH(CH 2 ) n
where R 5 is saturated or unsaturated, branched or non-branched alkyl chain with 7-21 C atoms and n has typical value of 0-4 or
R 6 COO(CH 2 ) n
where R 6 is saturated or unsaturated, branched or non-branched alkyl chain with 7-21 C atoms and n has typical value of 0-4, and
R 2 is a hydrogen, saturated or unsaturated, branched or non-branched alkyl chain with 1-22 C atoms or
R 5 CONH(CH 2 ) n
where R 5 is saturated or unsaturated, branched or non-branched alkyl chain with 7-21 C atoms and n has typical value of 0-4 or
R 6 COO(CH 2 ) n
where R 6 is saturated or unsaturated, branched or non-branched alkyl chain with 7-21 C atoms and n has typical value of 0-4,
and R 3 and R 4 are independent from each other H or lower alkyl chain with 1 to 4 carbon atoms, and X is chloride, bromide or methosulfate.
12. The process according to claim 1 wherein any of the compositions used in any step of the process further comprises at least one organic solvent at a concentration of 0.1 to 10% by weight, calculated to total composition individually.
13. The process according to claim 1 wherein the first and third oxidative colouring compositions used comprise at least one fatty acid with 12 to 22 C atoms which can be saturated or unsaturated.
14. The process according to claim 1 wherein any of the compositions used in any step of the process comprises at least one ubichinone of the formula
where n is a number between 1 and 10.
15. The process according to claim 1 wherein any of the compositions used in any step of the process further comprises at least one silicone compound.
16. The process according to claim 1 wherein any of the compositions used in any step of the process further comprises—at least one cationic polymer.