Coupling components
View Patent ↗Keratin fibers are colored by an agent comprising a coupler which is a m-phenylenediamine derivative of the formula (I) wherein R 1 is a C 1 –C 4 alkyl group or a C 1 –C 4 monohydroxyalkyl group; R 2 is a methyl or an ethyl group; each of R 3 and R 4 is independently a branched or unbranched C 2 –C 6 hydroxyalkyl group; and a cosmetically acceptable carrier. These couplers exhibit improved toxicological and dermatological properties and permit hair colorations in a broad color spectrum with good fastness properties.
1. A composition comprising 2,4-Bis[(2-hydroxyethyl)amino]-6-methylanisole in a weakly alkaline medium.
2. A composition comprising 2,4-bis[(3-hydroxypropyl)amino]-6-methylanisole in a weakly alkaline medium.
3. The composition of claim 1 further comprising p-tolylenediamine.
4. The composition of claim 1 further comprising 1-(2-hydroxyethyl)-2,5-diaminobenzene.
5. The composition of claim 1 further comprising bis (2-hydroxy-5-aminophenol)methane.
6. The composition of claim 1 further comprising 2,4,5,6-tetraaminopyrimidine.
7. The composition of claim 1 , further including a direct dye.
8. The composition of claim 7 , wherein the direct dye is a cationic direct dye.
9. The composition of claim 2 , further including a direct dye.
10. The composition of claim 9 , wherein the direct dye is a cationic direct dye.
11. An agent for coloring keratin fibers, in particular, human hair, comprising, in a cosmetic acceptable carrier, as coupler component, at least one m-phenylenediamine derivative selected from the group consisting of 2,4-bis[(2-hydroxyethyl)amino]-6-methylanisole and 2,4-bis[(3-hydroxypropyl)amino]-6-methyl anisole and having a pH of 9–12.
12. The agent of claim 11 , wherein the coupler component is 2,4-bis[(2-hydroxyethyl)amino]-6-methylanisole.
13. The agent as claimed in claim 12 , further comprising p-tolylenediamine.
14. The agent as claimed in claim 12 , further comprising 1-(2-hydroxyethyl)-2,5-diaminobenzene.
15. The agent as claimed in claim 12 , further comprising bis(2-hydroxy-5-aminophenol)methane.
16. The agent as claimed in claim 12 , further comprising 2,4,5,6-tetraaminopyrimidine.
17. The agent as claimed in claim 11 , further including a direct dye.
18. The agent as claimed in claim 17 , wherein the direct dye is a cationic direct dye.
19. A method of coloring keratin fibers in which an agent as claimed in claim 11 is applied to the fibers and is rinsed off again after a contact time.
20. A method of coloring keratin fibers in which an agent as claimed in claim 17 is applied to the fibers and is rinsed off again after a contact time.