Double secondary para-phenylenediamine compounds, dye compositions comprising same, and dyeing process using the compositions

1. A dye composition comprising, in a medium that is suitable for dyeing keratin fibers, at least one compound chosen from those of formula (I′) and the addition salts thereof:

wherein:

R, which may be identical or different, is chosen from C 1 -C 2 alkyl radicals; and C 1 -C 2 alkoxy radicals;

m, which may be identical or different, is an integer ranging from 0 to 4;

n is an integer ranging from 1 to 3.

2. The dye composition according to claim 1 , wherein the keratin fibers are human keratin fibers.

3. The dye composition according to claim 1 , wherein when n is equal to 1, m does not equal 0.

4. The dye composition according to claim 1 , wherein m is equal to 0 or 1.

5. The dye composition according to claim 4 , wherein m is equal to 0.

6. The dye composition according to claim 1 , where n is equal to 2.

7. The dye composition according to claim 1 , where the at least one compound of formula (I′) is present in an amount ranging from 0.001% to 10% by weight, relative to the total weight of the dye composition.

8. The dye composition according to claim 7 , where the at least one compound of formula (I′) is present in an amount ranging from 0.005% to 6% by weight, relative to the weight of the dye composition.

9. The dye composition according to claim 1 , further comprising at least one additional oxidation base other than the at least one compound of formula (I′), optionally combined with at least one coupler.

10. The dye composition according to claim 9 , where the at least one additional oxidation base is chosen from para-phenylenediamines, bis(phenyl)alkylenediamines other than the compound of formula (I′), para-aminophenols, ortho-aminophenols, heterocyclic bases, and the addition salts thereof.

11. The dye composition according to claim 9 , where the at least one additional oxidation base is present in an individual amount ranging from 0.001% to 10% by weight, relative to the total weight of the dye composition.

12. The dye composition according to claim 9 , where the at least one coupler is chosen from meta-phenylenediamines, meta-aminophenols, meta-diphenols, naphthalene-based couplers, heterocyclic couplers, and the addition salts thereof.

13. The dye composition according to claim 12 , where the at least one coupler is present in an individual amount ranging from 0.001% to 10% by weight, relative to the total weight of the dye composition.

14. The dye composition according to claim 1 , further comprising at least one direct dye chosen from neutral, anionic and cationic direct dyes.

15. The dye composition according to claim 14 , where the at least one direct dye is chosen from nitrobenzene dyes, azo dyes, azomethine dyes, azine dyes, methine dyes, tetraazapentamethine dyes, quinone dyes, anthraquinone dyes, naphthoquinone dyes, benzoquinone dyes, phenothiazine dyes, indigoid dyes, indoamine dyes, xanthene dyes, phenanthridine dyes, phthalocyanin dyes, triarylmethane-based dyes and natural dyes.

16. The dye composition according to claim 14 , where the at least one direct dye is present in an amount ranging from 0.001% to 20% by weight, relative to the total weight of the dye composition.

17. The dye composition according to claim 16 , where the at least one direct dye is present in an amount ranging from 0.01% to 10% by weight, relative to the weight of the dye composition.

18. The dye composition according to claim 1 , further comprising at least one oxidizing agent.

19. The dye composition according to claim 18 , where the at least one oxidizing agent is chosen from hydrogen peroxide, urea peroxide, alkali metal bromates, persalts, and enzymes.

20. The dye composition according to claim 18 , where the persalts are chosen from perborates and persulfates.

21. The dye composition according to claim 18 , where the enzymes are chosen from peroxidases and two- or four-electron oxidoreductases.

22. The dye composition according to claim 18 , where the at least one oxidizing agent is hydrogen peroxide.

23. A process for the oxidation dyeing of keratin fibers, comprising

applying to the wet or dry fibers a dye composition, wherein the dye composition comprises, in a medium that is suitable for dyeing keratin fibers, at least one compound chosen from those of formula (I′) and the addition salts thereof:

wherein:

R, which may be identical or different, is chosen from C 1 -C 2 alkyl radicals; and C 1 -C 2 alkoxy radicals;

m, which may be identical or different, is an integer ranging from 0 to 4;

n is an integer ranging from 1 to 3; and leaving the composition on the keratin fibers for a time that is sufficient to obtain the desired coloration.

24. The process according to claim 23 , where the keratin fibers are human keratin fibers.

25. The process according to claim 23 , where the composition, at the time it is applied to the fibers, further comprises at least one oxidizing agent.

26. The process according to claim 25 , where the at least one oxidizing agent is in a composition separate from the dye composition prior to the process being performed.

27. A multi-compartment kit for dyeing keratin fibers comprising

a first compartment comprising a dye composition comprising, in a medium that is suitable for dyeing keratin fibers, at least one compound chosen from those of formula (I′) and the addition salts thereof:

wherein:

R, which may be identical or different, is chosen from C 1 -C 2 alkyl radicals; and C 1 -C 2 alkoxy radicals;

m, which may be identical or different, is an integer ranging from 0 to 4;

n is an integer ranging from 1 to 3; and

a second compartment comprising at least one oxidizing agent.