Keratin dyeing compositions comprising a radical scavenger and use thereof

1. A composition for the oxidative dyeing of keratin fibers comprising:

a. at least one radical scavenger selected from pyrazolone compounds according to formula (I):

wherein R 1 comprises hydrogen, substituted or unsubstituted alkyl or heteroalkyl, substituted or unsubstituted cycloalkyl or heterocycloalkyl, substituted or unsubstituted alkenyl or heteroalkenyl, substituted or unsubstituted alkynyl or heteroalkynyl, substituted or unsubstituted cycloalkenyl or heterocycloalkenyl, substituted or unsubstituted cycloalkynyl or heterocycloalkynyl, substituted or unsubstituted aryl or heteroaryl, substituted or unsubstituted alkaryl or heteroalkaryl, or substituted or unsubstituted arylkyl or heteroarylkyl; and

wherein R 2 comprises —OCH 3 , —CO 2 H, —C≡CCO 2 H, —CH═CHCO 2 H, or —C≡CH;

b. at least one coupler compound; and

c. at least one developer compound.

2. The composition of claim 1 , wherein R 2 is —CO 2 H.

3. The composition of claim 2 , wherein R 1 comprises hydrogen or substituted or unsubstituted aryl or heteroaryl.

4. The composition of claim 1 , wherein said radical scavenger comprises 3-carboxy-1H-pyrazol-5-one, 1-(2-sulfophenyl)-3-carboxy-1H-pyrazol-5-one, 4-(3-carboxy-1H-pyrazol-5-one-1-yl) benzenesulfonate monosodium salt, 3-carboxy-1-phenylpyrazol-5-one, 1-(4-sulfophenyl)-3-carboxy-1H-pyrazol-5-one, 1-(3-sulfophenyl)-3-carboxy-1H-pyrazol-5-one, 3-carboxy-1-(pyridine-4-yl)pyrazol-5-one, 3-carboxy-1-(4-phosphonophenyl)-pyrazol-5-one, 1-(3-carboxy-4-sulfophenyl)-3-carboxypyrazol-5-one, 3-carboxy-1-(3-sulfopropyl)-pyrazol-5-one, 3-carboxy-1-(2-hydroxyethyl)pyrazol-5-one, 3-carboxy-1-methylpyrazol-5-one, 3-carboxy-1-cyclohexylpyrazol-5-one, 3-carboxy-1-(4-(3-sulfopropyl)phenyl)-pyrazol-5-one, 3-carboxy-1-(5-carboxythiophen-2-yl)pyrazol-5-one, 1-benzyl-3-carboxypyrazol-5-one, 3-carboxy-1-(4-n-propylphenyl)-pyrazol-5-one, 3-carboxy-1-(thiazol-2-yl)pyrazol-5-one, 3-(1-(4-sulfophenyl)pyrazol-5-on-3-yl)propiolic acid, 3-(1H-pyrazol-5-on-3-yl)acrylic acid, 1-(4-carboxyphenyl)-3-ethynylpyrazol-5-one, 3-carboxy-1-(2-chloro-5-sulfophenyl)-pyrazol-5-one, 3-carboxy-1-(2,5-dichloro-4-sulfophenyl)-pyrazol-5-one, 3-carboxy-1-(3,5-disulfophenyl)-pyrazol-5-one, 1-(4-carboxyphenyl)-3-carboxy-1H-pyrazol-5-one, or mixtures thereof.

5. A composition according to claim 1 , wherein said composition further comprises a chelant.

6. A composition according to claim 5 wherein said chelant comprises a carboxylic acid chelant, a phosphonic acid chelant, a polyphosphoric acid chelant, salts thereof, derivatives thereof, or mixtures thereof.

7. A composition according to claim 6 wherein said chelant comprises diethylenetriamine pentaacetic acid (DTPA), ethylenediamine-N,N′-disuccinic acid (EDDS), ethylenediamine-N,N′-diglutaric acid (EDDG), 2-hydroxypropylenediamine-N,N′-disuccinic acid (HPDDS), glycinamide-N,N′-disuccinic acid (GADS), ethylenediamine-N-N′-bis(ortho-hydroxyphenyl acetic acid) (EDDHA), diethylene-triamine-penta-(methylenephosphonic acid) (DTPMP), salts thereof, derivatives thereof, or mixtures thereof.

8. A composition according to claim 7 wherein said composition comprises diethylene-triamine-penta-(methylenephosphonic acid) and ethylenediamine-N,N′-disuccinic acid.

9. A composition according to claim 5 wherein said composition comprises from about 0.25% to about 3.0% of said chelant.

10. A composition according to claim 9 wherein said composition comprises from about 0.5% to about 1.0% of said chelant.

11. A composition according to claim 1 , wherein said developer compound comprises methoxymethyl-p-phenylenediamine, 2,6-dichloro-4-aminophenol, 5-amino-2-ethyl-phenol, 2,5-toluenediamine sulphate, N-phenyl-p-phenylenediamine, p-phenylenediamine, p-methylaminophenol, N,N-bis(2-hydroxyethyl)-p-phenylenediamine, 3-methyl-p-aminophenol, hydroxyethyl-p-phenylenediamine, hydroxypropyl-bis-(N-hydroxyethyl)-p-phenylenediamine, 1-hydroxyethyl-4.5-diaminopyrazole, 2,2′-methylenebis-4-aminophenol, 5-methyl-o-aminophenol, 5-ethyl-o-aminophenol, or mixtures thereof.

12. A composition according to claim 1 wherein said coupler compound comprises a phenol, a resorcinol, a naphthol, a m-aminophenol, a m-phenylenediamine, a heterocyclic compound, or mixtures thereof.

13. A composition according to claim 12 wherein said coupler compound comprises 2-amino-5-ethyl-phenol; naphthalene-1,7-diol; benzene-1,3-diol; 4-chlorobenzene-1,3-diol; naphthalen-1-ol; 2-methyl-naphthalen-1-ol; naphthalene-1,5-diol; naphthalene-2,7-diol; 2-methyl-benzene-1,3-diol; 1-acetoxy-2-methylnaphthalene; benzene-1,3-diamine; 2-(2,4-diamino-phenoxy)-ethanol; 4-{3-[(2,4-diaminophenyl)oxy]propoxy}benzene-1,3-diamine; 2-[2,4-diamino-5-(2-hydroxy-ethoxy)-phenoxy]-ethanol; 3-(2,4-diamino-phenoxy)-prop an-1-ol; 2,4-diamino-5-(2′-hydroxyethyloxy)toluene; 1-methyl-2,6-bis(2-hydroxyethylamino)benzene; 3-amino-phenol; 5-amino-2-methyl-phenol; 3-amino-2,6-dimethylphenol; 3-amino-2-methyl-phenol; 1-methyl-2-hydroxy-4-(2′-hydroxyethyl)aminobenzene; 1-hydroxy-3-amino-2,4-dichlorobenzene; 1,3-Bis-(2,4-diaminophenoxy)propane; 1-hydroxy-2-methyl-5-amino-6-chlorobenzene; 5-amino-4-chloro-2-methylphenol; 3,4-dihydro-2H-1,4-benzoxazin-6-ol; 1,3-benzodioxol-5-ol; 1,3-benzodioxol-5-amine; 1H-indol-4-ol; 1H-indole-5,6-diol; 1H-indol-7-ol; 1H-indol-5-ol; 1H-indol-6-ol; pyridine-2,6-diamine; 2-aminopyridin-3-ol; 4-hydroxy-N-methylindole; 2,6-dihydroxypyridine; 2,6-dihydroxy-3,4-dimethylpyridine; 6-hydroxybenzomorpholine; 2,6-dihydroxy-3,4-dimethylpyridine; 3,5-diamino-2,6-dimethoxypyridine; 3-Amino-2-methylamino-6-methoxypyridine; or mixtures thereof.

14. A composition according to claim 1 , wherein said composition further comprises an oxidizing agent, a source of carbonate ion, an alkalizing agent, or a mixture thereof.

15. A method of treating hair comprising the steps of contacting the hair with a composition according to claim 1 and subsequently rinsing said composition from the hair.

16. The method of claim 15 , wherein said composition is applied as a pre-treatment.

17. A hair colouring kit comprising:

a. an individually packaged first component comprising an oxidizing agent and

b. an individually packaged second component comprising:

i. at least one radical scavenger selected from pyrazolone compounds according to formula (I):

wherein R 1 comprises hydrogen, substituted or unsubstituted alkyl or heteroalkyl, substituted or unsubstituted cycloalkyl or heterocycloalkyl, substituted or unsubstituted alkenyl or heteroalkenyl, substituted or unsubstituted alkynyl or heteroalkynyl, substituted or unsubstituted cycloalkenyl or heterocycloalkenyl, substituted or unsubstituted cycloalkynyl or heterocycloalkynyl, substituted or unsubstituted aryl or heteroaryl, substituted or unsubstituted alkaryl or heteroalkaryl, or substituted or unsubstituted arylkyl or heteroarylkyl; and wherein R 2 comprises —OCH 3 , —CO 2 H, —C≡CCO 2 H, —CH═CHCO 2 H, or —C≡CH;

ii. at least one developer compound; and

iii. at least one coupler compound.