Patent ID: 7686850

Claim:
Method of dyeing keratin-containing fibers comprising treating the fiber with at least one sulfide dye of formula (1) their salts, isomers, hydrates and other solvates, wherein R 1 , R 2 , R 3 , independently from each other are hydrogen; C 1 -C 20 alkyl or C 1 -C 20 alkoxy, which may be substituted by one or more C 1 -C 5 alkoxy, halogen, —NH 2 , mono-C 1 -C 5 alkylamino, di-C 1 -C 5 alkylamino, —NO 2 or hydroxy; C 3 -C 6 cycloalkyl; —C(O)H; —C(O)—C 1 -C 5 alkyl; —C(O)OH; —C(O)O—C 1 -C 5 alkyl; halogen; NO 2 ; OH; SH; phenyl, which may be substituted by one or more C 1 -C 5 alkyl, C 1 -C 5 alkoxy, halogen, —NH 2 , mono-C 1 -C 5 alkylamino, di-C 1 -C 5 alkylamino, —NO 2 or hydroxy; —NH(CO)—CH 3 ; or a radical of formula (1a) —NR 4 R 5 , wherein R 4 and R 5 independently from each other are hydrogen; C 1 -C 12 alkyl, which may be substituted by one or more C 1 -C 5 alkyl, C 1 -C 5 -alkoxy, hydroxy or —(O)—H; —(CO)H; —(CO)—C 1 -C 5 alkyl; —C(O)OH; —C(O)O—C 1 -C 5 alkyl; phenyl or phenyl-C 1 -C 4 alkyl, wherein the phenyl moiety may be substituted by one or more C 1 -C 5 alkyl, C 1 -C 5 alkoxy, halogen, —NH 2 , mono-C 1 -C 5 alkylamino, di-C 1 -C 5 alkylamino, —NO 2 , carboxy or hydroxy; or a radical of formula wherein at least one of the radicals R 1 , R 2 or R 3 is NO 2 ; Y 1 is C 1 -C 10 alkylene; C 5 -C 10 cycloalkylene; C 5 -C 10 arylene; or C 5 -C 10 arylene-(C 1 -C 10 alkylene); Z 1 is a direct bond; or a cationic biradical of a saturated, aromatic or heteroaromatic group; Q 1 is —C(O)—; —C(O)O—; —OCO—; —N(R 6 )—X 2 —; —CON(R 6 )—; —(R 6 )NC(O)—; —O—; —S—; —S(O)—; or —S(O) 2 —; X 1 and X 2 independently from each other are a direct bond; C 1 -C 10 alkylene; C 5 -C 10 cycloalkylene; C 5 -C 10 arylene; or C 5 -C 10 arylene-(C 1 -C 10 alkylene); and R 6 , R 7 and R 8 independently from each other are hydrogen; C 1 -C 14 alkyl; C 2 -C 14 alkenyl; C 6 -C 10 aryl; C 6 -C 10 aryl-C 1 -C 10 alkyl; or C 1 -C 10 alkyl(C 5 -C 10 aryl); m is 1 or 2; and U is hydrogen if m is 1; or is a direct bond if m is 2; with the proviso that the method does not comprise contacting hair with an enzyme of the type of a protein disulfidisomerase (EC 5.3.4.1).