Patent ID: 7811335

Claim:
A 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′ 1 , R 2 , R′ 2 , R 3 and 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; halogen; NO 2 ; OH; 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; or a radical of formula —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 —(CO)—H; —(CO)—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; W 1 , W′ 1 , W 2 , W′ 2 , W 3 , W′ 3 , W 4 or W′ 4 , independently from each other are —CH— or —N + —; wherein only one of W 1 /W′ 1 , W 2 /W′ 2 , W 3 /W′ 3 , W 4 /W 4 ′ is —N + ; and the bivalent radical -Q-Z—Y—S—S—Y′—Z′-Q′- is bonded to W 1 or W 2 and W′ 1 or W′ 2 respectively; Y 1 and Y 2 independently from each other are C 1 -C 10 alkylene; C 5 -C 10 cycloalkylene; C 5 -C 12 arylene; or C 5 -C 12 arylene-(C 1 -C 10 alkylene); Q and Q′ independently from each other are a direct bond; —C(O)—; —C(O)O—; —OCO—; —N(R 6 )—; —C(O)N(R 6 )—; —(R 6 )NC(O)—; —O—; —S—; —S(O)—; or —S(O) 2 —; and R 6 and R 7 independently from each other are hydrogen; C 1 -C 14 alkyl; C 2 -C 14 alkenyl; C 6 -C 12 aryl; C 6 -C 12 aryl-C 1 -C 10 alkyl; or C 1 -C 10 alkyl(C 5 -C 12 aryl).