Patent ID: 7806940

Claim:
A method of dyeing keratin-containing fibers comprising treating the fiber with at least one dye of formula their salts, isomers, hydrates and other solvates, wherein R 1 is 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; R 2 is hydrogen; or C 1 -C 5 alkyl; X is C 1 -C 10 alkylene, which may be substituted by one or more C 1 -C 5 alkyl, hydroxy, C 1 -C 5 -alkoxy, amino, mono-C 1 -C 5 alkylamino, di-C 1 -C 5 alkylamino, —SH, and/or interrupted by one or more —O— or —S—S—; C 5 -C 10 cycloalkylene; C 5 -C 12 arylene; C 5 -C 12 arylene-(C 1 -C 10 alkylene); biphenylene, which may be substituted by one or more C 1 -C 5 alkyl, hydroxy, C 1 -C 5 -alkoxy, amino, mono-C 1 -C 5 alkylamino, di-C 1 -C 5 alkylamino, —SH, and/or interrupted by one or more —O —, C 1 -C 4 -alkylene, —NR 3 —, —S— or —S—S—; R 3 is hydrogen; C 1 -C 12 alkyl; C 2 -C 14 alkenyl; C 6 -C 12 aryl; C 6 -C 12 alkyl; or —C 1 -C 12 alkyl-C 6 -C 12 aryl; Y is an anion; Z is 1,3-thiazolyl; 1,2-thiazolyl; 1,3-benzothiazolyl; 2,3-benzothiazolyl; imidazolyl; 1,3,4-thiadiazolyl; 1,3,5-thiadiazolyl; 1,3,4-triazolyl; pyrazolyl; benzimidazolyl; benzopyrazolyl; pyridinyl; quinolinyl; pyrimidinyl; or isoxazolyl; and n is a number from 2-100.