Patent ID: 7488353

Claim:
A cationic heteroarylazine dye selected from the group consisting of: 1-(2-hydroxyethyl)-3-{(Z)-[(2E)-2-(3-methyl-1,3-benzothiazol-2(3H)-ylidene)hydrazono]methyl}pyridinium bromide, 4-{(E)-[(2Z))-2-(3,4-dimethyl-1,3-thiazol-2(3H)-ylidene)hydrazono]methyl}-1-(2-hydroxyethyl)pyridinium bromide, 2-{(E)-[(2Z)-2-(3,4-dimethyl-1,3-thiazol-2(3H)-ylidene)hydrazono]methyl-3-(methyl)-1-methyl-1H-imidazol-3-ium methylsulfate, 3-(2-hydroxyethyl)-1-methyl-2-{(Z)-[(2E)-2-(3-methyl-1,3-benzothiazol-2(3H)-ylidene)hydrazono]methyl}-1H-imidazol-3-ium bromide, 1-(2-hydroxyethyl)-4-{(Z)-[(2E)-2-(3-methyl-1,3-benzothiazol-2(3H)-ylidene)hydrazono]methyl}pyridinium bromide, 4-[(E)-({bis[4-(dimethylamino)phenyl]methylene}hydrazono)methyl]-1-(2-hydroxyethyl)pyridinium bromide, 4-[(E)-({bis[4-dimethylamino)phenyl]methylene}hydrazono)methyl]-1-(2-hydroxyethyl)quinolinium bromide, 4-[(E)-({bis[4-(dimethylamino)phenyl]-methylene}hydrazono)methyl]-1-methylpyridinium methylsulfate, 4-[(E)-({bis[4-(diethylamino)phenyl]methylene}hydrazono)methyl]-1-methylpyridinium methylsulfate, 4-[(E)-(9H)-fluoren-9-ylidenehydrazono)methyl]-1-methylpyridinium methylsulfate, 3-[(E)-({bis[4-(dimethylamino)phenyl]methylene}hydrazono)methyl]-1-methylpyridinium methylsulfate, 4-{(E)-[(2Z)-2-(3,4-dimethyl-1,3-thiazol-2(3H)-ylidene)hydrazono]methyl}-1-methylpyridinium methylsulfate and 4-[(E)-({bis[4-(dimethylamino)phenyl]methylidene}hydrazono)methyl]-1-methylquinolinium methylsulfate.