Patent ID: 6500247
Filing Date: 2002-12-31
Classification: C09B,C09D,D06P

Abstract:
A black-dyeing aqueous ink comprising20 to 95% by weight of at least one dye (A), together with 5 to 80% by weight of at least one dye selected from the group consisting of (B) and (C), based on the total weight of the dyes (A), (B) and (C) in the ink, and 1 to 40% by weight of a water-miscible organic solvent, based on the total weight of the ink, the dye (A) containing, as the colouring part of the molecule, one or more radicals of the formula (I), (II), (III) or (IV) â€ƒthe dye (B) containing, as the colouring part of the molecule, one or more mono- or disazo radicals containing sulfo groups or one or more radicals of the formula (V), (VI), (VII) or (VIII) â€ƒand the dye (C) containing, as the colouring part of the molecule, one or more mono- or disazo radicals containing sulfo groups or one or more radicals of the abovementioned formula (V), (VI), (VII) or (VIII) and one or more radicals of the abovementioned formula (I), (II), (III) or (IV), in which (G)0-2 is 0 to 2 identical or different substituents selected from the group consisting of substituted or unsubstituted amino, hydroxyl and nitro, L is substituted or unsubstituted amino, R is halogen, C1-C4alkyl, C1-C4alkoxy, C2-C4alkanoylamino, hydroxyl, carboxyl, nitro or cyano, (V)0-2 is 0 to 2 identical or different substituents selected from the group consisting of halogen, C1-C4alkyl, C1-C4alkoxy, &bgr;-sulfatoethylsulfonyl and sulfo, (W)0-1 is an N-acyl radical, n is the number 0, 1, 2 or 3, m is the number 1, 2 or 3 and r and q are the number 0 or 1.