abstract |
An azo dye of the formula (1) in which Y is -CH> = CH2 or -CH2CH2Z, in which Z is an alkaline separable group; R is a radical -COOR1, -CN or -CONR2R3, in which R1 is M or (C1-C4) -alkyl; R2 and R3, independently of each other, are hydrogen or (C1-C4) -alkyl; and M is hydrogen, ammonium, an alkali metal, or the equivalent of an alkaline earth metal. |