| abstract |
A water soluble disazo colorant represented by formula (I) in the form of free acid: <IMAGE> (I) wherein K represents <IMAGE> +TR <IMAGE> [wherein A represents a methyl group or a carboxylic group; R2 represents a hydrogen atom, an alkyl group of 1 to 8 carbon atoms, a sulfoalkyl grouop of 1 to 4 carbon atoms, or an alkyl group of 1 to 4 carbon atoms which is substituted by an alkoxy group of 1 to 4 carbon atoms; R3 represents a hydrogen atom, a halogen atom, a cyano group, a -CONH2 group, a carboxyl group, a sulfonic group, or a sulfomethyl group, p represents an integer of 1 or 2]; Z represents a fluorine atom or <IMAGE> [wherein R4 represents a hydrogen atom or an alkyl group of 1 to 4 carbon atoms; R5 and R6 each represents independently a hydrogen atom, an alkyl group of 1 to 4 carbon atoms, an alkoxy group of 1 to 4 carbon atoms, a sulfonic group, or a halogen atom; Y represents -SO2CH=CH2 or -SO2CH2CH2W (wherein W represents a group which is released by the action of an alkali)]; R1 represents a hydrogen atom or a lower alkyl group of 1 to 4 carbon atoms; Q represents a divalent aromatic or aliphatic residual group; and l, m, and n each represents an integer of 0 or 1. Such colorants are useful in the dyeing of fibrous materials. |