FORMAZAN COMPOUND AND DYEING OF FIBROUS MATERIAL USING IT

NEW MATERIAL:A compound in the form of a free acid shown by the formula I [D is group of formazan compound shown by the formula II (m is 2, or 3; benzene nucleuses A-C may contain sulfonic acid or chlorine); n is 0 or 1; p is 1, or 2; Y is anion; R3 is H, or CH3 when n is 0; A is D or (substituted) phenyl; when A is D, R3 is H; when n is 1, R1 and R2 are H, or CH3; B is -(CH2)l -(l is 2-6), (substituted) phenylene, etc.; X is group shown by the formula III(COOH is in 3- or 4-position), Cl, or F; R3 is H, (substituted) 1-2C alkyl, etc.]. EXAMPLE:A compound shown by the formula IV. USE:Dye for dyeing cellulose fiber, especially mixed fabric of polyester and cotton with improved fastness to wetting, chlorine, light, sweat and sunshine, etc. in blue. PREPARATION:For example, a triazan compound shown by the formula D-NH2 is reacted with a triazine compound shown by the formula V (X1 is Cl, or F), then with an amine shown by the formula VI, further with (iso)nicotinic acid.