Fibre-reactive monoazo dyestuffs

A compound of formula I ##STR98## or a salt thereof, or a mixture of such compounds or salts, in which each R.sub.1 is independently hydrogen, C.sub.1-4 alkyl or substituted C.sub.1-4 alkyl monosubstituted with a group selected from hydroxy, cyano, or chloro

• D is one of the radicals (a) to (f), ##STR99## in which R.sub.2 is hydrogen, or C.sub.1-4 alkyl,
• R.sub.3 is hydrogen, C.sub.1-4 alkyl, carboxy or --O--A.sub.1 --OR.sub.4,
• A.sub.1 is C.sub.2-4 alkylene,
• R.sub.4 is hydrogen, sulpho, C.sub.1-4 alkyl or C.sub.2-4 hydroxyalkyl,
• R.sub.5 is C.sub.2-4 alkyl,
• R.sub.6 is hydrogen or sulpho, and
• each R.sub.7 is independently hydrogen, C.sub.1-4 alkyl, C.sub.1-4 alkoxy or carboxy;
• each p is 0, 1 or 2,
• q is 1 or 2,
• r is 1, 2 or 3, and
• each t is 0 or 1;
• each of Z and Z.sub.4 is independently (z.sub.1), (z.sub.2) or (z.sub.3), ##STR100## in which T.sub.1 is hydrogen, or cyano,
• the two T.sub.2 's are the same and each T.sub.2 is fluoro or chloro,
• Hal is fluoro or chloro, and
• W.sub.1 is --NR.sub.1 --B.sub.1 --NR.sub.1 -- ##STR101## wherein each m is independently 0 or 1 and the marked nitrogen atom is bound to a carbon atom of the triazine ring,
• B.sub.1 is C.sub.2-4 alkylene;
• --C.sub.2-3 alkylene--Q--C.sub.2-3 alkylene-- in which Q is --O-- or --NR.sub.1 --;
• C.sub.3-4 alkylene monosubstituted by hydroxy, ##STR102## in which n is 0 or an integer 1 to 4,
• R.sub.8 is hydrogen, C.sub.1-4 alkyl, C.sub.1-4 alkoxy, carboxy or sulpho, and the marked carbon atom is attached to the --NR.sub.1 group which is bound to a carbon atom of the triazine ring;
• with the provisos that
• (i) ##STR103## when D is a radical (a) or (c);
• (ii) Z is (z.sub.1) or (z.sub.2), when D is a radical (b);
• and
• (iii) each of Z and Z.sub.d is independently (z.sub.2) or (z.sub.3), when D is a radical (d), (e) or (f), and at least one of Z and Z.sub.d is ##STR104##