Fibre reactive azo dyes

A dyestuff of the formula I

• wherein
• each of R1, R2, R3, R4 and R5, independently, is H or an optionally substituted alkyl group;
• each of X1 and X2, independently, is a labile atom or group;
• each of x and y, independently, is 0 or 1 and at least one of x and y is 1;
• each of a and b is 2 to 5 and when each of x and y is 1, a>b;
• and
• z is 0, 1, 2, 3 or 4,
• D1 is a group of the formula II
• wherein
• B is H or SO3M;
• M is H, an alkali metal, an ammonium ion or the equivalent of an alkaline earth metal;
• *indicates the bond to the triazinylamino group;
• Ar1 is a group of the formula III or of the formula IV
• wherein
• the or each Y independently is SO3M or an alkyl group, c is 0, 1 or 2, M is defined as given above and # indicates the bond to the azo group;
• or
• D1 is a group of the formula IIa
• wherein
• B is H or SO3M;
• M is H, an alkali metal, an ammonium ion or the equivalent of an alkaline earth metal;
• *indicates the bond to the triazinylamino group;
• Ar4 is a group of the formula IIIa or of the formula IVa
• wherein
• Y2 is —N═N—Ar5, M is defined as given above and # indicates the bond to the azo group, wherein
• Ar5 is a group of the formula IIIb or of the formula IVb
• wherein the or each Y3 independently is SO3M or an alkyl group, d is 0, 1 or 2, M is defined as given above and # indicates the bond to the azo group;
• or
• D1 is a group of the formula V
• wherein
• M, * and Ar1 are defined as given above;
• or
• D1 is a group of the formula VI
• wherein
• * is defined as given above
• n is 0, 1, 2 or 3;
• the or each R6 independently is H, (C1-C4)-alkyl, (C1-C4)-alkoxy, NHCONH2, NHCO(C1-C4)-alkyl, SO3M or halogen;
• Ar2 is a group of the formula VII or of the formula VIII
• wherein
• the or each Y1 independently is SO3M or an alkyl group or —N═N—Ar3, wherein:
• Ar3 is an optionally substituted phenylene or naphthylene moiety;
• c is 0, 1 or 2, M is defined as given above and # indicates the bond to the azo group;
• or
• D1 is a group of the formula (XV)
• wherein R6, Ar1, n and * are defined as given above or
• D1 is an azoacetoacetamidoaryl, azopyridone, azopyrazolone or an azopyrimidine chromophore;
• D2 is a group of the formula II, provided D1 is not a group of the formula V;
• or
• D2 is a group of the formula IIa;
• or
• D2 is a group of the formula IX
• wherein
• A and E are independently OH or NH2 and A≠E;
• G is H, (C1-C4)-alkyl, (C1-C4)-alkoxy, SO3M or halogen;
• and
• Ar1, M and * are defined as given above;
• or
• D2 is a group of the formula VI;
• or
• D2 is a group of the formula X
• wherein M and * are defined as given above;
• or
• D2 is a group of the formula XI
• wherein M and * are defined as given above;
• or
• D2 is a group of the formula XII
• wherein
• R7 is H or (C1-C4)-alkyl;
• L is a divalent moiety and
• M and * are defined as given above;
• or
• D2 is a group of the formula XIII
• wherein
• R8 and R9, independently, are H, halogen, (C1-C4)-alkyl or (C1-C4)-alkoxy;
• and
• M, Ar1 and * are defined as given above;
• or
• D2 is a group of the formula XIV
• wherein
• M′ is a metal atom;
• Pc is a phthalocyanine chromophore;
• e is <4;
• and
• M, L and R7 are defined as given above;
• or
• D2 is a group of the formula XV;
• or
• D2 is an azoacetoacetamidoaryl, azopyridone, azopyrazolone or an azopyrimidine chromophore.