Azo dyes

A dye of formula

• wherein Ar is a radical of formula (1a)-(1l)
• wherein
• R1 is hydrogen, C1-C12 alkyl, C1-C12 alkoxy or halogen,
• R2 is hydrogen, C1-C12 alkyl, halogen or —NHCOR8, wherein R8 is C1-C12 alkyl unsubstituted or substituted by one or more C1-C12 alkoxy groups, hydroxyl groups, amino groups or halogen atoms;
• C5-C30 aryl unsubstituted or substituted by one or more C1-C12 alkyl groups, C1-C12 alkoxy groups, hydroxyl groups, amino groups or halogen atoms;
• or C5-C30 heteroaryl unsubstituted or substituted by one or more C1-C12 alkyl groups, C1-C12 alkoxy groups, hydroxyl groups, amino groups or halogen atoms,
• R3 is C1-C12 alkyl unsubstituted or substituted by one or more C1-C12 alkoxy groups, hydroxyl groups, amino groups, —COOR8 groups, —OCOR8 groups, wherein R8 is as defined above, or halogen atoms;
• C2-C12 alkenyl unsubstituted or substituted by one or more C1-C12 alkoxy groups, hydroxyl groups, amino groups or halogen atoms;
• or C6-C36 aralkyl unsubstituted or substituted by one or more C1-C12 alkoxy groups, hydroxyl groups, amino groups or halogen atoms,
• R4 is hydrogen or C1-C12 alkyl,
• X is oxygen or sulfur,
• n is 0 or 1,
• m is a number from 1 to 5,
• R2 not being hydrogen or methyl when n=0 and m=1,
• Y is —CO— or —SO2—,
• R5, R6 and R7 are each independently of the others hydrogen, C1-C12 alkyl, C1-C12 alkoxy, halogen, —CN, —NO2, —CF3, —COOR8 or —CONHR9, wherein R9 is C1-C12 alkyl, C5-C30 aryl or C5-C30 heteroaryl,
• R10 is hydrogen, C1-C12 alkyl, C1-C12 hydroxyalkyl, C1-C12 cyanoalkyl, C5-C30 aryl or C6-C36 aralkyl,
• Z1 and Z2 are each independently of the other bromine, chlorine, cyano, nitro or trifluoro-methyl, but radicals of formula (1a) wherein Z1 and Z2 are chlorine are excluded,
• Z3 is bromine, chlorine, cyano, nitro, trifluoromethyl or C1-C12 alkyl,
• Z4 is chlorine or —CONH2,
• Z5 is chlorine, bromine, C1-C12 alkyl or C1-C12 alkoxy,
• Z6 and Z7 are each independently of the other hydrogen, bromine, chlorine, cyano, nitro or trifluoromethyl,
• Z8 is cyano, nitro or C1-C12 alkoxycarbonyl,
• Z9 is hydrogen, bromine, chlorine, C1-C12 alkyl, C5-C30 aryl or C6-C36 aralkyl, and
• Z10 is hydrogen, cyano, nitro or —COR4, wherein R4 is as defined above.