Patent ID: 7078497

Claim:
A dye of formula wherein Z 1 is NHR 6 , R 6 being a radical of formula CO—NH—R 8 , SO 2 -alkyl or COOR 8 , R 8 being hydrogen, alkyl or aryl and Z 2 is as defined for Z 1 or is hydrogen, hydroxy, alkoxy or a radical NHR 5 , R 5 being hydrogen, alkyl, aryl, COR 8 , CO—NHR 8 or SO 2 R 8 , R 1 and R 3 are each independently of the other hydrogen, hydroxy, alkyl or alkoxy, R 2 and R 4 are each independently of the other hydrogen, hydroxy, alkyl or alkoxy, halogen, sulfo, carboxy, NHCONHR 8 or NHCOR 8 , X is azo, azoxy, —NR 8 —, —NR 8 CONR 9 — or a group of formula Y being hydroxy, alkoxy or NR 9 R 10 , R 9 and R 10 being each independently of the other hydrogen, unsubstituted or substituted alkyl or unsubstituted or substituted aryl, n and m are each independently of the other 1 or 2, and wherein the rings A and B may each independently of the other carry a fused-on benzene ring.