Patent ID: 6953846

Claim:
A pyridone azo dye of formula wherein A is a radical of formula wherein R 7 is hydrogen or halogen, R 8 is hydrogen, halogen, cyano, —CF 3 , —COOR 11 wherein R 11 is C 1 -C 4 alkyl and the alkyl chain can be interrupted by oxygen, or is benzyl or —SO 2 R 12 wherein R 12 is —NR 13 R 14 or phenyl and R 13 is hydrogen or C 1 -C 4 alkyl and R 14 is C 1 -C 4 alkyl or benzyl, R 9 is hydrogen or halogen, and R 10 is hydrogen or a radical —SO 2 —O—C 6 H 5 R 1 is hydrogen, unsubstituted or hydroxy- or phenyl-substituted C 1 -C 6 alkyl, it being possible for the alkyl chain to be interrupted from C 3 upwards by one or more oxygen atoms, or has the meanings of R 2 , R 2 is a radical of formula wherein B is a bridging member, R 4 is alkyl or aryl, R 5 and R 6 are each independently of the other alkyl, aryl or heteroaryl and A is as defined for formula (1), or R 1 and R 2 together with the nitrogen atom in —NR 1 R 2 form a heterocyclic ring, Y is cyano, —CONH 2 or —CH 2 SO 3 H, and n is an integer from 2 to 6.