Patent ID: 6906195

Claim:
A pyridone dye of formula wherein R is a radical —(CR′H) n —W, R′ is hydrogen, C-C 2 alkyl or phenyl, Y is cyano, —CONH 2 or —CH 2 SO 3 H, W is hydrogen, a radical —NR 1 R 2 or a radical —OR 3 , R 1 and R 2 are each independently of the other hydrogen, unsubstituted or hydroxy- or phenyl-substituted C 1 -C 6 alkyl, it being possible for the alkyl chain from C 3 upwards to be interrupted by one or more oxygen atoms, or a radical of formula or R 1 and R 2 together with the nitrogen atom in —NR 1 R 2 form a heterocyclic ring, R 3 is hydrogen, unsubstituted or hydroxy-substituted C 1 -C 6 alkyl, phenyl or a radical of formula R 4 is alkyl or aryl, R 5 and R 6 are each independently of the other alkyl, aryl or heteroaryl, n is an integer from 2 to 6, and m is an integer from 1 to 6.