Patent ID: 8088182

Claim:
A dye of formula wherein R 1 and R 2 are each independently of the other hydrogen, vinyl, allyl or C 1 -C 6 alkyl which is unsubstituted or substituted by cyano, carboxy, hydroxy, C 1 -C 6 alkoxy or C 6 -C 24 aryl, R 3 is hydrogen, C 1 -C 6 alkyl or C 6 -C 24 aryl, R 4 is hydrogen, C 1 -C 6 alkyl 2-Cyano-C 1 -C 6 alkyl, 2-Alkoxy-C 1 -C 6 alkyl, 2-Oxo-C 1 -C 6 alkyl or C 6 -C 24 aryl, n is 0, 1 or 2, and D denotes a radical of formula (3), (4), or (6) wherein R 6 and R 7 are each independently of the other hydrogen, nitro, cyano or halogen, R 8 and R 9 are each independently of the other hydrogen, nitro, cyano or halogen, R 14 represents nitro, cyano or halogen, and R 15 is C 1 -C 6 alkyl.