Patent ID: 8409300

Claim:
Novel Disperse azo dyes of formula (1) wherein, R 1 is hydrogen, methyl, hydroxyl or NHR 3 ; R 3 is —COCH 3 , —COC 2 H 5 , —SO 2 CH 3 or —SO 2 C 2 H 5 R 2 is hydrogen, chloro or methoxy; wherein, D is a group of the formula (2a) wherein, X, Y and Z are, independently, hydrogen, methyl, halogen, cyano or nitro; with the proviso: only when both Y and Z are simultaneously selected from methyl, halogen, cyano or nitro, then both R1 and R2 are simultaneously hydrogen; Or a group of the formula (2b), wherein, T 1 is independently halogen or nitro, T 2 is hydrogen or halogen; with the proviso: When T 1 is Nitro, T 2 is not hydrogen; Or a group of the formula (2c), Or a group of the formula (2d), wherein, T 3 and T 4 are independently nitro, acetyl, COOR 4 or cyano; R 4 is C 1 to C 4 unsubstituted alkyl; n and m are independently 0, 1 or 2.