| 摘要 |
New metal-free or metallised compounds of formula I, free from sulphonic acid groups, are useful for dyeing paper, textiles and leather <IMAGE> wherein the two pyridone couplers are identical; each n is 0, 1 or 2; R1, R2 and T are each H or specified substituents; X0 is a direct bond or a bridging group; and B is -A, -NR7R8 or <IMAGE> where A1 is C2-8-alkylene and R7-R9 are specified substituents or form a ring with the adjacent nitrogen atom. |
