| 摘要 |
Disclosed are disazo and trisazo dyes free of sulfo groups which contain two 6-hydroxy-4-methyl-3-N-pyridiniumpyridone-2 coupling component radicals, preferably dyes of the formula <IMAGE> wherein R is a tetrazo component radical, EACH R1 is independently hydrogen, C1-4alkyl, C1-4hydroxyalkyl or -NR3R4, wherein each of R3 and R4 is independently n-C1-4-alkyl, EACH R2 is independently hydrogen, n-C1-4alkyl, n-C1-4-hydroxyalkyl or C1-4alkoxy, and EACH A- is an anion. |
