| 摘要 |
Cationic dyestuffs of the formula <IMAGE> (I) wherein R1 and R2 independently of one another represent a lower alkyl, alkenyl or hydroxyalkyl radical, R3 represents H or halogen, R4 represents H, halogen, or a lower alkyl, alkenyl or alkoxy radical, R5 represents H or a lower alkyl radical, R6 represents a lower alkyl, alkenyl, halogenoalkyl, alkoxyalkyl, hydroxyalkyl or cyanoalkyl radical and X- represents an anion, at least one of the substituents R3 and R4 being other than H, are used for dyeing and printing natural and synthetic materials, in particular polyacrylonitrile.
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