| 摘要 |
There are described new blue cationic oxazine dyes of the formula <IMAGE> in which R1, R2, R3 and R4 independently of one another are each C1-4-alkyl, with R1 and R2 together with the nitrogen atom also being able to form a heterocyclic ring, and X(-) is an anion; these dyes are distinguished in particular by an excellent migration capacity on polyacrylonitrile fibres. |
