| 摘要 |
Compounds of the formula <IMAGE> in which R1 denotes aryl, alkyl, aralkyl, styryl or alkoxy, R2 denotes hydrogen, cyano, carboxyl or alkoxycarbonyl, inter alia, R3, R4, R6 and R7 denote hydrogen, alkyl, alkoxy or halogen, R5 denotes hydrogen, alkyl or aryl, R8 and R9 denote hydrogen, cycloalkyl, alkenyl, alkyl or aralkyl, A(-) denotes an anion, w denotes the valency of the anion A and n denotes 0 or 1, are outstandingly suitable for optically brightening synthetic fibre materials, in particular acrylic fibres. The new brighteners are prepared and used in accordance with methods which are in themselves known. |
