Trisazo dyes

Abstract

Abstract The invention concerns trisazo dyes, in the free state or as transition-metal complexes, of general formula (I) in which the variables are defined as follows: R1 hydrogen, C¿1?-C4 alkyl, halogen, nitro, hydroxysulphonyl, sulphamoyl, mono or di-(C1-C4 alkyl)-sulphamoyl, (C1-C4 alkyl)-sulphonyl or (C1-C4 alkoxy)-sulphonyl, R?2¿ hydrogen, halogen, nitro or hydroxysulphonyl, at least one of the groups R?1 and R2¿ being nitro, R3, R4 independently of each other, hydroxy or amino, R5 hydrogen, C¿1?-C4 alkyl, hydroxysulphonyl, sulphamoyl, mono- or di-(C1-C4 alkyl)-sulphamoyl, (C1-C4 alkyl)-sulphonyl, (C1-C4 alkoxy)-sulphonyl or carboxyl, R?6¿ hydrogen or C¿1?-C4 alkyl, R?7¿ hydrogen, C¿1?-C4 alkyl, hydroxysulphonyl, sulphamoyl, mono- or di-(C1-C4 alkyl)-sulphamoyl, (C1-C4 alkyl)-sulphonyl, (C1-C4 alkoxy)-sulphonyl, SO2N(CH2COOH)2 or carboxyl, R?8¿ hydrogen, C¿1?-C4 alkyl, hydroxy, C1-C4 alkoxy, halogen or nitro, with the provision that at least one of the two groups R?5 and R7¿ is COOH or SO¿3?H and, when R?5 or R7¿ is SO¿3?H, the other is COOH or R?3¿ and/or R4 is amino or R1 is hydrogen or R6 is alkyl. Such dyes are suitable for use in dyeing leather, textile fibres and paper.

Inventors

• 👤 Gerhard Scholz
• 👤 Gunther Lamm

Bibliographic Details