| abstract |
Benzophenonazo dyes have formula (I), in which the A ring may be benzenically annelated and a benzenically annulated A ring may be bridged; m is 1 or 2; K stands for the residue of a coupling component; Y stands for hydrogen or arylazo; X?1 and Z2¿ represent independently from each other hydrogen or hydroxysulfonyl; R?1, R2 and R3¿ represent independently from each other hydrogen, halogen, C¿1?-C12-alkyl, cyclohexyl, phenyl, 2-hydroxyethylsulfonyl or C1-C4 alkoxy or, when m is 1 and Y stands for hydrogen, one of these substituents may also stand for the residue having formula (a), in which L?1¿ stands for a chemical link or a bridging element and X?1, X2, R4¿, K and the A ring have the above-mentioned meaning; and R4 stands for hydrogen, halogen or C¿1?-C4-alkoxy, provided the molecule contains at least one water-soluble rendering group. Also disclosed are new pyridone compounds, a process for producing bisulphonated pyridone compounds and the use of these new dyes for dyeing natural or synthetic substrates. |