| 摘要 |
<p>The condensation dyestuffs of the stilbene azo- or azoxysulphonic acid series are obtained by condensing sodium salts of low-sulphuric acid nitroarylsulphonic acid, in particular of 4-nitrotoluene-2-sulphonic acid, in the approximate molar ratio of 1 : 1 with sodium hydroxide solution at 40 DEG to 125 DEG C, in particular 70 to 105 DEG . In a one-pot reaction, the reaction mixture is converted without intermediate isolation into a novel dye preparation by neutralisation, optional adjustment of the colour strength with diluents and subsequent spray drying.</p> |
