Reactive dyes containing a benzimidazolone residue

During the investigation of dyeing properties of reactive dyes containing a benzimidazolone residue the negative influence of salt concentration on th eir exhaustion was demonstrated. In the case of model dyes not containing t he reactive group, change in aggregation state at various temperatures was investigated. It has been shown that the reactive dyes containing a benzimi dazolone residue may undergo excessive aggregation in concentrated sodium c hloride solution. This may cause difficulties in the dyeing process.