Benzimidazolone moiety

The benzimidazolone moiety, a fundamental feature of all benzimidazolone pigments, is responsible for the high fastness of these pigments to the solvents which are typically found in application media. In this respect, benzimidazolone pigments perform much better than their counterparts in the monoazo yellow and... 

The combination of benzimidazolone moieties with the triphenedioxazine chro-mophore leads to imidazolone-annellated triphenedioxazine pigments, also called benzimidazolone-dioxazine pigments (4). In these pigments, the carbazole fragments of P.V. 23 are replaced by benzimidazolone moieties (Figure 20.6). 

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