Benzimidazolone Pigment Brown

Red benzimidazolone pigments, which cover the entire range of shades in the red and brown part of the spectrum, are based on the following general structure ... 

This disazo condensation pigment, is a recent product. It affords very yellowish shades of brown, covering the range of the displaced benzimidazolone pigment P.Br.32. In terms of fastness and application properties, P.Br.41 largely resembles other representatives of its class. 

While the acetoacetyl derivative 1 provides greenish yellow to orange products, the naphthoylamino compound 2 affords colorants having medium red to carmine, maroon, bordeaux or brown shades. Figure 10-2 summarizes the Colour Index data, shades and structural formulae of commercial available benzimidazolone pigments. 

Figure 10.2b Colour Index data, shades and structural formulae of commercially available benzimidazolone pigments (red and brown).

Suzuki, E. M., and W. P. Marshall. "Infrared Spectra of U5. Automobile Origincd Topcoats (1974-1989) III. In Situ Identification of Some Organic Pigments Used in Yellow, Orange, Red, eind Brown Noiunetallic and Brown Metallic Finishes—Benzimidazolones." Journal of Forensic Sciences 42 (1997), 619-648. 

Brown pigments iron oxide brown, benzimidazolone brown... 

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