Pigments orange

Pigment Orange 5 [3468-63-1] 12075 monoa2o (Dinitraniline Orange) coupling of dia2oti2ed 2,4-dinitroaniline with 2-naphthol... 

Pigment Orange 43 [4424-06-0] 71105 Perinone condensation of naphthalene-1,4,5,8-tetracarboxyhc acid dianhydride with o-phenylenediamine, and separation of trans isomer... 

DiManro, A. et al.. Recovery of anthocyanins from pulp wash of pigmented oranges by concentration on resins, J. Agric. Food Chem., 50, 5968, 2002. 

For orange colours, simple 2-naphthol derivatives are the most commonly used coupling components as, for instance, in 2,4-dinitroaniline—>2-naphthol (4.118 Cl Pigment Orange 5). As in the yellow series, superior disazo pigments can be prepared using 3,3 -dichlorobenzidine as tetrazo component with derivatives of 1 -phenyl-3-methylpyrazol-5-one as couplers. 

Fig. 37 Dispersion of 5% Pigment Orange 43 in a toluene-based gravure printing vehicle with a paint shaker. Effect of the dispersion time and the dispersion temperature on the depth of shade (left) and on the hue of the prints (right).

Fig. 70 Electron micrograph of Pigment Orange 34 samples of different particle sizes.

Fig. 71 Particle size distributions of Pigment Orange 34 samples I and II.

Fig. 72 Pigment Orange 34 samples of different particle sizes (above small, below large) in a long-oil alkyd resin system. Pigment concentration in the system 6% thickness of the wet film 75 pm.

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