A Study on the Synergism and Crystal Form of some Dichlorobenzidine Disazo Yellow Pigments

Add time:08/07/2019    Source:sciencedirect.com

Three series of synergistic pigments of the disazoacetoacetanilide yellow type, mainly related to C.I. Pigment Yellow 12,13,14,17, and 63, were synthesized. The synergistic effect was examined and comparison of the color properties of the synergistic pigments with those of the corresponding physical mixtures and of the individual pigments indicated that the classical pigments could be modified by synergism. An attempt was also made to ascertain the reasons for the synergism by using X-ray powder diffraction and scanning electron microscopy. It was found that solid solutions were formed over a large range of concentrations of the components. This leads to improvements in the aggregation and the dispersibilities of the pigments, and, as a result, improves the pigment properties. The isomorphism of C.I. Pigment Yellow 14 and 63, as well as the polymorphism of C.I. Pigment Yellow 17, is also discussed.

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