High organic pigments

Anthrapyrimidines. Anthrapyrimidines are yellow vat dyes and exhibit good fastness. Cl Vat Yellow 20 [4216-01 -7] (5) (Cl 68420) is the only example that is currendy produced. The production method is shown in the following scheme. This compound is also used as a high performance organic pigment (Cl Pigment Yellow 108). 

Among these dye classes, anthraquiaone dyes are ia an important position ia reactive dyes and vat dyes for cellulose fibers, disperse dyes for polyester, and acid dyes for polyamide. Application for high performance organic pigments for plastics and paints are also important areas. 

Contamination is not restricted to natural products. Organic pigment powders are often precipitated from aqueous solutions and washed with water prior to drying. These have been found to contain high numbers of microbes and have been implicated in contamination instances. 

Other chemical types of high-performance organic pigments are exemplified by the tetrachloroisoindolinone 222 (C. I. Pigment Yellow 110) and the dioxazine 223 (Carbazole Violet, C. I. Pigment Violet 23). Considerable research has been carried out in an attempt to exploit the potential of metal complex chemistry to provide high-performance pig-... 

M. Puchalska, K. Polec Pawlak, I. Zadrozna, H. Hryszko and M. Jarosz, Identification of indigoid dyes in natural organic pigments used in historical art objects by high performance liquid chromatography coupled to electrospray ionization mass spectrometry, J. Mass Spectrom., 39, 1441 1449 (2004). 

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