Industrially applied disperse dyes are based on numerous chromophore systems. Approximately 60 % of all products are azo dyes, and ca. 25 % are anthraqui — none dyes, with the remainder distributed among quinophthalone, methine, naphthalimide, naphthoquinone, and nitro dyes [9].
Azo dyes are currently employed to create almost the entire range of shades; anthraquinone derivatives are used for red, violet, blue, and turquoise. The remaining dye classes are used mainly to produce yellow shades. Fastness properties and often also the structures are disclosed in the Colour Index [10].