| abstract |
Anthraquinone dyes of formula (I) are prepared by condensing N-(alkoxyformimidoyl)-anthraquinone (II) with esters or amides or cyanoacetic acid, or with malodinitrile: where A = an optionally substituted anthraquinone group; R1 = a carboxylic ester group, a carbonamide group, or a cyano group; and n = 1-4. Dyes (I) are used for the mass pigmentation of paints, plastics and for dyeing synthetic fibres. The dyes have a good colour yield, and generally excellent fastness. |