Cationic pyridone azo dyestuffs, certain novel coupling components from which they are derived and processes for the manufacture of the dyestuffs and the coupling components.

摘要

The dyestuffs are prepared by diazotation of an amine, reaction with a pyridone coupling component carrying in the 3-position a 5- or 6-membered heterocyclic ring containing an o-nitrogen and an o-sulphur or second nitrogen atom and quaternisation. A further carbocyclic or heterocyclic ring may be fused to the first. The novel pyridone coupling components carry a 3-benzimidazole or a 3-benzthiazole substituent and are made by reacting a 3-cyano pyridone with an o-phenylene diamine or o-aminothiophenol in the presence of anhydrous aluminium trichloride. The dyestuffs colour acrylic materials bright yellow shades of high tinctorial strength. They have good fastness properties and compatibility values.