The present work aims to investigate and develop a series of diearboxylic-azo dyes for polyester/wool blend fabrics. These dyes were obtained by the coupling of diazotised 2-aminobenzoic acid ,3- aminobenwic acid and 4- aminobenzoic acid with 3 – hydroxy naphthoic acid, salicylic acid. The resulting carboxylic-azo dyes were subjected to LC-Mass, IH-NMR. All of dicarboxylic-azo dyed were dyed on polyester, wool polyester/wool blends fabrics, and fastness properties evaluated. The fastness properties of all the dyeing samples were in accord with commercial requirements,Introduction of two carboxy groups to the azo dye skeleton enhances the solubility of dye, giving the dye ability of wool increase. Three of them was found to dye polyester and wool fibers to approximately the same depth.
