Abstract
The synthesis of oligomeric acid azo dyes A-1 to A-11 was carried out by coupling reaction of trimethylolmelamine-1-naphthol oligomer A, respectively, with diazonium salts of p-aminobenzoic acid, sulphanilic acid and nine different amino naphthalene sulphonic acid derivatives. The chemical structures of the novel coupling oligomer A and all the oligomeric acid azo dyes A-1 to A-11 were established by elemental analysis and spectral studies (IR, UV-visible). The number average molecular weight of oligomer A was estimated by nonaqueous conductometric titration. The dyeability of all of the dyes on wool, silk and nylon fabrics was assessed by exhaustive dyeing, producing attractive shades varying from purple to off-white brown fabrics. The dyeing behavior was evaluated in terms of washing fastness and light fastness properties. It was observed that these novel oligomeric acid azo dyes exhibited attractive brilliant shades with excellent washing fastness and moderate light fastness properties.
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