Azo dyes and pigment forms the largest group of all the synthetic colorants and play a prominent role in almost every type of applications. In the last couple of decades a number of major changes have occurred primarily aimed at minimizing the major weakness of anthraquinone dyes. For this purpose attempts were made to replace anthraquinone dyes by azo dyes. For this purpose we have undertaken the work in this direction with a view to synthesize novel bisazo-bisazomethine disperse dyes. Therefore, it is worthwhile to describe the chemistry and development of azo and bisazo dyes in brief for the sake of better understanding. Bisazo and bisazomethine dyes are of current important, however there are very few reports regarding bisazo-bisazomethine disperse dye. In the textile industry, different fibers used for dyeing are all natural fiber like cellulose (linen, cotton) or animal protein fibers (wool, silk, animal hair) and synthetic fibers like nylon, polyester, polyacrylonitrile and blends of two or more fibers. The development of a new substrate presents new dyes and dyeing methods and it influence dyeing technology in a fundamental manner. New bisazo-bisazomethine disperse dyes were prepared by the coupling of diazotized solutions of various aromatic primary amines with 2, 2’-{1,4-phenylenebis [nitrilomethylylidene]} diphenol (Schiff base ). Schiff base was prepared by the condensation of 2-hydroxybenzaldehyde with 4-aminoaniline. The resultant dyes were characterized by elemental analysis, IR and 1H NMR Spectral Studies. The UV-visible absorption spectral data were investigated in dimethylformamide (DMF) and are discussed in terms of structure property relationship. The dyes when applied on polyester fabric, gave pale yellow to orange shades having fairly good to good light fastness, very good to excellent washing, perspiration and sublimation fastness and good to very good rubbing fastness properties.
Bisazo-bisazomethine; Schiff base; Polyester; Disperse dyes
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