Synthesis and application of some new disperse azo dyes derived from 2cyanomethyl benzothiazole

• Published in: Pigment & resin technology 2007-11, Vol.36 (6), p.382-391
• Main Authors: ElKashouti, M.A., Elgemeie, G.H., ElMolla, M.M, ElSayad, H.S., Ahmed, K.A.E.
• Format: Article
• Language: English
• Subjects: Dyes; Textile fibres
• ISSN: 0369-9420
• DOI: 10.1108/03699420710831809

Purpose To synthesize some new heterocyclic disperse azo dyes and their utilization in textile printing. Designmethodologyapproach To prepare 1cayno1substituted aryl azo2methyl benzothiazole by the reaction of 2aminothiophenol with malononitrile and the end product coupled with different diazonium salts. The prepared dyestuffs are established using element analysis, IR measurements, 1HNMR and Mass spectra. Printing pastes containing the prepared dyestuffs and a thickener were used for printing polyester andor nylon 6 using either transfer printing or traditional printing. Findings New selected arylazo cyanomethyl benzothiazole dyes were obtained from the reaction of diazotized aniline derivatives with 2cyanomethyl benzothiazole as a coupling component. The suitability of the prepared dyestuffs for either heat transfer printing or traditional printing on polyester and nylon 6 fabrics has been investigated. The prints obtained from dyes containing non polar groups which have sublimation properties possess high colour strength as well as good overall fastness properties if compared to those obtained using dyes containing polar groups. Research limitationsimplications The new heterocyclic disperse azo dyes were prepared from 2cyanomethylbenzothiazole and were utilized in preparing pastes for textile printing to print polyester and nylon 6 fabrics. In addition, the variation in substituents on the synthesized dyes could also be studied. Practical implications The method of synthesis of the new dyestuffs provides a simple and practical solution to prepare some new heterocyclic disperse azo dyes with low molecular weight, suitable for sublimation in heat transfer printing methods. Originalityvalue The methods for synthesis of the new heterocyclic disperse azo dyes are simple. These dyestuffs could be used in textile printing of polyester and nylon 6 on an industrial scale.