A reactive disperse dye containing a temporarily anionic sulphatoethylsulphone and nonionic disulphide bis (ethylsulphone) groups was applied to cotton/polyester fiber by the exhaust dyeing at a verity of pH and temperature conditions. A mono functional reactive disperse containing only nonionic disulphide bis (ethylsulphone) groups was also its dyeing behaviour was compared with the bifunctional dye. The bifunctional reactive disperse dye exhibited high exhaustion and fixation values at pH 6 and 1200C.

The result also indicate that the combination of temporarily anionic and nonionic reactive groups of the bifunctional dye provided great enhancement in dyeing performance compared to that of monofunctional dye. The dye also showed very good leveling and fastness properties.


For dyeing cotton/polyester fiber is well reported dye. Its use of reactive disperse the advantages of these dyes stem from their excellent wet fastness and good coverage of the fiber, which overcome the leveling problems on cotton/polyester fiber with conventional reactive disperse dyes. Attempts have also been made to produce other types of reactive disperse dye carrying monocholorotriazine and vinyl Sulphone reactive disperse groups. The last year research in applied reactive disperse dye containing sulphatoethylsulphone reactive groups on nylon, silk and polyester fiber and dyeing properties of reactive disperse dye having sulphatoethylsulphone reactive groups and found that these dyes, when applied at 950C and pH8, exhibited excellent build-up profiled and wash fastness on cotton/polyester.

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This article was originally presented in ATNT 2007 held on 18-20, June 2007 at Kumaraguru College of Technology, Coimbatore, India. H. Najafi, E. Yzdanshenas & A. Rashidi are associated with Islamic Azad University Science and Research Branch, Tehran, Iran & F. Normohammadian is associated with Departments, Iran Color Research Center, Tehran, Iran.