Dye-fibre Bond Stabilities of Dyeing of Bifunctional Reactive Dyes Containing a Monochlorotriazine and a beta-Hydroxyethylsulphone sulphuric acid ester Group

The dye-fibre bond stabilities of various bifunctional dyes (commercially known as Sumifix Supra dyes) have been investigated by measuring the kinetics of dye-cotton bond hydrolysis in aqueous buffer solution at 98 °C. The stabilities are generally found to be somewhat higher than those of comparable monofunctional reactive dyes. Significantly better, however, is the fixation yield of the bifunctional dyes. Reasons for a very low uptake of a non-commercial bromamine acid-based bifunctional dye are discussed