The synthesis and application of novel 2-chloro-4-alkylthio triazinyl reactive dyes

Two hetero bi-functional reactive dyes (red and yellow) each containing both a sulphatoethylsulphonyl and 2-chloro-4-alkylthio-s-triazinyl reactive group have been synthesised and their dyeing properties including exhaustion, colour strength on fabric (visual colour yield), fixation and wash fastness compared with market leading products. Under the alkaline application conditions employed, both the dyes, a yellow and a red, having a novel bridging group, exhibited good build-up, fixation and wet fastness properties being essentially comparable with leading commercial products. The concept of synthesising a substituent that can be introduced into a dye as a linking group to impart increased reactivity to a chlorotriazine has been demonstrated to be viable and effective.