Reactive dye compounds

Abstract

A reactive dye compound comprising: (a) at least one chromophore moiety; (b) at least one SO2C2H4 group which is attached to the chromophore moiety either directly via the sulphur atom of the SO2C2H4 group or a linking group L; characterised in that at least one SO2C2H4 group is substituted on its terminal carbon atom with at least one Y group wherein Y is -A(CO)R* wherein A is selected from O or S and wherein R' contains at least one terminal nucleophilic group, such as OH, NH2, SH, COOH, N, NHR<1> and NR<1>R<2> wherein R<1> and R<2> may be the same or different and may be selected from C1-C4 alkyl; and salts thereof. Also claimed is a process of manufacture of the compounds herein and products obtainable by the process. The compounds herein have high Exhaustion Values (E), high Fixation Values (F) and high Efficiency Values (T) and show significant improvements in terms of reducing spent dyestuff in effluent, increasing dye affinity to the substrate, increasing the dye-substrate covalent bonding, increasing the ability to dye substrates at room temperature, decreasing the amount of dye that is removed during the post dyeing 'soaping off process' and therefore simplifying the post dyeing 'soaping off process' traditionally associated with dyeing cotton with fibre reactive dyes and reduction of staining of adjacent white fabrics. In addition, the compounds prepared above provide more intense dyeings and require less levels of salt for dyeing cotton substrates.

Description

technical field [0001] This invention relates to reactive dye compounds. In particular, the present invention relates to reactive dye compounds having improved dyebath exhaustion (E) and improved dye-fibre covalent fixation (F). Background of the invention [0002] Reactive dye compounds are known in the art for dyeing various substrates. Such matrices include, for example, proteinaceous materials such as keratin, which is found, for example, in hair, skin and nails and various animal body parts such as horns, hooves and feathers, and other naturally protein-containing substances such as silk, and carbohydrate-derived substances such as those derived from Those derived from cellulose or cellulose derivatives, such as natural products such as cotton, and synthetic fibers such as polyamides. [0003] Examples of such reactive dyes known in the art include dyes containing vinylsulfone groups or vinylsulfone precursor groups, such as those commercially av...

AI Technical Summary

Problems solved by technology

However, an urgent problem still faced by the fabric dye industry at present is that a large amount of dye remains in the wastewater after the dyeing process is completed.