based on sulphonated dispersants of lignin method for their preparation and their use in colouring compositions

摘要

Dispersants particularly useful for insoluble dyes such as disperse and vat dyes are lignin adducts made from sulfonated lignin materials, which include spent sulfite liquors, sulfonated lignin and lignosulfonates, by reaction with mono or polyhydroxyl benzyl alcohol compounds, and are characterised by high levels of heat stability, desirable dye reduction, staining, foaming, milling and viscosity-reducing properties. Dyestuffs, dye pastes and dye baths, as well as methods utilizing them, are disclosed.