| abstract |
The invention refers to the manufacturing of a novel group of sulfur dyes in which are used, as raw material, different kind of natural "biomass", usually existing in the nature, and transforming them into soluble dyestuffs, capable to dye textile fibres, preferably cellulose fibres and derivatives, as cotton, viscose, paper, tencel, with high strength and fast colour properties. n For this purpose, the concept "Biomass", is defined as the residual product obtained from the usual human crop activities, in agricultural and forestry sectors. |