new technique of dyeing textiles with vat dyestuffs.

摘要

the present invention relates to the use of a new technique in the pretreatment of the fibres, yarns, fabrics, knitted articles and works to improve the performance of the textile dye vat dyes and in particular the indigo.the technique that we propose in this patent is to treat the textile articles prior to the step of dyeing with cationic compounds. this new technique offers a number of advantages: higher than yields obtained with the usual dye dyeing by conventional methods and, in particular, the vat dyes, indigo.- the possibility of indigo dye in the textile articles using conventional processes (processes with dye exhaustion) yields exceed those normally achieved with conventional methods (impregnation).the feasibility of dyeing textile articles by the vessel and, in particular, the colours of green and indigo by using non conventional reducing dye yields above those normally achieved with conventional methods employing the dithionit (e) as a reducing agent.- waste water generated by the residual dye baths are less loaded with pollutants than those typically generated by conventional methods. the dyes obtained with this technique have rub fastness to light, washing, and higher than those usually obtained with conventional methods.the dyes obtained with this technique are brighter than those usually obtained with conventional methods.