Abstract:
PROCESS FOR PRINTING TEXTILE MATERIALS OF NATURAL OR REGENERATED CELLULOSE WITH REACTIVE DYESTUFFS BY PRINTING ON SAID TEXTILE MATERIALS A PRINTING PASTE CONTAINING A THICKENING AGENT, WATER AND EITHER AN ORGANIC DYESTUFF CONTAINING AT LEAST ONE OF THE KNOWN REACTIVE GROUPS, OR AN ORGANIC DYESTUFF CONTAINING AT LEAST ONE NUCLEOPHILIC GROUP, AND A COLOURLESS ORGANIC COMPOUND WHICH CONTAINS AT LEAST TWO REACTIVE GROUPS WHICH ARE CAPABLE OF REACTING BOTH WITH THE FIBRE AND WITH THE NUCLEOPHILIC GROUPS OF SAID DYESTUFF, THEN PADDING THE PRINT SO ABTAINED, AFTER DRYING, WITH AN AQUEOUS SALT-CONTAINING SOLUTION OF AN AGENT HAVING AN ALKALINE REACTION AND SUBSEQUENTLY DWELLING THE PLAITED FABRIC.
Abstract:
Triphendioxazine reactive dyes have been found to be unsuitable for almost all conventional single-stage printing processes since these dyes are unstable under the conditions of said processes. … In the course of the development of an uncomplicated single-stage printing process for these dyes it has now been found according to the invention that by replacing the customary fixing alkali (NaHCO3) by stoichiometrically determined amounts of sodium acetate or sodium trichloroacetate or certain mixtures of sodium trichloroacetate with sodium acetate it is possible to fix triphendioxazine reactive dyes in full yields without hue change. Conventional print pastes may be applied at the same time.