US 4,504,272 A · Shading process using poly-functional reactive and non-reactive dyestuffs bonded in fixing

Abstract

Color gaps in a product range of reactive dyestuffs are thought of in industry as disadvantageous. The reasons for the existence of gaps can be due to problems of synthesis and reproducibility and also to inadequate wear properties. In accordance with the invention, it has now been found that such missing shades can be dyed by means of mixtures of reactive dyestuffs containing at least two reactive groups and water-soluble, non-reactive dyestuffs containing at least one reactive hydrogen atom. When dyestuff combinations of this type are applied to fibers containing hydroxyl and/or carboxamide groups, the reactive dyestuff fulfills the function of a linking member between the fiber and the non-reactive shading dyestuff, as a result of which a homopolar bond is formed, and this results in very fast dyeings and prints, while at the same time building up the desired shade.

Claims10

Dependent claims

In a process for adjusting dyeing recipes in order to dye a shade which is not directly accessible by the normal practice of starting from trade products which dye in a single hue, by having recourse to combinations of components which do not have identical hues and which, when applied to textile substrates containing hydroxyl and/or carboxamide groups, are capable of forming, in the course of a fixing operation at ordinary or elevated temperatures and under the influence of acid-binding agents, homopolar bonds with the said groups of the fiber substance, the improvement which comprises selecting dyestuff mixtures which are comprised of:

(a) at least one water-soluble, polyfunctional reactive dyestuff, the molecule of which contains two or more, optionally different, fiber-reactive groupings, or which is capable of forming two or more such groupings under the influence of an acid-binding agent when dyeing or printing the textile material, and
(b) at least one water-soluble dyestuff which is not of itself fiber-reactive, the molecule of which contains, or is capable of making available under the influence of an acid-binding agent when dyeing or printing the textile material, one or more reactive hydrogen atoms.

Dependencies are inferred from the claim text.

Shading process using poly-functional reactive and non-reactive dyestuffs bonded in fixing

Life of this patent

Shading process using poly-functional reactive and non-reactive dyestuffs bonded in fixing

Life of this patent

Abstract

Claims10