Shading process using poly-functional reactive and non-reactive

Bleaching and dyeing; fluid treatment and chemical modification – Reactive dye composition – process – or product

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Details

8532, 8638, 8918, 8924, C09B 6200, C09B 6724, D06P 138

Patent

active

045042721

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.

REFERENCES:
patent: 2459771 (1949-01-01), Fox
patent: 3223470 (1965-12-01), Boedeker et al.

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