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

US4504272A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventor

• Sienling Ong · Hofheim, DE

Key dates

• Filing date: Dec 21, 1983
• Grant date: Mar 12, 1985
• Expiry date: Dec 21, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S8/924
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

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.