Solid dyestuff formulations containing ethylenically unsaturated acid, ester and acrylonitrile copolymer

US4502863A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Wolfgang Bornatsch · Cologne, DE
• Robert Kuth · Cologne, DE
• Hermann Perrey · Krefeld, DE

Key dates

• Filing date: Jun 3, 1983
• Grant date: Mar 5, 1985
• Expiry date: Jun 3, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S8/922
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Solid dyestuff formulations having excellent dyebath stability are obtained in an economical manner by mixing a water-insoluble textile dyestuff with a dispersant and a carboxyl-containing copolymer of PA1 (a) an .alpha.,.beta.-ethylenically unsaturated monocarboxylic acid, PA1 (b) a non-basic ester of an .alpha.,.beta.-ethylenically unsaturated monocarboxylic acid, and PA1 (c) an unsaturated aliphatic or aromatic hydrocarbon or acrylonitrile, bead-milling the mixture down to a particle size of, preferably, 1-2.mu., and then spray-drying the ground mixture. If desired the dispersant can also be added during the synthesis of the dyestuff, as a consequence of which early addition the milling process can be dispensed with.