Process for the printing of cellulose fiber fabrics

US4212648A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Horst Curtius · Kelkheim, DE
• Erich Feess · Hofheim, DE
• Willy Gronen

Key dates

• Filing date: Sep 7, 1978
• Grant date: Jul 15, 1980
• Expiry date: Sep 7, 1998

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D06P3/68
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Process for printing textile cellulose fiber fabrics with printing pastes containing coupling components dissolved in an alkaline medium, sodium nitrite and diazotizable primary aromatic amines, in which process the amines are used as a solution or in the form of an aqueous fine dispersion with a particle size of less than 0.03 mm and are selected in a manner such that they are paractically non-volatile under at the drying temperatures and show a minimum basicity degree with the pK.sub.a being 2.2 or more, developing the water-insoluble azo dyestuffs on the fiber by diazotizing the amines and coupling the diazonium compound formed with the coupling components following the drying of the printing pastes applied by a treatment of the printed fabrics at room temperature with an aqueous developing bath containing formic acid, and completing the coupling without a previous intermediate drying of the fabric, however, optionally following an air passage, by a short-time steaming with saturated steam.