Process for the printing of mixed fabrics of polyester and cellulose fibers

US4212646A · 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: D06P3/8228
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Process for printing textile mixed fabrics of polyester and cellulose fibers with printing pastes containing coupling components dissolved in an alkaline medium, sodium nitrite, diazotizable primary aromatic amines and optionally disperse dyestuffs, 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 that they are practically non-volatile at the drying temperatures and exhibit minimum basicity 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 compounds 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 as well as the fixation of azo dyestuffs formed and of optionally employed disperse dyestuffs on the polyester fiber portion without previous intermediate drying, however, optionally after an air passage, either by steaming with high temperature steam or by a fast steaming with saturated steam and s…