Hoechst Aktiengesellschaft

Horst Curtius

Erich Feess

Willy Gronen

Paul Karacsonyi

Hartmut Springer

Hasso Hertel

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.

Process for the printing of cellulose fiber fabrics

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 subsequent treatment with dry heat and/or high-temperature steam.

Process for the printing of mixed fabrics of polyester and cellulose

Azo developing dyestuffs are produced by diazotizing on the fiber a mono- to tetramine derived from a metal-containing or metal-free phthalocyanine, the amino group(s) being bound to a phenyl or naphthyl group (which may be substituted) which is linked via a bridge member to the phthalocyanine which may further contain up to 3 optionally substituted sulfon amide groups and up to 3 sulfo groups, and coupling said diazotized amino onto azoic coupling components usual for preparing developing dyestuffs.

Process for the preparation of azo dyestuffs on fiber materials

o-Aminophenol ethers deriving from lower alkylene glycols, lower alkylene polyglycols and the corresponding mono-lower alkyl ethers which may be substituted in the phenyl nucleus by halogen or nitro, are useful as diazo components in the 'all-in' printing process for preparing developing dyes on cellulose. In this process the printing paste contains the alkaline solution of the coupling component, a dispersion of the amine, sodium nitrite and a thickening composition and developing of the dye is brought about with acidic means, followed by or combined with a heat treatment.

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Kelkheim, Germany

Horst Curtius