Process for dyeing uniformly polyacrylonitrile fiber materials

US4252535A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Norbert Kollodzeiski · Eppstein, DE
• Rudolf Lowenfeld · Dreieich, DE
• Eberhard Mundlos · Heusenstamm, DE
• Reinhard Mohr · Offenbach am Main, DE
• Kurt Hohmann · Ybbs an der Donau, AT

Key dates

• Filing date: Feb 28, 1979
• Grant date: Feb 24, 1981
• Expiry date: Feb 28, 1999

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S534/01
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A dyeing process has been found which enables to dye uniformly polyacrylonitrile fiber materials, by using as dyestuffs basic azo dyestuffs being non-quarternized and containing neither cationic quaternary ammonium groups nor cationic N-substituted or N-unsubstituted iminium groups, said azo dyestuffs containing on the other hand at least one unsubstituted or substituted amino group, hydrazino group, amidino group or guanidino group capable of forming salts. The very dyeing process as such is carried out according to usual processing data for dyeing polyacrylonitriles in a slightly acid medium. Especially with the use of several of these dyestuffs for polychromic dyeing, such as trichromic dyeing, special advantages are obtained, insofar that even at cut-rate dyeing periods and for preparing light color shades, there are obtained even dyes with constant color shades, when using these dyestuffs having good migrating properties.