Process for dyeing and printing synthetic, hydrophobic fibre material with dischargeable azo disperse dye

US4406661A · kind A · utility

Assignee

• Cassella Aktiengesellschaft · DE

Inventors

• Ulrich Buhler · Alzenau, DE
• Joachim Ribka · Offenbach am Main, DE
• Horst Tappe · Dietzenbach, DE
• Kurt Roth · Waterloo, CA

Key dates

• Filing date: Jun 10, 1982
• Grant date: Sep 27, 1983
• Expiry date: Jun 10, 2002

Classification

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

Abstract

Azo dyestuffs free from groups imparting solubility in water are used in the process for the production of white or variously colored designs on a colored substrate on textile materials containing hydrophobic, synthetic fibers by impregnating the materials with dye liquors containing dyeing auxiliaries and padding auxiliaries as well as dyestuffs which are dischargeable to white, drying or incipiently drying the impregnated materials, printing the materials with an alkaline discharge reserve paste which contains a discharging agent, and subsequently subjecting the materials to a heat treatment at temperatures from 100.degree. to 230.degree. C., wherein said discharging agent is a base which produces a pH value of at least 8 in a 5% strength aqueous solution and the dyestuffs which are dischargeable to white are of the formula EQU D--N.dbd.N--K--NHSO.sub.2 R wherein PA0 D is 6-nitrobenzthiazol-2-yl, 5-nitrobenzisothiazol-3-yl, a substituted phenyl, a substituted thiazole or a substituted thiophene moiety; PA0 K is a coupling component of the 1,4-phenylene, 1,4-naphthylene, 2,5-thiazolyl or 2,5-thienyl series; and PA0 R is alkyl, substituted alkyl, alkenyl, substituted alkenyl, pheny…