Dyeing cellulose-containing textile material with hydrogenated indigo

US5586992A · kind A · utility

Assignee

• BASF SE

Inventors

• Georg Schnitzer · Bad Dürkheim, DE
• Franz Suetsch · Bad Dürkheim, DE
• Michael Schmitt · Worms, DE
• Erich Kromm · Bad Dürkheim, DE
• Harald Schlueter · Bad Dürkheim, DE
• Rudolf Krueger · Bad Dürkheim, DE
• Andreas Weiper-Idelmann · Waldsee, DE

Key dates

• Filing date: Sep 29, 1995
• Grant date: Dec 24, 1996
• Expiry date: Sep 29, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S8/918
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A process for dyeing celluose-containing textile material with indigo comprises using an aqueous solution of leuco indigo prepared by catalytic hydrogenation and, after the leuco indigo has gone onto the textile material, converting it back into the pigment form in a conventional manner by air oxidation.