Process for dyeing hydrophobic textile material with disperse dyes from supercritical CO.sub.2 : reducing the pressure in stages

US5250078A · kind A · utility

Assignee

• Ciba-Geigy · US

Inventors

• Wolfgang Saus · Grevenbroich, DE
• Dierk Knittel · Krefeld, DE
• Eckhard Schollmeyer · Kempen, DE
• Hans-Jurgen Buschmann · Krefeld, DE

Key dates

• Filing date: May 12, 1992
• Grant date: Oct 5, 1993
• Expiry date: May 12, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S8/922
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Dyeing polyester textile material with disperse dyes from supercritical CO.sub.2 gives stronger dyeings by carrying out the subsequent pressure reduction in a plurality of steps.