Dyeing-stable monoazo dyestuff, a process for its preparation, and its use

US4460375A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Karl Sommer · Palzing, DE
• Manfred Schneider · Lichtenfels, DE
• Rudolf Schickfluss

Key dates

• Filing date: Nov 14, 1983
• Grant date: Jul 17, 1984
• Expiry date: Nov 14, 2003

Classification

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

Abstract

A dyeing-stable modification (.beta.-modification) of the dyestuff of the formula (I) ##STR1## which has the X-ray diffraction diagram shown in FIG. 1 and having the characteristic reflections at the following glancing angles and relative intensities: ______________________________________ [.theta.] 2.74 4.27 4.70 5.50 8.74 11.24 12.44 relative 100 72 40 23 27 32 26 intensity ______________________________________ a process for its preparation by heating the dyestuff of said formula (I) of the dyeing-unstable .alpha.-modification, characterized by an X-ray diffraction diagram having the characteristic reflections at the following glancing angles and relative intensities ______________________________________ [.theta.] 3.55 4.15 5.35 9.45 10.41 12.71 13.89 relative 42 100 35 24 34 94 48 intensity ______________________________________ at temperatures of 60.degree. to 120.degree. C. in an organic solvent, and its use for dyeing fiber materials made of cellulose esters or synthetic linear polyesters.