PROCEDIMIENTO PARA PREPARAR LA MODIFICACION BETA DE COLOR ESTABLE,DE UN COLORANTE MONOAZOICO

PROCEDIMIENTO PARA PREPARAR LA MODIFICACION BETA DE COLOR ESTABLE,DE UN COLORANTE MONOAZOICO

The alpha -modification of the dyestuff of the formula characterised by the X-ray diffraction pattern shown in Figure 2 is unstable under certain dyeing conditions. The invention relates to another modification, the beta -modification, characterised by the X-ray diffraction pattern shown in Figure 1...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: HUBERT KRUSE, KARL SOMMER
Format: Patent
Sprache:spa
Schlagworte:
ADHESIVES
CHEMISTRY
DYES
LAKES
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
MORDANTS
NATURAL RESINS
ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES
PAINTS
POLISHES
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Beschreibung
Zusammenfassung:The alpha -modification of the dyestuff of the formula characterised by the X-ray diffraction pattern shown in Figure 2 is unstable under certain dyeing conditions. The invention relates to another modification, the beta -modification, characterised by the X-ray diffraction pattern shown in Figure 1 which is stable under dyeing conditions and so is suitable for use in dyeing such articles as cross-wound packages. Process for the preparation of the beta - modification from the alpha -modification and dyeing compositions comprising the beta -modification may be prepared by a) heating the alpha -modification in an aqueous suspension to a temperature of 80-130 DEG C; or b) grinding the alpha - modification in the presence of one or more dispersion agents at a temperature of 80-90 DEG C.