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The invention provides a dye composition for dyeing fibres comprising (a) an azo dye of formula (II) or a slat thereof, and (b) an azo dye of formula (III) or a salt thereof. The invention provides navy and black dye compositions, especially suitable for dyeing secondary cellulose acetate fibres, wi...

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Bibliographische Detailangaben
Hauptverfasser:	BUCKLEY, ALAN JOHN, CROWSON, REBECCA JANE, WHITHAM, CHRISTOPHER
Format:	Patent
Sprache:	ger
Schlagworte:	ADHESIVES CHEMISTRY DYEING LEATHER, FURS, OR SOLID MACROMOLECULAR SUBSTANCES INANY FORM DYEING OR PRINTING TEXTILES DYES FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR LAKES LAUNDERING METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS MORDANTS NATURAL RESINS ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES PAINTS POLISHES TEXTILES TREATMENT OF TEXTILES OR THE LIKE
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Beschreibung
Zusammenfassung:	The invention provides a dye composition for dyeing fibres comprising (a) an azo dye of formula (II) or a slat thereof, and (b) an azo dye of formula (III) or a salt thereof. The invention provides navy and black dye compositions, especially suitable for dyeing secondary cellulose acetate fibres, with superior fastness properties than known navy/black dyes. Preferably, the α-crystal form of dye (III) is used, which has greater solubility and achieves quicker dyeing than the commonly-used β and γ forms of (III) when dyeing cellulose acetate at 60-95°C. A new method of making the α form is disclosed.