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US 5,879,413 AGranted
Cationic diazo dyes for the dyeing of hair
AssigneeWarner-Jenkinson Europe Limited
InventorsRoger W. Pengilly, Francis C. P. McLoughlin, Roger G. J. C. Twigg
Life of this patent
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Abstract
Diazo dyes of the general formula (I) ##STR1## are described where X.sup.+ is a quaternary ammonium group and Y.sup.- is a counterbalancing anion. The dyes are useful for coloring hair.
Claims15
Diazo dyes of the general formula (I) ##STR6## where X.sup.+ is a quaternary ammonium group and Y.sup.- is a counterbalancing anion.
A dye of the general formula IV ##STR7##
Dependencies are inferred from the claim text.