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US 5,961,664 AGranted
Direct hair dye compositions and methods containing novel anthraquinone mixtures
AssigneeBristol-Myers Squibb Company
InventorJames S. Anderson
Life of this patent
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Abstract
An anthraquinone mixture comprising three 1,4-hydroxyalkylamino-anthraquinone derivatives, wherein two of the anthraquinone compounds in the mixture are symmetric and the other anthraquinone compound is asymmetric, and wherein each of the anthraquinone compounds has similar polarities. The anthraquinone mixtures are used in compositions and methods for the direct dyeing of keratinous fibers, particularly human hair on the head.
Claims11
An anthraquinone mixture comprising three different anthraquinone compounds, said compounds having the formula:
- ##STR5## wherein R.sub.1 and R.sub.2 are, independently, monohydroxy C.sub.2 -C.sub.6 alkyl, straight chain or branched chain, with the proviso that in two of the anthraquinones, R.sub.1 and R.sub.2 are the same, and as a consequence, such anthraquinones are symmetric, and in the third of the anthraquinones, R.sub.1 and R.sub.2 differ, and as a consequence, such an anthraquinone is asymmetric;
- wherein said two symmetric anthraquinone compounds in combination are present in said mixture in an amount of about 30% to about 90% by weight, based on the total weight of the mixture;
- and wherein said asymmetric anthraquinone is present in said mixture in an amount of about 10% to about 70% by weight, based on the total weight of the mixture.
Dependencies are inferred from the claim text.