Dye compositions comprising at least one hydrophobic direct dye and at least one acid
AssigneeL'oreal
InventorsMaxime De Boni, Alain Lagrange
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Abstract
The present disclosure provides dye compositions comprising at least one hydrophobic direct dye with a logP of greater than 2, at least one organic or mineral acid with a pKa of less than 4.5, in an aqueous-alcoholic dyeing medium comprising at least 60% by weight of water relative to the total weight of the composition, the pH of the composition being less than 7. The compositions allow shades ranging from pastel to strong colorations to be obtained on keratin fibers. Furthermore, the coloration obtained makes it possible to achieve or even exceed the fastness of oxidation dyeing.
Claims31
A dye composition comprising
- at least one hydrophobic direct dye having a logP greater than 2 and
- at least one organic or mineral acid with a pKa of less than 4.5.,
- in an aqueous-alcoholic dyeing medium comprising at least 60% water,
- wherein the pH of the composition is less than 7.
A process for the direct dyeing of keratin fibers, comprising
- applying to the keratin fibers, for a time sufficient to obtain a desired coloration, a dye composition comprising:
- at least one hydrophobic direct dye having a logP greater than 2, and
- at least one organic or mineral acid with a pKa of less than 4.5,
- in an aqueous-alcoholic dyeing medium comprising at least 60% water, wherein the pH of the composition is less than 7.
A process for increasing the color fastness of keratin fibers upon direct dyeing, said process comprising
- applying to the keratin fibers for a time sufficient to obtain a desired coloration, a dye composition comprising:
- at least one hydrophobic direct dye having a logP greater than 2, and
- at least one organic or mineral acid with a pKa of less than 4.5,
- in an aqueous-alcoholic dyeing medium comprising at least 60% water, wherein the pH of the composition is less than 7, and
- wherein the at least one direct dye and the at least one acid are present in the aqueous-alcoholic medium in a combined amount sufficient to give increased color-fastness to the keratin fibers.
Dependencies are inferred from the claim text.