Tinctorial composition based on 5,6-dihydroxyindolines and method for dyeing keratinous fibres
AssigneeL'oreal
InventorsAlain Lagrange, Bernadette Luppi, Alex Junino
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Abstract
The invention relates to the use of a 5,6-dihydroxyindoline corresponding to the formula (I): ##STR1## in which R represents a hydrogen atom or a C.sub.1 -C.sub.4 alkyl group, as well as the acid addition salts of these compounds for dyeing keratinous materials, in particular human keratinous materials, and to the tinctorial compositions and methods employed.
Claims29
A tinctorial composition useful for dyeing keratinous fibres, in particular human keratinous fibers, comprising from 0.01 to 8% by weight, relative to the total weight of the composition, of at least one 5,6-dihydroxyindoline corresponding to the formula (I):
- ##STR4## in which R represents a hydrogen atom or a C.sub.1 -C.sub.4 alkyl group, or an acid addition salt thereof in a medium suitable for dyeing.
A multicomponent agent for dyeing keratinous fibres, in particular human keratinous fibres, comprising a first component consisting of a composition (A) containing a 5,6-dihydroxyindoline corresponding to formula (I):
- ##STR5## in which R represents a hydrogen atom or a C.sub.1 -C.sub.4 alkyl group, or an acid addition salt thereof, and a second component consisting of a composition (B) which contains, in a medium appropriate for dyeing, either:
- (a) hydrogen peroxide at a pH of between 2 and 12 when the composition (A) contains iodide ions, or
- (b) iodide ions at a pH of between 3 and 11, when the composition (A) contains hydrogen peroxide.
New compound consisting of 5,6-dihydroxyindoline hydrobromide.
New compounds consisting of N-(C.sub.2 -C.sub.4)alkyl-5,6-dihydroxyindolines and their salts.
Dependencies are inferred from the claim text.