Hydroxyl derivatives of benzaldehyde for coloring keratin fibres in the absence of oxidizing agent
AssigneeL'oreal
InventorsGeorges Rosenbaum, Jean F. Grollier, Jean Cotteret
Life of this patent
Estimating the term…
Abstract
The invention discloses the use of hydroxyl derivatives of benzaldehyde for coloring keratin fibres without an oxidizing agent. These derivatives are of the type which correspond to the formula: ##STR1## in which R denotes a linear or branched lower alkyl group which is optionally substituted by one or two OH groups, n is equal to 1, 2 or 3, m is equal to 0, 1 or 2 and the sum n+m is equal to 2 or 3.
Claims17
Process for colouring keratin fibres in the absence of an oxidising agent, which comprises applying thereto at least one composition containing a cosmetically acceptable medium and a dyestuff corresponding to the formula:
- ##STR7## in which R denotes a linear or branched lower alkyl group which is optionally substituted by one or two hydroxyl groups, n is equal to 1, 2 or 3, m is equal to 0, 1 or 2 such that n+m is equal to 2 or 3, with the proviso that (i) if m is equal to 0 (and n is equal to 2 or 3), the OH groups occupy the following positions of the ring:
- ______________________________________ 2 3 4 5 6 ______________________________________ OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH ______________________________________
- and (ii) if m and n both denote 1, the substituents occupy the following positions of the rings:
- ______________________________________ 2 3 4 5 6 ______________________________________ OH OR OR OH OH OR OH OR OH OR OH OCH.sub.2 CH.sub.2 OH (3) OH ##STR8## OH OC.sub.2 H.sub.5 ______________________________________
- or a bisulphite adduct thereof.
Dependencies are inferred from the claim text.