| abstract |
Cosmetic composition designed to impart to the skin a coloring which is substantially similar to the pigmentation resulting from natural tanning, characterized in that it contains, in a cosmetically acceptable medium suitable for topical application, at least one compound of the formula: <IMAGE> (I) in which R1 denotes a hydrogen atom, a lower alkyl group or a residue -SiR9R10R11, R2 and R3, which may be identical or different, denote a hydrogen atom, a lower alkyl group, a carboxyl group, a lower alkoxycarbonyl group or a group -COOSiR9R10R11; R4 and R5 which may be identical or different, denote a hydrogen atom, a linear or branched C1-C20 alkyl group, a formyl group, a linear or branched C2-C20 acyl group, a linear or branched C3-C20 alkenoyl group, a group R6OSO2-, a group -SiR9R10R11, a group -P(O)(OR6)2 or an aralkyl group, or alternatively R4 and R5, with the oxygen atoms to which they are attached, form a ring optionally containing a carbonyl group when at least one of the groups, R1, R2 or R3 is other than hydrogen or alternatively a thiocarbonyl group, a residue >P(O)OR6, a group >CR7R8 or a methylene group, R6 denoting a hydrogen atom or a lower alkyl group, R7 denoting a hydrogen atom or a lower alkyl group, R8 denoting a lower alkoxy group or a mono- or dialkylamino group and R9, R10 or R11, which may be identical or different, denoting linear or branched lower alkyl groups, at least one of the substituents R1, R2, R3, R4 and R5 being other than hydrogen; and the corresponding salts with alkali metals, alkaline earth metals, ammonium or amines. |