Derivatives of 2,5-dihydroxyphenylcarboxylic acids, and their utilization in cosmetic or dermatological compositions with a depigmenting action

摘要

A cosmetic or dermatological composition with a depigmenting action comprises derivatives of 2,5-dihydroxyphenylcarboxylic acids, their homologs, and their salts, with the derivatives having the following structural formula: (I) wherein: R1 represents OR5, OH, or R5 is a linear or branched C1-C20 alkyl radical, a linear or branched C2-C20 alkenyl radical, or a C1-C20 alkyl radical substituted by one or more hydroxy or alkoxy groups; r' and r'', identical or different, represent a hydrogen atom, a C1-C20 alkyl radical, a C2-C6 hydroxyalkyl radical, or a C3-C6 polyhydroxyalkyl, or r' and r'' taken together, with the nitrogen atom, form a heterocycle; the number of carbon atoms in the -(CH2)n-COR1 chain is less than or equal to 21; R2 and R3, identical or different, represent a hydrogen atom, a linear or branched C1-C4 alkyl radical, or a C1-C4 alkoxy; R4 represents a hydrogen atom or a linear or branched C-C4 alkyl radical; and n is an integer from 0 to 20, provided that, when R2 and R3 represent a hydrogen atom, n is greater than or equal to 2.