A method for treating keratin substances, the method comprising applying to the keratin substances at least one compound chosen from compounds represented by formula (I), addition salts thereof, or solvates thereof:
- wherein:
- R1, R2, R3, R4 and R5, which may be identical or different, each represent:
- a hydrogen or halogen atom;
- a linear or branched C1-C10 alkyl substituent, optionally substituted by one or more hydroxyl, C1-C10 alkoxy, C1-C4 hydroxyalkyl and —NR7R8 groups;
- a linear or branched C1-C10 alkoxy substituent, optionally substituted by one or more hydroxyl, C1-C10 alkoxy, C1-C4 hydroxyalkyl and —NR7R8 groups;
- or two adjacent substituents R1 and R2, R2 and R3, R3 and R4 and/or R4 and R5 can form together with the carbon atoms to which they are attached a cycloalkyl group including 5 to 10 members or an aryl group including 6 to 10 members, it being understood that said cycloalkyl or aryl group optionally comprises one or more heteroatoms and is optionally substituted by one or more halogen atoms, one or more linear or branched C1-C10 alkyl substituents, one or more linear or branched C1-C10 alkoxy substituents, one or more hydroxyl groups, one or more C1-C4 hydroxyalkyl substituents and one or more —NR7R8 groups;
- ALK represents a linear or branched, saturated or unsaturated C1-C10 alkyl substituent;
- R6 represents:
- a hydrogen or halogen atom,
- a linear or branched, saturated or unsaturated C1-C10 alkyl substituent, optionally interrupted by one or more heteroatoms chosen from oxygen and nitrogen and/or optionally substituted by one or more hydroxyl, C1-C10 alkoxy, C1-C4 hydroxyalkyl and —NR7R8 groups;
- an aryl substituent including 5 to 12 members optionally substituted by one or more halogen atoms, one or more linear or branched C1-C10 alkyl substituents, one or more linear or branched C1-C10 alkoxy substituents, one or more hydroxyl groups, one or more C1-C4 hydroxyalkyl substituents and one or more —NR7R8 groups;
- X represents a heteroatom chosen from an oxygen atom or a sulfur atom, or a —NR11 substituent;
- R7, R8, and R11, which may be identical or different, denote a hydrogen atom or a linear or branched C1-C10 alkyl substituent optionally substituted with one or more hydroxyl or C1-C10 alkoxy, C1-C4 hydroxyalkyl and amino groups;
- wherein one of the substituents R1 or R5 may form a ring with the substituent R6;
- Q− represents an anion or a mixture of organic or inorganic anions that ensure electroneutrality in compounds of formula (I).