PROCESSUS DE DÉFRISAGE ET/OU DE LISSAGE DE FIBRES DE KÉRATINE, UTILISANT UN AGENT RÉDUCTEUR À BASE DE THIOL ET UN DÉRIVÉ D'ACIDE DICARBOXYLIQUE, ET KIT DE LISSAGE
The present invention relates to a process for curl-relaxing and/or straightening keratin fibres, in particular keratin fibres such as the hair, comprising: either: i) the application to said fibres of an acidic composition (A), preferably having a pH of between 1 and 5 inclusive, and containing one or more thiol-based reducing agents in an amount of less than 8% by weight relative to the total weight of the composition (A), ii) the application to said fibres of a distinct composition (B) containing one or more compounds of formula (I): RO-C(O)-ALK-C(O)-OR' in which ALK, R and R' are as defined in the description； or: iii) the application of an acid composition (D) containing: a) one or more thiol-based reducing agents in an amount of less than 8% by weight relative to the total weight of the composition (D)； and b) one or more compounds of formula (I) as defined previously； followed iv) by a step of heat treatment of the fibres by means of a heating tool； it being understood that: - steps i) and ii) may be applied together or separately, preferably together, - steps i) and ii) are followed by heat treatment step iv) or else step iii) is followed by heat treatment step iv). The invention also relates to the use of the composition (A), (B) or (D) for curl-relaxing and/or for straightening keratin fibres, to a composition (D) and to a multi-compartment device or "kit" suitable for carrying out such a process.La présente invention concerne un processus de défrisage et/ou de lissage de fibres de kératine, en particulier des fibres de kératine telles que les cheveux, comprenant : soit : i) l'application sur lesdites fibres d'une composition acide (A), de préférence ayant un pH compris entre 1 et 5 inclus, et contenant un ou plusieurs agents réducteurs à base de thiol dans une quantité inférieure à 8 % en poids par rapport au poids total de la composition (A), ii) l'application sur lesdites fibres d'une composition distincte (B) contenant un ou plusieurs composés de la fo
