A subject of the invention is a process for dyeing keratin fibres such as the hair, using at least one cationic direct dye bearing a disulfide, thiol or protected-thiol function and comprising at least one ammonium group bearing an aliphatic chain (I). Another subject of the invention is the use i) of at least one cationic direct dye bearing a disulfide, thiol or protected-thiol function (I) combined with ii) steam and/or a heating iron for straightening keratin fibres, for dyeing keratin fibres, and novel cationic direct dyes bearing a disulfide, thiol or protected-thiol function (I), and also a cosmetic composition comprising same. The process used and the use of the thiol, protected-thiol or disulfide dyes combined with steam makes it possible in particular to obtain a long-lasting colouration with a care valency on the keratin fibres.
本发明涉及一种用于染色角蛋白纤维(如头发)的方法,该方法使用至少一种带有二
硫化物、巯基或受保护巯基功能的阳离子
直接染料,并包括至少一种带有脂肪链的
铵基(I)。本发明的另一个方面是使用i)至少一种带有二
硫化物、巯基或受保护巯基功能的阳离子
直接染料(I)结合ii)蒸汽和/或加热熨斗来拉直角蛋白纤维,用于染色角蛋白纤维,并且还包括带有相同成分的新型带有二
硫化物、巯基或受保护巯基功能(I)的阳离子
直接染料,以及一种化妆品组合物。使用巯基、受保护巯基或二
硫化物染料结合蒸汽的方法,特别可以获得具有对角蛋白纤维的护理价值的持久着色效果。