The present invention relates to a process for stripping keratin fibres, and in particular human keratin fibres such as the hair, dyed with oxidation dyes and/or direct dyes, using a composition obtained by extemporaneous mixing of an anhydrous or aqueous composition (A) comprising at least one suitably selected sulfinic acid derivative and an aqueous composition (B) with a pH of less than 5, comprising at least one organic acid other than the compounds of formula (I), with a pKa of less than or equal to 4 when the composition (A) is aqueous, the pH of the mixture of the two compositions (A) and (B) being less than or equal to 5.
The invention also relates to a composition for stripping the artificial colour from keratin fibres, comprising at least one suitably selected sulfinic acid derivative and at least one thickener chosen from anionic polymers and nonionic polymers.
The compositions used in the context of the invention afford efficient stripping, especially in terms of power, of the artificial colour of keratin fibres dyed with a wide range of oxidation dyes and/or direct dyes. They do not induce lightening of the natural base of the keratin fibres and limit the sensitization of the keratin fibres. They apply well to the hair, uniformly, which makes it possible to obtain regular stripping of the colour along the entire fibre.
本发明涉及一种用于剥离被氧化
染料和/或
直接染料染色的角蛋白纤维,特别是人类角蛋白纤维(如头发)的工艺,该工艺使用的组合物是由一种无
水或
水性组合物(A)和一种
水性组合物(B)临时混合而得,无
水或
水性组合物(A)包含至少一种经适当选择的
亚硫酸衍
生物,
水性组合物(B)的 pH 值小于 5、包含至少一种除式(I)化合物以外的有机酸,当组合物(A)为
水性时,其 pKa 小于或等于 4,两种组合物(A)和(B)的混合物的 pH 值小于或等于 5。
本发明还涉及一种用于从角蛋白纤维中剥离人造色素的组合物,该组合物包含至少一种经适当选择的
亚硫酸衍
生物和至少一种从阴离子聚合物和非离子聚合物中选择的
增稠剂。
本发明中使用的组合物可以有效地去除用多种氧化
染料和/或
直接染料染色的角蛋白纤维的人工色素,尤其是在强力方面。它们不会导致角蛋白纤维的天然基底变浅,并限制角蛋白纤维的敏化。它们能均匀地涂抹在头发上,从而使整个纤维上的颜色得到有规律的剥离。