A hair relaxer includes at least one specific mercapto compound such as 2-methoxyethyl 3-mercaptopropionate, 2-mercapto-4-butanolide and 2-mercapto-4-butyrolactam. The hair relaxer can achieve an excellent effect of shaping and relaxing hair over a wide range of pH values from weak acidity to weak alkalinity. In particular, the hair relaxer displays a more superior hair shaping and relaxing performance in a weakly acidic to neutral pH range. Consequently, the hair relaxer can drastically reduce the damage to the hair and skin and can reliably perform straightening, uncurling, curling and other hair processing.
[EN] A hair relaxer includes at least one specific mercapto compound such as 2-methoxyethyl 3-mercaptopropionate, 2-mercapto-4-butanolide and 2-mercapto-4-butyrolactam. The hair relaxer can achieve an excellent effect of shaping and relaxing hair over a wide range of pH values from weak acidity to weak alkalinity. In particular, the hair relaxer displays a more superior hair shaping and relaxing performance in a weakly acidic to neutral pH range. Consequently, the hair relaxer can drastically reduce the damage to the hair and skin and can reliably perform straightening, uncurling, curling and other hair processing. [FR] L'invention porte sur un défrisant comprenant au moins un composé mercapto spécifique tel que le 2-méthoxyéthyl 3-mercaptopropionate, le 2-mercapto-4-butanolide et le 2-mercapto-4-butyrolactam. Ledit défrisant a un excellent effet de mise en forme et de défrisage pour une large plage de pH allant d'une faible acidité à une faible alcalinité, lesdites capacités s'avérant encore meilleures pour la plage allant d'un pH de faible acidité à un pH neutre. Par conséquent ledit défrisant réduit considérablement les dommages à la peau et aux cheveux, et peut de plus assurer fiablement le raidissement, le frisage, le défrisage et autres traitements du cheveu.
Asinger,F. et al., Justus Liebigs Annalen der Chemie, 1960, vol. 634, p. 144 - 163