| abstract |
The composition for permanent shaping of hair contains, as keratin-reducing agent, a compound of the formula (I): or a salt thereof, wherein R1, R2, R3 and R4 each represent, independently of each other, H, a straight or branched chain alkyl or hydroxy alkyl group, with 1 to 3 carbon atoms or a carboxyl group, with the proviso that at least one of the R1, R2, R3 and R4 groups is not H, n and m are whole numbers from 1 to 3 and X is a bivalent group -O-, -CR5R6- or -NR7-, in which R5, R6 and R7 are each, independently of each other, H or straight chain or branched chain alkyl groups or hydroxyalkyl groups with 1 to 3 carbon atoms or carboxyl groups. New mercaptoacetamide compounds and methods of making them are also described. The composition for permanent shaping provides a safe and uniform shaping of hair without allergic and sensitizing reactions; it has a skin and hair safe pH range of 6.5 to 9.5. |