Reducing cosmetic composition for perming containing a derivative of a N-(mercapto-alkyl)succinamic acid or a N-(mercapto-alkyl)succinimid and its use in a process for permanent hair shaping

摘要

This composition contains, in a suitable vehicle, a reducing agent having the following general formula: …IMAGE… in which:… n is 2 or 3… A represents a divalent radical chosen from:… (i) -(CH2)m-, m being 2 to 3, …IMAGE… R3 and R4, which may be identical or different, representing an alkyl radical having from 1 to 4 carbon atoms, or R3 and R4, together with the adjacent carbon atoms, form a cyclohexane ring, and …IMAGE… R5 and R6, which may be identical or different, representing a hydrogen atom or an alkyl radical having from 1 to 4 carbon atoms, or R5 and R6, together with the adjacent carbon atoms, form a benzene ring,… R1 represents a hydrogen atom, and… R2 represents a hydroxyl radical, or… R1 and R2, taken together, form a single bond, and the salts with an organic or inorganic base of the abovementioned compounds in free acid form. …??Use of the composition for the first stage of a permanent hair shaping operation.