Patent ID: 7144572

Claim:
A method for permanent-shaping or straightening keratin fibres, comprising applying a cosmetic composition to the keratin fibers, the composition comprising a combination of a keratin-treating effective amount of a compound derived from polyguanidine of formula (I): in which: X, R 1, R 2, R 3 , independently of each other, are a hydrogen atom, a hydroxyl radical or a linear or branched, saturated or unsaturated, optionally hydroxylated C 1 to C 16 alkyl radical, Y denotes a radical NHR, in which R is a hydrogen atom, a hydroxyl radical or a linear or branched, saturated or unsaturated, optionally hydroxylated C 1 to C 16 alkyl radical, A denotes a linear or branched, saturated or unsaturated, C 1 to C 16 alkylene radical optionally substituted with at least one radical which is a hydroxyl, carboxyl or carboxylate radical or a halogen, the alkylene radical optionally containing at least one amine, ether, thioether, ester, amide, carbamate or urea function, a C 6 aryl or C 3 to C 8 cyclanyl ring optionally substituted with a C 1 –C 8 alkyl, hydroxyl or halogen; or A denotes one or more C 6 or C 7 aryl or C 5 to C 7 cyclanyl rings unsubstituted or substituted with a C 1 –C 8 alkyl, a hydroxyl group or a halogen; or A denotes a C 10 to C 14 polyaryl or C 6 to C 10 polycyclanyl chain, which may be interrupted with at least one C 1 to C 8 alkylene radical, an amine, amide, ether, thioether, a hydrogen atom, carbamate or urea function; n is an integer between 2 and 5000, or a physiologically acceptable salt thereof, and a keratin-reducing compound or keratin-fixing compound.