Use of a polyguanidine compound for treating or shaping the hair, especially for straightening or permanent-waving it

Abstract

The present invention relates to the use of a cosmetic composition containing compounds derived from polyguanidines or physiologically acceptable salts thereof for the protection of keratin fibres during permanent-shaping treatments or hair-straightening operations. The invention also relates to a cosmetic treatment process for permanently shaping or straightening keratin fibres, such that it consists in applying to these fibres a composition containing a compound derived from polyguanidines.

1 - 14 . (canceled)  
   
   
       15 . A cosmetic composition, comprising the combination of a compound derived from polyguanidine of formula (I):  
     
       
         
         
             
             
         
       
       in which:  
       X, R 1 , R 2  and 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 5 000, or a physiologically acceptable salt thereof,  
       and a keratin-reducing compound or keratin-fixing compound.  
     
   
   
       16 . The cosmetic composition of  claim 15 , wherein the optionally hydroxylated C 1  to C 16  alkyl radicals in the definition of X 1 , R 1 , R 2 , R 3  and Y are C 1  to C 8  alkyl radicals.  
   
   
       17 . The cosmetic composition of  claim 15 , wherein the C 1  to C 16  alkylene radical in the definition of A is a C 1  to C 12  alkylene radical.  
   
   
       18 . The cosmetic composition of  claim 15 , wherein the amide in the definition of A is —CONR— or —NRCO— in which R is hydrogen or a C 1  to C 8  alkyl radical.  
   
   
       19 . The cosmetic composition of  claim 15 , wherein n is an integer between 2 and 200.  
   
   
       20 . The cosmetic composition of  claim 15 , wherein the compound derived from polyguanidine is a polytetramethyleneguanidinium or polyhexamethyleneguanidinium salt.  
   
   
       21 . The cosmetic composition of  claim 20 , wherein the polytetramethylene-guanidinium and polyhexamethyleneguanidinium salt is a halide, carboxylate or ampholytic internal salt with a guanidinium group in the chain.  
   
   
       22 . The cosmetic composition according to  claim 21 , wherein the halide is a fluoride, chloride or bromide and the carboxylate is a gluconate, acetate or lactate.  
   
   
       23 . The cosmetic composition according to  claim 21 , wherein the compound derived from polyguanidine is polyhexamethyleneguanidinium chloride, polytetramethyleneguanidinium chloride or polytetramethyleneguanidinium acetate.  
   
   
       24 . The cosmetic composition according to  claim 15 , wherein the keratin-reducing compound is a sulphite or bisulphite.  
   
   
       25 . The cosmetic composition according to  claim 24 , wherein the reducing compound is a thiol, cysteamine or its derivatives, thiolactic acid or its esters, or thioglycolic acid or its esters.  
   
   
       26 . The cosmetic composition according to  claim 25 , wherein the thiol is cysteine or its derivatives.