Process for relaxing keratin fibres

Abstract

The invention relates to a process for relaxing keratin fibres by applying to the keratin fibres a relaxing composition containing at least one denaturing agent with a molecular mass of greater than 18.1 g/mol, present in a molar concentration of between 1M and 8M, and raising the temperature of the keratin fibres to a temperature of between 110 and 250° C.

1 . A process for relaxing keratin fibres comprising: 
 (i) applying to the keratin fibres a relaxing composition comprising at least one denaturing agent with a molecular mass of greater than 18.1 g/mol, present in a molar concentration of between 1M and 8M, to provide treated keratin fibers, and    (ii) raising the temperature of the treated keratin fibres to a temperature of between 110 and 250° C.    
   
   
       2 . The process according to  claim 1 , wherein the relaxing composition comprises between 2M and 8M of the said denaturing agent.  
   
   
       3 . The process according to  claim 1 , wherein the temperature is raised to a temperature of between 120° C. and 220° C.  
   
   
       4 . The process according to  claim 1 , wherein the molar mass of the denaturing agent is between 40 and 600 g/mol.  
   
   
       5 . The process according to  claim 1 , wherein the composition is applied to wet keratin fibres.  
   
   
       6 . The process according to  claim 1 , wherein the treated fibres are partially predried prior to raising the temperature of the treated keratin fibres.  
   
   
       7 . The process according to  claim 1 , wherein the relaxing composition comprises at least one protein-denaturing agent selected from ureas, guanidines, aromatic monohydroxylated, dihydroxylated, trihydroxylated or polyhydroxylated derivatives, carboxylic acids and derivatives thereof, amino acids, alcohols, amine oxides, surfactants containing sugar, choline, deoxycholine or polyethylene glycol units, metal salts and sulfamides.  
   
   
       8 . The process according to  claim 1 , wherein the composition comprises urea.  
   
   
       9 . The process according to  claim 1 , wherein the composition comprises at least one compound that corresponds to formula (I):  
     
       
         
         
             
             
         
       
       in which:  
       R1, R2, R3 and R4 represent, independently:  
       (v) a hydrogen atom, or  
       (vi) a linear or branched lower C1-C4 alkyl or alkenyl radical, optionally substituted with a radical chosen from: hydroxyl, amino, dimethylamino, carboxyl or carboxamide or N-methylcarboxamide  
       when R1, R2 and R3 represent a hydrogen atom, R4 may also denote a radical chosen from the following: carboxamide; methoxy; ethoxy; 1,2,4-tri-azolyl; cyclopentyl; methoxycarbonyl; ethoxycarbonyl; CO—CH═CH—COOH; phenyl optionally substituted with a chlorine atom or a hydroxyl radical; benzyl; or 2,5-dioxo-4-imidazolidinyl  
       when R1 and R3 represent a hydrogen atom, R2 may also represent a hydrogen atom or a methyl or ethyl radical and R4 an acetyl radical  
       when R1=R2=H, R3 and R4 may also form, with the nitrogen atom that bears them, a piperidine or 3-methylpyrazole or 3,5-dimethylpyrazole or maleimide ring  
       R1 and R2, and also R3 and R4, may also form, with the nitrogen atom that bears them, an imidazole ring.  
     
   
   
       10 . The process according to  claim 1 , wherein the composition comprises at least one compound that corresponds to formula (II):  
     
       
         
         
             
             
         
       
       in which:  
       R5 and R6 represent, independently of each other:  
       (iii) a hydrogen atom, or  
       (iv) a linear or branched C1-C4 lower alkyl radical, optionally substituted with a radical chosen from: hydroxyl, amino, dimethylamino, carboxyl or carboxamide,  
       and A represents the radicals: CH2-CH2 or CH═CH or CH2-CO or CO—NH or CH═N or CO—CO or CHOH—CHOH or (HOOC)CH—CH or CHOH—CO or CH2-CH2-CH2 or CH2-NH—CO or CH═C(CH3)—CO or NH—CO—NH or CH2-CH2-CO or CH2-N(CH3)—CH2 or NH—CH2-NH or CO—CH(CH3)—CH2 or CO—CH2-CO or CO—NH—CO or CO—CH(COOH)—CH2 or CO—CH═C(COOH) or CO—CH═C(CH3) or CO—C(NH2)═CH or CO—C(CH3)═N or CO—CH═CH or CO—CH═N or CO—N═CH.  
     
   
   
       11 . The process according to  claim 1 , wherein the composition comprises at least one compound chosen from: 
 urea    methylurea    ethylurea    propylurea    isopropylurea    n-butylurea    sec-butylurea    isobutylurea    tert-butylurea    cyclopentylurea    1-ethoxyurea    2-hydroxyethylurea    N-(2-hydroxypropyl)urea    N-(3-hydroxypropyl)urea    N-(2-dimethylaminopropyl)urea    N-(3-dimethylaminopropyl)urea    1-(3-hydroxyphenyl)urea    benzylurea    N-carbamoylmaleimide    biuret    N-carbamoylmaleamic acid    1-piperidinecarboxamide    1,2,4-triazol-4-ylurea    hydantoic acid    methyl allophanate    ethyl allophanate    acetylurea    2-hydroxyethyleneurea    2-(hydroxyethyl)ethyleneurea    N-allyl-N′-ethylurea    diallylurea    2-chloroethylurea    N,N-dimethylurea    N,N-diethylurea    N,N-dipropylurea    1-cyclopentyl-1-methylurea    1,3-dimethylurea    1,3-diethylurea    1,3-bis(2-hydroxyethyl)urea    1,3-bis(2-hydroxypropyl)urea    1,3-bis(3-hydroxypropyl)urea    1,3-dipropylurea    1-ethyl-3-propylurea    1-sec-butyl-3-methylurea    1-isobutyl-3-methylurea    1-cyclopentyl-3-methylurea    N-acetyl-N′-methylurea    trimethylurea    1-butyl-3,3-dimethylurea    tetramethylurea and    benzylurea.    
   
   
       12 . The process according to  claim 1 , wherein the composition comprises at least one compound chosen from: 
 parabanic acid    1,2-dihydro-3-H-1,2,4-triazol-2-one    barbituric acid    uracil    1-methyluracil    3-methyluracil    5-methyluracil    1,3-dimethyluracil    5-azauracil    6-azauracil    5-fluorouracil    6-fluorouracil    1,3-dimethyl-5-fluorouracil    5-aminouracil    6-aminouracil    6-amino-1-methyluracil    6-amino-1,3-dimethyluracil    4-chlorouracil    5-chlorouracil    5,6-dihydrouracil    5,6-dihydro-5-methyluracil    2-imidazolidone hydrate    1-methyl-2-imidazolidinone    1,3-dimethyl-2-imidazolidinone    4,5-dihydroxyimidazolidin-2-one    1-(2-hydroxyethyl)-2-imidazolidinone    1-(2-hydroxypropyl)-2-imidazolidinone    1-(3-hydroxypropyl)-2-imidazolidinone    4,5-dihydroxy-1,3-dimethylimidazolidin-2-one    1,3-bis(2-hydroxyethyl)-2-imidazolidinone    2-imidazolidone-4-carboxylic acid    1-(2-aminoethyl)-2-imidazole    4-methyl-1,2,4-triazoline-3,5-dione    2,4-dihydroxy-6-methylpyrimidine    1-amino-4,5-dihydro-1H-tetrazol-5-one    hydantoin    1-methylhydantoin    5-methylhydantoin    5,5-dimethylhydantoin    5-ethylhydantoin    5-n-propylhydantoin    5-ethyl-5-methylhydantoin    5-hydroxy-5-methylhydantoin    5-hydroxymethylhydantoin    1-allylhydantoin    1-aminohydantoin    hydantoin 5-acetic acid    4-amino-1,2,4-triazolone-3,5-dione    hexahydro-1,2,4,5-tetrazine-3,6-dione    5-methyl-1,3,5-triazinon-2-one    1-methyltetrahydropyrimidin-2-one    2,4-dioxohexahydro-1,3,5-triazine    urazole    4-methylurazole    orotic acid    dihydroxyorotic acid    2,4,5-trihydroxypyrimidine    2-hydroxy-4-methylpyrimidine    4,5-diamino-2,6-dihydroxypyrimidine    barbituric acid    1,3-dimethylbarbituric acid    cyanuric acid    1-methylhexahydropyrimidine-2,4-dione    1,3-dimethyl-3,4,5,6-tetrahydro-2-1H-pyrimidinone    5-(hydroxymethyl-2,4-(1H,3H)-pyrimidinedione    2,4-dihydroxypyrimidine-5-carboxylic acid    6-azathymine    5-methyl-1,3,5-triazinan-2-one    N-carbamoylmaleamic acid and    alloxan monohydrate.    
   
   
       13 . The process according to  claim 1 , wherein the composition comprises at least one compound that corresponds to formula (III) below:  
     
       
         
         
             
             
         
       
       in which:  
       R1, R2, R3, R4 and R5 represent, independently:  
       (vii) a hydrogen atom, or  
       (viii) a linear or branched C1-C4 lower alkyl or alkenyl radical, optionally substituted with one or two radicals chosen from: hydroxyl, amino, dimethylamino, methoxy, ethoxy, carboxyl, carboxamide, N-methylcarboxamide or SO 3 H  
       when R1, R2, R3 and R4 represent a hydrogen atom, R5 may also denote a radical chosen from the following: acetyl; chloroacetyl; carboxamide; methoxy; ethoxy; 1,2,4-triazolyl; cyclopentyl; methoxycarbonyl; ethoxycarbonyl; CO—CH═CH—COOH; phenyl optionally substituted with a chlorine atom or a hydroxyl radical; benzyl; thiazolidone; benzimidazole; benzoxazole; benzothiazole; or C(═NH)—NR6R7 in which R6 and R7 denote, independently of each other, a hydrogen atom or a linear or branched C1-C4 lower alkyl radical, optionally substituted with one or 2 radicals chosen from: hydroxyl, amino, dimethylamino, carboxyl and carboxamide; or N-methylcarboxamide; or alternatively a phenyl radical  
       when R1=R2=R3=H, R4 and R5 may also form, with the nitrogen atom that bears them, a pyrrolidine, piperidine, pyrazole or 1,2,4-triazole ring, optionally substituted with 1 or 2 radicals chosen from: hydroxyl, amino and carboxyl  
       when R1=R2=H, and R4=H or methyl, R3 and R5 may also together form a 5-membered ring optionally containing an oxo group  
       and the organic or mineral salts thereof.  
     
   
   
       14 . The process according to  claim 1 , wherein the composition comprises at least one compound chosen from: 
 guanidine hydrochloride    guanidine acetate    guanidine sulfate    guanidine carbonate    guanidine bicarbonate    guanidine phosphate    guanidine sulfamate    aminoguanidine    aminoguanidine hydrochloride    aminoguanidine sulfate    aminoguanidine bicarbonate    1,3-diaminoguanidine hydrochloride    1-acetylguanidine    chloroacetylguanidine hydrochloride    guanylurea    guanylurea phosphate    phenylguanidine carbonate    phenylguanidine bicarbonate    1-methylguanidine hydrochloride    1,1-dimethylguanidine hydrochloride    1-ethylguanidine hydrochloride    1,1-diethylguanidine hydrochloride    creatine    creatine monohydrate    creatinine hydrochloride    agmatine    agmatine sulfate    guanidinoacetic acid    guanidinosuccinic acid    3-guanidinopropionic acid    4-guanidinobutyric acid    5-guanidinovaleric acid    beta-N-methylguanidinopropionic acid    N-methylguanidinopropionic acid    N-(2-hydroxyethyl)guanidine    N-(3-hydroxypropyl)guanidine    biguanide hydrochloride    N-methylbiguanide hydrochloride    N-ethylbiguanide hydrochloride    N-propylbiguanide hydrochloride    N-butylbiguanide hydrochloride    1,1-dimethylbiguanide hydrochloride    1-phenylbiguanide    1,1,3,3-tetramethylguanidine hydrochloride    2-tert-butyl-1,1,3,3-tetramethylguanidine hydrochloride    L-arginine    D-arginine    DL-arginine    arginic acid    N-amidino-N-(2,3-dihydroxypropyl)glycine    N-amidinotaurine    2-imino-1-imidazolidineacetic acid    1-(2,2-diethoxyethyl)guanidine    1H-pyrazole-1-carboxamidine hydrochloride    5-hydroxy-3-methyl-1H-pyrazole-1-carboximidamide    3,5-diamino-1H-1,2,4-triazole-1-carboximidamide hydrochloride    2-guanidone-4-thiazolidone    2-guanidinobenzimidazole    2-guanidinobenzoxazole    2-guanidinobenzothiazole and    pyrrolidinoformamidine hydrochloride.    
   
   
       15 . The process according to  claim 1 , wherein the temperature of the treated keratin fibres is raised to a temperature of between 110 and 250° C. with a heater.  
   
   
       16 . The process according to  claim 1 , wherein the temperature of the treated keratin fibres is raised to a temperature of between 110 and 250° C. with a heating means.  
   
   
       17 . The process according to  claim 15 , wherein the temperature of the treated keratin fibres is raised to a temperature of between 110 and 250° C. with an iron.  
   
   
       18 . The process according to  claim 1 , wherein said composition is in the form of an aqueous solution or in the form of a thickened cream.  
   
   
       19 . A process comprising raising the temperature of keratin fibres to a temperature of between 110 and 250° C., wherein said keratin fibres comprise on at least a part of a surface thereof at least one denaturing agent with a molecular mass of greater than 18.1 g/mol.  
   
   
       20 . The process according to  claim 19 , wherein the temperature of the keratin fibres is raised to a temperature of between 110 and 250° C. with an iron.