Oxidative treatment of hair with reduced hair damage

Abstract

The present invention relates to hair care compositions comprising chelants and methods for reducing oxidative hair damage. The compositions contribute to reducing the oxidative damage sustained by keratinous fibers such as human hair during bleaching, dyeing, perming or other oxidative treatments. The compositions according to the present invention also provide excellent color evenness and color fastness.

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       9 . A composition according to  claim 19 , wherein said composition has a pH from about 8 to about 12.  
   
   
       10 . A composition according to  claim 19 , wherein said composition is in the form of an oil-in-water emulsion.  
   
   
       11 . A composition according to  claim 19 , wherein said composition is in the form of a thickened aqueous solution.  
   
   
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       19 . A composition suitable for treating hair comprising: 
 a) an oxidizing agent; and    b) a chelant (L) having a              log   ⁢           ⁢     K   CuL         log   ⁢           ⁢     K   CaL               ratio calculated at pH 10 of at least about 3.20, wherein log K CuL  is the common logarithm of the Conditional Stability Constant of said chelant with Cu 2+  and log K CaL  is the common logarithm of the Conditional Stability Constant of said chelant with Ca 2+ ;    wherein said chelant is in an amount sufficient to provide a Normalized Shine Ratio of at least about 0.95 as measured by the Goniophotometer Damage Assessing Protocol after a 5-Cycle Hair Oxidative Treatment Protocol With 10 Intermediate Washes.    
   
   
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       21 . A composition according to  claim 19 , wherein said chelant (L) has a Hydrogen Peroxide Decomposition Ratio (% Loss) of less than about 10% as measured by the Hydrogen Peroxide Decomposition Ratio Measurement Protocol.  
   
   
       22 . A composition according to  claim 19 , wherein said chelant (L) is capable of forming a hexadendate complex with Cu 2+ .  
   
   
       23 . A composition according to  claim 19 , wherein said chelant (L) is an aminocarboxylic acid chelant selected from the group consisting of diamine-N,N′-dipolyacids, monoamine monoamide-N,N′-dipolyacids and N,N′-bis(2-hydroxybenzyl)ethylenediamine-N,N′-diacetic acid (HBED), salts thereof, derivatives thereof and mixtures thereof.  
   
   
       24 . A composition according to  claim 23 , wherein said aminocarboxylic acid chelant comprises at least two acid groups independently selected from a carboxylic acid group (—COOH), a sulphonic group (—SO 3 H), an o-hydroxyphenyl group, the m-hydroxyphenyl group, and a p-hydroxyphenyl group.  
   
   
       25 . A composition according to  claim 24 , wherein said aminocarboxylic acid chelant is selected from the group consisting of ethylenediamine-N,N′-disuccinic acid (EDDS), ethylenediamine-N,N′-diglutaric acid (EDDG), 2-hydroxypropylenediamine-N,N′-disuccinic acid (HPDDS), glycinamide-N,N′-disuccinic acid (GADS), ethylenediamine-N-N′-bis(ortho-hydroxyphenyl acetic acid) (EDDHA), and salts thereof, derivatives thereof and mixtures thereof.  
   
   
       26 . A composition according to  claim 19 , wherein said oxidizing agent is present at a level of from about 0.1% to about 40% by weight of the composition and is selected from water-soluble oxidizing agents and mixtures thereof.  
   
   
       27 . A composition according to  claim 19 , further comprising at least one oxidative hair dye precursor.  
   
   
       28 . A method of treating hair, said method comprising the steps of: 
 i) applying a first composition comprising an oxidizing agent;    ii) applying a second composition comprising a chelant (L) having a              log   ⁢           ⁢     K   CuL         log   ⁢           ⁢     K   CaL               ratio calculated at pH 10 of at least about 3.20, wherein log K CUL  is the common logarithm of the Conditional Stability Constant of said chelant with Cu 2+  and log K CaL  is the common logarithm of the Conditional Stability Constant of said chelant with Ca 2+ ; 
 wherein said chelant is in an amount sufficient to provide a Normalized Shine Ratio of at least about 0.95 as measured by the Goniophotometer Damage Assessing Protocol after a 5-Cycle Hair Oxidative Treatment Protocol With 10 Intermediate Washes; and  
   iii) applying a third composition comprising a second oxidizing agent; and    wherein steps i) and iii) are separated by at least 1 day and step ii) does not take place immediately before step iii).    
   
   
       29 . A kit for dyeing hair comprising a first and a second compositions packaged in different containers, wherein said first composition comprises an oxidizing agent and said second composition comprises an oxidative dye precursor, wherein the resulting mixture of said first and second compositions is a composition according to  claim 27 .  
   
   
       30 . A method of dyeing human hair, said method comprising the steps of: 
 i) mixing the first and second composition of a kit according to  claim 29;     ii) applying the mixture obtained after step i) to hair;    iii) massaging said mixture into hair;    iv) retaining said mixture on the hair for an amount of time sufficient for mixture to dye the hair;    iv) rinsing off said composition with water.    
   
   
       31 . A method of treating hair, said method comprising the steps of: 
 i) applying to the hair a first composition comprising a chelant (L) having a              log   ⁢           ⁢     K   CuL         log   ⁢           ⁢     K   CaL               ratio calculated at pH 10 of at least about 3.20, wherein log K CuL  is the common logarithm of the Conditional Stability Constant of said chelant with Cu 2+  and log K CaL  is the common logarithm of the Conditional Stability Constant of said chelant with Ca 2+ ;    wherein said chelant is in an amount sufficient to provide a Normalized Shine Ratio of at least about 0.95 as measured by the Goniophotometer Damage Assessing Protocol after a 5-Cycle Hair Oxidative Treatment Protocol With 10 Intermediate Washes; and    ii) applying to the hair a second composition comprising an oxidizing agent;    wherein step i) takes place before step ii).    
   
   
       32 . A method of treating hair according to  claim 31 , wherein step i) takes place immediately before step ii).  
   
   
       33 . A method of treating hair according to  claim 31 , wherein said first composition is not rinsed off the hair before said second composition is applied to the hair.  
   
   
       34 . A kit for treating hair comprising: 
 i) a first separately packaged composition comprising a chelant (L) having a              log   ⁢           ⁢     K   CuL         log   ⁢           ⁢     K   CaL               ratio calculated at pH 10 of at least about 3.20, wherein log K CuL  is the common logarithm of the Conditional Stability Constant of said chelant with Cu 2+  and log K CaL  is the common logarithm of the Conditional Stability Constant of said chelant with Ca 2+ ; 
 wherein said chelant is in an amount sufficient to provide a Normalized Shine Ratio of at least about 0.95 as measured by the Goniophotometer Damage Assessing Protocol after a 5-Cycle Hair Oxidative Treatment Protocol With 10 Intermediate Washes; and  
   ii) a second separately packaged composition comprising an oxidizing agent.