Method of treating hair

Abstract

A hair treatment process comprises the following steps A or B, and includes conducting shaping of hair in at least one of the steps: Steps A: A first pack with a reducing agent contained therein and a second pack with an oxidizing agent contained therein, said second pack having buffer capacity and a pH of from 1 to 5, are successively applied to the hair, and the hair is rinsed with water and is dried (the first pack or the second pack contains an organic acid (A) or a salt thereof), Steps B: A first pack with a reducing agent contained therein, an intermediate treatment having buffer capacity and a pH of from 1 to 5, and a second pack with an oxidizing agent contained therein are successively applied to the hair, and the hair is rinsed with water and is dried (the first pack or the intermediate treatment contains the organic acid (A) or salt thereof), Organic acid (A): a compound comprising a non-aromatic hydrophobic group having a total carbon number of from 3 to 11 or an aromatic hydrophobic group having a total carbon number of from 4 to 18 and an acidic group such as a sulfo group, sulfate ester group or the like. By a procedure as simple as conventional straight perm, an extremely high, extremely curly hair correcting effect can be obtained. Further, subsequent to the treatment, the corrected state can be restored or maintained by a routine aftercare without damaging the hair.

1 . A hair treatment process comprising the following steps (1-1) to (1-4) in at least one of which shaping of hair is conducted with optional use of a heating device as needed, and at least one of a first pack and a second pack comprising the following organic acid (A) or a salt thereof: 
 Steps: 
 (1-1) applying said first pack, which comprises a hair keratin reducing substance, to said hair, and after allowing said hair to stand for 1 to 120 minutes,  
 (1-2) rinsing said hair with water as needed,  
 (1-3) applying said second pack, which comprises an oxidizing agent, has buffer capacity and has a pH of from 1 to 5, to said hair, and after allowing said hair to stand for 1 to 60 minutes,  
 (1-4) rinsing said hair with water, and drying said hair.  
   Organic acid (A): a compound comprising a non-aromatic hydrophobic group having a total carbon number of from 3 to 11 or an aromatic hydrophobic group having a total carbon number of from 4 to 18 and an acidic group selected from a sulfo group, sulfate ester group, sulfino group, sulfeno group, phosphono group, phosphate ester group or phosphinico group.    
     
     
         2 . A hair treatment process comprising the following steps (2-1) to (2-5) in at least one of which shaping of hair is conducted with optional use of a heating device as needed, and at least one of a first pack and an intermediate treatment comprising the following organic acid (A) or a salt thereof: 
 Steps: 
 (2-1) applying said first pack, which comprises a hair keratin reducing substance, to said hair, and after allowing said hair to stand for 1 to 120 minutes,  
 (2-2) applying said intermediate treatment, which has buffer capacity and has a pH of from 1 to 5, to said hair,  
 (2-3) rinsing said hair with water as needed,  
 (2-4) applying a second pack, which comprises an oxidizing agent, to said hair, and after allowing said hair to stand for 1 to 60 minutes,  
 (2-5) rinsing said hair with water, and drying said hair.  
   Organic acid (A): a compound comprising a non-aromatic hydrophobic group having a total carbon number of from 3 to 11 or an aromatic hydrophobic group having a total carbon number of from 4 to 18 and an acidic group selected from a sulfo group, sulfate ester group., sulfino group, sulfeno group, phosphono group, phosphate ester group or phosphinico group.    
     
     
         3 . A hair treatment process according to  claim 2 , wherein said second pack comprises said organic acid (A) or salt thereof, has buffer capacity, and has a pH of from 1 to 5.  
     
     
         4 . A hair treatment process comprising applying an after-treatment, which comprises said organic acid (A) or salt thereof, has buffer capacity and has a pH of from 1 to 5, to said hair treated by the process described in any one of claims  1 - 3 , allowing said hair to stand for 1 to 120 minutes, rinsing said hair with water, and then drying said hair.  
     
     
         5 . An aqueous composition, which is said first pack for use in the hair treatment process according to any one of claims  1 - 3 , comprises 0.1 to 40 wt. % of said organic acid (A) or salt thereof and 0.1 to 20 wt. % of said hair keratin reducing substance, and has a pH of from 5 to 11.  
     
     
         6 . An aqueous composition, which is said second pack for use in the hair treatment process according to any one of claims  1 - 3 , comprises 0.1 to 40 wt. % of said organic acid (A) or salt thereof, 1 to 20 wt. % of a buffering agent and 0.1 to 20 wt. % of said oxidizing agent, and has a pH of from 1 to 5.  
     
     
         7 . An aqueous composition, which is said intermediate treatment for use in the hair treatment process according to  claim 2  or  3 , comprises 0.1 to 40 wt. % of said organic acid (A) or salt thereof and 1 to 20 wt. % of a buffering agent, and has a pH of from 1 to 5.  
     
     
         8 . An aqueous composition, which is said after-treatment for use in the hair treatment process according to  claim 4 , comprises 0.1 to 40 wt. % of said organic acid (A) or salt thereof and 1 to 20 wt. % of a buffering agent, and has a pH of from 1 to 5.