Aqueous hair cleansing agent

Abstract

An aqueous hair cleansing agent contains a sulfate-type anionic surfactant having a specific structure, an ether carboxylate-type anionic surfactant having a specific structure, and an organic carboxylic acid or salt thereof, thereby has a pH of 1 to 5 at 25° C. when diluted 20-fold with water.

1 . An aqueous hair cleansing agent comprising components (A), (B) and (C):
 (A) surface anionic surfactant represented by the formula (1):
   R 1 O(CH 2 CH 2 O) n SO 3 M  (1),
 
   wherein R 1  represents an alkyl group or alkenyl group having from 10 to 18 carbon atoms, M represents a cation derived from an alkali metal, an alkali earth metal, ammonium, alkanolamine or a basic amino acid, and n represents a number from 0 to 5 estimated based on the weight average, and wherein the content of the component (A) is from 1 to 25% by weight of the total aqueous hair cleansing agent;   (B) an ether carboxylate anionic surfactant represented by the formula (2) or (3):
   R 2 O(CH 2 CH 2 O) m CH 2 COOX  (2)
 
   R 2 C(═O)NH(CH 2 CH 2 O) m CH 2 COOX  (3),
 
   wherein R 2  represents an alkyl group having from 12 to 16 carbon atoms, X represents a cation derived from an alkali metal, an alkali earth metal, ammonium, alkanolamine or a basic amino acid, and m represents a number of 0.5 to 10 estimated based on weight average, wherein the content of the component (B) is from 0.5 to 10% by weight of the total aqueous hair cleansing agent;   (C) an organic carboxylic acid or a salt thereof, wherein the content of the (C) organic carboxylic acid or salt thereof is from 0.1 to 5% by weight of the total aqueous hair cleansing agent; and   water, and
 having a pH of from 1 to 5 at 25° C. when diluted 20-fold with water. 
   
     
     
         2 . The aqueous hair cleansing agent according to  claim 1 , wherein the a ratio of the component (B), relative to the total of the components (A) and (B), is 50% or less based on the weight ratio. 
     
     
         3 . The aqueous hair cleansing agent according to  claim 1 , further comprising at least anti-inflammatory agent in an amount of from 0.001 to 10% by weight. 
     
     
         4 . The aqueous hair cleansing agent according to  claim 1 , wherein the (C) organic carboxylic acid is at least one acid selected from the group consisted of glycolic acid, lactic acid, malonic acid, maleic acid, and malic acid. 
     
     
         5 . A method for cleansing hair, comprising applying the aqueous hair cleansing agent according to  claim 1  to hair. 
     
     
         6 . The aqueous hair cleansing agent according to  claim 1 , wherein the organic carboxylic acid is at least one acid selected from the group consisting of a dicarboxylic acid, which optionally has at hydroxy groups, and a hydroxymonocarboxylic acid. 
     
     
         7 . The aqueous hair cleansing agent according to  claim 3 , wherein the anti-inflammatory agent is at least one agent selected from the group consisting of glycyrrhetinic acid, glycyrrhizic acid, ε-aminocaproic acid, allantoin, sodium guaiazulene sulfonate, d-camphor, l-menthol, urea, pyridoxine dipalmitate, glycyrrhetinyl stearate, tranexamic acid, vitamin A oil, hydrocortisone, prednisolone, pyridoxine hydrochloride, zinc oxide, and hydrocortisone acetate. 
     
     
         8 . The aqueous hair cleansing agent according to  claim 3 , wherein the anti-inflammatory agent is at least one salt of glycyrrhetinic acid or glycyrrhizic acid selected from the group consisting of a sodium salt, potassium salt, and ammonium salt. 
     
     
         9 . The aqueous hair cleansing agent according to  claim 3 , wherein the anti-inflammatory agent is at least one salt selected from the group consisting of dipotassium glycyrrhizinate, disodium glycyrrhizinate, trisodium glycyrrhizinate, monoammonium glycyrrhizinate, glycerin glycyrrhetinate, and stearyl glycyrrhetinate. 
     
     
         10 . The aqueous hair cleansing agent according to  claim 3 , wherein the anti-inflammatory agent is at least one salt selected from the group consisting of disodium glycyrrhizinate, trisodium glycyrrhizinate, monoammonium glycyrrhizinate, glycerin glycyrrhetinate, and stearyl glycyrrhetinate. 
     
     
         11 . The aqueous hair cleansing agent according to  claim 3 , wherein the anti-inflammatory agent is at least one ester of glycyrrhetinic acid or glycyrrhizic acid selected from the group consisting of glycerin ester and stearyl ester. 
     
     
         12 . The aqueous hair cleansing agent according to  claim 3 , wherein the amount of the anti-inflammatory agent is from 0.01 to 1% by weight. 
     
     
         13 . The aqueous hair cleansing agent according to  claim 1 , wherein the content of the organic carboxylic acid (C) or salt thereof is from 0.5 to 5% by weight of the total aqueous hair cleansing agent. 
     
     
         14 . The aqueous hair cleansing agent according to  claim 1 , wherein the content of the organic carboxylic acid (C) or salt thereof is from 0.2 to 3% by weight of the total aqueous hair cleansing agent. 
     
     
         15 . The aqueous hair cleansing agent according to  claim 1 , wherein the content of the organic carboxylic acid (C) or salt thereof is from 0.5 to 2% by weight of the total aqueous hair cleansing agent.