Aqueous composition for cosmetics and cosmetic including the same

Abstract

The invention provides an aqueous composition that can alleviate at least one of the problems that the conventional aqueous compositions for cosmetics have, i.e., insufficient temporal stability, insufficient viscosity increase, being incapable of being used in a variety of pH ranges and being incapable of providing sufficient thixotropy. The aqueous composition for a cosmetic includes: (A) at least one selected from the group consisting of a cross-linked product of a hydroxyalkyl modified starch with a carbon number of 2 to 5, a cross-linked product of a hydroxyalkyl modified starch with a carbon number of 2 to 5 and an acyl modified starch with a carbon number of 2 to 18 and a cross-linked product of an acyl modified starch with a carbon number of 2 to 18; and (B) a water-soluble polymer material. When the water-soluble polymer material (B) is an association type poly(meth)acrylate polymer, a nonionic or cationic cellulose polymer, a poly(meth)acrylic acid polymer or xanthan gum, the aqueous composition exhibits excellent viscosity increase ratio and temporal stability.

What is claimed is:  
     
         1 . An aqueous composition to be mixed in a cosmetic, comprising: 
 (A) at least one selected from the group consisting of a cross-linked product of a hydroxyalkyl modified starch with a carbon number of 2 to 5, a cross-linked product of a hydroxyalkyl modified starch with a carbon number of 2 to 5 and an acyl modified starch with a carbon number of 2 to 18 and a cross-linked product of an acyl modified starch with a carbon number of 2 to 18; and    (B) a water-soluble polymer material.    
     
     
         2 . The aqueous composition according to  claim 1 , 
 wherein the water-soluble polymer material (B) comprises a poly(meth)acrylate polymer.    
     
     
         3 . The aqueous composition according to  claim 2 , 
 wherein the poly(meth)acrylate polymer is an association type polymer.    
     
     
         4 . The aqueous composition according to  claim 3 , 
 wherein the association type polymer is an anionic polymer.    
     
     
         5 . The aqueous composition according to  claim 3 , 
 wherein the association type polymer is a cationic polymer.    
     
     
         6 . The aqueous composition according to  claim 1 , 
 wherein the water-soluble polymer material (B) comprises a nonionic cellulose polymer.    
     
     
         7 . The aqueous composition according to  claim 6 , 
 wherein the nonionic cellulose polymer is hydroxyalkyl cellulose.    
     
     
         8 . The aqueous composition according to  claim 7 , 
 wherein the hydroxyalkyl cellulose is hydroxyethyl cellulose.    
     
     
         9 . The aqueous composition according to  claim 1 , 
 wherein the water-soluble polymer material (B) comprises a cationic cellulose polymer.    
     
     
         10 . The aqueous composition according to  claim 9 , 
 wherein the cationic cellulose polymer is O-[2-hydroxy-3-(trimethylammonio)propyl]hydroxyethyl cellulose chloride.    
     
     
         11 . The aqueous composition according to  claim 1 , 
 wherein the water-soluble polymer material (B) comprises a poly(meth)acrylic acid polymer.    
     
     
         12 . The aqueous composition according to  claim 1 , 
 wherein the water-soluble polymer material (B) comprises xanthan gum.    
     
     
         13 . The aqueous composition according to  claim 12 , 
 wherein the xanthan gum is heat-treated at 60° C. or higher.    
     
     
         14 . The aqueous composition according to any one of  claims 2  to  13 , 
 wherein a weight ratio of (A)/(B) is 30/1 to 0.5/1.  
 
     
     
         15 . The aqueous composition according to any one of  claims 2  to  14 , 
 wherein (A) constitutes 0.5 to 5.5 wt % of the whole of a cosmetic obtained by mixing the aqueous composition.  
 
     
     
         16 . The aqueous composition according to any one of  claims 1  to  15 , 
 wherein (A) is cross-linked by phosphorylation.  
 
     
     
         17 . The aqueous composition according to any one of  claims 1  to  16 , 
 wherein (A) is cross-linked by alkanedicarboxylic acid or alkenedicarboxylic acid.  
 
     
     
         18 . The aqueous composition according to any one of  claims 1  to  17 , 
 wherein the starches in (A) have an amylopectin content of at least 70 wt %.  
 
     
     
         19 . The aqueous composition according to any one of  claims 1  to  18 , wherein the pH is 3 to 11.  
     
     
         20 . A cosmetic comprising the aqueous composition according to any one of  claims 1  to  19 .  
     
     
         21 . The cosmetic according to  claim 20 , which is used as a cleansing cosmetic, a hair cosmetic, a make-up cosmetic or a skin care cosmetic.  
     
     
         22 . The cosmetic according to  claim 21 , 
 wherein the cleansing cosmetic is at least one selected from the group consisting of a shampoo, a rinse, a conditioner, a hand soap, a body soap, a facial wash and a make-up cleanser.    
     
     
         23 . The cosmetic according to  claim 21 , 
 wherein the hair cosmetic is at least one selected from the group consisting of a hair foam, a hair gel, a nonaerosol pump spray, a hair cream, a hair wax, an acidic hair dye, a hair colorant, a perming agent and a bleaching agent.    
     
     
         24 . The cosmetic according to  claim 21 , 
 wherein the make-up cosmetic is at least one selected from the group consisting of a manicure, a mascara, an eyeliner, an eye shadow, a liquid foundation, a lipstick and a cheek rouge.    
     
     
         25 . The cosmetic according to  claim 21 , 
 wherein the skin care cosmetic is at least one selected from the group consisting of a foundation, a pack, a sunscreen, a skin lotion, a milky lotion and a skin cream.    
     
     
         26 . A method for producing a cosmetic, wherein 
 the aqueous composition according to any one of  claims 2  to  19  is mixed in such a manner that (A) constitutes 0.5 to 5.5 wt % of the whole of a cosmetic obtained by mixing the aqueous composition and a weight ratio of (A)/(B) is 30/1 to 0.5/1.    
     
     
         27 . A method for increasing the viscosity of a cosmetic, wherein 
 the aqueous composition according to any one of  claims 2  to  19  is mixed in such a manner that (A) constitutes 0.5 to 5.5 wt % of the whole of a cosmetic obtained by mixing the aqueous composition and a weight ratio of (A)/(B) is 30/1 to 0.5/1.