Cosmetic raw material using core-corona type microparticles and oil-in-water emulsified cosmetic

Abstract

An emulsifier is comprised of core-corona type microparticles that an emulsification capability thereof is not affected by the crosslinking level and an oil-in-water emulsified cosmetic emulsified by the afore-mentioned emulsifier. A cosmetic raw material comprising: a core-corona type microparticles that is obtained by radical polymerization of a polyethylene oxide macromonomer represented by a chemical formula (1), and at least one hydrophobic monomer selected from a group of an acrylate derivative monomer represented by a chemical formula (2) and an acrylamide derivative monomer represented by a chemical formula (3) under the conditions (A) to (D); wherein R 1 is at least one substitute selected from a group consisting of H and an alkyl group having 1 to 3 carbon atoms, n is a number of 8 to 200, and X is at least one substitute selected from a group consisting of H and CH 3 ; wherein R 2 is at least one substitute selected from a group consisting of H and an alkyl group having 1 to 3 carbon atoms, and R 3 is a substituent that has an alkyl group having 1 to 12 carbon atoms; wherein R 4 is at least one substitute selected from a group consisting of H and an alkyl group having 1 to 3 carbon atoms, and both R 5 and R 6 are one substitute selected from a group consisting of H and substituents that have an alkyl group having 1 to 18 carbon atoms.

1 . A cosmetic raw material, comprising:
 a core-corona type microparticles that is obtained by radical polymerization of a polyethylene oxide macromonomer represented by a chemical formula (1), and at least one hydrophobic monomer selected from a group of an acrylate derivative monomer represented by a chemical formula (2) and an acrylamide derivative monomer represented by a chemical formula (3) under the following conditions (A) to (D);   (A) a molar ratio expressed by a feed molar amount of the polyethylene oxide macromonomer/a feed molar amount of (the acrylate derivative monomer and/or the acrylamide derivative monomer) is 1:10 to 1:250;   (B) the macromonomer represented by the chemical formula (1) is at least one derivative selected from a group consisting of an acrylic acid derivative and a methacrylic acid derivative that have a polyethylene glycol group with 8 to 200 repeating units,   
       the acrylate derivative monomer represented by the following formula (2) is at least one monomer selected from a group consisting of an acrylic acid derivative and a methacrylic acid derivative that have a substituent comprising an alkyl group having 1 to 12 carbon atoms, and 
       the acrylamide derivative monomer represented by the chemical formula (3) is at least one monomer selected from a group consisting of an acrylamide derivative and a methacrylamide derivative that have a substituent comprising an alkyl group having 1 to 18 carbon atoms;
 (C) a polymerization solvent is a mixture of alcohol and water, 
 
       wherein the alcohol is at least one alcohol selected from a group consisting of ethanol, dipropylene glycol, 1,3-butylene glycol and isoprene glycol; and
 (D) a mass ratio of a solvent composition of the mixed solvent of alcohol and water is in a range of 9 to 1/9 at 20° C.; 
 
       
         
           
           
               
               
           
         
         wherein R 1  is at least one substitute selected from a group consisting of H and an alkyl group having 1 to 3 carbon atoms, n is a number of 8 to 200, and X is at least one substitute selected from a group consisting of H and CH 3 ; 
       
       
         
           
           
               
               
           
         
         wherein R 2  is at least one substitute selected from a group consisting of H and an alkyl group having 1 to 3 carbon atoms, and R 3  is a substituent that has an alkyl group having 1 to 12 carbon atoms; 
       
       
         
           
           
               
               
           
         
         wherein R 4  is at least one substitute selected from a group consisting of H and an alkyl group having 1 to 3 carbon atoms, and both R 5  and R 6  are one substitute selected from a group consisting of H and substituents that have an alkyl group having 1 to 18 carbon atoms. 
       
     
     
         2 . The cosmetic raw material according to  claim 1 , wherein a particle size of the core-corona type microparticle is in a range of 50 to 400 nm. 
     
     
         3 . The cosmetic raw material, according to  claim 1 , wherein:
 said cosmetic raw material is an emulsifier.   
     
     
         4 . An oil-in-water emulsified cosmetic, wherein the emulsified cosmetic is emulsified by the emulsifier according to  claim 3 . 
     
     
         5 . The cosmetic raw material, according to  claim 1  is a clouding agent. 
     
     
         6 . The cosmetic raw material according to  claim 2  is an emulsifier. 
     
     
         7 . An oil-in-water emulsified cosmetic; wherein the cosmetic is emulsified by the emulsifier according to  claim 6 . 
     
     
         8 . The cosmetic raw material according to  claim 2  is a clouding agent.