| abstract |
The present invention provides a raw material for a cosmetic material which can be easily produced into a cosmetic which is excellent in stability and has a good feeling of use and is non-irritating to the skin. The raw material for cosmetics according to the present invention is characterized by comprising a polyoxyethylene macromonomer represented by the following formula (1), a hydrophobic monomer represented by the following formula (2), and the following formula (3) The core-crown type microgel dispersion obtained by radical polymerization of the crosslinkable monomer under the following conditions (A) to (E):n(A) The molar ratio expressed by the amount of the molar amount of the above-mentioned polyoxyethylene macromonomer or the amount of the above-mentioned hydrophobic monomer is 1:10 to 1:250.n(B) The amount of the crosslinkable monomer to be added is 0.1 to 1.5% by mass based on the amount of the hydrophobic monomer to be placed.n(C) The hydrophobic monomer represented by the following formula (2) is a monomer composition in which one or two or more kinds of methacrylic acid derivatives having an alkyl group having 1 to 8 carbon atoms are mixed.n(D) The polymerization solvent is a water-polyol mixed solvent, and the polyol is one or more selected from the group consisting of dipropylene glycol, 1,3-butylene glycol, and isoprene.n(E) Solvent composition of water-polyol mixed solvent, mass ratio at 20 ° C, water: polyol = 90 to 10: 10 to 90.n□ R1 represents an alkyl group having 1 to 3 carbon atoms, and n is a number of 8 to 200. X is H or CH3.n□ R 2 represents an alkyl group having 1 to 3 carbon atoms, and R 3 represents an alkyl group having 1 to 12 carbon atoms.n□ R4 and R5 are each independently, and represent an alkyl group having 1 to 3 carbon atoms, and m is a number from 0 to 2. |