abstract |
[PROBLEMS] When a polymer having an acrylamide alkyl sulfonic acid unit used as a water-soluble thickener in a skeleton is blended in cosmetics, it can exhibit sufficiently satisfactory usability, and has high stability and safety. Providing the copolymer as a water-soluble thickener. SOLUTION: 2-acrylamido-2-methylpropanesulfonic acid or a salt thereof, hydroxyethylacrylamide, and a crosslinkable monomer are copolymerized, or the obtained copolymer is further added with an alkali agent. A water-soluble thickener comprising a copolymer obtained by neutralization. Moreover, it is a cosmetic characterized by blending this water-soluble thickener. [Selection figure] None |