PROBLEM TO BE SOLVED: To provide a composition having an upper critical solution temperature suitable for use as a cosmetic or skin external preparation, or having a temperature at which the solubility thereof rapidly increases.SOLUTION: According to the present invention, after determination of the upper critical solution temperatures of aqueous solutions of six different copolymers of acrylamide and acrylonitrile with different monomer mass-feeding ratios, a surfactant, such as an anionic surfactant, was added to the aqueous solutions containing the respective copolymers. As a result, the mixed solutions of copolymers showed lowered upper limit critical solution temperatures, respectively.SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】化粧料又は皮膚外用剤として使用するために適した上限臨界溶液温度、もしくは、急激に溶解度が上昇する温度を有する組成物を提供すること。【解決手段】モノマー質量仕込み比の異なるアクリルアミドとアクリロニトリルとの6種類の共重合体の水溶液の上限臨界溶液温度を決定後、各共重合体を含む水溶液に陰イオン性界面活性剤等の界面活性剤を添加したところ、いずれの共重合体の混合溶液においても上限臨界溶液温度が低下した。【選択図】なし
