PROBLEM TO BE SOLVED: To provide an aqueous resin dispersion for a cosmetic having excellent stability with time and three characteristics of makeup durability, water resistance and removability.SOLUTION: There is provided an aqueous resin dispersion for a cosmetic which comprises resin particles and an aqueous medium, wherein the resin is a polymer of a monomer mixture containing a methacrylic acid alkyl ester having an alkyl group having 2 to 4 carbon atoms and acrylic acid and contains more than 10 mass% or 80 mass% or less of the methacrylic acid alkyl ester having an alkyl group having 2 to 4 carbon atoms in 100 mass% of the monomer mixture and the resin has a glass transition temperature of-20 to 100°C.SELECTED DRAWING: NoneCOPYRIGHT: (C)2019,JPO&INPIT【課題】本発明は、経時安定性に優れ、化粧持ち、耐水性および除去性という3つの特性を併せ持つ化粧料用水性樹脂分散体の提供を目的とする。【解決手段】樹脂粒子と水性媒体とを含み、前記樹脂が、炭素数2~4のアルキル基を有するメタクリル酸アルキルエステルおよびアクリル酸を含む単量体混合物の重合物であり、前記単量体混合物100質量%中に前記炭素数2~4のアルキル基を有するメタクリル酸アルキルエステルを10質量%を超え80質量%以下含み、前記樹脂のガラス転移温度が-20~100℃である、化粧料用水性樹脂分散体。【選択図】なし
