Spherical monodisperse polyester resin aqueous dispersion, process for producing the same, true spherical monodisperse polyester resin particles, and cosmetics
New technical means that can stably and inexpensively realize useful spherical monodisperse polyester resin particles and their water-based dispersions, and a water-resistant and smooth feel that does not give the skin a sense of incongruity. Provide cosmetics with good extensibility. A spherical monodisperse polyester resin aqueous dispersion in which a polyester resin is dispersed in water, wherein the polyester resin has an average particle diameter of 1-1000 μm, and the sphericity is an average value of the major axis / minor axis of the particle. 1.00 to 1.10, monodispersity is 8% or less as a coefficient of variation from the average particle size and standard deviation, and in the dispersion, together with the polyester resin, as a dispersant, (A) average An anionic polymer compound having a molecular weight of 5 million or more and 25 million or less and (B) polyvinyl alcohol are contained at a mass ratio (A / B) of 1/10 to 1/99, and the dispersion has a viscosity of 0.1 to 5 Pa · s.簡単かつ安価に、有用な真球状単分散性ポリエステル樹脂粒子とその水系分散体を安定して実現することのできる新しい技術手段と、耐水性が良好で滑らかな感触で肌に違和感を与えない、伸展性の良好な化粧品を提供する。 ポリエステル樹脂が水に分散された真球状単分散性ポリエステル樹脂水系分散体であって、前記ポリエステル樹脂の粒子平均粒径は１～１０００μｍ、その真球度は粒子の長径／短径の平均値として１．００～１．１０、単分散性は、平均粒径と標準偏差からの変動係数として８％以下であり、前記分散体中には、前記ポリエステル樹脂とともに、分散剤として、（Ａ）平均分子量５００万以上２５００万以下のアニオン性高分子化合物と（Ｂ）ポリビニルアルコールとを質量比（Ａ／Ｂ）で１／１０～１／９９の割合で含有し、前記分散体は、その粘度が、０．１～５Ｐａ・ｓである。
