| abstract |
a new technical medium that can stably achieve useful monodisperse spherical polyester resin particles and an aqueous dispersion thereof in an easy and inexpensive way, and a cosmetic product with fine extensibility, which has good water resistance and soft touch and is not provides an uncomfortable feeling to the skin; an aqueous dispersion of spherical monodisperse polyester resin, including a water-dispersed polyester resin, wherein the polyester resin has an average particle diameter in the range of 1 to 1000 µm, a sphericity in the range of 1.00 to 1.10 as an average value of the long diameter/short diameter of the particles, and a monodispersity as a coefficient of variation from the average diameter of the particles and a standard deviation of 8% or less; the dispersion contains, together with the polyester resin, (a) an anionic polymeric compound having an average molecular weight of 5,000,000 or more and 25,000,000 or less, and (b) a polyvinyl alcohol, as dispersing agents, in a proportion in the range of 1 /10 to 1/99 mass ratio (a/b), and the dispersion has a viscosity in the range of 0.1 to 5 pa¿. |