Highly dispersible alkaline earth metal compound fine powder, optical film, image display device, method for producing highly dispersible alkaline earth metal compound fine powder, fine powder dispersibility evaluation method, and fine powder dispersibility evaluation device

摘要

A highly dispersible alkaline earth metal compound fine powder comprising an alkaline earth metal compound as a main component and a surfactant attached to the surface of an alkaline earth metal fine particle having a wavelength of 0.154 nm by a small angle X-ray scattering method It is a highly dispersible alkaline earth metal compound fine powder having a scattering peak in scattering intensity within a range of a scattering angle 2θ measured by irradiating X-rays of 0.2 to 1.0 °. Also, a fine powder dispersibility evaluation method for evaluating the dispersibility of an alkaline earth metal compound fine powder dispersed in a solvent in a powder state, wherein the alkaline earth metal compound fine powder is obtained by a small angle X-ray scattering method. An X-ray irradiation process for obtaining a spectrum of scattering intensity at a scattering angle in a predetermined range by irradiating X-rays, and from this spectrum, the scattering angle 2θ has a scattering peak of scattering intensity within a range of 0.2 to 1.0 °. A scattering intensity analyzing step for analyzing whether or not, and a dispersibility estimating step for estimating the dispersibility of the alkaline earth metal compound fine powder in the solvent based on the detection result of the scattering peak.