PROCÉDÉ DE PRODUCTION D'UNE COMPOSITION D'AGENT DE PROTECTION CONTRE LES ULTRAVIOLETS, ET COMPOSITION D'AGENT DE PROTECTION CONTRE LES ULTRAVIOLETS AINSI OBTENUE
Problem of the present invention is to provide a method of producing an ultraviolet protective agent composition, which has high transparency and excellent protection ability against a light of ultraviolet region of wavelengths of 200 to 420 nm, and an ultraviolet protective agent composition obtained by the production method. The present invention is a method of producing an ultraviolet protective agent composition, which comprises at least step (a) of precipitating iron oxide microparticles by mixing with a microreactor an iron oxide raw material fluid containing at least Fe 3+ ion, and an iron oxide precipitation fluid containing at least a basic substance； and step (b) of dispersing the above precipitated iron oxide microparticles in a dispersion medium to obtain iron oxide microparticle dispersion； wherein a haze value of the iron oxide microparticle dispersion is 2.0% or less, and a transmittance of the iron oxide microparticle dispersion for the light of the wavelengths of 200 to 420 nm is 2.0% or less.
