ULTRAVIOLET SHIELDING COMPOSITE PARTICLES AND METHOD FOR PRODUCING SAME, DISPERSING LIQUID, WATER-BASED DISPERSION, AND OIL-BASED DISPERSION CONTAINING ULTRAVIOLET SHIELDING COMPOSITE PARTICLES, AND COSMETICS

摘要

These ultraviolet shielding composite particles comprise an organic ultraviolet absorber and metal oxide particles having ultraviolet shielding ability in resin, the average particle size thereof being 0.5 µm to 5 µm. The metal oxide particles comprise one type of more selected from the group consisting of zinc oxide, titanium oxide, cerium oxide, and iron oxide, the average particle size thereof being 0.003 µm to 0.1 µm. The content rate of the organic ultraviolet absorber is 0.1 mass% to 80 mass% and the content rate of the metal oxide particles is 1 mass% to 80 mass% in the composite particles, and the metal oxide particles are dispersed in the ultraviolet shielding composite particles. According to these ultraviolet shielding composite particles, deterioration, discoloration, decrease in in-use sensory feel of cosmetics caused by recrystallization of the organic ultraviolet absorber due to the influence of metal ion can be prevented.