Abstract
In order to prevent photoaging and to provide a younger impression of appearance, the composite powder was examined for its year-round UV-A protection effect and for improvement of skin color by its make-up effect. However, in recent years, many limitations have been imposed on the use of powders, including fine titanium dioxide and zinc oxide, in consideration of issues such as nanoparticles, dissolution into water and scattering into air. In addition, organic UV protection agents also have restrictions on their use due to their irritation and environmental risks. From the above background, iron oxides and titanium dioxide were fixed on the sericite surface by combining the original pulverizing and dispersion processes with bead mill and the spray-drying process. As a coated particle, titanium dioxide could be used as a UV-B protective material, and the pulverized iron oxides could be used as UV-A protective materials. The obtained composite powder was capable of protecting against ultraviolet rays in a wide range from UV-A to UV-B. In addition, it was confirmed that this composite powder had a reddish high chroma tone, and the powder foundation containing this composite powder gave a healthy impression of appearance. Therefore, the prepared composite powder that possesses these functions is thought to be a useful material with defensive and improvement effects on senior skin.
