It offers strong UV protection, no white cast, and a light texture. When applied, the new formulation forms a seamless layer of UV scattering agents that effectively protects the skin from UV rays.
This technology is based on the novel idea of dispersing a UV scattering agent (titanium oxide, etc.) contained in a specially developed capsule stabilized at the aqueous phase.
Formula Research
Kao found that UV scattering agents do not disperse in water and often use an oil base, usually leading to a heavy product.
A water-based formulation worked well for achieving a light texture, but since the UV scattering agent only penetrates oil droplets, it was difficult for UV absorber-free sunscreens to give good UV protection.
During research, Kao found that when a water-based product was applied to the skin, the water evaporated, leaving gaps that UV rays could easily penetrate, resulting in sunburn.
Kao then began to develop a water-based UV absorber-free sunscreen offering good daily UV protection and a light, white cast-free texture.
To achieve the intended effect of UV protection, Kao studied and designed the capsule size, material, and concentration of the UV scattering agent to be enclosed in it.
This resulted in the optimum capsule containing a UV scattering agent, completing the formulation.
Study results found that the new emulsion had higher density compared to the emulsion containing no capsules. This indicated an even protective layer and the UV scattering agents contained in the capsules and oil droplets were dispersed across the skin.
Building on this knowledge, Kao will continue to develop sunscreen products for everyday use, using ingredients available around the world.
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