Abstract
Recent studies on the influence of ultraviolet light (UV) on the skin have clarified that UV not only causes sunburn and pigmentation in the skin but also induces photosensitive dermatitis and promotes photoaging. Current popular sunscreen agent protecting the skin from these disorders include UV absorbent or titanium oxide. These however carry problems in thier safety or feeling in use. The present authors, taking into consideration the stability, safety, and characteristics in use. focused special attention on pigment materials especially those consisting of organic polymors. which have led to the development of UV absorbing hollow organic microspheres. These microspheres are synthesized by multilayer emulsion polymerization and have external diameters ranging from 0.2 to 0.4μm and a shere exhibits photoabsorption at appropriate wavelengths, which, coupled with the UV diffusion occurring within the sphere, obstruct the penetration of UV. The microspheres are stable to light and show a high level of safety. Additionally, since these microspheres are submicron in size, their adhesion to the skin is satisfactory. Although these UV absorbent hollow organic microspheres exhibit an inferior UV obstracting capacity when incorporated in a cosmetic product, compared with of titanium oxide microparticle, the hollow microspheres applied to the skin can give a natural finished appearance in contrast to the somewhat bluishwhite hue of the skin finished with titanium oxide microparticles.
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