Preparation of Silica Gels Carrying Cinnamamido Groups and Their Protectional Function from Ultraviolet Rays

Kazuhiro SUETSUGU*, Yuji YAMADA and Hisatoshi KONISHI†

Research & Development Department, Naris Cosmetics Co.,Ltd.; 1-11-17 Ebie Fukushima-ku, Osaka-shi 553-0001 Japan
† Department of Materials Science, Faculty of Engineering, Tottori University; 4-101 Koyama-minami, Tottori-shi 680-8552 Japan

With the aim to develop a new type of UV-protective cosmetic material being less irritant to skin, the silica gels having chemically bonded ultraviolet absorbent were prepared by the modification of the surface of the silica gels with cinnamamido groups. The silica gel sample were evaluated by their visible and UV transmittance spectra and the samples made from non-porous fine particle of silica gels were found to be transparent to visible light and screen ultraviolet rays. The appearance of the chemically modified silica gels was clear and natural when applied to human skin.
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