• Journal of the Society of Cosmetic Scientists of Korea
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• v.37 no.3
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• pp.227-236
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• 2011

The new sunscreen agent, methoxycinnamidopropyl polysilsesquioxane, is manufactured as polymeric particles with an organic/inorganic hybrid composition. We have already reported the manufacturing method, physical properties, and sunprotection effects of methoxycinnamidopropyl polysilsesquioxane. In this study, we evaluated the photochemical properties and photostabilities of methoxycinnamidopropyl polysilsesquioxane that has the same functional group as a typical organic sunscreen agent, ethylhexyl methoxycinnamate (EHMC). Using the correlation of UV absorbance and fluorescence, we studied photostabilizers to enhance the photostability of methoxycinnamidopropyl polysilsesquioxane. Finally, we confirmed that octocrylene, ethylhexyl methoxycrylene, and bis-ethylhexyloxyphenol methoxyphenyl triazine were good photostabilizers for methoxycinnamidopropyl polysilsesquioxane.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.36 no.1
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• pp.47-55
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• 2010

UV-screening agents have some adverse effects that raise consumers' concern. The organic agents often cause irritation and may penetrate into human body while the inorganic agents raise aesthetic issues because they often turn opaque. Organic agents with high molecular weights and nano-sized inorganic agents have been developed respectively to minimize transdermal intrusion into human body and suppress turning opaque. Recently, we reported preparation of powdery UV-screening agents made of polysilsesquioxane, an organic-inorganic hybrid material. Powders would not penetrate into epidermis and organic-inorganic hybrid nature would suppress the opaqueness problem. In this study, we continued our research on this powdery polysilsesquioxane UV-screening agent, SESQUV, regarding its chemical composition, its synergic UV-screening effects when mixed with other organic agents, and its applicability in practical formulation. Results showed SESQUV was promising UV-screening agents useful in sunscreen formulation.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.37 no.3
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• pp.247-256
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• 2011

Existing organic UV protection materials seem to be problematic due to their penetration and irritation to skin. Inorganic UV protection materials are also at issue for safety of their nano-type transformation. Therefore, the recent studies of UV protection materials have been focused not only on the effectiveness but also on their safety. One of the UV protection materials in study which have higher safety is the organic-inorganic conjugation type UV protection material. Previously, we have reported the manufacturing process, physical property and UV protection efficiency of methoxychinnamidoprophy poloysilsesquixan as a new cross-linked polymer type UV protection material. In this study, we have evaluated the effect of the methoxychinnamidoprophy poloysilsesquixan on embryo-fetal development in SD rats. This study is expected to show some definite information related to the effect on pregnancy or embryo-fetal abnormality in case of the clinical exposure of the methoxychinnamidoprophy poloysilsesquixan.