Hydrogenated Polydecences and High-SPF Physical Sunscreens

May 6, 2003 | Contact Author | By: L. Rigano and A. Mezzanotte, Rigano Laboratories; M. Lohman, Fortum Oil & Gas Oy; and L Kujansivu, Kemira Pigments Oy
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Keywords: hydrogenated polydecenes | sunscreens | physica filters | titanium dioxide | photo-stability | wetting power

Abstract: New methods of micronization and coating of physical filters combined with vehicles containing high amounts of hydrogenated polydecenes provide high-SPF sunscreens that show improvements in photostability, effect-to-dose ratio, and skin substantively.

The requirements of an effective sunscreen include high solubility of organic filters in the vehicles, efficient dispersion of physical filters, absence of crystallization afte rapplication onto the skin surface and lack of aggregation phenomena of micronized powders in the product. Moreover, an effective sunscreen requires an appropriate load of inorganic filters as well as their optimum wetting and the formulation of the transparent limit layer (i.e. the residual layer on the skin that cannot be further thinned by massage) over the skin surface.