Photostable cosmetic compositions

A - Human Necessities – 61 – K

Patent

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Details

A61K 8/35 (2006.01) A61K 8/36 (2006.01) A61K 8/39 (2006.01) A61K 8/86 (2006.01) A61Q 17/04 (2006.01)

Patent

CA 2660527

Photostable cosmetic compositions comprising sunscreens, more particularly to cosmetic compositions comprising dibenzoylmethane sunscreens are provided. It is known that dibenzoylmethane and its derivatives are relatively sensitive to ultraviolet radiation and they decompose rapidly under the effect of sunlight. This decomposition is accelerated in the presence of UV-B sunscreens, especially p-methoxycinnamic acid and its derivatives. The present inventors have surprisingly found that cosmetic compositions comprising dibenzoylmethane or its derivative and p-methoxycinnamic acid or its derivative, can be stabilized by incorporating a combination of fatty alcohol ethoxylates and polyalkyleneglycol.

La présente invention concerne des compositions cosmétiques photostables comprenant des écrans solaires, en particulier des compositions cosmétiques comprenant des écrans solaires à base de dibenzoylméthane. On sait que le dibenzoylméthane et ses dérivés sont relativement sensibles au rayonnement ultraviolet et qu'ils se décomposent rapidement sous l'effet de la lumière du soleil. Cette décomposition est accélérée en présence d'écrans solaires contre les UV-B, en particulier d'acide p-méthoxycinnamique et ses dérivés. Les présents inventeurs ont découvert de manière surprenante que les compositions cosmétiques comprenant du dibenzoylméthane ou son dérivé et de l'acide p-méthoxycinnamique ou son dérivé peuvent être stabilisées par incorporation d'une combinaison d'éthoxylates d'alcool gras et de glycol de polyalkylène.

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