Photostabilization of a sunscreen composition with a...

A - Human Necessities – 61 – K

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A61K 8/85 (2006.01) A61K 8/31 (2006.01) A61K 8/35 (2006.01) A61K 8/37 (2006.01) A61K 8/40 (2006.01) A61Q 17/04 (2006.01)

Patent

CA 2569324

Sunscreen compositions including a dibenzoylmethane derivative, such as avobenzone, that are made more stable by the addition of (a) an .alpha.-cyano- .beta.,.beta.-diphenylacrylate compound, e.g., octocrylene and (b) a diester or polyester of naphthalene dicarboxylic acid (diethylhexyl 2,6-naphthalate), having a weight ratio of (a)/(b) of at least 0.95, preferably at least about 1Ø More particularly, the invention relates to sunscreen compositions which utilize a combination of octocrylene and diethylhexyl 2,6-naphthalate to stabilize other photoactive compounds present in a sunscreen composition and, in particular, to stabilize dibenzoylmethane derivatives, without, or with levels less than 0.5% by weight of, a methoxy-substituted benzophenone derivative, such as benzophenone-3.

La présente invention concerne des compositions d'écran solaire comprenant un dérivé de dibenzoylméthane, tel que de l'avobenzone, qui sont rendues plus stables grâce à l'addition de (a) un composé .alpha.-cyano-.beta.,.beta.-diphénylacrylate, par exemple un octocrylène et (b) un diester ou un polyester d'acide naphtalène dicarboxylique (diéthylhexyl 2,6-naphtalate), avec un rapport de poids de (a)/(b) s'élevant à au moins 0,95, de préférence à au moins environ 1,0. Cette invention concerne plus particulièrement des compositions d'écran solaire qui utilisent une combinaison d'octocrylène et de diéthylhexyl 2,6-naphtalate pour stabiliser d'autres composés photoactifs qui sont présents dans une composition d'écran solaire et, notamment, pour stabiliser des dérivés de dibenzoylméthane, sans ou avec des concentrations inférieures à 0,5 % en poids d'un dérivé de benzophénone à substitution méthoxy, par exemple benzophénone-3.

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