Material comprising an organic uv-a filter and method for...

A - Human Necessities – 61 – K

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Details

A61K 8/11 (2006.01) A61K 8/28 (2006.01) A61K 8/34 (2006.01) A61K 8/35 (2006.01) A61Q 5/00 (2006.01) A61Q 17/04 (2006.01) A61Q 19/00 (2006.01)

Patent

CA 2353709

The invention concerns a substance obtainable by sol-gel process, having a maximum absorption wavelength (.lambda.¿max?) in the interval ranging between 370 and 400 nm, said substance comprising at least an organic UV-A sunscreen filter having a .lambda.¿max? less than 370 nm, at least a metal alkoxide selected among zirconium, titanium and aluminium alkoxides, at least a functionalised organic polymer or a precursor of such a polymer, or at least a functionalised silicon-coated polymer or a precursor of such a polymer, at least a solvent and an amount of water sufficient for partial and/or total hydrolysis of the metal alkoxide and its condensation. The invention also concerns a method for displacing in the interval ranging from 370 to 400 nm, the maximum absorption wavelength of the organic UV-A sunscreen filter having a .lambda.¿max? less than 370 nm, and a cosmetic and/or dermatological composition for solar protection of the skin and/or other keratinous materials comprising the inventive substance.

La présente invention concerne un matériau susceptible d'être obtenu par voie sol-gel, présentant une longueur d'onde d'absorption maximale (.lambda.max) dans l'intervalle allant de 370 à 400 nm, ledit matériau comprenant au moins un filtre solaire UV-A organique ayant une .lambda.max inférieure à 370 nm, au moins un alcoxyde de métal choisi parmi les alcoxydes de zirconium, de titane et d'aluminium, au moins un polymère organique fonctionnalisé ou un précurseur d'un tel polymère, ou au moins un polymère siliconé fonctionnalisé ou un précurseur d'un tel polymère, au moins un solvant et une quantité d'eau suffisante pour l'hydrolyse partielle et/ou totale de l'alcoxyde de métal et sa condensation. La présente invention concerne aussi un procédé pour déplacer dans l'intervalle allant de 370 à 400 nm, la longueur d'onde d'absorption maximale d'un filtre solaire UV-A organique ayant une .lambda.max inférieure à 370 nm, ainsi qu'une composition cosmétique et/ou dermatologique pour la photoprotection de la peau et/ou des matières kératiniques, comprenant un matériau de l'invention.

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