Patent ID: 6413503
Filing Date: 2002-07-02
Classification: A61K,A61Q

Abstract:
A method for treating human skin and/or human hair against solar rays which comprises applying thereto, as a photostable UV filter in a cosmetic and/or pharmaceutical preparation, a composition comprising at least one compound of the formula I in whichR1 and R2 are identical or different, electron-withdrawing radicals chosen from the group consisting of cyano, alkyl- or arylcarbonyl, alkyloxy- or aryloxycarbonyl and optionally substituted aminocarbonyl, R3 is a hydrogen atom, a C1-C20-alkyl radical or a C3-C20-cycloalkyl radical or a radical of the formula â€”CH2â€”CH2â€”SO3â€”M+, where M+ is a cation, X is the divalent radical of oxygen, sulfur or the radical â€ƒwhere R3 is as defined above, Z is the divalent radical of the formula II or III, which forms a fused system with the radical of the formula I â€ƒwhere R4 can be bonded one or more times to the benzylidene ring I or naphthylidene ring II, and is hydrogen, alkyl, cycloalkyl, alkyloxy, cycloalkyloxy, alkoxycarbonyl, mono- or dialkylaminocarbonyl, alkylamino, dialkylamino, each having up to 20 carbon atoms, and also cyano, amino and SO3â€”M+, where M+ is a cation.