Broad spectrum sunscreen composition comprising 2 hydroxy sulfobetaine of cinnamidoalkyl amine

A photostable cosmetic composition for protection against UVA and UVB radiations of wavelengths between 280 and 400 nm, which comprises, in a cosmetically acceptable vehicle;

• (i) at least one UVA-sunscreen agents selected from the group consisting of Butyl Methoxydibenzoylmethane/Avobenzone, Benzophenone-3, Benzophenone-4, Benzophenone-5, Disodium Phenyl Dibenzimidazole Tetrasulfonate, Drometrizoletrisiloxane, Terephthalyidene Dicamphor Sulfonic Acid, bis-Ethylhexyloxyphenol Methoxyphenyl Triazine, Methylene bis Benzotriazolyl Tetramethylbutylphenol, and Diethylaminohydroxybenzoylhexylbenzoate in the range 0.5 to 5%;
• (ii) at least one UVB-sunscreen agents selected from the group consisting of Ethylhexyl Salicylate, Homosalate, Isoamyl p-Methoxy cinnamate, Octocrylene, 4-Methylbenzylidene Camphor, 3-Benzylidene camphor, Benzylidene Camphor Sulfonic Acid, Camphor Benzalkonium Methosulfate, Polyacrylamidomethyl Benzylidene Camphor, Ethylhexyl Triazone, Diethylhexyl Butamido Triazone and Polysilicon-15 in the range 0.5 to 10% and
• (iii) at least 0.1% by weight of a 2-hydroxy sulfobetaine of cinnamidoalkyl amine compound having general formula:
• wherein,
• R1 is a substituent, selected from hydrogen, halo, —OH, —NH2, —NO2, —OCH3, —N(CH3)2, alkyl groups containing from 1 to 6 carbon atoms, alkoxy groups containing from 1 to 6 carbon atoms, alkylamino or N,N-dialkylamino groups containing from 1 to 6 carbon atoms;
• R2 is selected from hydrogen, alkyl group containing from 1 to 12 carbon atoms;
• R3 and R4 are independently selected from benzyl, alkyl group containing from 1 to 12 carbon atoms,
• n is an integer from 1 to 6.
• with the proviso that the UVB sunscreen agents exclude Ethylhexyl Methoxycinnamate and Phenylbenzimidazole Sulfonic Acid.