The invention relates to new s-triazine derivatives of the formula (I): in which R1 represents an —NH—F radical, wherein F is a screening chromophore; R2 represents an —NH—Z—W radical, wherein Z is a divalent radical providing the connection between —NH— and —W, and W is a silicone-containing radical; and R3 is R1, R2, a linear or branched C1-C20 alkyl radical, a linear or branched C2-C20 hydroxyalkyl radical, a linear or branched C1-C20 alkoxy radical, an NHR8 radical or an N(R8)2 radical, with R8 being a linear or branched C1-C20 alkyl radical. The compounds of the invention are useful as organic sunscreen agents in cosmetic compositions intended for the protection of the skin and the hair against ultraviolet radiation. The invention also relates to the use of the compounds in cosmetic applications and to cosmetic compositions with improved properties containing these compounds.