2-benzoxazolyl benzene derivatives and their use as UV screening agents

Abstract

Novel benzoxazolyl benzene derivatives of formula (I): wherein R1 is hydrogen, C1-20-alkyl or C2-20-alkenyl; R2 and R3 are independently a group —C(R4,R5)C(R6)═C(R7,R8) (a) or a group —C(R4′,R5′)CH(R6′)CH(R7′,R8′) (b), wherein R4, R5, R6, R7, R8, R4′, R5′, R6′, R7′ and R8′ are independently, hydrogen, C1-10-alkyl or C2-10-alkenyl, or C2-10-alkyl or C3-10-alkenyl containing at least one oxygen atom interrupting the hydrocarbon chain; or wherein R4, R5, R6, R4′, R5′ and R6′ are hydrogen, C1-10-alkyl or C2-10-alkyl containing at least one oxygen atom interrupting the hydrocarbon chain, or alkyl substituted by silane or oligosiloxane moiety, and one of R7 and R8 or R7′ and R8′ is a silane or oligosiloxane moiety and the other one of R7 and R8 or R7′ and R8′ is hydrogen; and X is phenylene or naphthylene, or substituted phenylene or naphthylene for use as UV screening agents for protecting human skin or hair against radiation, and in UV screening compositions, particularly topical compositions for cosmentic or dermatological use.

Dependencies are inferred from the claim text.