Patent ID: 7504528

Claim:
A method of protecting human and animal hair and skin from UV radiation comprising, applying thereto a compound of formula wherein R 2 is hydrogen; C 1 -C 22 alkyl; cyclo-C 3 -C 8 alkyl; unsubstituted or C 1 -C 6 alkyl- or C 1 -C 6 alkoxy-substituted C 6 -C 20 aryl; or a cyano group; R 4 is a cyano group; or -Q 1 -R 5 ; Q 1 is —COO—; —CONH—; —CO—; —SO 2 —; or —CONR 6 —; R 5 is C 1 -C 22 alkyl; cyclo-C 3 -C 8 alkyl; or unsubstituted or C 1 -C 6 alkyl-substituted C 6 -C 20 aryl; R 6 is hydrogen; C 1 -C 22 alkyl; cyclo-C 3 -C 8 alkyl; unsubstituted or C 1 -C 6 alkyl- or C 1 -C 6 alkoxy-substituted C 6 -C 20 aryl; the cyclohexene radical C is not substituted or substituted by one or more C 1 -C 5 alkyl; n is from 2 to 4; o is from 2 to 4; if n=2, in formula (1a) R 1 is an alkylene, cycloalkylene or phenylene-radical; or R 1 and R 2 simultaneously form a cycloalkylene or phenylene radical; and R 3 is a cyano group or -Q 1 -R 5 ; or R 3 and R 4 together form a 5- to 7-membered, monocyclic carbocyclic ring, which is optionally interrupted by —O— or —NR 7 —; If o=2, in formula (1b) R 3 is an alkylene, cycloalkylene or phenylene radical, which is optionally substituted with C 1 -C 4 alkyl, C 1 -C 4 alkoxy, —COR 6 , —COOR 6 or —CONHR 6 ; and R 1 is hydrogen; a cyano group; C 1 -C 22 alkyl; cyclo-C 3 -C 8 alkyl; unsubstituted or C 1 -C 6 alkyl- or C 1 -C 6 alkoxy-substituted C 6 -C 20 aryl; or R 1 and R 2 together with the nitrogen atom linking them form a —(CH 2 ) m — ring which is optionally interrupted by —O— or by —NR 7 —; R 7 is hydrogen; C 1 -C 22 alkyl; cyclo-C 3 -C 8 alkyl; unsubstituted or C 1 -C 6 alkyl- or C 1 -C 6 alkoxy-substituted C 6 -C 20 aryl; m is a number from 3 to 7; if n=3, in formula (1a) R 1 is a trivalent alkyl group, which is optionally interrupted by one or more —O— or —NR 7 -groups; and R 3 is a cyano group or -Q 1 -R 5 ; or R 3 and R 4 together form a 5- to 7-membered, monocyclic carbocyclic ring; if o=3, in formula (1b) R 3 is an alkylidene, cycloalkylidene or phenylidene radical; and R 1 is hydrogen; a cyano group; C 1 -C 22 alkyl; cyclo-C 3 -C 8 alkyl; unsubstituted or C 1 -C 6 alkyl- or C 1 -C 6 alkoxy-substituted C 6 -C 20 aryl; or R 1 and R 2 together with the nitrogen atom linking them form a —(CH 2 ) m — ring which is optionally interrupted by —O— or by —NR 7 —; if n=4, in formula (1a) R 1 is a tetravalent alkyl group; and R 3 is a cyano group; or -Q 1 -R 5 ; or R 3 and R 4 together form a 5- to 7-membered, monocyclic carbocyclic ring; if n=4, in formula (1b) R 3 is a tetravalent alkyl group; and R 1 is hydrogen; a cyano group; C 1 -C 22 alkyl; cyclo-C 3 -C 8 alkyl; unsubstituted or C 1 -C 6 alkyl- or C 1 -C 6 alkoxy-substituted C 6 -C 20 aryl; or R 1 and R 2 together with the nitrogen atom linking them form a —(CH 2 ) m — ring which is optionally interrupted by —O— or by —NR 7 —.