Patent ID: 8529877

Claim:
A method of protecting of human and animal hair and skin from UV radiation comprising applying to the skin or hair of a human or animal in need thereof the compounds of formula wherein R 1 and R 2 independently of one another are hydrogen; unsubstituted or substituted C 1 -C 12 alkyl; unsubstituted or substituted C 3 -C 12 cycloalkyl; unsubstituted or substituted C 6 -C 20 aryl; or unsubstituted or substituted C 2 -C 20 alkenyl; R 3 is PO 3 R 1 R 2 ; COOR 6 ; COR 7 ; CONR 7 R 8 ; —SO 2 R 6 ; CN; unsubstituted or substituted C 6 -C 20 aryl; R 4 is unsubstituted C 6 -C 20 aryl; or C 6 -C 20 aryl which is substituted by at least one C 1 -C 18 alkyl, C 1 -C 18 alkoxy, C 3 -C 12 cycloalkyl, hydroxy, amino, mono- or di-C 1 -C 18 alkylamino, —NR 10 COR 11 or the radical of formula or unsubstituted or substituted C 4 -C 20 heteroaryl; R 5 is hydrogen; substituted or unsubstituted C 1 -C 20 alkyl; unsubstituted or substituted C 3 -C 12 cycloalkyl; unsubstituted or substituted C 6 -C 20 aryl; or unsubstituted or substituted C 4 -C 20 heteroaryl; or R 4 and R 5 form a cycloaliphatic ring; R 6 , R 7 and R 8 independently from each other are hydrogen; C 1 -C 18 alkyl or C 3 -C 12 cycloalkyl, which may be substituted by one or more E and/or interrupted by one or more D; or C 6 -C 20 aryl, which may be substituted by G; or R 7 and R 8 together form a five or six membered ring; D is —CO—; —COO—; —S—; —SO—; —SO 2 —; —O—; —NR 9 —; —SiR 12 R 13 —; —POR 14 —; —CR 15 ═CR 16 —; or —C≡C—; E is —OR 17 ; —SR 17 ; —NR 10 R 11 ; —NR 10 COR 11 ; —COR 11 ; —COOR 11 ; —CONR 10 R 11 ; —CN; halogen; SO 3 R 18 ; SO 2 R 18 ; PO 3 (R 18 ) 2 ; or PO 2 (R 18 ) 2 ; G is E; C 1 -C 18 alkyl, which is optionally interrupted by D; C 1 -C 18 perfluoroalkyl; C 1 -C 18 alkoxy, which is optionally substituted by E and/or interrupted by D; wherein R 9 , R 10 and R 11 , independently of each other are hydrogen; C 6 -C 18 aryl which is optionally substituted by C 1 -C 18 alkyl or C 1 -C 18 alkoxy; C 1 -C 18 alkyl, which is optionally interrupted by —O—; or R 10 and R 11 together form a five or six membered ring; R 12 and R 13 independently of each other are hydrogen; C 1 -C 18 alkyl; or C 6 -C 18 aryl which is optionally substituted by C 1 -C 18 alkyl; R 14 is C 1 -C 18 alkyl; or C 6 -C 18 aryl, which is optionally substituted by C 1 -C 18 alkyl; R 15 and R 16 independently of each other are hydrogen; C 6 -C 18 aryl which is optionally substituted by C 1 -C 18 alkyl or C 1 -C 18 alkoxy; or C 1 -C 18 alkyl which is optionally interrupted by —O—; R 17 is H; C 6 -C 18 aryl which is optionally substituted by C 1 C 18 alkyl or C 1 C 18 alkoxy; or C 1 C 18 alkyl which is optionally interrupted by —O—; and R 18 is hydrogen; C 6 -C 18 aryl, which is optionally substituted by C 1 -C 18 alkyl or C 1 -C 18 alkoxy; or C 1 -C 18 alkyl, which is optionally interrupted by —O—.