Patent ID: 7714044

Claim:
A process for protecting organic material from the damaging effect of light, comprising adding an organic material in need of protection from the damaging effect of light to at least one naphthalene-1,8-dicarboxylic monoimide of the formula I in which R 1 is hydrogen, alkyl, alkenyl, cycloalkyl, cycloalkenyl, heterocycloalkyl, aryl or heteroaryl and R 2 is cyano, —C(O)NR 5 R 5a or phenyloxy which carries one or more substituents selected from C 1 -C 12 alkyl, C 1 -C 12 alkoxy, —COOR 6 , —SO 3 R 6 , halogen, hydroxyl, carboxyl, cyano, —CONR 5 R 5a , and —NHCOR 5 ; R 5 and R 5a each independently of one another are hydrogen, C 1 -C 18 alkyl, aryl or heteroaryl, aryl and heteroaryl each being unsubstituted or carrying one or more substituents selected from C 1 -C 6 alkyl, C 1 -C 6 alkoxy, hydroxyl, carboxyl, and cyano; and R 6 is hydrogen or C 1 -C 6 alkyl.