Patent ID: 7560502

Claim:
A composition comprising a) an organic material which is susceptible to oxidative, thermal or light-induced degradation, and b) at least a compound of the formula I wherein R 1 is —NO 2 , —N═CH—R 4 or R 2 is —X—R 3 , R 3 is a fluorine containing group, R 4 is C 1 -C 25 alkyl, C 3 -C 25 alkenyl, unsubstituted or C 1 -C 4 alkyl substituted phenyl; R 5 is hydrogen, —Y—R 7 , R 6 is hydrogen, C 1 -C 8 alkyl or benzyl, R 7 is C 1 -C 25 alkyl, C 2 -C 25 alkenyl, unsubstituted or C 1 -C 4 alkyl or C 1 -C 4 alkanoylamino substituted phenyl; unsubstituted or C 1 -C 4 alkyl substituted phenylamino; R 8 is —NO 2 , —N═CH—R 4 or R 9 is hydrogen or —Y—R 7 , R 10 is hydrogen, C 1 -C 8 alkyl or benzyl, X is R 11 is hydrogen, C 1 -C 8 alkyl or benzyl, Y is Z is C 1 -C 25 alkylene, 1,2-phenylene, 1,3-phenylene, 1,4-phenylene and R 12 and R 13 are each independently of one another hydrogen, C 1 -C 12 alkyl or phenyl, or R 11 and R 12 together with the linking carbon atom, form a C 5 -C 8 cycloalkylidene ring which is unsubstituted or substituted by 1 to 3 C 1 -C 4 alkyl groups.