| abstract |
Compounds of formula I. wherein R 1 and R 2 independently of one another are unsubstituted or substituted by C 1 -C 3 alkyl Cs-C 7 cycloalkyl and R 2 furthermore C 1 -C 12 alkyl, phenyl, unsubstituted or in the phenyl ring by -OH and / or -OCH 3 and / or C 1 -C 12 alkyl-substituted C 7 -C 10 phenylalkyl, X is oxygen or -N (R 3 ) -. R 3 is hydrogen, C 1 -C 4 alkyl or phenyl, n is 0, 1 or 2, m is an integer between 1 and 4 and if m is 1, AC 8 -C 20 alkyl is if m 2 is AC 2 -C 18 alkylene or C 2 -C 18 alkylene interrupted by -O-, -S-, -N (R 3 ) - or -NH-COCO-NH- or if X is -N (R 3 ) - is additionally a direct bond or a group of the formula II, III or IV, wherein X 1 is C 1 -C 12 alkyl, cyclohexyl, phenyl, benzyl or tetrahydrofuryl, X 2 and X 4 are C 1 -C 12 alkyl, X 3 C 1 -C 12 alkyl, cyclohexyl, phenyl, by C 1 -C 4 alkyl and / or -OH substituted phenyl, piperidyl or tetrahydrofuryl and X 5 and X 6 independently of one another are C 1 -C 12 alkyl, cyclohexyl, benzyl, phenyl, by C 1 -C 4 alkyl and / or OH are substituted phenyl or naphthyl when m is 3, A is a trivalent aliphatic hydrocarbon radical with 3 to 7 carbon atoms and when m is 4, A is a tetravalent aliphatic hydrocarbon radical with 4 to 10 carbon atoms, are suitable for stabilizing organic material against thermo-oxidative and / or light-induced degradation. |