Polymer stabilizers containing both hindered amine and hydroxylamine moieties

A stabilized composition which comprises

• (a) a polymer subject to the deleterious effects of actinic light or of heat, and
• (b) an effective stabilizing mount of a compound of formula IV ##STR12## wherein L.sub.3, L.sub.4 and L.sub.5 are independently --NR.sub.5 OH, --OR.sub.4, --SR.sub.4 or --NR.sub.5 R.sub.6 where R.sub.4 is alkyl of 1 to 18 carbon atoms, and R.sub.5 and R6 are independently hydrogen, alkyl of 1 to 18 carbon atoms, 2,2,6,6-tetramethyl-4-piperidyl, 1,2,2,6,6-pentamethyl-4-piperidyl, tetrahydrofurfuryl, C.sub.2 -C.sub.4 -alkyl which is substituted in the 2-, 3- or 4-position by OH, by C.sub.1 -C.sub.8 -alkoxy or by di(C.sub.1 -C.sub.4 -alkyl)amino, or --NR.sub.5 R.sub.6 is pyrrolidyl, piperidyl, morpholinyl, N-methylpiperazinyl or hexahydroazepinyl, or
• L.sub.3, L.sub.4 and L.sub.5 are independently ##STR13## where R.sub.7 is hydrogen, hydroxyl, alkyl of 1 to 12 carbon atoms or ##STR14## with the proviso that at least one of L.sub.3, L.sub.4 or L.sub.5 is ##STR15## where R.sub.7 is hydroxyl;
• or is --NR.sub.5 OH;
• E is hydrogen, oxyl, hydroxyl, alkyl of 1 to 18 carbon atoms, alkenyl of 3 to 18 carbon atoms, aralkyl of 7 to 9 carbon atoms, cycloalkyl of 5 to 12 carbon atoms, hydroxylalkyl of 2 to 6 carbon atoms, alkoxyalkyl of 2 to 20 carbon atoms, alkanoyl of 1 to 18 carbon atoms, alkoxy of 1 to 18 carbon atoms, cycloalkoxy of 5 to 12 carbon atoms, aryloxy of 6 to 10 carbon atoms, hydroxyalkoxy of 2 to 6 carbon atoms, alkoxyalkoxy of 2 to 20 carbon atoms, aralkoxy of 7 to 15 carbon atoms or bicyclo or tricycloaliphatic oxy radical of 7 to 12 carbon atoms;
• and
• R and R.sub.1 are independently alkyl of 1 to 4 carbon atoms or together R and R.sub.1 are pentamethylene.