| abstract |
Compounds of the formula (I) wherein n is a number from 1 to 20; the radicals R 1 are independently of one another hydrogen, C 1 -C 8 alkyl, -O, -OH, -CH 2 CN, C 1 -C 18 alkoxy, C 5 -C 12 cycloalkoxy, C 3 -C 6 alkenyl, C 7 -C 9 phenylalkyl which is unsubstituted or substituted on the phenyl by 1, 2 or 3 C 1 -C 4 alkyl; or C 1 -C 8 acyl; R 2 has one of the meanings given for R 1 ; X is C 2 -C 10 alkylene; and Y is -O- or >NH; with the proviso that in the individual recurrent units of the formula (I), each of the radicals R 1 , R 2 , X and Y has the same or different definitions; are very effective as light stabilizers, heat stabilizers and oxidation stabilizers for organic materials, in particular synthetic polymers. |