Polyalkylpiperidine derivatives of s-triazine

A compound of the formula I or II ##STR29## in which m is an integer from 1 to 4 and n is a value from 2 to 50, X and X' are --O--, --S-- or --NR.sup.6 --, in which R.sup.6 is hydrogen, C.sub.1 -C.sub.18 alkyl, C.sub.3 -C.sub.8 alkenyl, C.sub.1 -C.sub.4 hydroxyalkyl, C.sub.2 -C.sub.13 alkoxyalkyl, C.sub.5 -C.sub.12 cycloalkyl, C.sub.6 -C.sub.10 aryl, C.sub.7 -C.sub.9 phenylalkyl, or a polyalkylpiperidine group of the formula III ##STR30## in which R is hydrogen or methyl, p is 0 or 1, A is C.sub.1 -C.sub.4 -alkylene, --NR.sup.6 --C.sub.2 -C.sub.12 -alkylene- or --OCH.sub.2 CH.sub.2 CH.sub.2 -- and R.sup.7 is H, O, C.sub.1 -C.sub.12 -alkyl, allyl, benzyl or a --CH.sub.2 --CH(R.sup.8)--OH group, in which R.sup.8 is H, CH.sub.3, C.sub.2 H.sub.5 or phenyl, and R.sup.1 and R.sup.3 are hydrogen, C.sub.1 -C.sub.18 alkyl, C.sub.3 -C.sub.8 alkenyl, C.sub.1 -C.sub.4 hydroxyalkyl, C.sub.2 -C.sub.13 alkoxyalkyl, C.sub.5 -C.sub.12 cycloalkyl, C.sub.6 -C.sub.10 aryl, C.sub.7 -C.sub.9 phenylalkyl, phenyl or phenylalkyl which is substituted by one or more substituents from the group consisting of C.sub.1 -C.sub.8 alkyl, OH, C.sub.1 -C.sub.4 alkoxy, and a polyalkylpiperidine group of the formula III, R.sup.2 is hydrogen, C.sub.1 -C.sub.18 alkyl, C.sub.3 -C.sub.8 alkenyl, C.sub.2 -C.sub.6 hydroxyalkyl or C.sub.3 -C.sub.6 alkoxyalkyl, R.sup.4, if m is 1, is hydrogen, C.sub.1 -C.sub.18 alkyl, C.sub.3 -C.sub.8 alkenyl, C.sub.2 -C.sub.4 hydroxyalkyl, C.sub.3 -C.sub.6 alkoxyalkyl, C.sub.6 -C.sub.10 aryl, C.sub.7 -C.sub.9 phenylalkyl, phenyl or phenylalkyl which is substituted by one or more substituents from the group consisting of C.sub.1 -C.sub.8 alkyl, OH, C.sub.1 -C.sub.4 alkoxy, and a polyalkylpiperidine group of the formula III, and, if m is 2, C.sub.2 -C.sub.12 alkylene or oxaalkylene, C.sub.4 -C.sub.12 alkenylene, C.sub.6 -C.sub.10 arylene, a -phenylene-Z-phenylene- radical, in which Z is --O--, --S--, --SO.sub.2 --, --CH.sub.2 -- or --C(CH.sub.3).sub.2 --, or a radical of the formula --(CH.sub.2).sub.r --N(Y)--(CH.sub.2).sub.r --N(Y)].sub.q (CH.sub.2).sub.r --, wherein r is 2 or 3 and q is 0 or 1 and Y is a triazinyl group of the formula IV, ##STR31## and, if m is 3, is a R.sup.8 --C(CH.sub.2 --).sub.3 radical, in which R.sup.8 is C.sub.1 -C.sub.4 alkyl, and, if m is 4, is a C(CH.sub.2 --).sub.4 radical, R.sup.5 is C.sub.2 -C.sub.12 alkylene and E is hydrogen, alkyl or HX--R.sup.5 -- and E' is XH and at least one of the radicals R.sup.1, R.sup.3, R.sup.4, or R.sup.6 is a polyalkylpiperidine of the formula III.