Novel light stabilizers for polymers

Claim 1

A compound of the formula (I) ##STR16## wherein W represents C 1 -C 20 alkoxy, or ##STR17## wherein R and R 1 are the same or different and each represent hydrogen, C 1 -C 20 alkyl, or together form a piperidino, pyrrolidyl, or morpholino radical; n is an integer from 1 to 3; and m is an integer from 1 to 6; when m is 1, X and Y are the same or different and each represent chloro, bromo, ##STR18## wherein R and R 1 are as previously defined, C 1 -C 12 alkoxy, C 1 -C 12 alkylthio, ##STR19## wherein n and W are as previously defined, or the radicals (II) or (III) ##STR20## wherein R 2 represents hydrogen, C 1 -C 8 alkyl, or benzyl; R 3 and R 4 independently represent C 1 -C 8 alkyl, benzyl, or phenethyl, or together with the carbon to which they are attached form a C 5 -C 10 cycloalkyl; R 5 represents hydrogen, C 2 -C 3 hydroxyalkyl, C 1 -C 8 alkyl, hydroxyl, or oxyl; R 6 represents hydrogen, C 1 -C 20 alkyl, or the radical (IV) ##STR21## wherein R 2 , R 3 , R 4 , and R 5 are as previously defined; with the proviso that at least one X or Y, must contain a piperidinyl moiety (IV); and when m is an integer from 2 to 6, X is as previously defined; Y is an m-valent radical derived from a polyamine, polyalcohol, or polymercaptan containing a C 2 -C 20 alkylene chain, either straight-chained or branched, wherein the alkylene chain may be interrupted by oxy, thio, or ##STR22## wherein R 7 represents hydrogen, C 1 -C 20 alkyl, or the moiety (IV); C 5 -C 10 cycloalkylene, ##STR23## C 6 -C 12 arylene; or C 8 -C 14 arylenedialkylene; with the proviso that at least one piperidinyl moiety (IV) is present in X or Y.