Polypiperidinyl stabilizing agents for polymer materials

Claim 1

Compounds having the general formula I ##STR19## in which R and R' can be the same or different, and represent hydrogen, a straight-chain or branched-chain alkyl radical having 1 to 12 carbon atoms, an alkenyl radical having 3 to 8 carbon atoms, an aralkyl radical having 7 to 19 carbon atoms; R 1 and R' 1 can be the same or different and represent hydrogen or methyl; X and X' can be the same or different and represent oxygen or the group N--R 2 in which R 2 represents hydrogen, straight-chain or branched-chain alkyl having 1 to 12 carbon atoms, a cycloalkyl radical having 5 to 12 carbon atoms, an aralkyl radical having 7 to 12 carbon atoms; n can be 2 to 12; A represents --(CH 2 ) n --, in which n has the previously defined meaning, the group: ##STR20## in which R 3 and R 4 are hydrogen or methyl, the group ##STR21## the group ##STR22## the group --CH 2 --CH 2 --(O--CH 2 --CH 2 ) a -- in which a can be 1-3; Z represents hydrogen, an alkyl radical having 1 to 18 carbon atoms, a group of formula II ##STR23## in which R, R', R 1 , R' 1 , X, X' and n have the previously defined meaning, or a piperidine group of formula III ##STR24## m can be equal to zero or 1; Y, when m is zero, has the same meaning of A; when m is 1, can have the same meaning of A or represent the following groups ##STR25## --CO--R 6 --CO; --CO--NH--R 7 --NH--CO, --COO--R 8 --OOC--, --H 2 C--R 9 --CO--, in which R 5 represents hydrogen, a straight-chain or branched alkyl radical having 1 to 18 carbon atoms, a cycloalkyl radical having 5 to 12 carbon atoms, an alkenyl radical having 3 to 18 carbon atoms, an optionally substituted aralkyl radical, having 7 to 19 carbon atoms, an aryl radical having 6 to 12 carbon atoms or the ##STR26## O--R 11 , S--R 11 groups, in which R 11 and R 10 can be the same or different and represent hydrogen, a straight-chain or branched alkyl radical having 1 to 18 carbon atoms, a cycloalkyl radical having 5 to 12 carbon atoms, an aralkyl radical having 7 to 12 carbon atoms, an aryl radical having 6 to 12 carbon atoms, R 11 and R 10 together with the nitrogen atom can form a 5 to 7 membered heterocyclic ring; or R 5 represents the piperidine group of formula IV ##STR27## in which R, R 1 and X have the previously defined meaning; R 6 represents a bivalent alkylene radical having 1 to 8 carbon atoms, the phenylene radical; R 7 represents a bivalent alkylene radical having 2 to 6 carbon atoms, the tolylene radical, the xylene radical; R 8 represents a bivalent alkylene radical having 2 to 8 carbon atoms; R 9 represents an alkylene radical having 1 to 2 carbon atoms or a p-phenylene radical; p can vary from 2 to 2000.