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| - As is known, the above-mentioned U.S. Pat. No. 4,104,248 discloses poly-(2,2,6,6-tetra-alkyl-4-piperidyl)amines having the general formula ##STR1## wherein; each of R1, R2, R3 and R4, which may be the same or different, is an alkyl group having 1 to 4 carbon atoms; R5 is hydrogen or an alkyl group having 1 to 4 carbon atoms; A is an alkylene group having 2 to 10 carbon atoms; B is a divalent aliph
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