Piperidine derivatives which are stabilizers for synthetic polymers

Claim 1

A compound of the formula ##STR37## or an acid addition salt thereof, in which R 1 represents (a) hydrogen, (b) C 1 -C 12 -alkyl, (c) --CH 2 CN (d) C 3 -C 12 -alkenyl, (e) C 3 -C 12 -alkinyl, (f) benzyl, (g) benzyl substituted by 1 to 3 C 1 -C 4 -alkyl radicals, (h) hydroxybenzyl, (i) hydroxybenzyl substituted by 1 to 3 C 1 -C 4 -alkyl radicals, (j) a --COR 8 , --COOR 8 , --CH 2 COOR 8 or --CONR 8 R 9 radical in which R 8 and R 9 , which may be identical or different, represent (1) linear or branched C 1 -C 12 -alkyl, (2) C 3 -C 12 -alkenyl, (3) C 5 -C 12 -cycloalkyl, (4) phenyl, (5) phenyl substituted by 1 to 3 C 1 -C 8 -alkyl radicals, (6) hydroxyphenyl, (7) hydroxyphenyl substituted by 1 to 3 C 1 -C 8 -alkyl radicals, (8) C 7 -C 12 -aralkyl, or (9) 2,2,6,6-tetramethyl-piperidin-4-yl, (k) a ##STR38## radical, in which R 10 is hydrogen methyl or phenyl and R 11 is hydrogen, --R 8 , --COR 8 or --CONR 8 R 9 , in which R 8 and R 9 are as defined above, or (1) a ##STR39## radical; and A is a radical of the formula ##STR40## in which R 17 and R 18 may be identical or different and represent C 1 -C 12 alkyl, C 5 -C 12 cycloalkyl or a radical of the formula ##STR41## in which R 1 is as defined above, and m and n, which may be identical or different, are integers from 2 to 6, or A is a trivalent radical of a 6-7-membered heterocyclic compound containing 3 nitrogen atoms in the ring, with the free valencies on the three nitrogen atoms.