Piperidine compounds and their use as stabilizers for synthetic polymers

Claim 1

Compound of formula ##STR20## in which: R 1 represents hydrogen, --0°, --CN, a linear or branched alkyl containing 1 to 20 carbon atoms, an alkenyl or alkinyl containing 2 to 20 carbon atoms, benzyl, benzyl substituted by 1 to 3 alkyls containing 1 to 4 carbon atoms, hydroxybenzyl, hydroxybenzyl substituted by 1 to 3 alkyls containing 1 to 4 carbon atoms; or a --COR 14 , --COOR 14 , --CH 2 COOR 14 or --CONR 14 R 15 radical in which R 14 , R 15 , which can be equal or different, represent a linear or branched alkyl containing 1 to 20 carbon atoms, an alkenyl containing 2 to 20 carbon atoms, a cycloalkyl containing 5 to 12 carbon atoms, phenyl, phenyl substituted by 1 to 3 alkyls containing 1 to 8 carbon atoms, hydroxyphenyl, hydroxyphenyl substituted by 1 to 3 alkyls containing 1 to 4 carbon atoms, an aralkyl containing 7 to 12 carbon atoms, or when bonded to N they can be hydrogen, or together with the N to which they are bonded they can form from five to eight membered nitrogenous containing heterocyclic rings or ##STR21## radical in which R 16 is hydrogen or methyl, and R 17 is --OH, --OR 14 , --OCOR 14 or --CONR 14 R 15 , in which R 14 and R 15 are always as heretofore defined; or a ##STR22## radical; R 2 , R 3 , R 6 , R 7 , which can be equal or different, represent an alkyl containing 1 to 6 C atoms; R 4 , R 5 , which can be equal or different, represent hydrogen or an alkyl containing 1 to 6 C atoms; R 8 , R 9 , R 10 , R 11 , R 12 , R 13 , which can be equal or different, represent hydrogen or an alkyl containing 1 to 6 carbon atoms; n is zero or 1; A represents >C═O, >C═S, or >CH--R 18 in which R 18 is hydrogen, an alkyl containing 1 to 20 carbon atoms, a cycloalkyl containing 5 to 12 carbon atoms, phenyl, a hydroxyphenyl, a hydroxyphenyl substituted by 1 to 3 alkyls containing 1 to 4 carbon atoms, benzyl, or benzyl substituted by 1 to 3 alkyls containing 1 to 4 carbon atoms.