Piperidine derivatives and their use as polymer stabilizers

Claim 1

A stabilized polymer composition comprising a polymer which does not react with hydroxy groups having incorporated therein, in an amount to stabilize it against thermal- and/or photo-deterioration, a piperidine derivative of formula (I): ##STR42## wherein: R 1 represents a hydrogen atom or a methyl group; X represents one of the groups of formula --CH 2 --, ##STR43## wherein: R 2 represents a hydrogen atom, an alkyl group having from 1 to 18 carbon atoms, an allyl group, a benzyl group, an aliphatic, aromatic, araliphatic or alicyclic acyl group having up to 18 carbon atoms, wherein the aromatic moiety is unsubstituted or substituted by one or more C 1 -C 4 alkyl and/or hydroxy groups, or one of the groups of formula ##STR44## wherein: R 9 represents a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms; R 10 represents an alkyl group having from 1 to 18 carbon atoms, a phenyl group which is optionally substituted by one or more methyl and/or chlorine substituents, a naphthyl group or a cyclohexyl group; R 11 represents a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms; and R 12 represents an alkyl group having from 1 to 4 carbon atoms, a phenyl group or a group of formula ##STR45## in which R 13 represents a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms; R 3 and R 4 are the same or different and each represents an alkyl group having from 1 to 4 carbon atoms, or R 3 and R 4 together represent one of the groups of formula ##STR46## in which: R 14 and R 15 are the same or different and each represents a hydrogen atom or an alkyl group having from 1 to 3 carbon atoms; and R 16 and R 17 are the same or different and each represents a hydrogen atom, an alkyl group having from 1 to 3 carbon atoms or a group of formula --CH 2 OR 18 ; in which R 18 represents a hydrogen atom, an alkyl group having from 1 to 4 carbon atoms, an aliphatic, aromatic, araliphatic or alicyclic acyl group having up to 18 carbon atoms, wherein the aryl moiety is optionally substituted by one or more C 1 -C 4 alkyl and/or hydroxy groups, or a group of formula ##STR47## in which R 19 is any one of the groups hereinbefore defined for R 9 and R 20 is any one of the groups hereinbefore defined for R 10 ; R 5 represents an alkyl group having from 1 to 18 carbon atoms, a phenyl group which is optionally substituted by one or more C 1 -C 4 alkyl and/or alkoxy substituents, a benzyl group or a cyclohexyl group; R 6 represents an alkyl group having from 1 to 18 carbon atoms, a benzyl group or an aliphatic, aromatic, araliphatic or alicyclic acyl group having up to 18 carbon atoms, in which the aryl moiety optionally has one or more C 1 -C 4 alkyl and/or hydroxy substituents; or R 5 and R 6 together represent a tetramethylene group, a pentamethylene group or a group of formula --(CH 2 ) 2 --O--(CH 2 ) 2 --; R 7 represents a hydrogen atom, an alkyl group having from 1 to 18 carbon atoms, an allyl group, an acetyl group or a benzyl group; and R 8 represents an alkyl group having from 1 to 18 carbon atoms, an alkenyl group having 3 or 4 carbon atoms, a benzyl group or a group of formula ##STR48## in which: t represents 1, 2 or 3; R 21 represents a hydrogen atom, a methyl group or a phenyl group; R 22 represents a hydrogen atom, an alkyl group having from 1 to 8 carbon atoms, an allyl group, a benzyl group or an aliphatic, aromatic, araliphatic or alicyclic acyl group having up to 18 carbon atoms, wherein the aryl moiety optionally has one or more C 1 -C 4 alkyl and/or hydroxy substituents; and R 23 represents an alkyl group having from 1 to 18 carbon atoms, an alkenyl group having 3 or 4 carbon atoms or a phenyl group; l represents 2 or 3; and when 1=2: Y represents one of the groups of formula --CH 2 CH(OZ)CH 2 -[OCH 2 CH(OZ)CH 2 ] 2 --, --CH 2 CH(OZ)CH 2 -[OCH 2 CH(R 24 )] m --OCH 2 CH(OZ)CH 2 -- and --CH 2 CH(OZ)CH 2 -[OWO--CH 2 CH(OZ)CH 2 ] n --; wherein: m and n each represent integers of from 1 to 10; R 24 represents a hydrogen atom or a methyl group; W represents one of the groups of formulae ##STR49## wherein: p represents 0, 1 or 2; R 25 represents a halogen atom; and q represents an integer of from 1 to 10; and Z represents any one of the groups defined for R 2 ; when l=3: Y represents one of the groups of formula ##STR50## in which Z is as defined above; or an acid addition salt thereof.