Polytriazine derivatives containing polyalkylpiperidinyloxy or polyalkylpiperidinylamino groups

Abstract

Compounds of the formula (I) ##STR1## wherein n is a number from 1 to 20;the radicals R.sub.1 are independently of one another hydrogen, C.sub.1 -C.sub.8 alkyl, --O, --OH, --CH.sub.2 CN, C.sub.1 -C.sub.18 alkoxy, C.sub.5 -C.sub.12 cycloalkoxy, C.sub.3 -C.sub.6 alkenyl, C.sub.7 -C.sub.9 phenylalkyl which is unsubstituted or substituted on the phenyl by 1, 2 or 3 C.sub.1 -C.sub.4 alkyl; or C.sub.1 -C.sub.8 acyl;R.sub.2 has one of the meanings given for R.sub.1 ;X is C.sub.2 -C.sub.10 alkylene; andY is --O-- or >NH;with the proviso that in the individual recurrent units of the formula (I), each of the radicals R.sub.1, R.sub.2, X and Y has the same or different definitions;are very effective as light stabilizers, heat stabilizers and oxidation stabilizers for organic materials, in particular synthetic polymers.

Description

The present invention relates to polytriazine derivatives containing polyalkylpiperidinyloxy or polyalkylpiperidinylamino groups, to the use thereof for stabilizing organic materials, in particular synthetic polymers, against degradation induced by light, heat or oxidation and to the organic materials thus stabilized.

The use of polytriazine derivatives containing polyalkylpiperidinyl groups as stabilizers for organic materials is for example described in US-A-4 086 204, US-A-4 108 829, US-A-4 331 586, US-A-4 335 242, US-A-4 816 507, US-A-4 997 938, EP-A-357 223, EP-A-479 724, EP-A-601 978 and EP-A-659 750.

In US-A-4 442 250, the use of macrocyclic triazine compounds containing polyalkylpiperidinyl groups and the stabilizing activity therof is disclosed.

The present invention relates to a compound of the formula (I) ##STR2## wherein n is a number from 1 to 20;

the radicals R.sub.1 are independently of one another hydrogen, C.sub.1 -C.sub.8 alkyl, --O, --OH, --CH.sub.2 CN, C.sub.1 -C.sub.18 alkoxy, C.sub.5 -C.sub.12 cycloalkoxy, C.sub.3 -C.sub.6 alkenyl, C.sub.7 -C.sub.9 phenylalkyl which is unsubstituted or substituted on the phenyl by 1, 2 or 3 C.sub.1 -C.sub.4 alkyl; or C.sub.1 -C.sub.8 acyl; R.sub.2 has one of the meanings given for R.sub.1 ; X is C.sub.2 -C.sub.10 alkylene; and Y is --O-- or >NH; with the proviso that in the individual recurrent units of the formula (I), each of the radicals R.sub.1, R.sub.2, X and Y has the same or different definitions.

Examples of alkyl containing not more than 8 carbon atoms are methyl, ethyl, propyl, isopropyl, butyl, 2-butyl, isobutyl, t-butyl, pentyl, 2-pentyl, hexyl, heptyl and octyl. One of the preferred meanings of R.sub.1 and R.sub.2 is C.sub.1 -C.sub.4 alkyl, in particular methyl.

Examples of alkoxy containing not more than 18 carbon atoms are methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, pentoxy, isopentoxy, hexoxy, heptoxy, octoxy, decyloxy, dodecyloxy, tetradecyloxy, hexadecyloxy and octadecyloxy. C.sub.6 -C.sub.12 Alkoxy, in particular heptoxy and octoxy, is preferred.

Examples of C.sub.5 -C.sub.12 cycloalkoxy are cyclopentoxy, cyclohexoxy, cycloheptoxy, cyclooctoxy, cyclodecyloxy and cyclododecyloxy. C.sub.5 -C.sub.8 Cycloalkoxy, in particular cyclopentoxy and cyclohexoxy, is preferred.

Examples of C.sub.3 -C.sub.6 alkenyl are allyl, 2-methylallyl, butenyl and hexenyl. Alkenyls in which the carbon atom in the 1-position is saturated are preferred, and allyl is particularly preferred.

Examples of C.sub.7 -C.sub.9 phenylalkyl which is unsubstituted or substituted on the phenyl by 1, 2 or 3 C.sub.1 -C.sub.4 alkyl are benzyl, methylbenzyl, dimethylbenzyl, trimethylbenzyl, t-butylbenzyl and 2-phenylethyl. Benzyl is preferred.

Examples of C.sub.1 -C.sub.8 acyl are formyl, acetyl, propionyl, butyryl, pentanoyl, hexanoyl, heptanoyl, octanoyl and benzoyl. C.sub.1 -C.sub.8 Alkanoyl and benzoyl are preferred. Acetyl is especially preferred.

Examples of C.sub.2 -C.sub.10 alkylene are ethylene, propylene, trimethylene, 2-methyltrimethylene, 2,2-dimethyltrimethylene, tetramethylene, pentamethylene, hexamethylene, trimethylhexamethylene, octamethylene and decamethylene. X is preferably C.sub.2 -C.sub.6 alkylene, in particular hexylene.

The variable n may be for example a number from 2 to 20 or 3 to 20.

In the individual recurrent structural units of the formula (I), each of the radicals R.sub.1, R.sub.2, X and Y has preferably the same definition.

The radicals R.sub.1 are preferably identical.

Preferred compounds of the formula (I) are those wherein the radicals R.sub.1 are independently of one another hydrogen, C.sub.1 -C.sub.4 alkyl, --OH, C.sub.6 -C.sub.12 alkoxy, C.sub.5 -C.sub.8 cycloalkoxy, allyl, benzyl or acetyl, in particular hydrogen or C.sub.1 -C.sub.4 alkyl; and R.sub.2 has one of the meanings given for R.sub.1.

Particularly preferred compounds of the formula (I) are those wherein the radicals R.sub.1 are identical and are hydrogen, methyl or cyclohexyloxy; R.sub.2 has one of the meanings given for R.sub.1 ; and X is C.sub.2 -C.sub.6 alkylene; with the proviso that in the individual recurrent units of the formula (I), each of the radicals R.sub.1, R.sub.2, X and Y has the same definitions.

Compounds of the formula (I) of special interest are those wherein the radicals R.sub.1 are identical and are hydrogen or methyl; and R.sub.2 has one of the meanings given for R.sub.1.

Y is preferably --O--.

The compounds of the formula (I) may be prepared for example in analogy to the method described in US-A-4 086 204 by reacting a compound of the formula (II) ##STR3## with a compound of the formula (III) ##STR4## wherein R.sub.1, R.sub.2, X and Y have the meanings given above in an appropriate molar ratio, in particular a stoichiometric ratio.

The reaction is preferably carried out in an inert organic solvent such as dioxane, toluene, xylene, trimethylbenzene, t-amyl alcohol, 1 ,2-dichloroethane or mixtures of the aforementioned solvents at a temperature of e.g. 20.degree. C. to 180.degree. C. A temperature of 60.degree. C. to 150.degree. C. is preferred. Furthermore, the reaction is conveniently carried out in the presence of an organic or inorganic base such as triethylamine, triisopropylamine, tributylamine, sodium hydroxide, sodium carbonate, potassium hydroxide or potassium carbonate.

The compounds of the formula (II) can be obtained, for example, directly from cyanuric chloride and the appropriate 4-hydroxypiperidine derivative or 4-aminopiperidine derivative in an inert organic solvent such as toluene, xylene or trimethylbenzene in the presence of isopropanol, isobutanol or isoamylalcohol at a molar ratio with regard to the 4-hydroxypiperidine derivative or 4-aminopiperidine derivative of e.g. 1.3:1 to 1:1. Isopropanol and the molar ratio of 1.2:1 are preferred.

The reaction is conveniently carried out at a temperature of 0.degree. C. to 60.degree. C., in particular 30.degree. C. to 60.degree. C.

The compounds of the formula (II) wherein Y is --O-- can also be obtained, for example, from cyanuric chloride and a compound of the formula (IV) ##STR5## wherein R.sub.2 has the meanings given above and M is an alkaline metal such as lithium, sodium or potassium, at the appropriate molar ratio in an inert organic solvent such as toluene, xylene or trimethylbenzene at a temperature of -20.degree. C. to 70.degree. C., preferably 0.degree. C. to 60.degree. C.

A further example for the preparation of the compounds of the formula (I) is the reaction of cyanuric chloride with a compound of the formula (III) in the appropriate molar ratio, preferably in the stoichiometric ratio, to obtain a compound of the formula (V) ##STR6## wherein n, R.sub.1 and X have the definitions given above. The polytriazine of the formula (V) is conveniently reacted with the appropriate 4-aminopiperidine derivative or with a compound of the formula (VI) ##STR7## wherein R.sub.2 has the meanings given above and L is hydrogen or an alkaline metal such as lithium , sodium or potassium.

The reaction is preferably carried out in an inert organic solvent, for example toluene, xylene or trimethylbenzene. When L is hydrogen, the reaction is conveniently carried out in the presence of a base, in particular an inorganic base such as sodium or potassium hydroxide or carbonate. The reaction temperature is for example 60.degree. C. to 180.degree. C., preferably 100.degree. C. to 180.degree. C.

The compounds of the formula (IV) and (VI) wherein M and L are an alkaline metal may be obtained, for example, by treating the appropriate 4-hydroxypiperidine derivative with an alkaline alcoholate or an alkaline metal in an inert organic solvent such as toluene, xylene or trimethylbenzene at reflux temperature, simultaneously distilling off the alcohol formed during the reaction.

The starting materials used in the above preparations are known and can be prepared according to known methods, if not commercially available

During the preparation of the compounds of the formula (I), a macrocyclic compound of the fomula ##STR8## wherein R.sub.1, R.sub.2, X and Y are as defined above may be formed as a by-product in an amount of e.g. up to 20%. This by-product can be separated from the reaction mixture by usual methods such as e.g. filtration and so on.

The indicated by-product is also useful as light stabilizer, heat stabilizer and oxidation stabilizer for organic materials.

The compounds of the formula (I) are very effective in improving the light, heat and oxidation resistance of organic materials, especially synthetic polymers and copolymers.

Examples of organic materials which can be stabilized are:

1. Polymers of monoolefins and diolefins, for example polypropylene, polyisobutylene, polybut-1-ene, poly-4-methylpent-1-ene, polyisoprene or polybutadiene, as well as polymers of cycloolefins, for instance of cyclopentene or norbornene, polyethylene (which optionally can be crosslinked), for example high density polyethylene (HDPE), high density and high molecular weight polyethylene (HDPE-HMW), high density and ultrahigh molecular weight polyethylene (HDPE-UHMW), medium density polyethylene (MDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), branched low density polyethylene (BLDPE). Polyolefins, i.e. the polymers of monoolefins exemplified in the preceding paragraph, preferably polyethylene and polypropylene, can be prepared by different, and especially by the following, methods: a) radical polymerisation (normally under high pressure and at elevated temperature). b) catalytic polymerisation using a catalyst that normally contains one or more than one metal of groups IVb, Vb, VIb or VII of the Periodic Table. These metals usually have one or more than one ligand, typically oxides, halides, alcoholates, esters, ethers, amines, alkyls, alkenyls and/or aryls that may be either .pi.- or .sigma.-coordinated. These metal complexes may be in the free form or fixed on substrates, typically on activated magnesium chloride, titanium(III) chloride, alumina or silicon oxide. These catalysts may be soluble or insoluble in the polymerisation medium. The catalysts can be used by themselves in the polymerisation or further activators may be used, typically metal alkyls, metal hydrides, metal alkyl halides, metal alkyl oxides or metal alkyloxanes, said metals being elements of groups Ia, IIa and/or IIIa of the Periodic Table. The activators may be modified conveniently with further ester, ether, amine or silyl ether groups. These catalyst systems are usually termed Phillips, Standard Oil Indiana, Ziegler (-Natta), TNZ (DuPont), metallocene or single site catalysts (SSC). 2. Mixtures of the polymers mentioned under 1), for example mixtures of polypropylene with polyisobutylene, polypropylene with polyethylene (for example PP/HDPE, PP/LDPE) and mixtures of different types of polyethylene (for example LDPE/HDPE). 3. Copolymers of monoolefins and diolefins with each other or with other vinyl monomers, for example ethylene/propylene copolymers, linear low density polyethylene (LLDPE) and mixtures thereof with low density polyethylene (LDPE), propylene/but-1-ene copolymers, propylene/isobutylene copolymers, ethylene/but-1 -ene copolymers, ethylene/hexene copolymers, ethylene/methylpentene copolymers, ethylene/heptene copolymers, ethylene/octene copolymers, propylene/butadiene copolymers, isobutylene/isoprene copolymers, ethylene/alkyl acrylate copolymers, ethylene/alkyl methacrylate copolymers, ethylene/vinyl acetate copolymers and their copolymers with carbon monoxide or ethylene/acrylic acid copolymers and their salts (ionomers) as well as terpolymers of ethylene with propylene and a diene such as hexadiene, dicyclopentadiene or ethylidene-norbornene; and mixtures of such copolymers with one another and with polymers mentioned in 1) above, for example polypropylene/ethylene-propylene copolymers, LDPE/ethylene-vinyl acetate copolymers (EVA), LDPE/ethylene-acrylic acid copolymers (EAA), LLDPE/EVA, LLDPE/EAA and alternating or random polyalkylene/carbon monoxide copolymers and mixtures thereof with other polymers, for example polyamides. 4. Hydrocarbon resins (for example C.sub.5 -C.sub.9) including hydrogenated modifications thereof (e.g. tackifiers) and mixtures of polyalkylenes and starch. 5. Polystyrene, poly(p-methylstyrene), poly(.alpha.-methylstyrene). 6. Copolymers of styrene or .alpha.-methylstyrene with dienes or acrylic derivatives, for example styrene/butadiene, styrene/acrylonitrile, styrene/alkyl methacrylate, styrene/butadiene/alkyl acrylate, styrene/butadiene/alkyl methacrylate, styrene/maleic anhydride, styrene/acrylonitrile/methyl acrylate; mixtures of high impact strength of styrene copolymers and another polymer, for example a polyacrylate, a diene polymer or an ethylene/propylene/diene terpolymer; and block copolymers of styrene such as styrene/butadiene/styrene, styrene/isoprene/styrene, styrene/ethylene/butylene/styrene or styrene/ethylene/propylene/styrene. 7. Graft copolymers of styrene or (.alpha.-methylstyrene, for example styrene on polybutadiene, styrene on polybutadiene-styrene or polybutadiene-acrylonitrile copolymers; styrene and acrylonitrile (or methacrylonitrile) on polybutadiene; styrene, acrylonitrile and methyl methacrylate on polybutadiene; styrene and maleic anhydride on polybutadiene; styrene, acrylonitrile and maleic anhydride or maleimide on polybutadiene; styrene and maleimide on polybutadiene; styrene and alkyl acrylates or methacrylates on polybutadiene; styrene and acrylonitrile on ethylene/propylene/diene terpolymers; styrene and acrylonitrile on polyalkyl acrylates or polyalkyl methacrylates, styrene and acrylonitrile on acrylate/butadiene copolymers, as well as mixtures thereof with the copolymers listed under 6), for example the copolymer mixtures known as ABS, MBS, ASA or AES polymers. 8. Halogen-containing polymers such as polychloroprene, chlorinated rubbers, chlorinated and brominated copolymer of isobutylene-isoprene (halobutyl rubber), chlorinated or sulfochlorinated polyethylene, copolymers of ethylene and chlorinated ethylene, epichlorohydrin homo- and copolymers, especially polymers of halogen-containing vinyl compounds, for example polyvinyl chloride, polyvinylidene chloride, polyvinyl fluoride, polyvinylidene fluoride, as well as copolymers thereof such as vinyl chloride/vinylidene chloride, vinyl chloride/vinyl acetate or vinylidene chloride/vinyl acetate copolymers. 9. Polymers derived from .alpha.,.beta.-unsaturated acids and derivatives thereof such as polyacrylates and polymethacrylates; polymethyl methacrylates, polyacrylamides and polyacrylonitriles, impact-modified with butyl acrylate. 10. Copolymers of the monomers mentioned under 9) with each other or with other unsaturated monomers, for example acrylonitrile/butadiene copolymers, acrylonitrile/alkyl acrylate copolymers, acrylonitrile/alkoxyalkyl acrylate or acrylonitrile/vinyl halide copolymers or acrylonitrile/alkyl methacrylate/butadiene terpolymers. 11. Polymers derived from unsaturated alcohols and amines or the acyl derivatives or acetals thereof, for example polyvinyl alcohol, polyvinyl acetate, polyvinyl stearate, polyvinyl benzoate, polyvinyl maleate, polyvinyl butyral, polyallyl phthalate or polyallyl melamine; as well as their copolymers with olefins mentioned in 1) above. 12. Homopolymers and copolymers of cyclic ethers such as polyalkylene glycols, polyethylene oxide, polypropylene oxide or copolymers thereof with bisglycidyl ethers. 13. Polyacetals such as polyoxymethylene and those polyoxymethylenes which contain ethylene oxide as a comonomer; polyacetals modified with thermoplastic polyurethanes, acrylates or MBS. 14. Polyphenylene oxides and sulfides, and mixtures of polyphenylene oxides with styrene polymers or polyamides. 15. Polyurethanes derived from hydroxyl-terminated polyethers, polyesters or polybutadienes on the one hand and aliphatic or aromatic polyisocyanates on the other, as well as precursors thereof. 16. Polyamides and copolyamides derived from diamines and dicarboxylic acids and/or from aminocarboxylic acids or the corresponding lactams, for example polyamide 4, polyamide 6, polyamide 6/6, 6/10, 6/9, 6/12, 4/6, 12/12, polyamide 11, polyamide 12, aromatic polyamides starting from m-xylene diamine and adipic acid; polyamides prepared from hexamethylenediamine and isophthalic or/and terephthalic acid and with or without an elastomer as modifier, for example poly-2,4,4,-trimethylhexamethylene terephthalamide or poly-m-phenylene isophthalamide; and also block copolymers of the aforementioned polyamides with polyolefins, olefin copolymers, ionomers or chemically bonded or grafted elastomers; or with polyethers, e.g. with polyethylene glycol, polypropylene glycol or poly tetramethylene glycol; as well as polyamides or copolyamides modified with EPDM or ABS; and polyamides condensed during processing (RIM polyamide systems). 17. Polyureas, polyimides, polyamide-imides, polyetherimids, polyesterimids, polyhydantoins and polybenzimidazoles. 18. Polyesters derived from dicarboxylic acids and diols and/or from hydroxycarboxylic acids or the corresponding lactones, for example polyethylene terephthalate, polybutylene terephthalate, poly-1,4-dimethylolcyclohexane terephthalate and polyhydroxybenzoates, as well as block copolyether esters derived from hydroxyl-terminated polyethers; and also polyesters modified with polycarbonates or MBS. 19. Polycarbonates and polyester carbonates. 20. Polysulfones, polyether sulfones and polyether ketones. 21. Crosslinked polymers derived from aldehydes on the one hand and phenols, ureas and melamines on the other hand, such as phenol/formaldehyde resins, urea/formaldehyde resins and melamine/formaldehyde resins. 22. Drying and non-drying alkyd resins. 23. Unsaturated polyester resins derived from copolyesters of saturated and unsaturated dicarboxylic acids with polyhydric alcohols and vinyl compounds as crosslinking agents, and also halogen-containing modifications thereof of low flammability. 24. Crosslinkable acrylic resins derived from substituted acrylates, for example epoxy acrylates, urethane acrylates or polyester acrylates. 25. Alkyd resins, polyester resins and acrylate resins crosslinked with melamine resins, urea resins, isocyanates, isocyanurates, polyisocyanates or epoxy resins. 26. Crosslinked epoxy resins derived from aliphatic, cycloaliphatic, heterocyclic or aromatic glycidyl compounds, e.g. products of diglycidyl ethers of bisphenol A and bisphenolF, which are crosslinked with customary hardeners such as anhydrides or amines, with or without accelerators. 27. Natural polymers such as cellulose, rubber, gelatin and chemically modified homologous derivatives thereof, for example cellulose acetates, cellulose propionates and cellulose butyrates, or the cellulose ethers such as methyl cellulose; as well as rosins and their derivatives. 28. Blends of the aforementioned polymers (polyblends), for example PP/EPDM, Polyamide/EPDM or ABS, PVC/EVA, PVC/ABS, PVC/MBS, PC/ABS, PBTP/ABS, PC/ASA, PC/PBT, PVC/CPE, PVC/acrylates, POM/thermoplastic PUR, PC/thermoplastic PUR, POM/acrylate, POM/WMBS, PPO/HIPS, PPO/PA 6.6 and copolymers, PA/HDPE, PA/PP, PA/PPO, PBT/PC/ABS or PBT/PET/PC. 29. Naturally occurring and synthetic organic materials which are pure monomeric compounds or mixtures of such compounds, for example mineral oils, animal and vegetable fats, oil and waxes, or oils, fats and waxes based on synthetic esters (e.g. phthalates, adipates, phosphates or trimellitates) and also mixtures of synthetic esters with mineral oils in any weight ratios, typically those used as spinning compositions, as well as aqueous emulsions of such materials. 30. Aqueous emulsions of natural or synthetic rubber, e.g. natural latex or latices of carboxylated styrene/butadiene copolymers.

The invention thus also relates to a composition comprising an organic material susceptible to oxidative, thermal or light-induced degradation and at least one compound of the formula (I).

The organic material is preferably a synthetic polymer, more particularly one selected from the aforementioned groups. Polyolefins are preferred and polyethylene and polypropylene are particularly preferred.

A further embodiment of the instant invention is a method for stabilizing an organic material against degradation induced by light, heat or oxidation, which comprises incorporating into said organic material at least one compound of the formula (I).

The compounds of the formula (I) can be used in various proportions depending on the nature of the material to be stabilized, on the end use and on the presence of other additives.

In general, it is appropriate to use, for example, 0.01 to 5% by weight of the compounds of the formula (I), relative to the weight of the material to be stabilized, preferably 0.05 to 1%.

The compounds of the formula (I) can be added, for example, to the polymeric materials before, during or after the polymerization or crosslinking of the said materials. Furthermore, they can be incorporated in the polymeric materials in the pure form or encapsulated in waxes, oils or polymers.

In general, the compounds of the formula (I) can be incorporated in the polymeric materials by various processes, such as dry mixing in the form of powder, or wet mixing in the form of solutions or suspensions or also in the form of a masterbatch; in such operations, the polymer can be used in the form of powder, granules, solutions, suspensions or in the form of latices.

The materials stabilized with the compounds of the formula (I) can be used for the production of mouldings, films, tapes, monofilaments, fibres, surface coatings and the like.

If desired, other conventional additives for synthetic polymers, such as antioxidants, UV absorbers, nickel stabilizers, pigments, fillers, plasticizers, corrosion inhibitors and metal deactivators, can be added to the organic materials containing the compounds of the formula (I).

Particular examples of said conventional additives are:

1. Antioxidants 1.1. Alkylated monophenols, for example 2,6-di-tert-butyl-4-methylphenol, 2-tert-butyl-4,6-dimethylphenol, 2,6-di-tert-butyl-4-ethylphenol, 2,6-di-tert-butyl-4-n-butylphenol, 2,6-di-tert-butyl-4-isobutylphenol, 2,6-dicyclopentyl-4-methylphenol, 2-(.alpha.-methylcyclohexyl)-4,6-di-methylphenol, 2,6-dioctadecyl-4-methylphenol, 2,4,6-tricyclohexylphenol, 2,6-di-tert-butyl-4-methoxymethylphenol, nonylphenols which are linear or branched in the side chains, for example, 2,6-di-nonyl-4-methylphenol, 2,4-dimethyl-6-(1'-methylundec-1'-yl)phenol, 2,4-dimethyl-6-(1'-methylheptadec-1'-yl)phenol, 2,4-dimethyl-6-(1'-methyltridec-1'-yl)phenol and mixtures thereof. 1.2. Alkylthiomethylphenols, for example 2,4-dioctylthiomethyl-6-tert-butylphenol, 2,4-di-octylthiomethyl-6-methylphenol, 2,4-dioctylthiomethyl-6-ethylphenol, 2, 6-di-dodecylthio-methyl-4-nonylphenol. 1.3. Hydroquinones and alkylated hydroquinones, for example 2,6-di-tert-butyl-4-methoxyphenol, 2,5-di-tert-butylhydroquinone, 2,5-di-tert-amylhydroquinone, 2,6-diphenyl-4-octa-decyloxyphenol, 2,6-di-tert-butylhydroquinone, 2,5-di-tert-butyl-4-hydroxyanisole, 3,5-di-tert-butyl-4-hydroxyanisole, 3,5-di-tert-butyl-4-hydroxyphenyl stearate, bis-(3,5-di-tert-butyl-4-hydroxyphenyl) adipate. 1.4. Tocopherols, for example .alpha.-tocopherol, .beta.-tocopherol, .gamma.-tocopherol, .delta.-tocopherol and mixtures thereof (Vitamin E). 1.5. Hydroxylated thiodiphenyl ethers, for example 2,2'-thiobis(6-tert-butyl-4-methylphenol), 2,2'-thiobis(4-octylphenol), 4,4'-thiobis(6-tert-butyl-3-methylphenol), 4,4'-thiobis (6-tert-butyl-2-methylphenol), 4,4'-thiobis-(3,6-di-sec-amylphenol), 4,4'-bis-(2,6-dimethyl-4-hydroxyphenyl) disulfide. 1.6. Alkylidenebisphenols, for example 2,2'-methylenebis(6-tert-butyl-4-methylphenol), 2,2'-methylenebis(6-tert-butyl-4-ethylphenol), 2,2'-methylenebis�4-methyl-6-(.alpha.-methylcyclohexyl)-phenol!, 2,2'-methylenebis(4-methyl-6-cyclohexylphenol), 2,2'-methylenebis(6-nonyl-4-methylphenol), 2,2'-methylenebis(4,6-di-tert-butylphenol), 2,2'-ethylidenebis(4,6-di-tert-butylphenol), 2,2'-ethylidenebis(6-tert-butyl-4-isobutylphenol), 2,2'-methylenebis�6-(.alpha.-methylbenzyl)-4-nonylphenol!, 2,2'-methylenebis�6-(.alpha.,.alpha.-dimethylbenzyl)-4-nonylphenol!, 4,4'-methylenebis(2,6-di-tert-butylphenol), 4,4'-methylenebis(6-tert-butyl-2-methylphenol), 1,1 -bis(5-tert-butyl-4-hydroxy-2-methylphenyl)butane, 2,6-bis(3-tert-butyl-5-methyl-2-hydroxybenzyl)-4-methylphenol, 1,1,3-tris(5-tert-butyl-4-hydroxy-2-methylphenyl)butane, 1,1 -bis(5-tert-butyl-4-hydroxy-2-methyl-phenyl)-3-n-dodecylmercaptobutane, ethylene glycol bis�3,3-bis(3'-tert-butyl-4'-hydroxyphenyl)butyrate!, bis(3-tert-butyl-4-hydroxy-5-methyl-phenyl)dicyclopentadiene, bis�2-(3'-tert-butyl-2'-hydroxy-5'-methylbenzyl)-6-tert-butyl-4-methylphenyl!terephthalate, 1,1-bis-(3,5-dimethyl-2-hydroxyphenyl)butane, 2,2-bis-(3,5-di-tert-butyl-4-hydroxyphenyl) propane, 2,2-bis-(5-tert-butyl-4-hydroxy2-methylphenyl)-4-n-dodecylmercaptobutane, 1,1,5,5-tetra-(5-tert-butyl-4-hydroxy2-methylphenyl)pentane. 1.7. O--, N--and S--benzyl compounds, for example 3,5,3',5'-tetra-tert-butyl-4,4'-dihydroxydibenzyl ether, octadecyl-4-hydroxy-3,5-dimethylbenzylmercaptoacetate, tridecyl-4-hydroxy-3,5-di-tert-butylbenzylmercaptoacetate, tris(3,5-di-tert-butyl-4-hydroxybenzyl)amine, bis(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)dithioterephthalate, bis(3,5-di-tert-butyl-4-hydroxy-benzyl)sulfide, isooctyl-3,5di-tert-butyl-4-hydroxybenzylmercaptoacetate. 1.8. Hydroxybenzylated malonates, for example dioctadecyl-2,2-bis-(3,5-di-tert-butyl-2-hydroxybenzyl)-malonate, di-octadecyl-2-(3-tert-butyl-4-hydroxy-5-methylbenzyl)-malonate, di-dodecylmercaptoethyl-2,2-bis-(3,5-di-tert-butyl-4-hydroxybenzyl)malonate, bis�4-(1,1,3,3-tetramethylbutyl)phenyl!-2,2-bis(3,5-di-tert-butyl-4-hydroxybenzyl)malonate. 1.9. Aromatic hydroxybenzyl compounds, for example 1,3,5-tris-(3,5-di-tert-butyl-4-hydroxy-benzyl)-2,4,6-trimethylbenzene, 1,4-bis(3,5-di-tert-butyl-4-hydroxybenzyl)-2,3,5,6-tetra-methylbenzene, 2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)phenol. 1.10. Triazine Compounds, for example 2,4-bis(octylmercapto)-6-(3,5-di-tert-butyl-4-hydroxyanilino)-1,3,5-triazine, 2-octylmercapto-4,6-bis(3,5-di-tert-butyl-4-hydroxyanilino)-1,3,5-triazine, 2-octylmercapto-4,6-bis(3,5-di-tert-butyl-4-hydroxyphenoxy)-1,3,5-triazine, 2,4,6-tris(3,5-di-tert-butyl-4-hydroxyphenoxy)-1,2,3-triazine, 1,3,5-tris-(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate, 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)-isocyanurate, 2,4,6-tris(3,5-di-tert-butyl-4-hydroxyphenylethyl)-1,3,5-triazine, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)-hexahydro-1,3,5-triazine, 1,3,5-tris(3,5-dicyclohexyl-4-hydroxybenzyl)isocyanurate. 1.11. Benzylphosphonates, for example dimethyl-2,5-di-tert-butyl-4-hydroxybenzylphosphonate, diethyl-3,5-di-tert-butyl-4-hydroxybenzylphosphonate, dioctadecyl3,5-di-tert-butyl-4-hydroxybenzylphosphonate, dioctadecyl-5-tert-butyl-4-hydroxy3-methylbenzylphosphonate, the calcium salt of the monoethyl ester of 3,5-di-tert-butyl-4-hydroxybenzylphosphonic acid. 1.12. Acylaminophenols, for example 4-hydroxylauranilide, 4-hydroxystearanilide, octyl N-(3,5-di-tert-butyl-4-hydroxyphenyl)carbamate. 1.13. Esters of .beta.-(3.5-di-tert-butyl-4-hydroxyphenyl)propionic acid with mono- or polyhydric alcohols, e.g. with methanol, ethanol, n-octanol, i-octanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol, 1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris(hydroxyethyl) isocyanurate, N,N'-bis(hydroxyethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo�2.2.2!octane. 1.14. Esters of .beta.-(5-tert-butyl-4-hydroxy-3-methylphenyl)propionic acid with mono- or polyhydric alcohols, e.g. with methanol, ethanol, n-octanol, i-octanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol, 1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris(hydroxyethyl) isocyanurate, N,N'-bis(hydroxyethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo�2.2.2!octane. 1.15. Esters of .beta.-(3,5-dicyclohexyl-4-hydroxyphenyl)propionic acid with mono- or polyhydric alcohols, e.g. with methanol, ethanol, octanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol, 1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris(hydroxyethyl)isocyanurate, N,N'-bis(hydroxyethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo�2.2.2!octane. 1.16. Esters of 3.5-di-tert-butyl-4-hydroxyphenyl acetic acid with mono- or polyhydric alcohols, e.g. with methanol, ethanol, octanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol, 1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris(hydroxyethyl)isocyanurate, N,N'-bis(hydroxyethyl)-oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl-1 -phospha-2,6,7-trioxabicyclo�2.2.2!octane. 1.17. Amides of .beta.-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid e.g. N,N'-bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)hexamethylenediamine, N,N'-bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl) trimethylenediamine, N,N'-bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)-hydrazine. 1.18. Ascorbic acid (vitamin C) 1.19. Aminic antioxidants, for example N,N'-di-isopropyl-p-phenylenediamine, N,N'-di-sec-butyl-p-phenylenediamine, N,N'-bis(1,4-dimethylpentyl)-p-phenylenediamine, N,N'-bis(1-ethyl-3-methylpentyl)-p-phenylenediamine, N,N'-bis(1-methylheptyl)-p-phenylenediamine, N,N'-dicyclohexyl-p-phenylenediamine, N, N'-diphenyl-p-phenylenediamine, N, N'-bis(2-naphthyl)-p-phenylenediamine, N-isopropyl-N'-phenyl-p-phenylenediamine, N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine, N-(1-methylheptyl)-N'-phenyl-p-phenylenediamine, N-cyclohexyl-N'-phenyl-p-phenylenediamine, 4-(p-toluenesulfamoyl)diphenylamine, N,N'-dimethyl-N,N'-di-sec-butyl-p-phenylenediamine, diphenylamine, N-allyldiphenylamine, 4-isopropoxy-diphenylamine, N-phenyl-1-naphthylamine, N-(4-tert-octylphenyl)-1-naphthylamine, N-phe-nyl-2-naphthylamine, octylated diphenylamine, for example p,p'-di-tert-octyldiphenylamine, 4-n-butylaminophenol, 4-butyrylaminophenol, 4-nonanoylamino-phenol, 4-dodecanoylaminophenol, 4-octadecanoylaminophenol, bis(4-methoxyphenyl)amine, 2,6-di-tert-butyl-4-dimethylaminomethylphenol, 2,4'-diaminodiphenylmethane, 4,4'-diaminodiphenylmethane, N,N,N',N'-tetramethyl-4,4'-diaminodiphenylmethane, 1,2-bis�(2-methylphenyl)amino!ethane, 1,2-bis(phenylamino)propane, (o-tolyl)biguanide, Bis�4-(1 ',3'-dimethylbutyl)phenyl!amine, tert-octylated N-phenyl-1-naphthylamine, a mixture of mono- and dialkylated tert-butyl/tert-octyldiphenylamines, a mixture of mono- and dialkylated nonyldiphenylamines, a mixture of mono- and dialkylated dodecyldiphenylamines, a mixture of mono- and dialkylated isopropyl/isohexyldiphenylamines, a mixture of mono- und dialkylated tert-butyldiphenylamines, 2,3-dihydro-3,3-dimethyl-4H-1,4-benzothiazine, phenothiazine, a mixture of mono- und dialkylated tert-butyl/tert-octylphenothiazines, a mixture of mono- und dialkylated tert-octyl-phe-nothiazines, N-allylphenothiazin, N,N,N',N'-tetraphenyl-1,4-diaminobut-2-ene, N,N-bis-(2,2,6,6-tetramethyl-piperid-4-yl-hexamethylenediamine, bis(2,2,6,6-tetramethylpiperid-4-yl)sebacate, 2,2,6,6-tetramethylpiperidin-4-one, 2,2,6,6-tetramethylpiperidin-4-ol. 2. UV absorbers and light stabilisers 2.1. 2-(2'-Hydroxyphenyl)benzotriazoles, for example 2-(2'-hydroxy-5'-methylphenyl)-benzo-triazole, 2-(3',5'-di-tert-butyl-2'-hydroxyphenyl)benzotriazole, 2-(5'-tert-butyl-2'-hydroxyphenyl)benzotriazole, 2-(2'-hydroxy-5'-(1 ,1 ,3,3-tetramethylbutyl)phenyl) benzotriazole, 2-(3',5'-di-tert-butyl-2'-hydroxyphenyl)-5-chloro-benzotriazole, 2-(3'-tert-butyl- 2'-hydroxy-5'-methyl-phenyl)-5-chloro-benzotriazole, 2-(3'-sec-butyl-5'-tert-butyl-2'-hydroxyphenyl)benzotriazole, 2-(2'-hydroxy-4'-octyloxyphenyl)benzotriazole, 2-(3',5'-di-tert-amyl-2'-hydroxyphenyl)benzotriazole, 2-(3',5'-bis-(.alpha.,.alpha.-dimethylbenzyl)-2'-hydroxyphenyl)benzotriazole, mixture of 2-(3'-tert-butyl-2'-hydroxy-5'-(2-octyloxycarbonylethyl)phenyl)-5-chloro-benzotriazole, 2-(3'-tert-butyl-5'-�2-(2-ethylhexyloxy)-carbonylethyl!-2'-hydroxyphenyl)-5-chloro-benzotriazole, 2-(3'-tert-butyl-2'-hydroxy-5'-(2-methoxycarbonylethyl)phenyl)-5-chloro-benzotriazole, 2-(3'-tert-butyl-2'-hydroxy-5'-(2-methoxycarbonylethyl)phenyl)benzotriazole, 2-(3'-tert-butyl-2'-hydroxy-5'-(2-octyloxycarbonylethyl)phenyl)benzotriazole, 2-(3'-tert-butyl-5'-�2-(2-ethylhexyloxy)carbonylethyl!-2'-hydroxyphenyl)benzotriazole, 2-(3'-dodecyl-2'-hydroxy-5'-methylphenyl)benzotriazole, and 2-(3'-tert-butyl-2'-hydroxy-5'-(2-isooctyloxycarbonylethyl)phenylbenzotriazole, 2,2'-methylene-bis�4-(1,1,3,3-tetramethylbutyl)-6-benzotriazole-2-ylphenol!; the transesterification product of 2-�3'-tert-butyl-5'-(2-methoxycarbonylethyl)-2'-hydroxyphenyl!-2H-benzotriazole with polyethylene glycol300;, where R=3'-tert-butyl-4'-hydroxy-5'-2H-benzotriazol-2-ylphenyl. 2.2. 2-Hydroxybenzophenones, for example the 4-hydroxy, 4-methoxy, 4-octyloxy, 4-decyloxy, 4-dodecyloxy, 4-benzyloxy, 4,2',4'-trihydroxy and 2'-hydroxy-4,4'-dimethoxy derivatives. 2.3. Esters of substituted and unsubstituted benzoic acids, as for example 4-tertbutyl-phenyl salicylate, phenyl salicylate, octylphenyl salicylate, dibeanzoyl resorcinol, bis(4-tert-butylbenzoyl) resorcinol, benzoyl resorcinol, 2,4-di-tertbutylphenyl 3,5-di-tert-butyl-4-hydroxybenzoate, hexadecyl 3,5-di-tert-butyl-4-hydroxybenzoate, octadecyl 3,5-di-tert-butyl-4-hydroxybenzoate, 2-methyl-4,6-di-tert-butylphenyl 3,5-di-tert-butyl-4-hydroxybenzoate. 2.4. Acrylates, for example ethyl .alpha.-cyano-.beta.,.beta.-diphenylacrylate, isooctyl .alpha.-cyano-.beta.,.beta.-diphenylacrylate, methyl .alpha.-carbomethoxycinnamate, methyl .alpha.-cyano-.beta.-methyl-p-methoxy-cinnamate, butyl .alpha.-cyano-.beta.-methyl-p-methoxy-cinnamate, methyl .alpha.-carbomethoxy-p-methoxycinnamate and N-(.beta.-carbomethoxy-.beta.-cyanovinyl)-2-methylindoline. 2.5. Nickel compounds, for example nickel complexes of 2,2'-thio-bis-�4-(1 ,1,3,3-tetra-methylbutyl)phenol!, such as the 1:1 or 1:2 complex, with or without additional ligands such as n-butylamine, triethanolamine or N-cyclohexyldiethanolamine, nickel dibutyldithiocarbamate, nickel salts of the monoalkyl esters, e.g. the methyl or ethyl ester, of 4-hydroxy-3,5-di-tert-butylbenzylphosphonic acid, nickel complexes of ketoximes, e.g. of 2-hydroxy-4-methylphenyl undecylketoxime, nickel complexes of 1 -phenyl-4-lauroyl-5-hydroxypyrazole, with or without additional ligands. 2.6. Sterically hindered amines, for example bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate, bis(2,2,6,6-tetramethyl-4-piperidyl)succinate, bis(1,2,2,6,6-pentamethyl-4-piperidyl)sebacate, bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidyl)sebacate, bis(1,2,2,6,6-pentamethyl-4-piperidyl) n-butyl-3,5-di-tert-butyl-4-hydroxybenzylmalonate, the condensate of 1-(2-hydroxyethyl)-2,2,6,6-tetramethyl-4-hydroxypiperidine and succinic acid, the condensate of N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl)hexamethylenediamine and 4-tert-octylamino-2,6-dichloro-1,3,5-triazine, tris(2,2,6,6-tetramethyl-4-piperidyl)nitrilotriacetate, tetrakis(2,2,6,6-tetramethyl-4-piperidyl)-1,2,3,4-butane-tetracarboxylate, 1,1'-(1,2-ethanediyl)bis(3,3,5,5-tetramethylpiperazinone), 4-benzoyl-2,2,6,6-tetramethylpiperidine, 4-stearyloxy-2,2,6,6-tetramethylpiperidine, bis(1,2,2,6,6-pentamethylpiperidyl)-2-n-butyl-2-(2-hydroxy-3,5-di-tert-butylbenzyl)malonate, 3-n-octyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro�4.5!decan-2,4-dion, bis(1 -octyloxy-2,2,6,6-tetramethylpiperidyl)sebacate, bis(1 -octyloxy-2,2,6,6-tetramethyl-piperidyl)succinate, the condensate of N,N'-bis-(2,2,6,6-tetramethyl-4-piperidyl)hexamethylenediamine and 4-morpholino-2,6-dichloro-1,3,5-triazine, the condensate of 2-chloro-4,6-bis(4-n-butylamino-2,2,6,6-tetramethylpiperidyl )-1,3,5-triazine and 1,2-bis(3-aminopropylamino)ethane, the condensate of 2-chloro-4,6-di-(4-n-butylamino-1,2,2,6,6-pentamethyl-piperidyl)-1,3,5-triazine and 1,2-bis-(3-aminopropylamino)ethane, 8-acetyl-3-dodecyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro�4.5!decane-2,4-dione, 3-dodecyl-1-(2,2,6,6-tetramethyl-4-piperidyl)pyrrolidin-2,5-dione, 3-dodecyl- 1-(1, 2,2,6,6-pentamethyl-4-piperidyl)pyrrolidine-2,5-dione, a mixture of 4-hexadecyloxy- and 4-stearyloxy-2,2,6,6-tetramethylpiperidine, a condensation product of N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl)hexamethylenediamine and 4-cyclohexylamino-2,6-dichloro-1,3,5-triazine, a condensation product of 1,2-bis(3-amino-propylamino)ethane and 2,4,6-trichloro-1,3,5-triazine as well as 4-butylamino-2,2,6,6-tetramethylpiperidine (CAS Reg. No. �136504-96-6!); N-(2,2,6,6-tetramethyl-4-piperidyl)-n-dodecylsuccinimid, N-(1,2,2,6,6-pentamethyl-4-piperidyl)-n-dodecylsuccinimid, 2-undecyl-7,7,9,9-tetramethyl-1-oxa-3,8-diaza-4-oxo-spiro�4,5!decane, a reaction product of 7,7,9,9-tetramethyl-2-cycloundecyl-1 -oxa-3,8-diaza-4-oxospiro �4,5!decane und epichlorohydrin. 2.7. Oxamides, for example 4,4'-dioctyloxyoxanilide, 2,2'-diethoxyoxanilide, 2,2'-dioctyloxy-5,5'-di-tert-butoxanilide, 2,2'-didodecyloxy-5,5'-di-tert-butoxanilide, 2-ethoxy-2'-ethyloxanilide, N,N'-bis(3-dimethylaminopropyl)oxamide, 2-ethoxy-5-tert-butyl-2'-ethoxanilide and its mixture with 2-ethoxy-2'-ethyl-5,4'-di-tert-butoxanilide and mixtures of ortho- and para-methoxy-disubstituted oxanilides and mixtures of o- and p-ethoxy-disubstituted oxanilides. 2.8. 2-(2-Hydroxyphenyl)-1,3,5-triazines, for example 2,4,6-tris(2-hydroxy-4-octyloxyphenyl)-1,3,5-triazine, 2-(2-hydroxy-4-octyloxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, 2-(2,4-dihydroxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, 2,4-bis(2-hydroxy-4-propyloxyphenyl)-6-(2,4-dimethylphenyl)-1,3,5-triazine, 2-(2-hydroxy-4-octyloxyphenyl)-4,6-bis(4-methylphenyl)-1,3,5-triazine, 2-(2-hydroxy-4-dodecyloxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, 2-(2-hydroxy-4-tridecyloxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, 2-�2-hydroxy-4-(2-hydroxy-3-butyloxy-propoxy)phenyl!-4,6-bis(2,4-dimethyl)-1,3,5-triazine, 2-�2-hydroxy-4-(2-hydroxy-3-octyloxy-propyloxy)phenyl!-4,6-bis(2,4-dimethyl)-1,3,5-triazine, 2-�4-(dodecyloxy/tridecyloxy-2-hydroxypropoxy)-2-hydroxy-phenyl!-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, 2-�2-hydroxy-4-(2-hydroxy-3-dodecyloxy-propoxy)phenyl!-4,6-bis(2,4-di-methylphenyl)-1,3,5-triazine, 2-(2-hydroxy-4-hexyloxy)phenyl-4,6-diphenyl-1,3,5-triazine, 2-(2-hydroxy-4-methoxyphenyl)-4,6-diphenyl-1,3,5-triazine, 2,4,6-tris�2-hydroxy-4-(3-butoxy-2-hydroxy-propoxy)phenyl!-1,3,5-triazine, 2-(2-hydroxyphenyl)-4-(4-methoxyphenyl)-6-phenyl-1,3,5-triazine. 3. Metal deactivators, for example N,N'-diphenyloxamide, N-salicylal-N'-salicyloyl hydrazine, N, N'-bis(salicyloyl) hydrazine, N, N'-bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl) hydrazine, 3-salicyloylamino-1,2,4-triazole, bis(benzylidene)oxalyl dihydrazide, oxanilide, isophthaloyl dihydrazide, sebacoyl bisphenylhydrazide, N,N'-diacetyladipoyl dihydrazide, N,N'-bis(salicyloyl)oxalyl dihydrazide, N,N'-bis(salicyloyl)thiopropionyl dihydrazide. 4. Phosphites and phosphonites, for example triphenyl phosphite, diphenyl alkyl phosphites, phenyl dialkyl phosphites, tris(nonylphenyl) phosphite, trilauryl phosphite, trioctadecyl phosphite, distearyl pentaerythritol diphosphite, tris(2,4-di-tert-butylphenyl) phosphite, diisodecyl pentaerythritol diphosphite, bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite, bis(2,6-di-tert-butyl-4-methylphenyl)-pentaerythritol diphosphite, diisodecyloxypentaerythritol diphosphite, bis(2,4-di-tert-butyl-6-methylphenyl)pentaerythritol diphosphite, bis(2,4,6-tris(tert-butylphenyl)pentaerythritol diphosphite, tristearyl sorbitol triphosphite, tetrakis(2,4-di-tert-butylphenyl) 4,4'-biphenylene diphosphonite, 6-isooctyloxy-2,4,8,1 0-tetra-tert-butyl-1 2H-dibenz�d,g!- 1,3,2-dioxaphosphocin, 6-fluoro-2,4,8,10-tetra-tert-butyl-12-methyl-dibenz�d,g!-1,3,2-dioxaphosphocin, bis(2,4-di-tert-butyl-6-methylphenyl)methylphosphite, bis(2,4-di-tert-butyl-6-methylphenyl)ethylphosphite. 5. Hydroxylamines, for example, N,N-dibenzylhydroxylamine, N,N-diethylhydroxylamine, N,N-dioctylhydroxylamine, N,N-dilaurylhydroxylamine, N,N-ditetradecylhydroxylamine, N,N-dihexadecylhydroxylamine, N,N-dioctadecylhydroxylamine, N-hexadecyl-N-octadecyl-hydroxylamine, N-heptadecyl-N-octadecylhydroxylamine, N,N-dialkylhydroxylamine derived from hydrogenated tallow amine. 6. Nitrones, for example, N-benzyl-alpha-phenyl-nitrone, N-ethyl-alpha-methyl-nitrone, N-octyl-alpha-heptyl-nitrone, N-lauryl-alpha-undecyl-nitrone, N-tetradecyl-alpha-tridecyl-nitrone, N-hexadecyl-alpha-pentadecyl-nitrone, N-octadecyl-alpha-heptadecyl-nitrone, N-hexadecyl-alpha-heptadecyl-nitrone, N-ocatadecyl-alpha-pentadecyl-nitrone, N-heptadecyl-alpha-heptadecyl-nitrone, N-octadecyl-alpha-hexadecyl-nitrone, nitrone derived from N,N-dialkyl-hydroxylamine derived from hydrogenated tallow amine. 7. Thiosynergists, for example, dilauryl thiodipropionate or distearyl thiodipropionate. 8. Peroxide scavengers, for example esters of .beta.-thiodipropionic acid, for example the lauryl, stearyl, myristyl or tridecyl esters, mercaptobenzimidazole or the zinc salt of 2-mercaptobenzimidazole, zinc dibutyldithiocarbamate, dioctadecyl disulfide, pentaerythritol tetrakis(.beta.-dodecylmercapto)propionate. 9. Polyamide stabilisers, for example, copper salts in combination with iodides and/or phosphorus compounds and salts of divalent manganese. 10. Basic co-stabilisers, for example, melamine, polyvinylpyrrolidone, dicyandiamide, triallyl cyanurate, urea derivatives, hydrazine derivatives, amines, polyamides, polyurethanes, alkali metal salts and alkaline earth metal salts of higher fatty acids for example calcium stearate, zinc stearate, magnesium behenate, magnesium stearate, sodium ricinoleate and potassium palmitate, antimony pyrocatecholate or tin pyrocatecholate. 11. Nucleating agents, for example, inorganic substances such as talcum, metal oxides such as titanium dioxide or magnesium oxide, phosphates, carbonates or sulfates of, preferably, alkaline earth metals; organic compounds such as mono- or polycarboxylic acids and the salts thereof, e.g. 4-tert-butylbenzoic acid, adipic acid, diphenylacetic acid, sodium succinate or sodium benzoate; polymeric compounds such as ionic copolymers ("ionomers"). 12. Fillers and reinforcing agents, for example, calcium carbonate, silicates, glass fibres, glass bulbs, asbestos, talc, kaolin, mica, barium sulfate, metal oxides and hydroxides, carbon black, graphite, wood flour and flours or fibers of other natural products, synthetic fibers. 13. Other additives, for example, plasticisers, lubricants, emulsifiers, pigments, rheology additives, catalysts, flow-control agents, optical brighteners, flameproofing agents, antistatic agents and blowing agents. 14. Benzofuranones and indolinones, for example those disclosed in U.S. Pat. No. 4,325,863, U.S. Pat. No. 4,338,244, U.S. Pat. No. 5,175,312, U.S. Pat. No. 5,216,052, U.S. Pat. No. 5,252,643, DE-A-4316611, DE-A-4316622, DE-A-4316876, EP-A-0589839 or EP-A-0591102 or 3-�4-(2-acetoxyethoxy)phenyl!-5,7-di-tert-butyl-benzofuran-2-one, 5,7-di-tert-butyl-3-�4-(2-stearoyloxyethoxy)phenyl!benzofuran-2-one, 3,3'-bis�5,7-di-tert-butyl-3-(4-�2-hydroxyethoxy!phenyl)benzofuran-2-one!, 5,7-di-tert-butyl-3-(4-ethoxyphenyl)benzofuran-2-one, 3-(4-acetoxy-3,5-dimethylphenyl)-5,7-di-tert-butyl-benzofuran-2-one, 3-(3,5-dimethyl-4-pivaloyloxyphenyl)-5,7-di-tert-butyl-benzofuran-2-one.

The weight ratio of the compounds of the formula (I) to the conventional additives may be 1:0.5 to 1:5.

The compounds of the formula (I) can also be used as stabilizers, especially as light stabilizers, for almost all materials known in the art of photographic reproduction and other reproduction techniques as e.g. described in Research Disclosure 1990, 31429 (pages 474 to 480).

The compounds of the formula (I) are particularly useful for stabilizing polypropylene tapes and fibres. The invention is illustrated in more detail by the following Examples. All percentages are by weight, unless otherwise indicated.

Example 1 Preparation of the Compound of the Formula ##STR9##

A mixture of 35.8 g (0.2 mole) of the sodium salt of 2,2,6,6-tetramethyl-4-hydroxypiperidine in 200 ml of xylene is slowly added to a solution of 36.9 g (0.2 mole) of cyanuric chloride in 200 ml of xylene cooled to -10.degree. C. Subsequently, the reaction mixture is stirred for 1 hour at 0.degree. C., heated to 60.degree. C. and under vacuum, 250 ml of xylene are separated off.

The mixture is cooled to room temperature and 82.9 g (0.21 mole) of N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl)-1,6-hexanediamine in 100 ml of xylene are added. Then, the mixture is heated to 60.degree. C. for 2 hours and further 2 hours at reflux. After cooling, 20.0 g (0.5 mole) of NaOH are added in powder form and the reaction mixture is heated 10 hours at reflux, the reaction water being separated off azeotropically.

After cooling and filtration over earth, the solution is evaporated at 140.degree. C. and 1 mbar. After cooling again, the desired product is obtained as a white powder with a melting point of 173.degree.-183.degree. C. and Mn=5300 g/mole.

Example 2 Preparation of the Compound of the Formula ##STR10##

A) Preparation of (4,6-dichloro-�1,3,5!-triazin-2-yl)-(2,2,6,6-tetramethyl-4-piperidyl)-amine.

To a solution of 90 g (0.49 moles) of cyanuric chloride in 700 ml of 1,2-dichloroethane, cooled to -10.degree. C., a solution of 76.2 g (0.49 moles) of 2,2,6,6-tetramethyl-4-piperidylamine in 100 ml of 1,2-dichloroethane is slowly added, maintaining the temperature at -10C. during the addition. Then, the mixture is stirred for 1 hour at -10.degree. C. and a solution of 21.4 g (0.54 moles) of sodium hydroxide in 60 ml of water is added, maintaining the above mentioned temperature during the addition.

Subsequently, the mixture is stirred for 1 hour at room temperature and the organic phase is collected. Then, the organic phase is washed twice with 150 ml of water, dried over sodium sulfate and evaporated at 60.degree. C./1 mbar.

After drying in an oven, a solid is obtained with a melting point of 150.degree.-152.degree. C.

CI analysis:

Calculated: 23.31%

Found: 22.97%

B) A mixture of 60.8 g (0.2 moles) of (4,6-dichloro-�1,3,5!-triazin-2-yl)-(2,2,6,6-tetramethyl-4-piperidyl)-amine and 82.9 g (0.21 moles) of N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl)-1,6-hexanediamine in 200 ml of xylene is heated to reflux and stirred for 1 hour at this temperature. Then, the mixture is cooled to 60.degree. C. and 22 g (0.55 moles) of sodium hydroxide are added in powder form.

Subsequently, the reaction mixture is heated for 2 hours to reflux, cooled again to 60.degree. C. and 30 ml of water are added.

Then, the mixture is heated at reflux and under stirring for 12 hours, the reaction water and the added water being separated off azeotropically.

After cooling and filtration over earth, the solution is evaporated at 140.degree. C./1 mbar.

After cooling, a white solid product with a melting point of 163.degree.-170.degree. C. and Mn=2190 g/mole is obtained.

Example 3

By using the same reactants and the same synthesis conditions as in Example 2, but with an excess of N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl)-1,6-hexanediamine (20% molar excess), a compound of the same formula as in Example 2, with a melting point of 132.degree.-135.degree. C. and Mn=1485 g/mole is obtained.

In the above Examples 1 to 3, the number average molecular weight is determined according to the following procedure:

The determination is carried out in a vapor pressure osmometer .RTM.OSMOMAT 070 (.RTM.GONOTEC-Germany). The osmometer consists of a thermostatic chamber saturated with the analytical solvent in which two thermistors are situated; one for reference and one for measurement.

Before the beginning of the measurement a drop of pure solvent is put on each thermistor and the bridge is adjusted to zero after 5 minutes.

Then, a solution containing a substance of known molecular weight (M.sub.Ref) is measured. For this purpose the solvent on the measurement thermistor is replaced by a drop of a known concentration solution and the change of resistance to rebalance the bridge after 5 minutes is determined. This procedure is carried out for four solutions of different concentrations (0.01 molal, 0.02 molal, 0.03 molal and 0.04 molal*). Extrapolation to infinite dilution gives K.sub.Ref =const/M.sub.Ref.

The measurement are repeated with the solutions containing a substance of unknown molecular weight (Mn). Extrapolation to infinite dilution gives K.sub.meas =const/Mn.

Then, the number average molecular weight is calculated according to the following equation: ##EQU1## Example 4 Light-Stabilizing Action in Polypropylene Fibres.

2.5 g of the stabilizer indicated in Table 1, 1 g of tris(2,4-di-t-butylphenyl) phosphite, 1 g of calcium monoethyl 3,5-di-t-butyl-4-hydroxybenzyl-phosphonate, 1 g of calcium stearate and 2.5 g of titanium dioxide are mixed in a slow mixer with 1000 g of polypropylene powder having a melt index=12 g/10 min (measured at 230.degree. C. and 2.16 kg).

The mixtures are extruded at 200.degree.-230.degree. C. to obtain polymer granules which are then converted into fibres using a pilot-type apparatus (.RTM.Leonard-Sumirago(VA), Italy) and operating under the following conditions:

extruder temperature: 200.degree..varies.230.degree. C. head temperature: 255.degree.-260.degree. C. stretch ratio: 1:3.5 linear density: 11 dtex per filament

The fibres prepared in this way are exposed, after mounting on white cardboard, in a 65WR Weather-O-Meter (ASTM D2565-85) with a black panel temperature of 63.degree. C.

For samples taken after various times of exposure to the light, the residual tenacity is measured using a constant-speed tensometer, and the exposure time in hours needed to halve the initial tenacity (T.sub.50) is then calculated.

For purposes of comparison, fibres prepared under the same conditions as stated above, but without adding the stabilizers of the present invention, are also exposed.

The results are shown in Table 1.

TABLE 1______________________________________Stabilizer T.sub.50 (hours)______________________________________Without stabilizer 370Compound of Example 1 3440Compound of Example 2 3440Compound of Example 3 3500______________________________________ Example 5 Light-Stabilizing Action in Polypropylene Tapes

1 g of the compound referred to in Table 2, 1.0 g of tris(2,4-di-t-butylphenyl) phosphite, 0.5 g of pentaerythritol tetrakis�3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate! and 1 g of calcium stearate are mixed in a low-speed mixer with 1000 g of polypropylene in powder form, having a melt index=12 g/10 min (measured at 230.degree. C. and 2.16 kg).

The mixtures are extruded at 200.degree.-230.degree. C. in order to obtain polymer granules which are then converted into stretched tapes having a thickness of 50 .mu.m and a width of 2.5 mm, using a semi-industrial apparatus (.RTM.Leonard-Sumirago (VA) Italia), operating under the following conditions:

extruder temperature: 210.degree. 230.degree. C. temperature of the head: 240.degree. 260.degree. C. stretch ratio: 1:6

The tapes material thus prepared is exposed, after mounting on white cardboard, in a Weather-O-Meter, Model 65WR (ASTM D2565-85) with a black panel temperature of 63.degree. C. The residual tenacity is measured on samples taken after exposure to light for different periods of time, using a constant-velocity dynamometer, and the time (in hours) required to reduce the initial tenacity by 50% (T.sup.50) calculated from these values.

For comparison purposes, tapes which have been prepared under the conditions described above but without the addition of the stabilizing agents are also exposed. The results are shown in Table 2.

TABLE 2______________________________________Stabilizer T.sub.50 (hours)______________________________________Without stabilizer 560Compound of Example 1 3320Compound of Example 2 3495Compound of Example 3 3300______________________________________

Claims

1. A compound of the formula (I) ##STR11## wherein n is a number from 1 to 20;

the radicals R.sub.1 are independently of one another hydrogen, C.sub.1 -C.sub.8 alkyl, --O, --OH, --CH.sub.2 CN, C.sub.1 -C.sub.18 alkoxy, C.sub.5 -C.sub.12 cycloalkoxy, C.sub.3 -C.sub.6 alkenyl, C.sub.7 -C.sub.9 phenylalkyl which is unsubstituted or substituted on the phenyl by 1, 2 or 3 C.sub.1 -C.sub.4 alkyl; or C.sub.1 -C.sub.8 acyl;

R.sub.2 has one of the meanings given for R.sub.1 ;

X is C.sub.2 -C.sub.4 alkylene; and

Y is --O-- or >NH;

with the proviso that in the individual recurrent units of the formula (I), each of the radicals R.sub.1, R.sub.2, X and Y has the same or different definitions.

2. A compound according to claim 1 wherein the radicals R.sub.1 are independently of one another hydrogen, C.sub.1 -C.sub.4 alkyl, --OH, C.sub.6 -C.sub.12 alkoxy, C.sub.5 -C.sub.8 cycloalkoxy, allyl, benzyl or acetyl; and R.sub.2 has one of the meanings given for R.sub.1.

3. A compound according to claim 1 wherein the radicals R.sub.1 are identical and are hydrogen, methyl or cyclohexyloxy; R.sub.2 has one of the meanings given for R.sub.1 ; and X is C.sub.2 -C.sub.6 alkylene; with the proviso that in the individual recurrent units of the formula (I), each of the radicals R.sub.1, R.sub.2, X and Y has the same definitions.

4. A compound according to claim 3 wherein the radicals R.sub.1 are identical and are hydrogen or methyl; and R.sub.2 has one of the meanings given for R.sub.1.

5. A compound according to claim 1 wherein X is hexylene.

6. A compound according to claim 1 wherein n is a number from 3 to 20.

7. A compound according to claim 1 wherein Y is --O--.

8. A composition containing an organic material susceptible to degradation induced by light, heat or oxidation and at least one compound of the formula (I) according to claim 1.

9. A composition according to claim 8 wherein the organic material is a synthetic polymer.

10. A composition according to claim 8 wherein the organic material is polyethylene or polypropylene.

11. A method for stabilizing an organic material against degradation induced by light, heat or oxidation which comprises incorporating into said organic material at least one compound of the formula (I) according to claim 1.