MXPA98010233A - Stabilization of polyamide, polyester and polyace - Google Patents

Abstract

This invention relates to compositions comprising a) a polyamide, a polyester or polyacetal, and b) as a stabilizer the compound of formula I, with the proviso that, if the component (a) is a polyamide, then the composition does not contain hypophosphite metallic or copper salt of an organic acid, with the use of the compounds of formula I to stabilize polyamide, polyester or polyacetal against oxidative, thermal and / or light-induced degradation, as well as with a process to stabilize these plastic materials

Description

STABILIZATION OF POLYAMIDE, POLYESTER AND POLYACETAL BACKGROUND AND COMPENDIUM OF THE INVENTION The present invention relates to compositions comprising a polyamide, polyester or polyketone, with a specific phenolic antioxidant, with the use thereof for the stabilization of polyamides, polyesters or polyacetals against oxidative, thermal and / or light-induced degradation, as well as with a process for the stabilization of these plastic materials. It is known from the descriptions of the Patents North American 3,691,131 and 3,860,558 that polyamides can be stabilized with phenolic antioxidants in the presence of metal hypophosphites, such as potassium hypophosphite or sodium hypophosphite, and copper salts of organic acids. In polyamides, polyesters or polyacetals, these known stabilizing mixtures can not satisfy all the demands that are demanded of them. It is known that said stabilizing mixtures reduce the initial color, as well as the development of the color of the polyamide during the maturation of the furnace, and that they also reduce the deterioration of the mechanical properties of the polyamide during the maturation of the furnace and the exposure to the furnace. light. It has now been discovered that a specific phenolic antioxidant, which is selected from the specification of US Patents 3,691,131 and 3,860,558, is particularly suitable as a stabilizer for polyamides, polyesters or polyacetals in the absence of metal hypophosphites and copper salts of organic acids. The psiamides, polyesters or polyacetals established in this way possess improved properties with respect to oxidative, thermal and / or light-induced degradation. Therefore, this invention relates to compositions comprising a) a polyamide, polyester or polyacetal which is subject to oxidative, thermal or light-induced degradation, and b) the compound of formula I with the proviso that, if component (a) is a polyamide, then the composition does not contain metallic hypophosphite or copper salt of an organic acid. Component (b) of the new composition, or the compound of formula I, is known and possesses the registration number of Chemical Substrates [37042-77-6]. The preparation of the compound of formula I is described in GB-A-1 251 840, Example 1, page 5. It will be understood that polyamides will mean aromatic and aliphatic polyamides and copolyamides which are derived from diamines and dicarboxylic acids and / or aminocarboxylic acids or its corresponding lactams. Suitable polyamides are for example: PA 6, PA 11, PA 12, PA 46, PA 6,6, PA 4,6, PA 6,9, PA 6,10, or PA 6,12, PA 10,12, PA 12, 12 and also amorphous polyamides of the type Trogamid PA 6-3-T and Grilamid TR 55. Polyamides of the type mentioned are commonly known and can be obtained commercially.

The interesting compositions are those in which the component (a) is polyamide 6, polyamide 6,6, polyamide 4,6, polyamide 11 or polyamide 12, or copolymers thereof, in particular polyamide 6 or polyamide 6,6, or polyamide 6 modified elastomerically, or polyamide 6,6 combined with polypropylene. The polyesters used may be homo- or copolyesters which are composed of diols or hydroxycarboxylic acids, and aliphatic, cycloaliphatic or aromatic dicarboxylic acids. The aliphatic dicarboxylic acids can contain 2 to 40 carbon atoms, the cycloaliphatic dicarboxylic acids 6 to 10 carbon atoms, the aromatic dicarboxylic acids 8 to 14 carbon atoms, the aliphatic hydroxycarboxylic acids 2 to 12 carbon atoms and the aromatic hydroxycarboxylic acids , for example cycloaliphatics, 7 to 14 carbon atoms. The aliphatic diols may contain 2 to 12 carbon atoms, the cycloaliphatic diols 5 to 8 carbon atoms, and the aromatic diols 6 to 16 carbon atoms. Aromatic diols are those in which two hydroxyl groups are linked to one or different aromatic hydrocarbon radicals. The polyesters can also be branched with small amounts, for example 0.1 to 3% by mole, based on the dicarboxylic acids present, of more than difunctional monomers (for example pentaerythritol, trimellitic acid, 1, 3,5-tri (hydroxyphenyl) benzene, 2,4-dihydroxybenzoic acid, or 2- (4-hydroxyphenyl) -2- (2,4-dihydroxyphenyl) propane). Polyesters consisting of at least 2 monomers can be randomly distributed, or they can be block copolymers.

Suitable dicarboxylic acids are aliphatic dicarboxylic acids? branched and linear saturated, aromatic dicarboxylic acids and cycloaliphatic dicarboxylic acids. Suitable aliphatic dicarboxylic acids are those containing 2 to 40 carbon atoms, for example oxalic acid, malonic acid, dimethylmalonic acid, succinic acid, pimelic acid, adipic acid, trimethyladipic acid, sebacic acid, azelaic acid and dimeric acids (products dimerization of unsaturated aliphatic carboxylic acids such as oleic acid), alkylated succinic and malonic acids such as octadecyl succinic acid. Suitable cycloaliphatic dicarboxylic acids are: 1,3-cyclobutanedicarboxylic acid, 1,3-cyclopentanedicarboxylic acid, 1,3- and 1,4-cyclohexanedicarboxylic acid, 1,3- and 1,4- (dicarboxylmethyl) cyclohexane, 4-cyclohexanedicarboxylic acid. , 4'- dicyclohexyldicarboxylic acid. Suitable aromatic dicarboxylic acids are: in particular terephthalic acid, isophthalic acid, o-phthalic acid, and also 1,3-, 1,4-, 2,6-, or 2,7-! 5-naphthalene dicarboxylic acid, 4-acid, 4'-diphenyl-di-carboxylic acid, 4,4'-diphenylsulfonadicarboxylic acid, 4,4'-benzophenonadicarboxylic acid, 1, 1,3-tri-methyl-5-carboxyl-3- (p-carboxylphenyl) indan, 4,4'-acid diphenyl ether dicarboxylic, bis-p- (carboxylphenyl) methane or bis-p- (carboxylphenyl) ethane. The aromatic dicarboxylic acids are preferred, and among these in particular, terephthalic acid, isophthalic acid and 2,6-naphthalenedicarboxylic acid. Other suitable dicarboxylic acids are those containing -CO-NH groups; are described in DE-A-2 414 349. Dicarboxylic acids containing N-heterocyclic rings are also suitable, for example those derived from carboxyalkylated, carboxyphenylated or carboxybenzylated mannamine-s-triazindicarboxylic acids (cf. DE-A-2). 121 184 and 2 533 675), mono or bishidantoins, parabanic acid or optionally halogenated benzimidazoles.

In this context, the carboxyalkyl groups may contain 3 to 20 carbon atoms. Suitable aliphatic diols are linear and branched aliphatic glycols, in particular those containing 2 to 12, preferably 2 to 6, carbon atoms in the molecule, for example: ethylene glycol, 1, 2- and 1,3-propylene glycol, 1 , 2-, 1, 3-, 2,3- or 1,4-butanediol, pentylglycol, neopentyl glycol, 1,6-hexanediol, 1,12-dodecanediol. A suitable cycloaliphatic diol is, for example, 1,4-dihydroxycyclohexane. Other suitable aliphatic diols are, for example, 1,4-bis (hydroxymethyl) cyclohexane, aromatic-aliphatic diols, such as p-xylene glycol or 2,5-dichloro-p-xylene glycol, 2,2- (β-hydroxyethoxyphenyl) ) propane and polyoxyalkylene glycols, such as ethylene glycol, triethylene glycol, polyethylene glycol, or polypropylene glycol.

The alkylenediols are preferably linear, and preferably contain 2 to 4 carbon atoms. Preferred diols are the alkylene diols, 1,4-dihydroxycyclohexane and 1,4-bis (hydroxymethyl) cyclohexane. Ethylene glycol, 1,4-butanediol and 1,2- and 1,3-propylene glycol are particularly preferred. Other suitable aliphatic diols are the β-hydroxyalkylated bis-phenols, in particular β-hydroxyethyls, such as 2,2-bis [4 '- (β-hydroxyethoxy) phenyl] propane. Other bisphenols are mentioned below. Another group of suitable aliphatic diols is that of the heterocyclic diols described in DE-A-1 812 003, DE-A-2 342432, DE-A-2 342 372 and DE-A-2 453 326. Examples are: N, N'-bis (β-hydroxyethyl) -5,5-dimethylhydantoin, N, N'-bis (β-hydroxypropyl) -5,5-dimethylhydantoin, methylene -bis- [N- (ß-hydroxyethyl) -5-methyl-5-ethylhydantoin], methylene-bis- [N- (ß-hydroxyethyl) -5,5-dimethylhydantoin], N, N'-bis (ß- hydroxyethyl) benzimidazolone, N, N'-bis (β-hydroxyethyl) - (tetrachloro) benzimidazolone, or N, N'-bis (β-hydroxyethyl) - (tetrabromo) benzimidazolone.

Suitable aromatic diols are mononuclear diphenols, and in particular, dinuclear diphenols having a hydroxyl group in each aromatic nucleus. It is understood that the aromatic term preferably refers to hydrocarbon-aromatic radicals, for example phenylene or naphthylene. In addition to, for example, hydroquinone, resorcinol or 1,5-, 2,6- and 2,7-dihydroxynaphthalene, particular mention should be made of bisphenols which can be represented by the following formulas: The hydroxyl groups can be in the m position, and in particular, in the p position. R 'and R "in these formulas can mean alkyl containing 1 to 6 carbon atoms, halogen, such as chlorine or bromine, and preferably hydrogen atoms, A can be a direct bond, or oxygen, sulfur, -SO- , -S02-, c = o, -P (O) (C 1 -C 20 alkyl), substituted or unsubstituted alkylidene, cycloalkylidene or alkylene. Examples of unsubstituted alkylidene or substituted are: ethylidene, 1-, 1- or 2,2-propylidene, 2,2-butylidene, 1,1-isobutylidene, pentylidene, hexylidene, heptylidene, octylidene, dichloroethylidene, trichloroethylidene. Examples of substituted or unsubstituted alkylene are methylene, ethylene, phenylmethylene, diphenylmethylene, methylphenylmethylene. Examples of cycloalkylidene are cyclopentylidene, cyclohexylidene, cycloheptylidene and cyclooctylidene. Examples of bisphenols are: bis (p-hydroxyphenyl) ether or bis (p-hydroxyphenyl) thioether, bis (p-hydroxyphenyl) sulfone, bis (p-hydroxyphenyl) methane, bis (4-hydroxyphenyl) -2,2'-biphenyl , phenylhydroquinone, 1,2-bis (p-hydroxyphenyl) ethane, 1-phenyl-bis (p-hydroxyphenyl) methane, diphenyl-bis (p-hydroxyphenyl) methane, diphenyl-bis (p-hydroxyphenyl) ethane, bis (3) , 5-D-methyl-4-hydroxyphenyl) sulfone, bis (3,5-dimethyl-4-hydroxyphenyl) -p-dpropylbenzene, bis (3,5-dimethyl-4-hydroxyphenyl) -m-dpropylbenzene, , 2-bis (3 ', 5'-d, methyl-4'-hydroxyphenyl) propane, 1,1- or 2,2-bis (p-hydroxyphenyl) butane, 2,2-bis (p-hydroxyphenyl) ) -hexaf luoropropane, 1,1-dichloro or 1,1,1-trichloro-2,2-bis (p-hydroxyphenyl) ethane, 1,1-bis- (p-hydroxyphenyl) cyclopentane, and in particular, 2, 2-bis (p-hydroxyphenyl) propane (bisphenol A) and 1,1-bis (p-hydroxyphenyl) cyclohexane (bisphenol C). Suitable polyesters of hydroxycarboxylic acids are, for example, polycaprolactone, polypivalolactone, or polyesters of 4-hydroxycyclohexanecarboxylic acid or 4-hydroxybenzoic acid. Further suitable are polymers which may contain predominantly ester bonds, but also other bonds, for example polyester amides or polyester midas. Polyesters containing aromatic dicarboxylic acids have become the most important, in particular the polyalkylene terephthalates. Therefore, those molding compositions of the invention in which the polyester is composed of at least 30% by mole, preferably at least 40% by mole, of aromatic dicarboxylic acids, and of at least 30% by weight are preferred. % by mole, preferably at least 40% by mole, of alkylene diols preferably containing 2 to 12 carbon atoms, based on the polyester. In this case the alkylene diol is preferably linear, and contains 2 to 6 carbon atoms, such as ethylene, tri-, tetra-, or hexamethylene glycol, and aromatic dicarboxylic acid denotes terephthalic and / or isophthalic acid. Particularly preferred polyesters are PET, PETG (glycol-modified polyethylene terephthalate) or PBT (polybutylene terephthalate) and corresponding copolymers, with PET and its copolymers being especially preferred. Polyacetals are, for example, homopolymers or copolymers of paraformaldehyde, such as in particular polyoxymethylene (POM), and those polyoxymethylenes containing comonomers, such as ethylene oxide, and polyacetals which are modified by thermoplastic polyurethanes, acrylates or MBS. Useful compositions are those, as described above, wherein the component (b) is present in an amount of 0.01 to 1%, preferably 0.02 to 0.8%, for example 0.03 to 0. , 6%, based on the weight of component (a). In addition to components (a) and (b), the new compositions may contain additional or co-stabilizing additives, such as the following: 1. Antioxidants 1.1. Alkylated monophenols, for example, 2,6-di-tert-butyl-4-methylphenol, 2-tert-butyl-4,6-di-methylphenol, 2-di-tert-butyl-4-eti If enol, , 6-di-tert-butyl-4-n-butylphenol, 2,6-di-tert-butyl-4-isobutylphenol, 2,6-dicyclopentyl-4-methylphenol, 2- (a-methylcyclohexyl) -4,6 -dimethylphenol, 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, , 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. Alkyltiomethylphenols. for example 2,4-dioctyl-methyl-6-tert-butylphenol, 2,4-dioctylthiomethyl-6-methylphenol, 2,4-dioctylthiomethyl-6-ethylphenol, 2,6-di-dodecylthiomethyl-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 -octadecyclohexylphenol, 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 α-tocopherol, β-tocopherol, β-tocopherol, d-tocopherol and mixtures thereof (Vitamin E). 1. 5. Hydroxylated thiodiphenyl ethers, for example 2,2'-thiobis (6-tert-butyl-4-meitylphenol), 2,2'-biobis (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- (α-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-ethylidebis (6-tert-butyl-4-isobutylphenol), 2, 2'-methylenebis [6- (a-methylbenzyl) -4-nonylphenol], 2,2'-methylenebis [6- (a, a-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, , 6-bis (3-tert-butyl-5-methyl-2-hydroxybenzyl) -4-methylphenol, 1, 1,3-tris (5-tert-butyl-4-hydroxy-2-methylphenyl) butane, , 1-bis (5-tert-butyl-4-hydroxy-2-methyl-phenyl) -3-n-dodecyl mercaptobutane, ethylene glycol bis [3,3-bis (3'-tert-butyl-4'-hydroxyphen l) butyrate], bis (3-tert-butyl-4-hydroxy-5-methyl-phenyl) dicyclopentadiene, bis [2- (3'-tert-butyl-2'-hydroxy-5'-methylbenzyl) -6- tert-butyl-4-methylphenylterephthalate , 1, 1-bis (3,5-dimethyl-2-hydroxyphenyl) butane, 2,2-bis (3,5-di-tert-butyl-4-hydroxyphenyl) propane, 2,2-bis (5-ter) -butyl-4-hydroxy-2-methylphenyl) -4-n-dodecyl mercaptobutane, 1, 1, 5,5-tetra- (5-tert-butyl-4-hydroxy-2-methylphenyl) pentane. 1. 7. Compounds of Q-. N- v S-benzyl. for example 3,5,3 ', 5'-tetra-tert-butyl-4,4'-dihydroxydibenzyl ether, octadecyl-4-hydroxy-3,5-dimethylbenzylmercaptoacetate, tridecyl-4-hydroxy-3,5-dihydroxy-3,5-dihydroxydibenzyl ether. 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-3,5-di-tert-butyl-4-hydroxybenzylmercaptoacetate. 1. 8. Hydroxybenzylated malonates. for example dioctadecyl-2,2-bis (3,5-di-tert-butyl) -hydroxybenzyl malonate, di-octadecyl-2- (3-tert-butyl-4-hydroxy-5-methylbenzyl) malonate, di-dodecyl mercaptoethyl -2,2-bis (3,5-di-tert-butyl-4-hydroxybenzyl) malonate, bis [4- (1,1,1,3-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-hydroxybenzyl) -2,4,6-trimethylbenzene, 1,4-bis (3,5 -di-tert-butyl-4-hydroxybenzyl) -2,3,5,6-tetramethylbenzene, 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-butyM-hydroxyanilinoJ-I .S.d-triazine, 2-octylmercapto-4,6-bis (3,5-di-tert-butyl-4-hydroxyanilino) -1, 3,5-triazine, 2-octymercapto-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-hydroxyphenylpro-ionyl) -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, dioctadecyl-3,5-di-tert-butyl-4- hydroxybenzylphosphonate, dioctadecyl-5-tert-butyl-4-hydroxy-3-methylbenzylphosphonate, the calcium salt of the 3,5-di-tert-butyl-4-hydroxybenzylphosphonic acid monoethyl ester. 1. 12. Acylaminophenols, for example 4-hydroxylauranylide, 4-hydroxysteatenylidene, octyl N- (3,5-di-tert-butyl-4-hydroxyphenyl) carbamate. 1. 13. Esters of ß- (3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid with mono- or polyhydric alcohols, for example with methanol, ethanol, n-octanol, i-octanol, octadecanol, , 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-tiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo [2.2.2] octane. 1. 14. Esters of β- (5-tert-butyl-4-hydroxy-3-methylphenylpropionic acid with mono- or polyhydric alcohols, for example with methanol, ethanol, n-octanol, i-octanol, octadecanol, 1,6 -hexanodiol, 1, 9-nonanediol, ethylene glycol, 1,2-propanediol, neopentyl glycol, tiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris (hydroxyethyl) isocyanurate, N, N'-bis (hydroxyethyl) oxamide, 3- tiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo [2.2.2] octane. 1. 15. Esters of β- (3,5-dirCyclohexyl-4-hydroxyphenyl) propionic acid with mono- or polyhydric alcohols, for example with methanol, ethanol, octanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol, , 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, for example with methanol, ethanol, octanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol, , 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 ß- (3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid, for example N.N'-bisiS.d-di-tert-butyl ^ -hydroxyphenylpropioni hexamethylenediamide, N, N'-bis (3,5-di-tert-butyl-4-hydroxyphenylpropionyl) trimethylenediamide, N, N'-bis (3,5-di-tert-butyl-4-hydroxyphenylpropionyl) hydrazide, N, N'-bis [2- (3- [3,5-di-tert-butyl-4-hydroxyphenyl] propionyloxy) ethyl] oxamide (Naugard® XL-1, supplied by Uniroyal). 1. 18. Ascorbic acid (Vitamin C) 1. 19. Amino 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-methyheptyl) -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 Na, N- (1-methylhexyl) -N'-phenyl-β-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-iopropoxydiphenylamine, N-phenyl-1-naphthylamine, N- (4-tert-octylphenyl) -1-naphthylamine, N-phenyl-2-naphthylamine, octylated diphenylamine, for example p, p'-di-tert-octyldiphenylamine, 4-n-butylaminophenol, 4-butyrylaminophenol, 4-nonanoylaminophenol, 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, N-phenyl-1-naphthylamine ter-octylated, a mixture of tert-butyl / tert-octyldiphenylamines mono- and dialkylated, a mixture of mono- and dialkylated nonildiphenylamines, a mixture of mono- and dialkylated dodecyldiphenylamines, a mixture of mono- and dialkylated isopropyl / isohexyldiphenylamines, a mixture of mono- and dialkylated ter-butyldiphenylamines, 2,3-dihydro -3,3-dimethyl-4H-1,4-benzothiazine, phenothiazine, a mixture of mono- and dialkylated ter-butyl / tert-octylphenothiazines, a mixture of mono- and dialkylated tert-octyl-phenothiazines, N-allylphenothiazine, 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 stabilizers 2.1. 2- (2'-Hydroxyphenyl) benzotriazoles, for example 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, 2- (3 ', 5'-di-tert-butyl-2'-hydroxyphenyl) benzotriazole, - (5'-tert-butyl-2'-hydroxyphenyl) benzotriazole, 2- (2'-hydroxy-5 '- (1,1-, 3,3-tetramethylbutyl) phenii) benzotriazole, 2- (3', 5 ' -di-tert-butyl-2'-hydroxyphenyl) -5-chloro-benzotriazole, 2- (3'-tert-butyl-2'-hydroxy-5'-methylphenyl) -5-chloro-benzotriazole, 2- (3 '-sec-butyl-d-tert-butyl ^' -hydroxypheni benzotriazole, 2- (2'-hydroxy-4'-octyloxyphenyl) benzotriazoi, 2- (3 ', 5'-di-ter-amyl-2' -hydroxyphenyl) benzotriazole, 2- (3 ', 5'-bis (a, a-dimethylbenzyl) -2'-hydroxyphenyl) benzotriazole, 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'-hydroxyl-5 '- (2-methoxycarbonyl-ethyl) phenyl) -5-chloro-benzotriazole, 2- (3'-tert-butyl-2'- hydroxy-5 '- (2-methoxycarbonylethyl) phenyl) benzotriazole, 2- (3'-tert-butyI-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, 2- (3'-tert-butyl-2'-hydroxy-5 '- (2-isooctyloxycarbonylethyl) phenolbenzotriazole, 2,2'-methylene-bis [4- (1, 1, 3,3-tetramethylbutyl) -6-benzotriazole-2-ylphene]; the transesterification product of 2- [3'-tert-butyl-5 '- (2-methoxycarbonylethyl) -2'-hydroxyphenyl] -2H-benzotriazole with polyethylene glycol 300; [R-CH2CH-COO-CH2CH2-9- where R = 3'-tert-butyl-4'-hydroxy-5'-2H-benzotriazol-2-ylphenyl, 2- [2'-hydroxy-3 '- (a , α-dimethylbenzyl) -5 '- (1,1-, 3,3-tetramethylbutyl) phenyl] benzotriazole; 2- [2'-hydroxy-3 '- (1,1-, 3,3-tetramethylbutyl) -5' - (a, a-dimethylbenzyl) phenyl] benzotriazole. 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 derivatives. 4,4'-dimethoxy. 2. 3. Esters of substituted and unsubstituted benzoic acids, such as for example 4-tert-butyl phenyl salicylate, phenyl salicylate, octylphenyl salicylate, dibenzoyl resorcinol, bis (4-tert-butylbenzoyl) resorcinol, benzoyl resorcinol, 2,4-di-ter- butylphenyl 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 achano-β, β-d-phenylacrylate, isooctyl a-cyano-β, β-diphenylacrylate, methyl a-carbomethoxycinnamate, methyl a-cyano-β-methyl-p-methoxy cinnamate, butyl a-cyano-β-methyl-p-methoxy-cinnamate, methyl a-carbomethoxy-p-methoxycinnamate and N- (β-carbomethoxy-β-cyanovinyl) -2-methyl-indoline. 2. 5. Nickel compounds, for example nickel complexes of 2,2'-thio-bis [4- (1,1,1,3-tetramethylbutyl) phenol], such as the complex 1: 1 or 1: 2, with or without additional ligands such as n-butylamine, triethanolamine or N-cyclohexyldiethanolamine, nickel dibutyldithiocarbamate, nickel salts of the monoalkyl esters, for example the methyl or ethyl ester of 4-hydroxy-3,5-di-ter- butylbenzylphosphonic, ketoximes nickel complexes, for example, 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, bs (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, linear or cyclic condensates of N, N'-bis (2,2,6,6-tetramethyl-4-pperidyl) hexamethylenediamine and 4-tert-octylamino-2,6-di- chloro-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-tetracarboxyiate, 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-pentamethylpperidyl) -2- n-butyl-2- (2-hydroxy-3,5-di-tert-butylbenzyl) maleate, 3-n-octyl-7,7,9,9-tetramethyl-1,3,8-triazaspyr [4,5] decan-2,4-dione, bis (1-octyloxy-2,2,6,6-tetramethylpiperidyl) sebacate, bis (1-octyloxy-2,2,6,6-tetramethylpiperidyl) succinate , linear or cyclic condensates of N, N'-bis (2,2,6,6-tetramethyl-4-piperidyl) hexamethylenediamine and 4-morfoyl-2,6-dicyoro-1, 3,5-triazine, Condensate of 2-chloro-4,6-bis (4-n-butylamino-2,2,6,6-tetramethylpiperidyl) -1,5,5-triazine and 1,2-bis (3-aminopropylamino) ethane, Condensate of 2-chloro-4,6-di- (4-n-butylamino-1, 2,2,6,6-pentamethylpiperidyl) -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-pyrididyl) pyrrolidin-2,5-dione, 3-dodecyl-1- (1, 2,2,6,6-pentamethyl-4-piperidyl) pyrrolidin-2, 5-dione, a mixture of 4-hexad eciloxy- and 4-stearyloxy-2,2,6,6-tetramethylpiperidine, a condensation product of N, N'-bis (2, 2,6,6-tetramethyl-4-piperidyl) hexamethylenediam; Na and 4-cyclohexylamino-2,6-dichloro-1, 3,5-triazine, a condensation product of 1,2-bis (3-aminopropylamino) 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-dodecyl succinimide, N- (1, 2,2,6,6-pentamethyl-4-piperidyl) -n-dodecyl succinimide, 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 and epichlorohydrin, 1, 1-bis (1, 2,2,6,6-pentamethyl-4-piperidyloxycarbonyl) -2- (4 -methoxyphenyl) ethene, N, N'-bis-formyl-N, N'-bis- (2,2,6,6-tetramethyl-4-piperidyl) hexamethylenediamine, 4-methoxy-methylene-malonic acid diester with 1, 2,2,6,6-pentamethyl-4-hydroxypiperidine, poly [methylpropyl-3-oxy-4- (2,2,6,6-tetramethyl-4-pi? eridyl)] siloxane, reaction product of maleic anhydride-to-olefin copolymer with 2,2,6,6-tetramethyl-4-aminopiperidine, or 1,2,3,6,6-pentamethyl-4-aminopiperidine. 2. 7. Oxamides. for example 4,4'-dioctyloxyoxanilide, 2,2'-diethoxyoxanilide, 2,2'-dioctyloxy-5,5'-di-tert-butoxyanilide, 2,2'-didodecyloxy-5,5'-di-ter- 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'-et L-5,4'-di-tert-butoxanilide, mixtures of o- and p-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-bs (2, 4-dimethyphenl) -1, 3,5-triazine, 2,4-bis (2-hydroxy-4-propyloxyphenyl) -6- (2,4-dimethylphenyl) -1, 3,5-triazine, 2- (2-hydroxy-4-octyloxy-phenyl) -4,6-bis- (4-methylphenyl) -1, 3,5-triazine, 2- (2-hydroxy-4-dodecyloxyphenyl) -4 , 6-bis (2,4-dimethyl-phenyl) -1, 3,5-triazine, 2- (2-hydroxy-4-trityl oxyphenyl) -4,6-bis (2,4-dimethylphenyl) -1 , 3,5-triazine, 2- [2-hydroxy-4- (2-hydroxy-3-butyloxy-propoxy) pheny] -4,6-bis (2,4-dimetyl) -1, 3 , 5-triazine, 2- [2-hydroxy-4- (2-hydroxy-3-octyloxy-propoxy) phenyl] -4,6-b¡s (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-dimethylphenyl) -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, 2-. { 2-hydroxy-4- [3- (2-ethylhexyl-1-oxy) -2-hydroxypropyloxy] phenyl} -4,6-b¡s (2,4-d.methylphenyl) -1, 3,5-triazine. 3. Metallic deactivators, for example N, N'-diphenyloxamide, N-salicylal-N'-salicyloyl hydrazine, N, N'-bis (salicyloyl) hydrazine, N, N'-bis (3,5-di-ter- butyl-4-hydroxyphenylpropionyl) hydrazine, 3-salicyloamino-1, 2,4-triazole, bis (benzylidene) oxalyl dihydrazide, oxanilide, isophthaloyl dihydrazide, sebacoyl bisphenyl hydrazide, N, N'-diacetyladipoyl dihydrazide, N, N'-bis ( salicyloyl) oxalyl dihydrazide, N, N'-bys (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-ter- butyl-6-methylphenyl) pentaerythritol diphosphite, bis (2,4 > 6-tris (tert-butylphenyl) pentaerythritol diphosphite, tristearyl sorbitol triphosphite, tetrakis (2,4-di-tert-butyl-phenyl) 4,4 '-biphenylene diphosphonyl, 6-isooctyloxy-2,4,8,10-tetra-tert-butyl-12H-dibenc [d, g] -1, 3,2-dioxaphosphocin, 6-fluoro-2,4,8, 10-tetra-tert-butyl-12-methyl-dibenc [d, g] -1, 3,2-di- oxaphosphocin, bis (2,4-di-tert-butyl-6-methylphenyl) methyl phosphite, bis (2,4-di-tert-butyl-6-methylphenyl) ethyl phosphite, 2,2 ', 2"-nitriio [trityltris (3,3', 5,5'-tetra-tert-butyl) 1, 1'-biphenyl-2,2'-diyl) fosfit or], 2-ethylhexyl (3,3 ', 5,5'-tetra-tert-butyl-1,1'-biphenyl-2,2'-dyl) phosphite. The following phosphites are especially preferred: . Hydroxylamines for example N, N-dibenzylhydroxylamine, N, N-diethylhydroxylamine, N, N-dioctylhydroxylamine, N, N, N-alkylhydroxylamine, N, N-ditetradecylhydroxylamine, N, N-dihexadecylhydroxylamine, N, N-dioctadecylhydroxylamine, N-hexadecyl-N-octadecylhydroxylamine, N-heptadecyl-N-octadecylhydroxylamine, NN-dialkylhydroxylamine derived from hydrogenated tallow amine. 6. Nitrones, for example N-benzyl-alpha-phenyl-nitrona, N-ethyl-alpha-methyl-nitrona, N-octyl-alpha-heptyl-nitrona, 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-octadecyl-alpha-pentadecyl-nitrone, N-heptadecyl-alpha- heptadecyl-nitrone, N-octadecyl-alpha-hexadecyl-nitrone, nitrone derived from NN-dialkylhydroxylamine derived from hydrogenated tallow amine. 7. Tiosynergists, for example dilauryl thiodipropionate or distearyl thiodipropionate. 8. Peroxide scavengers, for example esters of ß-thiodipropionic acid, for example the esters of lauryl, stearyl, myristyl, or tridecyl, mercaptobenzimidazole or the zinc salt of 2-mercaptobenzimidazole, zinc dibutyldithiocarbamate, dioctadecyl disulfide, pentaerythritol tetrakis (ß -dodecylmercapto) propionate. 9. Basic co-stabilizers, 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 pyrocatechol or zinc pyrocatechol.

. Nucleating agents. for example inorganic substances such as talc, 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, for example, 4-tert-butylbenzoic acid, adipic acid, diphenylacetic acid, sodium succinate or sodium benzoate; polymeric compounds such as ionic copolymers (ionomers). 11. Fillers and reinforcement agents, for example calcium carbonate, silicates, glass fibers, glass beads, 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. 12. Other additives, for example plasticizers, lubricants, emulsifiers, pigments, rheology additives, catalysts, flow control agents, optical brighteners, flameproofing agents, antistatic agents and blowing agents. 13. Benzofuranones and indolinones, for example those described in U.S. Patent 4,325,863; U.S. Patent 4,338,244; U.S. Patent 5,175,312; U.S. Patent 5,216,052; U.S. Patent 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 -te-butyl-benzofuran-2-one, 3- (3,5-dimethyl-4-pivaloyloxyphenyl) -5,7-di-tert-butyl-benzofuran-2-one, 3- (3,4-dimethylphenyl) 5,7-di-tert-butyl-benzofuran-2-one, 3- (2,3-dimethylphenyl) -5,7-di-tert-butyl-benzofuran-2-one. The co-stabilizers, with the exception of the benzofuranones listed under item 13, are added in concentrations of, for example, 0.01 to 10% based on the total weight of the polyamide, polyester or polyacetal to be stabilized.

Other preferred compositions comprise other additives in addition to components (a) and (b), in particular phenolic antioxidants, light stabilizers and / or processing stabilizers. The particularly preferred additives are phenolic antioxidants (item 1 of the list), sterically hindered amines (item 2.6 of the list), phosphites and phosphonites (item 4 of the list) and peroxide scavengers (item 8 of the list). Particularly interesting compositions are those which, in addition to components (a) and (b), comprise, as another additive, at least one compound of the type of organic phosphites or phosphites (item 4 of the list). Other preferred additional additives (stabilizers) are benzofuran-2-ones, such as those described, inter alia, in the US Pat. 4. 325,863 North American Patent 4,338,244; U.S. Patent 5,175,312 U.S. Patent 5,216,052; U.S. Patent 5,252,643 DE-A-4 316 611; DE-A-4 316 622; DE-A-4 316 876; EP-A-0 589 839, or EP-A-0 591 102. Examples of said benzofuran-2-ones are compounds of formula wherein R'n is a substituted or unsubstituted heterocyclic or carbocyclic aromatic ring system; R'12 is hydrogen; R '? 4 is hydrogen, alkyl of 1 to 12 carbon atoms, cyclopentyl, cyclohexyl or chloro; R'13 has the meaning of R'12 or R'1, or is a radical of formula or - (CH2) S-C-0R'16, O O O II II II - (CH2) S-C-N (R'17) 2, - (CH2) s-C-0-A- 0-C- (CH2) -E, O O O O II II II II - (CH2) S-C- NR'lT- A- NR'1T- C- (CH2) -E. - (CH2) -C- NR ', - A ~ 0- C- (CH2) ~ E, O O O _ (cH2) -C- N N- C- (CH2) -E, -CH2-S-R'19, -CH (C6H5) -C-OR'16 o. -D-E, wherein R'16 is hydrogen, alkyl of 1 to 8 carbon atoms; alkyl of 2 to 18 carbon atoms which is interrupted by oxygen or sulfur, dialkylaminoalkyl containing a total of 3 to 16 carbon atoms, cyclopentyl, cyclohexyl, phenyl, or phenyl which is substituted with 1 to 3 alkyl radicals which together contain no more than 18 carbon atoms; s is 0, 1 or 2; the substituents R '? 7 are each independently of one another, hydrogen, alkyl of 1 to 18 carbon atoms, cyclopentyl, cyclohexyl, phenyl, phenyl which is substituted with 1 or 2 alkyl radicals which together contain no more than 16 carbon atoms , a radical of formula -C2H4OH, or -C2H-rO-CtH2t + 1 or _ C2H _ O_ C_ R.20 or, together with the nitrogen atom binder, form a piperidine radical or a morpholine radical; t is l to 18; R'20 is hydrogen, alkyl of 1 to 22 carbon atoms, or cycloalkyl of 5 to 12 carbon atoms; A is alkylene of 2 to 22 carbon atoms which can be interrupted by nitrogen, oxygen or sulfur; R '? Β is hydrogen, alkyl of 1 to 18 carbon atoms, cyclopentyl, cyclohexyl, phenyl; phenyl or benzyl which is substituted with 1 or 2 alkyl radicals which together contain no more than 16 carbon atoms; R'ig is alkyl of 1 to 18 carbon atoms; D is -O-, -S-, -SO-, -SO2-, or -C (R'2.) 2-; the substituents R'2. are each independently hydrogen or Ci-Ciß alkyl, the two R'21 together contain 1 to 16 carbon atoms, R'21 is also phenyl or a radical of formula or (CH2) s-C-OR'16 O - (CH2) rC-N (R'17) 2 where s, R'16 and R'17 have the meanings given above; E is a radical of formula wherein R'n, R'12 and R'14 have the meanings given above; and R'15 is hydrogen, alkyl of 1 to 20 carbon atoms, cyclopentyl, cyclohexyl, chlorine or a radical of formula o O ll ll CH- C-OR'16 0 - CH - C • N (R'1 177) '; 2 wherein R '? 6 and R'17 have the meanings given above, or R'? 5, together with R '? 4 is a tetramethylene radical.

Preferred are benzofuran-2-ones, wherein R'13 is hydrogen, alkyl of 1 to 12 carbon atoms, cyclopentyl, cyclohexyl, chlorine or a radical of formula or o - (CH2) s-C-OR'16, - (CH2) S-C-N (R'17) 2 or -D-E, wherein s, R '? 6l R'17, D and E have the meanings given above, R'16 is preferably hydrogen, alkyl of 1 to 18 carbon atoms, cyclopentyl or cyclohexyl. Other preferred benzofuran-2-ones are those, wherein R'n is phenyl, or phenyl which is substituted with 1 or 2 alkyl radicals which together contain no more than 12 carbon atoms; R'12 is hydrogen; R'14 is hydrogen or alkyl of 1 to 12 carbon atoms; R'13 is hydrogen, alkyl of 1 to 12 carbon atoms, O - (CH2) s-C-OR'16 O ll - (CH2), - C-N (R'17) 2 or -D-E; R'15 is hydrogen, alkyl of 1 to 20 carbon atoms, -CH2- C-? R'16 O-CH-CN (R'17) 2, or R'15 together with R'14 is a tetramethylene radical, s, R '? 6, R'17, D and E have the meanings given at the beginning. Particularly interesting benzofuran-2-ones are those in which R'13 is hydrogen, alkyl of 1 to 12 carbon atoms, or -D-E; R'12 and R'14 are each independently of the other hydrogen or alkyl of 1 to 4 carbon atoms; and R'15 is alkyl of 1 to 20 carbon atoms, D and E have the meanings given at the beginning. Finally, benzofuran-2-ones in which R'13 is alkyl of 1 to 4 carbon atoms or -D-E; R'12 and R'14 are hydrogen; and R'15 is alkyl of 1 to 4 carbon atoms, cyclopentyl or cyclohexyl, D is a group -C (R'2?) 2-, and E is a radical of formula the substituents R'21 are identical or different, and each is alkyl of 1 to 4 carbon atoms, and R'n, R'12, R'14 and R'15 have the meanings given. The amount of additionally added benzofuran-2-ones may vary within wide limits, and may be present in the compositions of this invention in amounts of, for example, 0.0001 to 5% by weight, preferably 0.001 to 2%. by weight, more preferably from 0.01 to 2% by weight. The incorporation of component (b) and other optional additives, in component (a) [polyamide, polyester or polyacetal] is carried out by known methods, for example, before or after molding, or also by applying component (b) dissolved or dispersed, to component (a), with or without subsequent evaporation of the solvent. Component (b) can also be added to the materials to be stabilized [component (a)] in the form of a masterbatch containing these components in a concentration of, for example, 2.5 to 25.

%. Component (b) can additionally be added before or during polymerization, or before crosslinking. Component (b) can be incorporated into component (a) to be stabilized in pure form or encapsulated in waxes, oils, or polymers. The component (b) can also be sprayed on the component (a) to be stabilized. It is capable of diluting other additives (for example, the conventional additives indicated above) or their fusions, so that it can also be sprayed together with these additives on the component (a) to be stabilized. The spraying aggregate during the deactivation of the polymerization catalysts is particularly convenient, it being possible to carry out the spraying using, for example, the steam used for deactivation. Polyamides, polyesters or polyacetals stabilized in this way can be used in a very wide range of forms, typically including films, fibers, filaments, molded articles, profiles, or as binders for paint systems, in particular powder coating compositions, adhesives or putties. Component (b) is particularly suitable for use as a processing stabilizer (heat stabilizer). For this purpose, it is usefully added to component (a) before or during processing. Therefore, a preferred embodiment of this invention is the use of component (b) as a stabilizer, in particular as a processing stabilizer (heat stabilizer), to stabilize polyamides, polyesters or polyacetals against oxidative, thermal and / or induced degradation. by light.

Component (b) is distinguished by its convenient color behavior, ie, little discoloration of the polyamides, polyesters and polyacetals, during processing. Accordingly, this invention also relates to a process for the stabilization of a polyamide, polyester or polyacetal, against oxidative, thermal and / or light-induced degradation, whose process comprises incorporating, or applying to said material, at least one component (b). The following Examples illustrate the invention in greater detail. The parts and percentages are by weight.

Example 1: Stabilization of polyamide 12. 100 parts of non-stabilized polyamide granules 12 (GrilamidTL 20 G, from EMS, Switzerland) are converted to powder by cryogenic grinding, and loaded with the stabilizers listed in Table 1. This Mix is mixed in a Henschel mixer for 2 minutes at 70 ° C. The powder obtained in this way is then dried at 80 ° C for 6 hours, and then extruded in a double screw extruder (Berstorff type) at a maximum of 210 ° C, and then granulated. The granules obtained are injection molded in an injection molding apparatus (Engel type) at a maximum of 220 ° C, in weights, 1.0 mm in thickness and 67 mm in length. The yellowness indices (Yl) of these weights are determined in accordance with ASTM D 1925-70. Low Yl values denote little discoloration, high Yl values, strong discoloration of the samples. The less discoloration, the more effective the stabilizer or the stabilizing mixture is. The results are shown in Table 1.

Table 1 : a) Example of Comparison, b) Example of this invention. c) Irganox® 245 (Ciba Spezialitátenchemie AG) denotes a compound of formula AO-1 d) Irganox® 1098 (Ciba Spezialitátenchemie AG) denotes a compound of formula AO2 e) Component (b) denotes the compound of formula f) Irgafos® 168 (Ciba Spezialitátenchemie AG) denotes tris (2,4-di-tert-butylphenyl) phosphite. g) Irgafos® 12 (Ciba Spezialitátenchemie AG) denotes 2,2 ', 2"-nitrile [triethyl-tris (3,3', 5,5'-tetra-tert-butyl-1,1 '-biphenyl-2, 2'-diyl) phosphite]; Chemical Substrate record number: 80410-33-9, and represents the compound of formula B.

Example 2: Stabilization of polyamide 6. 100 parts of non-stabilized polyamide granules 6 (Ultramid®B3S, from BASF) are converted to powder by cryogenic grinding, and loaded with the stabilizers listed in Table 2. This mixture is then mix in a Henschel mixer for 2 minutes at 70 ° C. The powder obtained in this way is. then dried at 80 ° C for 6 hours, and then it is extruded in a double thyme extruder (Berstorff type) to a maximum of 240 ° C, and then it is granulated. The obtained granules are injection molded in an injection molding apparatus at a maximum of 240 ° C, to small rods, 4 x 6 mm in thickness and 50 mm in length. These rods are matured in a circulating air oven at 150 ° C. The time it takes for the impact resistance of the rods to decrease to 80 KJ / m2 is measured in hours. The longer, the better the stabilization. The results are shown in Table 2.

Table 2: Impact resistance in oven maturation test at 150 ° C See the end of Table 1 for the explanation of the footnotes a) to e).

Example 3: Stabilization of polyoxymethylene copolymer (PO) 100 parts of unstabilized POM copolymer (Hostaform® C, Hoechst) are mixed with 0.3% calcium stearate and with the stabilizers listed in Tables 3, 4 and 5. Then the powder is extruded to a maximum of 190 ° C. A part of these granules is injection molded in an injection molding apparatus at a maximum of 200 ° C, platelets, 2 mm thick, 40 mm wide and 60 mm long. The other part of the granules is injection molded in an injection molding apparatus at a maximum of 200 ° C, to small rods, 4 x 6 mm in thickness and 50 mm in length. The thermogravimetric measurement is carried out in isothermal form in part of these platelets under an air current of 220 ° C. The time until platelets lose 3%, 6% and 10% of their weight is measured in minutes. The longer, the better the stabilization. The results are shown in Table 3.

Table 3: Thermogravimetric measurement at 220 ° C See the end of Table 1 for the explanation of the footnotes a) to e). A furnace maturation test is carried out in another part of the platelets at 140 ° C. The platelets are matured in a circulating air oven at 140 ° C, and the time until the platelets lose 2% of their weight is measured in hours. The longer, the better the stabilization. The results are shown in Table 4.

Table 4: Weight loss in oven maturation test at 140 ° C See the end of Table 1 for the explanation of the footnotes a) to e). Rods 4 x 6 mm thick and 50 mm long are also subjected to a maturation test in a circulating air oven at 140 ° C, measuring the time in hours until the impact resistance of the rods decreases from the original 110 KJ / m2 to 90 KJ / m2. The longer, the better the stabilization. The results are shown in Table 5.

Table 5: Impact resistance in oven maturation test at 140 ° C See the end of Table 1 for the explanation of the footnotes a) to e).

Claims (11)

2. declares to claim as property and exclusive right: 1. A composition comprising a) a polyamide, a polyester or polyacetal that is subject to oxidative, thermal or light-induced degradation, and b) the compound of formula I
3. with the proviso that, if component (a) is a polyamide, then the composition does not contain metallic hypophosphite or copper salt of an organic acid. A composition according to claim 1, wherein the polyamide is polyamide 6, polyamide 6,6, polyamide 4,6, polyamide 11 or polyamide 12, or a copolymer thereof. 3. A composition according to claim 1, wherein the polyester is PET, PETG, or PBT, or a copolymer thereof.
4. 4. A composition according to claim 1, wherein the polyacetal is a homopolymer or a copolymer.
5. A composition according to claim 1, wherein component (b) is present in an amount of 0.01 to 1%, based on the weight of component (a).
6. 6. A composition according to claim 1, further comprising other additives in addition to components (a) and (b).
7. 7. A composition according to claim 6, wherein the other additives are phenolic antioxidants, light stabilizers and / or processing stabilizers.
8. 8. A composition according to claim 6, wherein the other additive is at least one compound of the organic phosphonite or phosphite type.
9. 9. A composition according to claim 6, wherein the other additive is at least one compound of the benzofuran-2-one type. A process for stabilizing a polyamide, polyester or polyacetal against oxidative, thermal and / or light-induced degradation, comprising incorporating or applying to said materials, at least one component (b) according to claim 1. The use of component (b) according to claim 1, as a stabilizer for the protection of polyamides, polyesters or polyacetals against oxidative, thermal and / or light-induced degradation.