Abstract: A mixture for stabilizing polyolefins containing A) either (A1) at least one compound of the formula in which R1 is for example C1-C10alkyl; R2 is C3-C10alkylene; R3 is for example hydrogen or C1-C8alkyl; and n1 is a number from 2 to 50; or (A2) a product obtainable by reacting a product—obtained by reaction of a polyamine of the formula in which n2′, n2″ and n2′″ are a number from 2 to 12 with cyanuric chloride—with a compound of the formula wherein R4 is for example hydrogen or C1-C12alkyl; and R5 is as defined for R3 and B) magnesium oxide, magnesium hydroxide, C) zinc oxide, zinc hydroxide or an organic salt of zinc or magnesium, or a hydrotalcite; and at least one of C1) an UV absorber or C2) 2 pigment.

Abstract: The present invention relates to polyolefin compositions which comprise as UV absorber a synergistic mixture of

Abstract: A particularly good stabilization against oxidative and light-induced degradation of polyolefines is obtained by adding compounds of the formula I ##STR1## in which R.sup.1 is alkyl, X is dialkylamino, morpholino or alkoxy, and R.sup.2 is hydrogen, alkyl, hydroxyalkyl, allyl, acetyl or acryloyl.

Abstract: A particularly good stabilization against oxidative and light-induced degradation of polyolefines is obtained by adding compounds of the formula I ##STR1## in which R.sup.1 is not hydrogen.

Abstract: The invention relates to the stabilization of organic polymers against degradation by light by the addition of (a) a light stabilizer of the formula ##STR1## in which R is hydrogen or methyl and A is an alkylene radical, and (b) an oxide, hydroxide, carboxylate, enolate or phenate of magnesium or zinc.

Abstract: Di-(2,2,6,6-tetramethyl-4-piperidinyl) succinate and glutarate are very effective light stabilizers for thermoplastics, particularly for polyolefins.

Abstract: Synergistic light stabilizer combinations comprising(a) a compound of formula I ##STR1## wherein m is 2 or 3 and R is hydrogen, C.sub.1 -C.sub.4 alkyl, 2-hydroxyethyl, 2-hydroxypropyl, allyl, benzyl, acetyl or acryloyl, and(B) a compound which contains at least one group of formula II ##STR2## and has a molecular weight higher than 700, are most suitable for stabilizing organic polymers, especially polyolefins.

Abstract: The invention relates to polyolefines stabilized against damage caused by light and containing(A) at least one polyalkylpiperidine light stabilizer,(B) an organic salt of zinc or magnesium and(C) either(C.sub.1) a UV absorber or(C.sub.2) a pigment or(C.sub.3) a UV absorber and a pigment.

Abstract: Compounds of the formula (I) ##STR1## wherein R.sub.1 and R.sub.5 are independently hydrogen, C.sub.1 -C.sub.12 -alkyl, C.sub.5 -C.sub.7 -cycloalkyl or a group of the formula (II), ##STR2## R.sub.2, R.sub.3 and R.sub.4 are independently C.sub.2 -C.sub.12 -alkylene, R is a group of the formula (III) ##STR3## wherein R.sub.6 is C.sub.2 -C.sub.8 -dialkylamino, C.sub.1 -C.sub.4 -alkoxy, a 5-membered to 7-membered heterocyclic group containing a nitrogen atom which is attached to the triazine residue or a group of the formula (IV), ##STR4## R.sub.7 and R.sub.8 are independently C.sub.1 -C.sub.12 -alkyl, C.sub.5 -C.sub.7 -cycloalkyl, benzyl or a group of the formula (II), subject to the proviso that both, R.sub.1 and R.sub.5 are different from hydrogen, if R is a group ##STR5## are useful as light stabilizers, heat stabilizers and/or oxidation stabilizers for organic materials, in particular synthetic polymers.

Abstract: The present invention relates to a stabilizer system containing two high-molecular polyalkylpiperidines, the use thereof for stabilizing organic material and the organic material which has been protected by means of the stabilizer system mentioned against degradation induced by light.

Abstract: Compounds of the formula (I) ##STR1## wherein R.sub.1 and R.sub.5 are independently hydrogen, C.sub.1 -C.sub.12 -alkyl, C.sub.5 -C.sub.7 -cycloalkyl or a group of the formula (II), ##STR2## R.sub.2, R.sub.3 and R.sub.4 are independently C.sub.2 -C.sub.12 -alkylene, R is a group of the formula (III) ##STR3## wherein R.sub.6 is C.sub.2 -C.sub.8 -dialkylamino, C.sub.1 -C.sub.4 -alkoxy, a 5-membered to 7-membered heterocyclic group containing a nitrogen atom which is attached to the triazine residue or a group of the formula (IV), ##STR4## R.sub.7 and R.sub.8 are independently C.sub.1 -C.sub.12 -alkyl, C.sub.5 -C.sub.7 -cycloalkyl, benzyl or a group of the formula (II), subject to the proviso that both, R.sub.1 and R.sub.5 are different from hydrogen, if R is a group ##STR5## are useful as light stabilizers, heat stabilizers and/or oxidation stabilizers for organic materials, in particular synthetic polymers.

Abstract: Stabilizer systems containing at least two Ni-containing light-stabilizers in which nickel (which, in class 2, optionally contains an additional ligand) forms a complex compound with a compound selected from the group consisting of the classes:1. 2-hydroxy-4-alkoxybenzophenones2. 2,2'-thiobis[4-alkylphenols]3. 3,5-dialkyl-4-hydroxybenzoic acid monoalkyl esters4. 3,5-dialkyl-4-hydroxybenzylphosphonic acid monoalkyl esters5. 1-phenyl-3-methyl-4-acyl-5-hydroxypyrazole,in which the radicals generally contained are appropriately substituted. After being incorporated into the corresponding polyolefins, these stabilizer systems have a synergistic effect which prevents or at least greatly retards decomposition initiated by light and/or oxygen.

Abstract: Low-molecular and high-molecular polyalkylpiperidines are suitable as a synergistic mixture for stabilizing organic material, in particular organic polymers. The compounds are substances known per se. Thus, for example, the mixture of ##STR1## is distinguished by a pronounced synergism.

Abstract: Stabilizer systems containing at least two Ni-containing light-stabilizers in which nickel (which, in class 2, optionally contains an additional ligand) forms a complex compound with a compound selected from the group consisting of the classes:(1) 2-hydroxy-4-alkoxybenzophenones(2) 2,2'-thiobis[4-alkylphenols](3) 3,5-dialkyl-4-hydroxybenzoic acid monoalkyl esters(4) 3,5-dialkyl-4-hydroxybenzylphosphonic acid monoalkyl esters(5) 1-phenyl-3-methyl-4-acyl-5-hydroxypyrazole,in which the radicals generally contained are appropriately substituted. After being incorporated into the corresponding polyolefins, these stabilizer systems have a synergistic effect which prevents or at least greatly retards decomposition initiated by light and/or oxygen.

Abstract: Hydroxybenzylmalonic acid derivatives of 1-acylpiperidin-4-ols or 1-acyl-4-aminopiperidines respectively having the formula ##STR1## WHEREIN R.sub.a, R.sub.b, R.sub.c, R.sub.d are hydrocarbon residues, R.sub.e is H or lower alkyl, R.sub.1 is a hydroxybenzyl residue, R.sub.2 is H or R.sub.1, X is --O-- or --NH-- and Y is hydrogen, a hydrocarbon, amino, alkoxy or phenoxy residue are excellent stabilizers for plastics material, especially for polyolefins. They act against heat aging as well as against light aging. The compounds may be prepared by acylation of the corresponding NH compounds or by hydroxybenzylation of the corresponding malonic acid derivatives.