Synergistic mixtures of nickel-containing 2,2'-thiobis(alkylphenols) and 2-hydroxy-4-alkoxybenzophenones

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.

Dependencies are inferred from the claim text.