Block oligomers containing 1-hydrocarbyloxy-2,2,6,6-tetramethyl-4-piperidyl groups as stabilizers for organic materials

摘要

A product obtainable by 1) reacting a compound of the formula (alpha)with a compound of the formula (beta)in a molar ratio of 1.2:1 to 1.4:1; 2) reacting the end groups of the formula (gamma)being present in the product of the reaction 1) with e.g. dibutylamine in a molar ratio of 2:1.7 to 2:3; the reactions 1) and 2) being carried out in an organic solvent in the presence of an inorganic base; and 3) transferring the groups of the formulabeing present in the product of the reaction 2) to groups of the formulasaid transfer being carried out by reacting the product of the reaction 2) with a hydroperoxide in a hydrocarbon solvent in the presence of a peroxide decomposing catalyst. The products obtained are useful as light stabilizers, heat stabilizers and oxidation stabilizers for organic materials, in particular synthetic polymers such as polyolefins.