Ciba-geigy Corporation

Michael H Ackerman

James Peter Galbo

Roland A Winter

Graziano Zagnoni

Roger F Malherbe

Roberto Scrima

The present invention relates to novel piperidine compounds of the formula (I) and to their use as light stabilizers, heat stabilizers and oxidation stabilizers for organic materials. The definitions of R.sub.1, R.sub.2 and R.sub.3 are given in the text. ##STR1##

Polyalkyl-4-piperidinol derivatives for use as stabilizers for organic

N-hydrocarbyloxy compounds of the formula ##STR1## where E.sub.1, E.sub.2, E.sub.3 and E.sub.4 are independently an organic radical so that the carbon atoms to which they are attached are each a quaternary carbon, R is a hydrocarbon radical and T is a divalent radical are prepared directly by the reaction of the corresponding amine or oxyl compound in a hydrocarbon organic solvent with a hydroperoxide in the presence of a metal carbonyl, metal oxide or metal alkoxide catalyst in high yield and purity. These compounds are useful as light stabilizers in diverse substrate systems.

Process for preparing N-hydrocarbyloxy derivatives of sterically

Compounds of the formula L-T, where L is an unsubstituted or substituted tetrahydro-1,4-oxazine-2-one group and T is a substituted 4-piperidinyl hindered amine moiety, are effective light stabilizers for polyolefins and other organic polymers.

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New City, NY, United States of America

Michael H Ackerman