Abstract: Hindered amines based on various 2,2,6,6-tetralkylated nitrogen-containing heterocyclic moieties wherein the hindered nitrogen atom on the ring is substituted with OH or OR substituents and the 4-position of the ring is substituted with a diversity of substituents are effective in protecting a variety of non-polyolefin substrates against the adverse effects of light, heat and oxygen.

Abstract: Long chain N,N-dialkylhydroxylamines represent particularly valuable stabilizers for a number of polymer substrates. Their particular value is seen in their high temperature processing stabilization of poly(arylene sulfide), such as poly(phenylene sulfide), PPS, and of selected unsaturated elastomers used to modify thermoplastics. PPS is processed at elevated temperatures (300.degree. to 425.degree. C.) at which temperatures it crosslinks readily. Process stabilizers can extend the time to crosslinking and hence the processibility of the PPS. Long chain N,N-dialkylhydroxylamines are very effective process stabilizers for PPS being far superior to phenolic antioxidants, phosphites or amines. The hydroxylamine derived from di(hydrogenated tallow)amine is particularly useful for this purpose.

Abstract: The title compounds correspond to the formula ##STR1## where R.sub.1 is tert-butyl, R.sub.2 is methyl or tert-butyl, R.sub.3, R.sub.4 and R.sub.7 are hydrogen, R.sub.5 and R.sub.8 are hydrogen or methyl, and R.sub.6 is hydrogen, alkyl of 1 to 3 carbon atoms or phenyl, and are useful as stabilizers for organic polymers and lubricating oils to counteract the degradative effects of heat, light and air.

Abstract: The title compounds correspond to the formula ##STR1## wherein A is a monovalent, bivalent, trivalent or tetravalent radical of a mono-, di-, tri- or tetraamine. These compounds are useful as stabilizers for organic polymers and lubricating oils to counteract the degradative effects of heat, light and air.