Abstract: Compounds of the formula: ##STR1## WHEREIN R.sub.1 and R.sub.2 are each branch-chain alkyl of 3 to 8 carbon atoms and -Het is a nitrogen-containing heterocyclic moiety attached to the carbonyl carbon atom through a heterocyclic nitrogen are useful as light stabilizers in polyolefins. They may be prepared (a) by reacting the 3,5-dialkyl-4-hydroxybenzoyl chloride with the appropriate heterocyclic amine in the presence of an acid acceptor or (b) by reacting the corresponding benzoic acid with the appropriate heterocyclic amine in the presence of a carbodiimide as dehydrating agent.

Abstract: Compounds of the formula: ##STR1## wherein R.sub.1 and R.sub.2 are each branch-chain alkyl of 3 to 8 carbon atoms and R.sub.3 and R.sub.4 are each alkyl of 1 to 4 carbon atoms are useful as light stabilizers in polyolefins. They may be prepared by reacting 3,5-dialkyl-4-hydroxybenzoic acid with 4-amino-2,2-dimethyl-6,6-di(lower alkyl)piperidine in the presence of a carbodiimide as dehydrating agent.

Abstract: Compounds of the formula: ##SPC1##Wherein R.sub. 1 and R.sub. 2 are each branch-chain alkyl of 3 to 8 carbon atoms, R.sub. 3 is --CH.sub.2 CH.sub.2 OZ wherein Z is hydrogen or ##SPC2##And R.sub. 4 is hydrogen or R.sub. 3 are useful as light stabilizers in polyolefins. They may be prepared (a) by reacting the 3,5-di-alkyl-4-hydroxybenzoyl chloride with the appropriate amine in the presence of an acid acceptor or (b) by reacting the corresponding benzoic acid with the appropriate amine in the presence of a carbodiimide as dehydrating agent.

Abstract: Compounds of the formula: ##SPC1##Wherein R.sub.1 and R.sub.2 are each branch-chain alkyl of 3 to 8 carbon atoms and R.sub.3 and R.sub.4 are each hydrogen, alkyl of 1 to 18 carbon atoms, or cycloalkyl of 5 or 6 carbon atoms are useful as light stabilizers in polyolefins. They may be prepared (a) by reacting the 3,5-di-alkyl-4-hydroxybenzoyl chloride with the appropriate amine in the presence of an acid acceptor or (b) by reacting the corresponding benzoic acid with the appropriate amine in the presence of a carbodiimide as dehydrating agent.

Abstract: Compounds of the formula: ##SPC1##Wherein X is --H, --OH, or --O.; R is --H or --OH; and Q is --C.tbd.N or ##EQU1## where R' is alkyl of 1 to 18 carbon atoms or hydrogen are useful for stabilizing polymers against degradation by ultraviolet radiation.

Abstract: Compounds of the formulaWherein R is an alkyl of 12 to 30 carbon atoms and R' is a branched-chain alkyl of 3 to 12 carbon atoms and their use alone or in combination with a secondary stabilizer, such as distearyl thiodipropionate, dilauryl thiodipropionate, or pentaerythritol tetrakis(3-n-dodecylthiopropionate), for stabilizing polyolefin or acrylonitrile-butadiene-sytrene resin.