Heterocyclicamides of hindered 3,5-dialkyl-4-hydroxybenzoic acids and use as light stabilizers in polyolefins

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.

Dependencies are inferred from the claim text.