Monomeric hindered amine esters of monocarboxylic resin acid and olefin polymer compositions stabilized therewith

An olefin polymer composition comprising at least one polymer and an effective stabilizing amount of at least one monomeric ester having the formula:

• ##STR2## wherein R is a saturated or unsaturated carboxyl radical having 20 carbon atoms selected from the group consisting of abietyl, neoabietyl, tetrahydroabietyl, dehydroabietyl, dihydroabietyl, pimaryl, levoprimaryl, dextropimaryl, isodextropimaryl, tetrahydropimaryl, dihydropimaryl and mixtures thereof, R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are the same or are different and are C.sub.1-8 linear or branched alkyl and R.sup.5 is hydrogen or C.sub.1-8 linear alkyl.