Piperidyl carboxylates

A compound having the formula:

• ##STR156## wherein [R.sup.I and R.sup.II are the same or different and each is a straight or branched alkyl group, having from 1 to 4 carbon atoms, or R.sup.I or R.sup.II, together with the carbon atom to which they are each attached form a cycloalkyl group having from 5 to 12 carbon atoms;] Y is [an] alkyl [group, having] of from 5 to 20 carbon atoms, alkenyl [having] of from 2 to 20 carbon atoms, or aralkyl of from 7 to 9 carbon atoms, n is 1 or 2, and R , when n is 1, is hydrogen, alkyl of 1 to 20 carbon atoms, alkenyl of 2 to 20 carbon atoms, cycloalkyl of 5 to 12 carbon atoms, aralkyl of 7 to 14 carbon atoms, 3,5-di-t-butyl-4-hydroxyphenyl, 3,5-di-t-butyl-4-hydroxybenzyl, 2-(3,5-di-t-butyl-4-hydroxyphenyl)ethyl or aryl of 6 to 12 carbon atoms, unsubstituted or substituted by alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms or halo or, when n is 2, alkylene having from 1 to 20 carbon atoms, cycloalkylene having from 5 to 12 carbon atoms, arylene of 6 to 20 carbon atoms , vinylene, propenylene, p-xylylene, [the group] --CH.sub.2 CH.sub.2 SCH.sub.2 CH.sub.2 -- or R is [absent] a carbon-carbon bond;
• [and] or a salt thereof selected from phosphate, carbonate, sulfate, chloride, acetate, stearate, maleate, citrate, tertrate, oxalate, benzoate and substituted carbamate.