Abstract: Useful for the stabilization of polymers, especially polypropylene and polyethylene are esters of 3-tert-butyl or 3-tert-butyl-5-alkyl-4-hydroxyphenyl(alkane) carboxylic acids with oxethylates of bis-(4- or 2-hydroxyphenyl) alkanes, oxides, sulfides or sulfones, with oxethylates of tris-(4-hydroxyphenyl) alkanes, or with oxethylates of 1,3,5-tris-(4-hydroxyphenyl isopropylidene) aryls, the oxethylate preferably comprising a hydroxyethoxy group substituted for each hydroxyl group.

Abstract: Esters of 3-tert-butyl- and 3-tert-butyl-5-alkyl-4-hydroxyphenyl(alkane) carboxylic acids of Formula I ##STR1## with oxethylates of polyhydroxyaromatics of 2-6 hydroxy groups of general Formulae II and III, containing 1-6 oxethylate units, ##STR2## with X=(CH.sub.2).sub.q OHX'=(CH.sub.2).sub.r OHwherein q, r, s can be 0 or 1, preferably 0,X"=(CH.sub.2).sub.s OHR,R', R"=H, alkyl, halogen, ##STR3## preferably 4-hydroxyphenyl, n=2 to 6 for z or z'=0, preferably 2 or 3, andn=1 to 5 for z or z'.noteq.0, preferably 2 or 3,o+p=n0.ltoreq.a, z.ltoreq.a+z.ltoreq.6-n (in Formula II)0.ltoreq.b, c, z'.ltoreq.4.ltoreq.8-n (in Formula III).are useful for the stabilization of polymers.