Stabilization systems from triarylphosphites and phenols

A stabilized composition consisting essentially of (a) a polymer that is derived from a singly unsaturated acyclic hydrocarbon, or mixtures or copolymers thereof;

• and (b) from 0.005 to 5% of a mixture of (1) a triarylphosphite of the general formula ##STR4## wherein R.sub.1 is tert.butyl or 1,1-dimethylpropyl, and R.sub.2 is methyl, tert.butyl or 1,1-dimethylpropyl, and (2) a hindered phenolic antioxidant selected from the group consisting of 2,6-di-tert.butyl-4-methylphenol, 2,2'-methylene-bis(6-tert.butyl-4-methylphenol), 2,2'-methylene-bis(6-tert.butyl-4-ethylphenol), 2,2'-methylene-bis(4-methyl-6-.alpha.-methylcyclohexyl) phenol, 1,1,3-tris(5-tert.butyl-4-hydroxy-2-methylphenyl) butane, 4,4'-thiobis(6-tert.butyl-3-methylphenol), 3,5-di-tert.butyl-4-hydroxybenzyl-phosphonic acid diethylester, N,N'-di-(3,5-di-tert.butyl-4-hydroxyphenylpropionyl)-hexamethylenediamine, 1,2-bis(3,5-di-tert.butyl-4-hydroxyphenyl-propionyloxy)-ethane, 1,5-bis(3,5-di-tert.butyl-4-hydroxyphenyl-propionyloxy)-2-thiapentane, 1,3-bis(3,5-di-tert.butyl-4-hydroxyphenyl-propionyloxy)-2,2-dimethylpropan e and 1,1-bis(5-tert.butyl-4-hydroxy-2-methylphenyl)-butane;
• the ratio of the phosphite to the antioxidant being from 10:1 to 1:5.