Synergistic combination of alkoxy-substituted phosphonitrilic compounds and ortho-hindered phenolic antioxidants

摘要

A stabilizer combination for use in improving the resistance of olefin polymers to deterioration and physical properties on exposure to heat comprising A) an organic phosphonitrilic composition derived from a triphosphonitrilic halide and an hydroxy compound selected from alcohols containing one to about 20 carbon atoms and diols having the formula ##STR1## wherein X is a covalent bound or alkylene of 1 to about 12 carbon atoms, R.sub.1 and R.sub.2 are the same or different as hydrogen or alkyl having 1 to about 6 carbon atoms, and n is an integer from 1 to about 200; and B) from about 0.1 to about 25 parts by weight of an ortho- hindered phenolic primary antioxidant.