The whiteness and stability of a polyolefin have been found to be improved upon
addition of a first phosphite, an arylalkyl diphosphite, and a second phosphite
selected from a second arylalkyl disphosphite or a triarylphosphite. In addition,
the addition of a triarylphosphite with an arylalkyl disphoshite has been found
to improve the hygroscopic nature and the hydrolytic stability of the arylalkyl disphosphite.
