Patent ID: 7157511

Claim:
A composition formed by combining components comprising: a) a polyolefin; b) at least one high activity phosphite comprising an arylalkyl diphosphite having a formula, wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , and R 10 can be the same or different and are selected from hydrogen or straight-chained, branched, cyclic, acyclic, aromatic, aliphatic, mixed aliphatic, or cycloaliphatic organic radicals having from about 1 to about 20 carbon atoms per radical; c) at least one hydrolytically stable phosphite comprising a triarylphosphite having a formula: wherein R 1 , R 2 , R 3 , R 4 , and R 5 , are selected from hydrogen or straight-chained, branched, cyclic, acyclic, aromatic, aliphatic, mixed aliphatic, or cycloaliphatic organic radicals having from about 1 to about 20 carbon atoms per radical; d) optionally, a primary polymer stabilizer; e) optionally, an acid scavenger; f) optionally, an inorganic base, Lewis base, or aliphatic amine; g) optionally, water; and h) optionally, a hindered amine, wherein the at least one high activity phosphite and the at least one hydrolytically stable phosphite are present in the composition in respective amounts sufficient to raise the Phillips Color Number (PE #) with processing to a value greater than the PE # of a composition formed by combining like amounts of the polyolefin, the high activity phosphate, a hindered phenol, water, and an acid scavenger.