Patent ID: 8188170

Claim:
A stabilizing composition for polyolefins, comprising: (1) a sterically hindered phenol; and (2) a phosphite composition comprising at least two different phosphites selected from: (i) a tris(dialkylaryl)phosphite, (ii) a tris(monoalkylaryl)phosphite, (iii) a bis(diakylaryl)monoalkylaryl phosphite, and (iv) a bis(monoalkylaryl)dialkylaryl phosphite; wherein the phosphite composition is a liquid at ambient conditions, wherein the sterically hindered phenol has the structure of compound I or II: wherein: x is independently 0, 1, 2, or 3; R 1 , R 2 , and R 3 is independently hydrogen, and C 1 -C 12 alkyl, and C 5 -C 10 cycloalkyl, provided that at least one of R 1 , R 2 , and R 3 is not hydrogen; and R 4 is independently C 1 -C 6 alkyl.