Patent ID: 8633267

Claim:
A composition comprising a mixture of alkylaryl phosphites and from 0 to 10% by weight of one or more free phenol based on the combined weight of all phosphites and said free phenol in the composition, said mixture of alkylaryl phosphites comprising; one or more phosphites of structure one or more phosphites of structure and one or more phosphites of structure wherein a, b, c, and d are independently selected from 0, 1, 2, and 3, provided that a+b=3 and c+d=3, e, f, g and h are independently selected from 0, 1 and 2, provided that e+f+g+h=3, e+f=1 or 2, and g+h=1 or 2, each Ar is phenyl, each R 8 is a straight or branched C 1 -C 18 alkyl group having the same number of carbon atoms, each R 9 is a straight or branched C 1 -C 18 alkyl group having the same number of carbon atoms, provided that R 8 has a different number of carbon atoms than R 9 , and the molar ratio of R 8 groups to R 9 groups in the phosphite mixture is from 1:10 to 10:1, which mixture of alkylaryl phosphites comprises one or more tris(monoalkylaryl) phosphites in an amount from 20 to 80 weight percent one or more bis(monoalkylaryl)dialkylaryl phosphites in an amount from 15 to 60 weight percent, one or more bis(dialkylaryl)alkylaryl phosphites in an amount from 2 to 20 weight percent, one or more tris(dialkylaryl) phosphites in an amount from 0.1 to 20 weight percent based on the total weight of all phosphites in the phosphite composition, and said one or more free phenol is selected from the group consisting of wherein R 8 and R 9 are as defined above, wherein the composition consisting of the mixture of alkylaryl phosphites and free phenol is a liquid at ambient conditions.