Patent ID: 8178005

Claim:
A composition comprising a mixture consisting of at least two different alkylaryl phosphites having the structure: wherein R 1 , R 2 and R 3 are independently selected alkylated aryl groups of the structure: wherein R 4 is selected from the group consisting of hydrogen, t-butyl and t-amyl; R 5 is selected from the group consisting of t-butyl and t-amyl; and R 6 is hydrogen, wherein at least one of the alkylaryl phosphites has two or more alkyl groups having a different number of carbon atoms on different aryl moieties, and wherein the mixture consisting of at least two different alkylaryl phosphites is a liquid at ambient conditions and is a reaction product of a phosphorous trihalide and a mixture of 2,4-di-t-amyl phenol and 4-t-butyl phenol, in a molar ratio of 1:4 to 4:1.