Patent ID: 8691904

Claim:
A process of preparing a mixture consisting essentially of: A. at least one thiobis phenolic antioxidant, selected from the group consisting of 2,2′-thiobis(6-t-butyl-4-methylphenol); 4,4′-thiobis(2-methyl-6-t-butylphenol); 2,2′-thiobis 4-octylphenol; and 4,4′-thiobis-(2-t-butyl-5-methyl-phenol) (TBM6), B. at least one polyalkylene glycol (PAG) of a weight average molecular weight of at least 10,000, in which the thiobis phenolic antioxidant and PAG are present at a thiobis phenolic antioxidant to PAG weight ratio from 0.1:1 to 2:1, the process comprising the steps of dissolving the PAG and thiobis phenolic antioxidant in a halogenated hydrocarbon, and then removing the halogenated hydrocarbon by evaporation.