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Abstract

The present disclosure provides A lubricant composition comprises an antioxidant; and an esterified polyalkylene glycol: R¹[O(R²O)_n(R³O)_m(C═O)R⁴]_p, wherein R¹ is a linear alkyl having 1 to 18 carbon atoms, a branched alkyl having 4 to 18 carbon atoms or an aryl with 6 to 30 carbon atoms; R²O is an oxypropylene moiety derived from 1,2-propylene oxide; R³O is an oxybutylene moiety derived from butylene oxide, wherein R²O and R³O are in a block or a random distribution; R⁴ is a linear alkyl with 1 to 18 carbon atoms, a branched alkyl with 4 to 18 carbon atoms or an aryl with 6 to 18 carbon atoms; n and m are each independently integers ranging from 0 to 20 wherein n+m is greater than 0, and p is an integer from 1 to 4, wherein the antioxidant is present in an amount by weight of at least 0.5% to 20% based upon the weight of the antioxidant and the esterified polyalkylene glycol and the antioxidant is soluble in the esterified polyalkylene glycol in an amount of at least 0.5% by weight. The lubricant composition may be used as an additive to form a hydrocarbon lubricant composition.

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First Claim