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Abstract

Synthetic base oil composition comprising dialkyl aromatic compound with alkyl side chain carbon number from C₁₀ to C₂₈, or preferably C₁₁ to C₂₄, or even more preferably, C₁₂ to C₁₈, wherein the branching characteristics of the alkyl side chain has a total methyl number (TMN) determined by C¹³ NMR spectroscopy to be from more than 2.1 to less than 3.5, or preferably from 2.15 to 3.25, or even more preferably from 2.2 to 3.0, or a branching index (BI) from more than 0.1 to less than 1.5, or more preferably, 0.15 to 1.25, or even more preferably, 0.2 to 1.0. The synthetic base oil composition has a combination of high viscometric index, low volatility, superior low temperature properties, and improved thermal/oxidation stability, and is particularly suitable to be used as a premium synthetic base stock, second base oil component, or additive for lubricant and additive package applications.

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First Claim