| abstract |
Provided is a lubricating base oil that is excellent in low-temperature fluidity and has a high viscosity index. A lubricating base oil comprising a fatty acid ester of a polyhydric alcohol, wherein the molar fraction of molecules (heteroesters) having two or more different acyl groups in one molecule is 40% or more. The polyhydric alcohol is particularly preferably at least one of neopentyl glycol, trimethylolpropane, and pentaerythritol. As the fatty acid, the acyl group is (1) a saturated linear acyl group having 6 to 10 carbon atoms, (2) A saturated linear acyl group having 12 carbon atoms and / or an unsaturated linear acyl group having 18 carbon atoms is preferable. [Selection figure] None |