LUBRICATING BASE OIL, LUBRICATING OIL COMPOSITION CONTAINING LUBRICATING BASE OIL, AND METHOD FOR PRODUCING LUBRICATING OIL COMPOSITION

摘要

Provided is a method of lubricating a sliding part by applying a lubricating base oil containing an ester compound to the sliding part. The ester compound contains a mixture of one or more compounds represented by a general formula (1) wherein R¹ and R² independently represent a hydrogen, a methyl, a benzoyloxy, a naphthoyloxy, or general formula (2) (—O—C(═O)—R⁵), R³ and R⁴ independently represent a benzoyloxy group, a naphthoyloxy group, or general formula (2), and R⁵ represents a linear C5-21 alkyl group, a branched chain C9-21 alkyl group, or a C5-21 cycloalkyl group that may also be substituted with an alkyl chain. The mixture contains a compound in which at least one among R¹ to R⁴ is general formula (2), and the proportion, in the mixture, of a compound in which at least one among R¹ to R⁴ is a benzoyloxy group or a naphthoyloxy group is 5-100 mole %.