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|1. (WO2018043432) VACUUM PUMP OIL|
|Applicants:||IDEMITSU KOSAN CO.,LTD.
|Title:||VACUUM PUMP OIL|
Provided is a vacuum pump oil which has a viscosity index of less than 160, and includes one or more compounds selected from (A) a mineral oil which has a temperature gradient ∆|η*| of the complex viscosity between two points, t°C and t-10°C (provided that -15≤t≤-10), measured at an angular velocity of 6.3 rad/s using a rotary rheometer of 10 Pa∙s/°C or less, (B) a phenolic compound, and (C) an amine-based compound. The vacuum pump oil provides a good ultimate vacuum, and has excellent water separation properties, oxidation stability, and shear stability, making the vacuum pump oil suitable for a variety of applications.