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US 10,647,937 B2Granted
Mineral base oil and lubricating oil composition
AssigneeIdemitsu Kosan Co., Ltd.
InventorsNorihiro Kuroda, Hisao Anzai, Kenji Goto
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Abstract
Provided is a mineral base oil having a kinematic viscosity at 40° C. of 4.0 mm2/s or more and less than 6.0 mm2/s, a kinematic viscosity at 100° C. of 1.0 mm2/s or more and less than 2.0 mm2/s, and a flash point of 140° C. or higher. A lubricating oil composition containing the mineral base oil has a high flash point while having a low viscosity and thus having excellent fuel-saving performance when used as a driving system oil and the like.
Claims16
A mineral base oil having:
- a kinematic viscosity at 40° C. of 4.0 mm2/s or more and less than 6.0 mm2/s;
- a kinematic viscosity at 100° C. of 1.0 mm2/s or more and less than 2.0 mm2/s;
- a temperature gradient Δ|η*| of complex viscosity between two temperature points −10° C. and −25° C. of 0.0032 Pa·s/° C. or less as measured with a rotary rheometer under conditions at an angular velocity of 6.3 rad/s and a strain amount of 0.1 to 100%;
- and
- a flash point of 140° C. or higher.
2 more elements
A mineral base oil having:
- a kinematic viscosity at 40° C. of 4.0 mm2/s or more and less than 6.0 mm2/s;
- a kinematic viscosity at 100° C. of 1.0 mm2/s or more and less than 2.0 mm2/s;
- a flash point of 140° C. or higher;
- and
- a paraffin content (% CP) from 60 to 78.
2 more elements
Dependencies are inferred from the claim text.