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US 12,180,433 B2Granted
Lubricating oil composition, method for using lubricating oil composition, and method for producing lubricating oil composition
AssigneeIdemitsu Kosan Co., Ltd.
InventorsTokue Sato, Kenji Goto
Life of this patent
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Abstract
A lubricating oil composition contains a base oil and a rust inhibitor, in which the base oil has a gas chromatogram measured by gas chromatography satisfying the particular condition (α), and the rust inhibitor is at least one selected from a first rust inhibitor, a second rust inhibitor, a third rust inhibitor, and a fourth rust inhibitor, and satisfies the particular condition (β).
Claims20
A lubricating oil composition, comprising:
- a base oil;
- and
- a rust inhibitor,
- wherein a gas chromatogram of the base oil measured according to ASTM D7500 with a gas chromatography distillation equipment has a peak in a range of a number of carbon atoms of more than 11 and less than 23, the rust inhibitor includes, based on a total amount of the lubricating oil composition, at least one selected from the group consisting of more than 0.02% by mass and less than 0.16% by mass of a first rust inhibitor, more than 0.05% by mass and 0.5% by mass or less of a second rust inhibitor, 0.005% by mass or more and less than 0.05% by mass of a third rust inhibitor, and more than 0.05% by mass and less than 0.20% by mass of a fourth rust inhibitor, where the first rust inhibitor is a combination of a succinate and a sorbitan fatty acid ester, the second rust inhibitor is a carboxylic acid amide, the third rust inhibitor is a neutral alkyl phosphate, and the fourth rust inhibitor is a combination of a fatty acid having 12 or more carbon atoms and a primary amine, and the base oil has a flash point of 250° C. or more by Cleveland open cup method, a density of 0.8300 g/cm3 or less at 15° C., a viscosity index of 100 or more, and a kinematic viscosity of 7.50 mm2/s or more and 9.00 mm2/s or less at 100° C.
1 more element
A method for producing a lubricating oil composition, comprising:
- mixing a base oil and a rust inhibitor,
- wherein a gas chromatogram of the base oil measured according to ASTM D7500 with a gas chromatography distillation equipment has a peak in a range of a number of carbon atoms of more than 11 and less than 23, the rust inhibitor includes, based on a total amount of the lubricating oil composition, at least one selected from the group consisting of more than 0.02% by mass and less than 0.16% by mass of a first rust inhibitor, more than 0.05% by mass and 0.5% by mass or less of a second rust inhibitor, 0.005% by mass or more and less than 0.05% by mass of a third rust inhibitor, and more than 0.05% by mass and less than 0.20% by mass of a fourth rust inhibitor, where the first rust inhibitor is a combination of a succinate and a sorbitan fatty acid ester, the second rust inhibitor is a carboxylic acid amide, the third rust inhibitor is a neutral alkyl phosphate, and the fourth rust inhibitor is a combination of a fatty acid having 12 or more carbon atoms and a primary amine, and the base oil has a flash point of 250° C. or more by Cleveland open cup method, a density of 0.8300 g/cm3 or less at 15° C., a viscosity index of 100 or more, and a kinematic viscosity of 7.50 mm2/s or more and 9.00 mm2/s or less at 100° C.
Dependencies are inferred from the claim text.