Lubricant composition
AssigneeIdemitsu Kosan Co., Ltd.
InventorHiroshi OKI
Life of this patent
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Abstract
A lubricating oil composition including a base oil (A) containing an olefin-based polymer (A1), a viscosity index improver (B), and an imide-based dispersant (C), in which a first olefin-based polymer (A1-1) having a kinematic viscosity at 100° C. of 3.0 mm2/s or more is contained as the olefin-based polymer (A1), a second olefin-based polymer (A1-2) having a kinematic viscosity at 100° C. of less than 3.0 mm2/s is not contained as the olefin-based polymer (A1), a content of a resin component (B1) derived from the viscosity index improver (B) is 0.01% by mass or more based on a total amount of the lubricant composition, and a content of nitrogen atoms derived from the imide-based dispersant (C) is 0.06% by mass or more based on the total amount of the lubricant composition.
Claims12
A lubricating oil composition, comprising:
- a base oil (A) containing an olefin-based polymer (A1), a viscosity index improver (B), and an imide-based dispersant (C);
- wherein a first olefin-based polymer (A1-1) having a kinematic viscosity at 100° C. of 3.0 mm2/s or more is contained as the olefin-based polymer (A1), and a content of the first olefin-based polymer (A1-1) is 30% by mass or more based on a total amount of the base oil (A);
- a second olefin-based polymer (A1-2) having a kinematic viscosity at 100° C. of less than 3.0 mm2/s is not contained as the olefin-based polymer (A1), or is contained in a content of less than 18.5% by mass based on the total amount of the base oil (A);
- a content of a resin component (B1) derived from the viscosity index improver (B) is 0.01% by mass or more based on a total amount of the lubricating oil composition;
- a content of nitrogen atoms derived from the imide-based dispersant (C) is 0.06% by mass or more based on the total amount of the lubricating oil composition;
- and
- a content ratio of the resin component (B1) derived from the viscosity index improver (B) and the first olefin-based polymer (A1-1) [(B1)/(A1-1)] is more than 0.001 in terms of a mass ratio;
- wherein the lubricating oil composition has a kinematic viscosity at 100° C. that is 5.0 mm2/s or more and less than 7.1 mm2/s;
- and
- an aniline point that is 95° C. or higher.
2:
- The lubricating oil composition according to claim 1, wherein the base oil (A) contains at least one oil selected from the group consisting of a mineral oil (A2) and a synthetic oil (A3), wherein the mineral oil (A2) and the synthetic oil (A3) are different than the first olefin-based polymer (A1-1) and the second olefin-based polymer (A1-2).
The lubricating oil composition according to claim 2, wherein a content of the mineral oil (A2) is 50% by mass or less based on the total amount of the base oil (A).
4:
- The lubricating oil composition according to claim 1, wherein a high-temperature high-shear (HTHS) viscosity at 150° C. is 2.0 mPa·s or more and less than 2.3 mPa·s.
5:
- The lubricating oil composition according to claim 1, wherein a mass average molecular weight (Mw) of the resin component (B1) is 200,000 or more.
8-9. (canceled)
Dependencies are inferred from the claim text.