Lubricant composition

Patent metadata

Field	Value
Publication number	US-12359144-B2
Application number	US-202218552839-A
Country	US
Kind code	B2
Filing date	Mar 17, 2022
Priority date	Mar 31, 2021
Publication date	Jul 15, 2025
Grant date	Jul 15, 2025

Abstract

An object of the present invention is to provide a lubricating oil composition which, even while exhibiting an excellent friction reducing effect by combining plural types of molybdenum-based friction modifiers, has excellent high-temperature detergency, oxidation stability and copper corrosion resistance. The object has been achieved by a lubricating oil composition containing a base oil (A), a molybdenum-based friction modifier (B), a metal-based detergent (C), and an ash-free dispersant (D), wherein the molybdenum-based friction modifier (B) contains two or more selected from the group consisting of a binuclear molybdenum dithiocarbamate (B1), a trinuclear molybdenum dithiocarbamate (B2), and a molybdenum-amine complex (B3); the metal-based detergent (C) contains a sulfur atom; the ash-free dispersant (D) contains a nitrogen atom; the acid value derived from the binuclear molybdenum dithiocarbamate (B1) and the trinuclear molybdenum dithiocarbamate (B2) is less than 0.04 mgKOH/g; the content ratio of a sulfur content (C S ) derived from the metal-based detergent (C) to a nitrogen content (D N ) derived from the ash-free dispersant (D), [(C S )/(D N )] is 0.30 to 0.85 in terms of the mass ratio; and the phosphorus content based on the total amount of the lubricating oil composition is more than 0.04% by mass and less than 0.10% by mass.

First claim

The invention claimed is:

1. A lubricating oil composition, comprising:
a base oil;
a molybdenum-based friction modifier;
a metal-based detergent; and
an ash-free dispersant,
wherein the molybdenum-based friction modifier includes two or more selected from the group consisting of a binuclear molybdenum dithiocarbamate, a trinuclear molybdenum dithiocarbamate, and a molybdenum-amine complex, the metal-based detergent includes a sulfur atom, the ash-free dispersant includes a nitrogen atom, an acid value derived from the binuclear molybdenum dithiocarbamate and/or the trinuclear molybdenum dithiocarbamate is less than 0.04 mgKOH/g, a content ratio of a sulfur content derived from the metal-based detergent to a nitrogen content derived from the ash-free dispersant is from 0.30 to 0.85 in terms of mass ratio, and a phosphorus content based on a total amount of the lubricating oil composition is more than 0.04% by mass and less than 0.10% by mass.

2. The lubricating oil composition according to claim 1 , wherein the sulfur content based on the total amount of the lubricating oil composition is 0.35% by mass or less.

3. The lubricating oil composition according to claim 1 , wherein the phosphorus content based on the total amount of the lubricating oil composition is from 0.06% by mass to 0.08% by mass.

4. The lubricating oil composition according to claim 1 , wherein a molybdenum content based on the total amount of the lubricating oil composition is from 0.05% by mass to 0.12% by mass.

5. The lubricating oil composition according to claim 1 , wherein the metal-based detergent includes at least one selected from the group consisting of a calcium-based detergent and a magnesium-based detergent.

6. The lubricating oil composition according to claim 5 , wherein the metal-based detergent includes the calcium-based detergent, and a calcium content based on the total amount of the lubricating oil composition is from 0.10% by mass to 0.20% by mass.

7. The lubricating oil composition according to claim 5 , wherein the metal-based detergent includes the magnesium-based detergent, and a magnesium content based on the total amount of the lubricating oil composition is from 0.03% by mass to 0.07% by mass.

8. The lubricating oil composition according to claim 5 , wherein the metal-based detergent includes the calcium-based detergent and the magnesium-based detergent, a calcium content based on the total amount of the lubricating oil composition is from 0.10% by mass to 0.20% by mass, and a magnesium content based on the total amount of the lubricating oil composition is from 0.03% by mass to 0.07% by mass.

9. The lubricating oil composition according to claim 1 , wherein the binuclear molybdenum dithiocarbamate is a compound of formula (b1-3),

where R 1 , R 2 , R 3 , and R 4 are each independently represent a group of short-chain substituent groups which are aliphatic hydrocarbon groups having 4 to 12 carbon atoms or a group of long-chain substituent groups which are aliphatic hydrocarbon groups having 13 to 22 carbon atoms, provided that a molar ratio between the group of short-chain substituent groups and the group of long chain substituent groups in a total molecule of the binuclear molybdenum dithiocarbamate is from 0.10 to 2.0, and X 1 , X 2 , X 3 and X 4 are each independently an oxygen atom or a sulfur atom.

10. The lubricating oil composition according to claim 1 , further comprising a metal deactivator.

11. The lubricating oil composition according to claim 1 , wherein an ash-free friction modifier content based on the total amount of the lubricating oil composition is less than 0.1% by mass.

12. An internal combustion engine comprising the lubricating oil composition of claim 1 .

13. A method of lubricating an internal combustion engine, comprising:
lubricating the internal combustion engine with the lubricating oil composition of claim 1 .

14. A method of producing a lubricating oil composition, comprising:
mixing a base oil, a molybdenum-based friction modifier, a metal-based detergent, and an ash-free dispersant,
wherein the molybdenum-based friction modifier includes two or more selected from the group consisting of a binuclear molybdenum dithiocarbamate, a trinuclear molybdenum dithiocarbamate, and a molybdenum-amine complex, the metal-based detergent includes a sulfur atom, the ash-free dispersant includes a nitrogen atom, an acid value derived from the binuclear molybdenum dithiocarbamate and/or the trinuclear molybdenum dithiocarbamate is less than 0.04 mgKOH/g, a content ratio of a sulfur content derived from the metal-based detergent to a nitrogen content derived from the ash-free dispersant is adjusted to be from 0.30 to 0.85 in terms of mass ratio, and a phosphorus content based on a total amount of the lubricating oil composition is adjusted to be more than 0.04% by mass and less than 0.10% by mass.

15. The lubricating oil composition according to claim 2 , wherein the phosphorus content based on the total amount of the lubricating oil composition is from 0.06% by mass to 0.08% by mass.

16. The lubricating oil composition according to claim 2 , wherein a molybdenum content based on the total amount of the lubricating oil composition is from 0.05% by mass to 0.12% by mass.

17. The lubricating oil composition according to claim 2 , wherein the metal-based detergent includes at least one selected from the group consisting of a calcium-based detergent and a magnesium-based detergent.

18. The lubricating oil composition according to claim 17 , wherein the metal-based detergent includes the calcium-based detergent, and a calcium content based on the total amount of the lubricating oil composition is from 0.10% by mass to 0.20% by mass.

19. The lubricating oil composition according to claim 17 , wherein the metal-based detergent includes the magnesium-based detergent, and a magnesium content based on the total amount of the lubricating oil composition is from 0.03% by mass to 0.07% by mass.

20. The lubricating oil composition according to claim 17 , wherein the metal-based detergent includes the calcium-based detergent and the magnesium-based detergent, a calcium content based on the total amount of the lubricating oil composition is from 0.10% by mass to 0.20% by mass, and a magnesium content based on the total amount of the lubricating oil composition is from 0.03% by mass to 0.07% by mass.

Assignees

• Idemitsu Kosan Co

Inventors

• Sunahara Kenji
• Fujita Shoichiro
• Kubota Masaya

Classifications

• C10N2040/25

  Internal-combustion engines · CPC title

• C10M2227/066

  derived from Mo or W · CPC title

• C10M2219/068

  Thiocarbamate metal salts · CPC title

• C10M163/00 Primary

  Lubricating compositions characterised by the additive being a mixture of a compound of unknown or incompletely defined constitution and a non-macromolecular compound, each of these compounds being essential · CPC title

• C10M159/18

  Complexes with metals · CPC title