Lubricating oil composition

Patent metadata

Field	Value
Publication number	US-11965142-B2
Application number	US-202017442216-A
Country	US
Kind code	B2
Filing date	Mar 25, 2020
Priority date	Mar 29, 2019
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

A lubricating oil composition containing a base oil, an organic molybdenum compound, and a metallic detergent, wherein the metallic detergent contains calcium sulfonate, and the content of the calcium sulfonate in terms of calcium atoms is 0.12% by mass or more based on the mass of the composition, the content ratio of molybdenum atoms derived from the organic molybdenum compound to soap groups derived from the metallic detergent based on the lubricating oil composition, [Mo/soap groups], is 0.02 or more at a mass ratio, and the HTHS viscosity at 150° C. is 1.3 mPa·s or more and less than 2.3 mPa·s. The lubricating oil composition has low viscosity and excellent lubricity.

First claim

The invention claimed is:

1. A lubricating oil composition, comprising:
a base oil;
an organic molybdenum compound; and
a metallic detergent comprising a calcium-based detergent and a magnesium-based detergent,
wherein the calcium-based detergent comprises calcium sulfonate in an amount of 0.12% by mass or more in terms of calcium atoms based on the mass of the lubricating oil composition,
wherein the content of a magnesium-based detergent is less than 0.05% by mass in terms of magnesium atoms, based on total lubricating oil composition mass,
wherein the lubricating oil composition has a base number in a range of from more than 6.1 to 11.0 mg KOH/g,
wherein a [Mo/soap groups] mass content ratio of molybdenum atoms derived from the organic molybdenum compound to soap groups derived from the metallic detergent based on the lubricating oil composition is 0.06 or more, and
wherein the lubricating oil composition has an HTHS viscosity at 150° C. in a range of from 1.3 to less than 2.3 mPa·s.

2. The composition of claim 1 , comprising the organic molybdenum compound in an amount of 0.02% by mass or more and less than 0.10% by mass, based in terms of molybdenum atoms on the total lubricating oil composition mass.

3. The composition of claim 1 , comprising the magnesium-based detergent in an amount of less than 0.04% by mass in terms of magnesium atoms, based on the total lubricating oil composition mass.

4. The composition of claim 1 , wherein the organic molybdenum compound comprises at least one selected from the group consisting of molybdenum dithiocarbamate, molybdenum dithiophosphate, a molybdenum-amine complex, and a molybdenum-imide complex.

5. The composition of claim 1 , further comprising:
a viscosity index improver in an amount of 2% by mass or less, based on the total lubricating oil composition mass.

6. The composition of claim 1 , comprising neutral calcium salicylate in an amount of less than 0.01% by mass in terms of calcium atoms, based on the total lubricating oil composition mass.

7. The composition of claim 1 , having a kinematic viscosity at 100° C. in a range of from 2.0 to 7.1 mm 2 /s.

8. The composition of claim 1 , wherein (ii) the calcium-based detergent only comprises overbased calcium sulfonate; or
(iv) the calcium-based detergent only comprises overbased calcium sulfonate and neutral calcium sulfonate.

9. The composition of claim 1 , wherein a [Mo/soap groups] mass content ratio is in a range of from 0.06 to less than 2.05.

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

11. A method of reducing abrasion of an internal combustion engine, the method comprising:
driving the internal combustion engine with the lubricating oil composition of claim 1 .

12. The composition of claim 1 , comprising, based on the total lubricating oil composition mass:
the base oil in a range of from 85 to 99.5 wt. %, the base oil comprising a mineral oil,
molybdenum dithiocarbamate, molybdenum dithiophosphate, and/or molybdenum-amine complex;
overbased calcium salicylate in a range of from 0.6 to 1.7 wt. %; and
further additive(s) in up to 7.5 wt. %.

13. The composition of claim 12 , comprising the magnesium-based detergent in a range of from 0.01 to 0.03% by mass in terms of magnesium atoms, based on the total lubricating oil composition mass.

14. The composition of claim 1 , wherein the calcium-based detergent only comprises overbased calcium sulfonate.

15. The composition of claim 1 , wherein the calcium-based detergent only comprises overbased calcium salicylate and neutral calcium salicylate.

16. The composition of claim 1 , wherein the calcium-based detergent only comprises overbased calcium sulfonate and neutral calcium sulfonate.

17. The composition of claim 1 , comprising the magnesium-based detergent in a range of from 0.01 to 0.03% by mass in terms of magnesium atoms, based on the total lubricating oil composition mass.

18. The composition of claim 1 , wherein a [Mo/soap groups] mass content ratio is in a range of from 0.06 to 1.11.

19. The composition of claim 1 , consisting of, based on the total lubricating oil composition mass:
the base oil in a range of from 85 to 99.5 wt. %, the base oil comprising a mineral oil,
overbased calcium salicylate in a range of from 0.6 to 1.7 wt. %;
a magnesium based detergent in a range of from greater than 0 to 0.3 wt. %;
molybdenum dithiocarbamate, molybdenum dithiophosphate, and/or molybdenum-amine complex in a range of from greater than 0 to 1 wt. %;
borylated polybutenyl succinimide in a range of from greater than 0 to 2 wt. %;
polybutenyl succinimide in a range of from greater than 0 to 2.5 wt. %;
zinc dithiophosphate in a range of from greater than 0 to 1.1 wt. %; and
further additive(s) in up to 1.9 wt. %.

20. A lubricating oil composition, comprising:
a base oil;
an organic molybdenum compound; and
a metallic detergent comprising a calcium-based detergent and a magnesium-based detergent,
wherein the calcium-based detergent comprises calcium sulfonate in an amount of 0.12% by mass or more in terms of calcium atoms based on the mass of the lubricating oil composition,
wherein the content of a magnesium-based detergent is less than 0.05% by mass in terms of magnesium atoms, based on total lubricating oil composition mass,
wherein a [Mo/soap groups] mass content ratio of molybdenum atoms derived from the organic molybdenum compound to soap groups derived from the metallic detergent based on the lubricating oil composition is in a range of from 0.06 to less than 2.05, and
wherein the lubricating oil composition has an HTHS viscosity at 150° C. in a range of from 1.3 to less than 2.3 mPa·s.

Assignees

• Idemitsu Kosan Co

Inventors

• Fujita Shoichiro

Classifications

• C10M169/045 Primary

  the additives being a mixture of compounds of unknown or incompletely defined constitution and non-macromolecular compounds · CPC title

• C10M129/54

  containing hydroxy groups · CPC title

• C10M135/10

  Sulfonic acids or derivatives thereof · CPC title

• C10M135/18

  thiocarbamic type, e.g. containing the groups [IMAGE cpc-sch-C10M-1027.gif] · CPC title

• C10M141/08

  at least one of them being an organic sulfur-, selenium- or tellurium-containing compound · CPC title