Lubricating oil composition

Patent metadata

Field	Value
Publication number	US-9303229-B2
Application number	US-201314103094-A
Country	US
Kind code	B2
Filing date	Dec 11, 2013
Priority date	Dec 17, 2008
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

A lubricating oil composition having a sulfur content of up to about 0.4 wt. % and a sulfated ash content of up to about 0.5 wt. % as determined by ASTM D874 is disclosed which comprises (a) a major amount of an oil of lubricating viscosity; (b) at least one oil-soluble or dispersed oil-stable boron-containing compound having no more than about 400 ppm of boron; and (c) at least one oil-soluble or dispersed oil-stable molybdenum-containing compound having at least about 1100 ppm of molybdenum, based upon the total mass of the composition; wherein the lubricating oil composition has a ratio of sulfur to molybdenum of less than or equal to about 4:1.

First claim

What is claimed is:

1. A lubricating oil composition having a sulfur content of up to about 0.4 wt. % and a sulfated ash content of up to about 0.5 wt. % as determined by ASTM D874 and comprising (a) a major amount of an oil of lubricating viscosity; (b) at least one oil-soluble or dispersed oil-stable boron-containing compound selected from the group consisting of a borated dispersant, a borated calcium sulfonate, a borated friction modifier and mixtures thereof and having from about 40 ppm to no more than about 400 ppm of boron, based upon total mass of the composition; and (c) at least one oil-soluble or dispersed oil-stable, molybdenum succinimide complex having at least about 1100 ppm of molybdenum, based upon the total mass of the composition; wherein the lubricating oil composition has a ratio of sulfur to molybdenum of about 1.9:1 to less than or equal to about 4:1, and further wherein the sulfur content is derived from a sulfur compound selected from the group consisting of an ashless dithiocarbamate, sulfurized ester and a thiadiazole compound.

2. The lubricating oil composition of claim 1 , wherein the oil of lubricating viscosity is comprised of a mineral base oil.

3. The lubricating oil composition of claim 1 , having a ratio of sulfur to molybdenum of about 1.9:1 to less than about 3:1.

4. The lubricating oil composition of claim 1 , having a ratio of sulfur to molybdenum of about 1.9:1 to about 2.5:1.

5. The lubricating oil composition of claim 1 , wherein the oil soluble or dispersed oil-stable molybdenum succinimide complex is a sulfurized or non-sulfurized molybdenum polyisobutenyl succinimide complex.

6. The lubricating oil composition of claim 1 , wherein the sulfur is derived from an ashless dithiocarbamate.

7. The lubricating oil composition of claim 1 wherein the sulfur is derived from a bisdithiocarhamate compound of the Formula:

wherein R 13 , R 14 , R 15 , and R 16 are the same or different and are aliphatic hydrocarbyl groups having 1 to 13 carbon atoms and R 17 is an alkylene group having 1 to 8 carbon atoms.

8. The lubricating oil composition of claim 1 , having a sulfated ash content of up to about 0.4 wt. % as determined by ASTM D874.

9. The lubricating oil composition of claim 1 , which is substantially free of phosphorus.

10. The lubricating oil composition of claim 1 , which is substantially free of zinc dialkyl dithiophosphate.

11. The lubricating oil composition of claim 1 , further comprising at least one additive selected from the group consisting of metallic detergents, ashless dispersants, friction modifiers, extreme pressure agents, viscosity index improvers and pour point depressants.

12. A method of operating an internal combustion engine comprising the step of operating the internal combustion engine with a lubricating oil composition having a sulfur content of up to about 0.4 wt. % and a sulfated ash content of up to about 0.5 wt. % as determined by ASTM D874 and comprising (a) a major amount of an oil of lubricating viscosity; (b) at least one oil-soluble or dispersed oil-stable boron-containing compound selected from the group consisting of a borated dispersant, a borated calcium sulfonate, a borated friction modifier and mixtures thereof and having from about 40 ppm to no more than about 400 ppm of boron, based upon the total mass of the composition; and (e) at least one oil-soluble or dispersed oil-stable molybdenum succinimide complex having at least about 1100 ppm of molybdenum, based upon the total mass of the composition; wherein the lubricating oil composition has a ratio of sulfur to molybdenum of about 1.9:1 to less than or equal to about 4:1, and further wherein the sulfur content is derived from a sulfur compound selected from the group consisting of an ashless dithiocarbamate, a sulfurized ester and a thiadiazole compound.

13. The method of claim 12 , wherein the lubricating oil composition has a ratio of sulfur to molybdenum of about 1.9:1 to about 2.5:1.

14. The method of claim 12 , wherein the oil-soluble or dispersed oil-stable molybdenum succinimide complex is a sulfurized or non-sulfurized molybdenum polyisobutenyl succinimide complex.

15. The method of claim 12 , wherein the sulfur of the lubricating oil composition is derived from an ashless dithiocarbamate.

16. The method of claim 12 , wherein the sulfur of the lubricating oil composition is derived from a bisdithiocarbamate compound of the Formula:

wherein R 13 , R 14 , R 15 , and R 16 are the same or different and are aliphatic hydrocarbyl groups having 1 to 13 carbon atoms and R 17 is an alkylene group having 1 to 8 carbon atoms.

17. The method of claim 12 , wherein the lubricating oil composition has a sulfated ash content of up to about 0.4 wt. % as determined by ASTM D874.

18. The method of claim 12 , wherein the lubricating oil composition is substantially free of phosphorus.

19. The method of claim 12 , wherein the lubricating oil composition is substantially free of zinc dialkyl dithiophosphate.

20. An internal combustion engine lubricated with the lubricating oil composition of claim 1 .

21. The lubricating oil composition of claim 1 , wherein the borated dispersant is selected from the group consisting of a borated polyalkenyl succinic anhydride, a borated polyalkenyl succinimide and mixtures thereof.

22. The lubricating oil composition of claim 1 , wherein the borated friction modifier is selected from the group consisting of a borated fatty epoxide, a borated alkoxylated fatty amine, a borated glycerol ester and mixtures thereof.

23. The method of claim 12 , wherein the borated dispersant is selected from the group consisting of a borated polyalkenyl succinic anhydride, a borated polyalkenyl succinimide and mixtures thereof.

24. The method of claim 12 , wherein the borated friction modifier is selected from the group consisting of a borated fatty epoxide, a borated alkoxylated fatty amine, a borated glycerol ester and mixtures thereof.

Assignees

• Chevron Oronite Co
• Chevron Usa Inc

Inventors

• Nelson Kenneth D
• Boffa Alexander B
• Kleiser William M
• Stults Stephen D
• Mcgeehan James A
• Van Dam Wim
• Cherpeck Richard E

Classifications

• C10N2040/25

  Internal-combustion engines · CPC title

• C10N2040/252

  Diesel engines · CPC title

• C10N2060/14

  by boron or a compound containing boron · CPC title

• C10N2030/43

  Sulfur free or low sulfur content compositions · CPC title

• C10N2040/255

  Gasoline engines · CPC title