Lubricating compositions and methods of operating an internal combustion engine

Patent metadata

Field	Value
Publication number	US-11932825-B2
Application number	US-202017764009-A
Country	US
Kind code	B2
Filing date	Sep 24, 2020
Priority date	Sep 26, 2019
Publication date	Mar 19, 2024
Grant date	Mar 19, 2024

Abstract

The instant disclosure generally relates to lubricating compositions having an oil of lubricating viscosity, a mixture of boron-containing and boron-free dispersants, an overbased magnesium-based detergent, an overbased calcium-based detergent, a molybdenum-containing material, and, optionally, other performance additives. The instant lubricating compositions may improve one or more of cleanliness, TBN retention, fuel economy and low-speed preignition (“LSPI”).

First claim

What is claimed is:

1. An internal combustion engine lubricating composition comprising:
oil of lubricating viscosity comprising at least 50 weight percent of a Group III base oil, a Group IV base oil, or combinations thereof;
a boron-containing polyisobutenyl succinimide dispersant, wherein the boron-containing succinimide dispersant is derived from a polyisobutylene having a vinylidene content of greater than 70 mol % where the dispersant has a number average molecular weight of from 1750 to 2200 and wherein the boron-containing succinimide dispersant is present in the lubricating composition in an amount of 0.2 to 2.1 wt %;
a boron-free polyisobutenyl succinimide dispersant wherein the boron-free polyisobutenyl succinimide dispersant includes a combination of a first boron-free polyisobutenyl succinimide dispersant having a number average molecular weight of from 1150 to 1650 and a second boron-free polyisobutenyl succinimide dispersant having a number average molecular weight of from 1950 to 2500, wherein the first boron-free polyisobutylene succinimide dispersant is present in an amount of 60% to 90% by weight of the total combination of the first boron-free polyisobutenyl succinimide dispersant and the second boron-free polyisobutenyl succinimide dispersant and wherein the boron-free polyisobutenyl succinimide dispersant is present in the lubricating composition in an amount of 0.5 to 6.5 wt. %;
an overbased magnesium-based detergent in an amount to deliver at least 400 ppm magnesium to the lubricating composition;
an overbased calcium-based detergent in an amount to deliver at least 400 ppm calcium to the lubricating composition; and
a molybdenum-containing material.

2. The lubricating composition according to claim 1 , wherein the boron-free polyisobutenyl succinimide dispersant includes a first boron-free polyisobutenyl succinimide dispersant is present in the lubricating composition in an amount of from 1.8 to 2.5 wt % and a second boron-free polyisobutenyl succinimide dispersant having a number average molecular weight of from 1950 to 2500 and is present in the lubricating composition an amount of from 0.5 to 0.8 wt %.

3. The lubricating composition according to claim 1 , wherein the overbased magnesium-based detergent is present in the lubricating composition in an amount of from 0.1 to 1.5 wt %.

4. The lubricating composition according to claim 1 , wherein the overbased magnesium-based detergent is an overbased alkylbenzene sulfonate detergent having a metal ratio of at least 8.

5. The lubricating composition according to claim 1 , wherein the overbased magnesium-based detergent has a TBN (KOH/g) greater than 500.

6. The lubricating composition according to claim 1 , wherein the overbased magnesium-based detergent has a TBN (KOH/g) of from 500 to 850.

7. The lubricating composition according to claim 1 , wherein the overbased magnesium-based detergent delivers from 400 to 700 ppm magnesium to the lubricating composition.

8. The lubricating composition according to claim 1 , wherein the overbased calcium-based detergent is present in the lubricating composition in an amount of from 0.1 to 2.5 wt %.

9. The lubricating composition according to claim 1 , wherein the overbased calcium-based detergent has a metal ratio of at least 5.

10. The lubricating composition according to claim 1 , wherein the overbased calcium-based detergent has a TBN (KOH/g) from 450 to 850.

11. The lubricating composition according to claim 1 , wherein the overbased calcium-based detergent delivers from 400 to 1200 ppm calcium to the lubricating composition.

12. The lubricating composition according to claim 1 , wherein the overbased calcium-based detergent is selected from an overbased calcium salixarate detergent, an overbased calcium salicylate detergent, and mixtures thereof.

13. The lubricating composition according to claim 1 , wherein the overbased calcium-based detergent is an overbased calcium salicylate detergent.

14. The lubricating composition according to claim 1 , wherein the overbased calcium-based detergent includes a mixture of an overbased calcium salixarate detergent and an overbased calcium salicylate detergent.

15. The lubricating composition according to claim 1 , further comprising an ashless antioxidant present in an amount of at least 0.9 weight percent of the lubricating composition.

16. The lubricating composition according to claim 1 , further comprising an ashless friction modifier selected from one or more of an ester, an amide, or an imide of an alpha-hydroxy carbonyl compound, and mixtures thereof present in the lubricating composition in an amount of from 0.01 to 1.1 wt %.

17. The lubricating composition according to claim 1 , further comprising a zinc dialkyldithiophosphate anti-wear agent in an amount to deliver 200 ppm up to 1000 ppm phosphorus to the lubricating composition.

18. The lubricating composition according to claim 1 , wherein the lubricating composition is free of or substantially free of tetrapropenylphenol (pddp) and derivatives thereof.

19. The lubricating composition according to claim 1 , wherein the molybdenum-containing material is selected from a molybdenum dithiocarbamate complex, a molybdenum dithiocarbamate dimer complex, and a tri-nuclear molybdenum compound.

20. The lubricating composition according to claim 1 , wherein the molybdenum-containing material is present in an amount to provide 40 to 1200 ppm by weight molybdenum to the lubricating composition.

21. The lubricating composition according to claim 1 , wherein the molybdenum-containing material is present in an amount to provide 60 to 200 ppm by weight molybdenum to the lubricating composition.

22. A method of operating a gasoline-fueled internal combustion engine comprising supplying to an internal combustion engine a lubricating composition according to claim 1 .

23. A method for reducing low speed preignition in a gasoline-fueled internal combustion engine operating at a brake mean effective pressure (BMEP) of greater than 12 bars and at a speed of less than 3,000 RPMs comprising: supplying to said engine a lubricating composition according to claim 1 .

24. The method of claim 23 where the gasoline-fueled internal combustion engine further comprises a turbo charger.

Assignees

• Lubrizol Corp

Inventors

• Jones Craig J
• Mcdermott Ben
• Jones Joanne L
• Delbridge Ewan E
• Brewster Alex

Classifications

• C10M169/04 Primary

  Mixtures of base-materials and additives · CPC title

• C10M141/06 Primary

  at least one of them being an organic nitrogen-containing compound · CPC title

• C10M141/10 Primary

  at least one of them being an organic phosphorus-containing compound · CPC title

• C10M2203/003

  used as base material · CPC title

• C10M2203/1025

  used as base material · CPC title