Lubricating oil compositions with engine wear protection

Patent metadata

Field	Value
Publication number	US-10000721-B2
Application number	US-201514979719-A
Country	US
Kind code	B2
Filing date	Dec 28, 2015
Priority date	Dec 30, 2014
Publication date	Jun 19, 2018
Grant date	Jun 19, 2018

Abstract

A method for improving wear control, while maintaining or improving fuel efficiency, in an engine or other mechanical component lubricated with a lubricating oil by using as the lubricating oil a formulated oil. The formulated oil has a composition including a lubricating oil base stock as a major component, and (i) at least one transition metal salt of a carboxylic acid (e.g., zinc stearate) or (ii) a mixture of at least one transition metal salt of a carboxylic acid (e.g., zinc stearate) and at least one detergent (i.e., an alkali metal or alkaline earth metal salt of an organic acid, or an alkali metal or alkaline earth metal salt of an inorganic acid, or an alkali metal or alkaline earth metal salt of a phenol, or mixtures thereof (e.g., calcium salicylate and/or magnesium sulfonate)), as a minor component. The lubricating oils are useful in internal combustion engines.

First claim

What is claimed is:

1. A method for improving wear control, while maintaining or improving fuel efficiency, in an engine or other mechanical component lubricated with a lubricating oil by using as the lubricating oil a formulated oil, said formulated oil having a composition comprising a lubricating oil base stock as a major component; and at least one metal salt of a carboxylic acid, as a minor component; wherein the minor component contains no sulfur or phosphorus; wherein the metal is selected from the group consisting of palladium (Pd), silver (Ag), gold (Au), zinc (Zn), and mixtures thereof; wherein the carboxylic acid is selected from the group consisting of an aliphatic carboxylic acid, a cycloaliphatic carboxylic acid, an aromatic carboxylic acid, and mixtures thereof; wherein said formulated oil is free of phosphorous; and wherein wear control is improved and fuel efficiency is maintained or improved as compared to wear control and fuel efficiency achieved using a lubricating oil containing a minor component other than the at least one metal salt of a carboxylic acid.

2. The method of claim 1 wherein the lubricating oil base stock comprises a Group I, Group II, Group III, Group IV or Group V base oil.

3. The method of claim 1 wherein the carboxylic acid is an aliphatic, saturated, unbranched carboxylic acid having from 8 to 26 carbon atoms, and mixtures thereof.

4. The method of claim 1 wherein the carboxylic acid is selected from the group consisting of caprylic acid (C8), pelargonic acid (C9), capric acid (C10), undecylic acid (C11), lauric acid (C12), tridecylic acid (C13), myristic acid (C14), pentadecylic acid (C15), palmitic acid (C16), margaric acid (C17), isostearic acid (C18), stearic acid (C18), nonadecylic acid (C19), arachidic acid (C20), heneicosylic acid (C21), behenic acid (C22), tricosylic acid (C23), lignoceric acid (C24), pentacosylic acid (C25), cerotic acid (C26), and mixtures thereof.

5. The method of claim 1 wherein the at least one metal salt of a carboxylic acid comprises zinc stearate, silver stearate, palladium stearate, zinc palmitate, silver palmitate, palladium palmitate, or mixtures thereof.

6. The method of claim 1 wherein the at least one metal salt of a carboxylic acid is present in an amount of from 0.01 weight percent to 5 weight percent, based on the total weight of the formulated oil.

7. The method of claim 1 wherein the formulated oil further comprises at least one metal salt of an organic acid, or at least one metal salt of an inorganic acid, or at least one metal salt of a phenol, or mixtures thereof, as a minor component.

8. The method of claim 7 wherein the metal comprises an alkali metal, an alkaline earth metal, or mixtures thereof.

9. The method of claim 8 wherein the metal comprises calcium (Ca), or magnesium (Mg), or mixtures thereof.

10. The method of claim 7 wherein the at least one metal salt of an organic acid, the at least one metal salt of an inorganic acid, or the at least one metal salt of a phenol comprises calcium sulfonate, magnesium sulfonate, calcium salicylate, magnesium salicylate, calcium phenate, magnesium phenate, or mixtures thereof.

11. The method of claim 7 wherein the at least one metal salt of an organic acid, the at least one metal salt of an inorganic acid, or at least one metal salt of a phenol is present in an amount of from 0.01 weight percent to 5 weight percent, based on the total weight of the formulated oil.

12. The method of claim 1 wherein the lubricating oil base stock is present in an amount of from 70 weight percent to 95 weight percent, based on the total weight of the formulated oil.

13. The method of claim 1 wherein the formulated oil further comprises one or more of an antiwear additive, viscosity modifier, antioxidant, detergent, dispersant, pour point depressant, corrosion inhibitor, metal deactivator, seal compatibility additive, anti-foam agent, inhibitor, and anti-rust additive.

14. A method for improving wear control, while maintaining or improving fuel efficiency, in an engine or other mechanical component lubricated with a lubricating oil by using as the lubricating oil a formulated oil, said formulated oil having a composition comprising a lubricating oil base stock as a major component; and a mixture of (i) at least one metal salt of a carboxylic acid, and (ii) at least one metal salt of an organic acid, or at least one metal salt of an inorganic acid, or at least one metal salt of a phenol, or mixtures thereof, as minor components; wherein, for the at least one metal salt of a carboxylic acid, the metal is selected from the group consisting of palladium (Pd), silver (Ag), gold (Au), zinc (Zn), and mixtures thereof, and the carboxylic acid is selected from the group consisting of an aliphatic carboxylic acid, a cycloaliphatic carboxylic acid, an aromatic carboxylic acid, and mixtures thereof; wherein, for the at least one metal salt of an organic acid, the at least one metal salt of an inorganic acid, the at least one metal salt of a phenol, or mixtures thereof, the metal comprises an alkali metal, an alkaline earth metal, or mixtures thereof, and the organic or inorganic acid is selected from the group consisting of an aliphatic organic, a cycloaliphatic organic, an aromatic organic, and mixtures thereof; wherein said formulated oil is free of phosphorous; and wherein wear control is improved and fuel efficiency is maintained or improved as compared to wear control and fuel efficiency achieved using a lubricating oil containing minor components other than the mixture of (i) the at least one metal salt of a carboxylic acid, and (ii) the at least one metal salt of an organic acid, or the at least one metal salt of an inorganic acid, or the at least one metal salt of a phenol, or mixtures thereof.

15. The method of claim 14 wherein the lubricating oil base stock comprises a Group I, Group II, Group III, Group IV or Group V base oil.

16. The method of claim 14 wherein the carboxylic acid is an aliphatic, saturated, unbranched carboxylic acid having from 8 to 26 carbon atoms, and mixtures thereof.

17. The method of claim 14 wherein the carboxylic acid is selected from the group consisting of caprylic acid (C8), pelargonic acid (C9), capric acid (C10), undecylic acid (C11), lauric acid (C12), tridecylic acid (C13), myristic acid (C14), pentadecylic acid (C15), palmitic acid (C16), margaric acid (C17), isostearic acid (C18), stearic acid (C18), nonadecylic acid (C19), arachidic acid (C20), heneicosylic acid (C21), behenic acid (C22), tricosylic acid (C23), lignoceric acid (C24), pentacosylic acid (C25), cerotic acid (C26), and mixtures thereof.

18. The method of claim 14 wherein the at least one metal salt of a carboxylic acid comprises zinc stearate, silver stearate, palladium stearate, zinc palmitate, silver palmitate, palladium palmitate, or mixtures thereof.

19. The method of claim 14 wherein the at least one metal salt of a carboxylic acid is present in an amount of from 0.01 weight percent to 5 weight percent, based on the total weight of the formulated oil.

20. The method of claim 14 wherein, for the at least one metal salt of an organic acid, the at least one metal salt of an inorganic acid, and the at least one metal salt of a phenol, the metal comprises an alkali metal, an alkaline earth metal, or mixtures thereof.

21. The method of claim 20 wherein, for the at least one metal salt of an organic acid, the at least one metal salt of an inorganic acid, and the at least one metal salt of a phenol, t

Assignees

• Schilowitz Alan M
• Baillargeon David J
• Haque Tabassumul
• Jacobs Peter W
• Yablon Dalia
• Ng Man Kit
• Carfolite Barbara A
• Gary Dana J
• Konicek Andrew
• Exxonmobil Res & Eng Co

Inventors

• Schilowitz Alan M
• Baillargeon David J
• Haque Tabassumul
• Jacobs Peter W
• Yablon Dalia
• Ng Man Kit
• Carfolite Barbara A
• Gary Dana J
• Konicek Andrew

Classifications

• C10M2207/125

  having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids · CPC title

• C10M2207/144

  containing hydroxy groups · CPC title

• C10M129/40

  monocarboxylic · CPC title

• C10M2207/16

  Naphthenic acids · CPC title

• C10M2219/046

  Overbased sulfonic acid salts · CPC title