METHOD FOR IMPROVING ENGINE FUEL EFFICIENCY

• US 20150175924A1
• Filed: 03/19/2014
• Published: 06/25/2015
• Est. Priority Date: 12/23/2013
• Status: Abandoned Application

• Current Assignee: ExxonMobil Research & Engineering Company (Exxon Mobil Corporation)
• Original Assignee: ExxonMobil Research & Engineering Company (Exxon Mobil Corporation)
• Inventors: Dance, Smruti A., Gaal, Dennis A., Patel, Mrugesh Nilesh
• Application Number:
  US14/219,328
• Publication Number:
  US 20150175924A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C10M 135/18 thiocarbamic type, e.g. containing the groups
• CPC Class Codes: C10M 137/10 Thio derivatives
• CPC Class Codes: C10M 159/18 Complexes with metals
• CPC Class Codes: C10M 2203/1006 used as base material
• CPC Class Codes: C10M 2203/1025 used as base material
• CPC Class Codes: C10M 2205/02 containing acyclic monomers
• CPC Class Codes: C10M 2205/028 containing aliphatic monomers having more than four carbon atoms
• CPC Class Codes: C10M 2205/0285 used as base material
• CPC Class Codes: C10M 2207/021 having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms
• CPC Class Codes: C10M 2207/027 Neutral salts thereof
• CPC Class Codes: C10M 2207/04 Ethers; Acetals; Ortho-esters; Ortho-carbonates
• CPC Class Codes: C10M 2207/126 monocarboxylic
• CPC Class Codes: C10M 2207/144 containing hydroxy groups
• CPC Class Codes: C10M 2207/262 derived from hydroxy substituted aromatic acids, e.g. salicylates
• CPC Class Codes: C10M 2207/283 of polyhydroxy compounds
• CPC Class Codes: C10M 2207/289 containing free hydroxy groups
• CPC Class Codes: C10M 2209/062 Vinyl esters of saturated carboxylic or carbonic acids, e.g. vinyl acetate
• CPC Class Codes: C10M 2209/084 Acrylate; Methacrylate
• CPC Class Codes: C10M 2209/086 polycarboxylic, e.g. maleic acid
• CPC Class Codes: C10M 2209/103 Polyethers, i.e. containing di- or higher polyoxyalkylene groups
• CPC Class Codes: C10M 2209/104 : of alkylene oxides containing two carbon atoms only
• CPC Class Codes: C10M 2209/109 : esterified
• CPC Class Codes: C10M 2215/064 : Di- and triaryl amines
• CPC Class Codes: C10M 2215/082 : containing hydroxyl groups; Alkoxylated derivatives
• CPC Class Codes: C10M 2215/28 : Amides; Imides
• CPC Class Codes: C10M 2219/044 : Sulfonic acids, Derivatives thereof, e.g. neutral salts
• CPC Class Codes: C10M 2219/046 : Overbasedsulfonic acid salts
• CPC Class Codes: C10M 2219/068 : Thiocarbamate metal salts
• CPC Class Codes: C10M 2223/045 : Metal containing thio derivatives
• CPC Class Codes: C10M 2229/02 : Unspecified siloxanes; Silicones
• CPC Class Codes: C10N 2010/04 : Groups 2 or 12
• CPC Class Codes: C10N 2010/12 : Groups 6 or 16
• CPC Class Codes: C10N 2020/02 : Viscosity; Viscosity index
• CPC Class Codes: C10N 2030/06 : Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• CPC Class Codes: C10N 2030/08 : Resistance to extreme temperature
• CPC Class Codes: C10N 2030/10 : Inhibition of oxidation, e.g. anti-oxidants
• CPC Class Codes: C10N 2030/54 : Fuel economy
• CPC Class Codes: C10N 2040/25 : Internal-combustion engines
• CPC Class Codes: C10N 2060/14 : by boron or a compound containing boron

Abstract

A method for improving fuel efficiency and friction reduction properties, while maintaining or improving deposit control, in an engine 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 a tungsten organic complex as a minor component. Fuel efficiency and friction reduction properties are improved and deposit control is maintained or improved as compared to friction reduction properties and deposit control achieved using a lubricating engine oil containing a minor component other than the tungsten organic complex. A lubricating engine oil having a composition comprising a lubricating oil base stock as a major component, and a tungsten organic complex as a minor component. The lubricating engine oils are useful in internal combustion engines including direct injection, gasoline and diesel engines.

Claims

1. A method for improving fuel efficiency and friction reduction properties, while maintaining or improving deposit control, in an engine 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 metal-containing organic complex friction modifier, as a minor component;

wherein the metal-containing organic complex friction modifier comprises a tungsten organic complex that provides between 20 parts per million (ppm) and 500 ppm of tungsten to the formulated oil; and

wherein fuel efficiency and friction reduction properties are improved and deposit control is maintained or improved as compared to friction reduction properties and deposit control achieved using a lubricating engine oil containing a minor component other than the tungsten organic complex.

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 tungsten organic complex is selected from the group consisting of:

a tungsten dithiophosphate represented by the formula

4. The method of claim 1 wherein the formulated oil further comprises at least one organic friction modifier, wherein said organic friction modifier is selected from the group consisting of an alkoxylated fatty acid ester, alkanolamide, glycerol fatty acid ester, borated glycerol fatty acid ester, and fatty alcohol ether.

5. The method of claim 4 wherein the formulated oil further comprises an organic friction modifier mixture comprising a first organic friction modifier, and at least one other organic friction modifier different from said first organic friction modifier;

wherein said first organic friction modifier and said at least one other organic friction modifier are selected from the group consisting of an alkoxylated fatty acid ester, alkanolamide, glycerol fatty acid ester, borated glycerol fatty acid ester, and fatty alcohol ether.

6. The method of claim 4 wherein the alkoxylated fatty acid ester is selected from polyoxyethylene stearate and fatty acid polyglycol ester;

the alkanolamide is selected from lauric acid diethylalkanolamide and palmic acid diethylalkanolamide;

the glycerol fatty acid ester is selected from glycerol mono-oleate and glycerol mono-stearate;

the borated glycerol fatty acid ester is selected from borated glycerol mono-oleate and borated glycerol mono-sterate; and

the fatty alcohol ether is selected from stearyl ether and myristyl ether.

7. The method of claim 4 wherein the at least one organic friction modifier comprises an ethoxylated fatty acid ester, a stearyl ether, or a mixture thereof.

8. The method of claim 1 wherein the oil base stock is present in an amount of from 70 weight percent to 95 weight percent, and the tungsten organic complex is present in an amount of from 0.01 weight percent to 2.5 weight percent, based on the total weight of the formulated oil.

9. The method of claim 1 wherein, in friction measurements of the lubricating oil by mini-traction machine (MTM) in Stribeck mode at 140°

C., the integrated Stribeck friction coefficient of the lubricating oil in the MTM is reduced as compared to the integrated Stribeck friction coefficient of a lubricating oil containing a minor component other than the tungsten organic complex; and

wherein, in deposit measurements of the lubricating oil by thermo-oxidation engine oil simulation TEOST 33C, the amount of total deposits is reduced or maintained as compared to the amount of total deposits in a lubricating oil containing a minor component other than the tungsten organic complex.

10. A lubricating engine oil having a composition comprising a lubricating oil base stock as a major component;

and a metal-containing organic complex friction modifier, as a minor component;

wherein the metal-containing organic complex friction modifier comprises a tungsten organic complex that provides between 20 parts per million (ppm) and 500 ppm of tungsten to the formulated oil; and

wherein fuel efficiency and friction reduction properties are improved and deposit control is maintained or improved as compared to friction reduction properties and deposit control achieved using a lubricating engine oil containing a minor component other than the tungsten organic complex.

11. The lubricating engine oil of claim 10 wherein the lubricating oil base stock comprises a Group I, Group II, Group III, Group IV or Group V base oil.

12. The lubricating engine oil of claim 10 wherein the tungsten organic complex is selected from the group consisting of:

a tungsten dithiophosphate represented by the formula

13. The lubricating engine oil of claim 10 further comprising at least one organic friction modifier, wherein said organic friction modifier is selected from the group consisting of an alkoxylated fatty acid ester, alkanolamide, glycerol fatty acid ester, borated glycerol fatty acid ester, and fatty alcohol ether.

14. The lubricating engine oil of claim 13 further comprising an organic friction modifier mixture comprising a first organic friction modifier, and at least one other organic friction modifier different from said first organic friction modifier;

wherein said first organic friction modifier and said at least one other organic friction modifier are selected from the group consisting of an alkoxylated fatty acid ester, alkanolamide, glycerol fatty acid ester, borated glycerol fatty acid ester, and fatty alcohol ether.

15. The lubricating engine oil of claim 13 wherein the alkoxylated fatty acid ester is selected from polyoxyethylene stearate and fatty acid polyglycol ester;

the alkanolamide is selected from lauric acid diethylalkanolamide and palmic acid diethylalkanolamide;

the glycerol fatty acid ester is selected from glycerol mono-oleate and glycerol mono-stearate;

the borated glycerol fatty acid ester is selected from borated glycerol mono-oleate and borated glycerol mono-sterate; and

the fatty alcohol ether is selected from stearyl ether and myristyl ether.

16. The lubricating engine oil of claim 13 wherein the at least one organic friction modifier comprises an ethoxylated fatty acid ester, a stearyl ether, or a mixture thereof.

17. The lubricating engine oil of claim 10 wherein the oil base stock is present in an amount of from 70 weight percent to 95 weight percent, and the tungsten organic complex is present in an amount of from 0.01 weight percent to 2.5 weight percent, based on the total weight of the formulated oil.

18. The lubricating engine oil of claim 10 wherein, in friction measurements of the lubricating oil by mini-traction machine (MTM) in Stribeck mode at 140°

C., the integrated Stribeck friction coefficient of the lubricating oil in the MTM is reduced as compared to the integrated Stribeck friction coefficient of a lubricating oil containing a minor component other than the tungsten organic complex; and

wherein, in deposit measurements of the lubricating oil by thermo-oxidation engine oil simulation (TEOST 33C) measured by ASTM D6335, the amount of total deposits is reduced or maintained as compared to the amount of total deposits in a lubricating oil containing a minor component other than the tungsten organic complex.

19. The lubricating engine oil of claim 10 further comprising one or more of an anti-wear additive, viscosity index improver, antioxidant, detergent, dispersant, pour point depressant, corrosion inhibitor, metal deactivator, seal compatibility additive, anti-foam agent, inhibitor, and anti-rust additive.

20. The lubricating engine oil of claim 10 wherein the lubricating oil is a passenger vehicle engine oil (PVEO).