Lubricating oil compositions

• US 20060116299A1
• Filed: 11/29/2005
• Published: 06/01/2006
• Est. Priority Date: 11/30/2004
• Status: Active Grant

• Current Assignee: Infineum International Limited (Infineum)
• Original Assignee: Infineum International Limited (Infineum)
• Inventors: Irving, Matthew D., Arrowsmith, Stephen
• Granted Patent: US 7,906,469 B2
• Time in Patent Office: Days
• US Class Current: 508/443
• CPC Class Codes: C10M 163/00 Lubricating compositions characterised by the additive being a mixture of a compound of unknown or incompletely defined constitution and a non-macromolecular compound, each of these compounds being essential
• CPC Class Codes: C10M 167/00 Lubricating compositions characterised by the additive being a mixture of a macromolecular compound, a non-macromolecular compound and a compound of unknown or incompletely defined constitution, each of these compounds being essential
• CPC Class Codes: C10M 2203/1006 used as base material
• CPC Class Codes: C10M 2205/02 containing acyclic monomers
• CPC Class Codes: C10M 2205/04 containing aromatic monomers, e.g. styrene
• CPC Class Codes: C10M 2205/06 containing conjugated dienes
• CPC Class Codes: C10M 2207/026 with tertiary alkyl groups
• CPC Class Codes: C10M 2207/262 derived from hydroxy substituted aromatic acids, e.g. salicylates
• CPC Class Codes: C10M 2207/289 containing free hydroxy groups
• CPC Class Codes: C10M 2209/084 Acrylate; Methacrylate
• CPC Class Codes: C10M 2215/064 Di- and triaryl amines
• CPC Class Codes: C10M 2215/065 Phenyl-Naphthyl amines
• CPC Class Codes: C10M 2215/28 Amides; Imides
• CPC Class Codes: C10M 2217/00 Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
• CPC Class Codes: C10M 2217/02 Macromolecular compounds obtained from nitrogen containing monomers by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: C10M 2217/022 containing monomers having an unsaturated radical bound to an amino group
• CPC Class Codes: C10M 2217/024 containing monomers having an unsaturated radical bound to an amido or imido group
• CPC Class Codes: C10M 2217/028 containing monomers having an unsaturated radical bound to a nitrogen-containing hetero ring
• CPC Class Codes: C10M 2219/068 Thiocarbamate metal salts
• CPC Class Codes: C10M 2223/045 Metal containing thio derivatives
• CPC Class Codes: C10M 2223/065 : containing sulfur
• CPC Class Codes: C10N 2010/04 : Groups 2 or 12
• CPC Class Codes: C10N 2010/12 : Groups 6 or 16
• CPC Class Codes: C10N 2020/04 : Molecular weight; Molecular weight distribution
• CPC Class Codes: C10N 2020/085 : Non-volatile compounds
• CPC Class Codes: C10N 2030/02 : Pour-point; Viscosity index
• CPC Class Codes: C10N 2030/04 : Detergent property or dispersant property
• 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 2030/42 : Phosphor free or low phosphor content compositions
• CPC Class Codes: C10N 2030/43 : Sulfur free or low sulfur content compositions
• CPC Class Codes: C10N 2030/45 : Ash-less or low ash content
• CPC Class Codes: C10N 2030/52 : Base number [TBN]
• CPC Class Codes: C10N 2040/25 : Internal-combustion engines

Abstract

Lubricating oil compositions having a sulfated ash content of no more than 1.0 mass %, which contain a major amount of oil of lubricating viscosity, a minor amount of calcium salicylate detergent, an amount of a magnesium-based detergent providing the lubricating oil composition with at least 200 ppm of magnesium, an amount of a sulfur-containing molybdenum compound providing the lubricating oil composition with at least 20 ppm of molybdenum, and at least one nitrogen-containing dispersant providing the lubricating oil composition with at least 0.9 mass % nitrogen, which compositions provide improved top ring wear protection in internal combustion engines.

Claims

1. A lubricating oil composition having a maximum sulfated ash content of 1.0 mass %, said lubricating oil composition comprising:

(a) a major amount of oil of lubricating viscosity;

(b) a minor amount of calcium salicylate detergent;

(c) an amount of an overbased magnesium detergent providing the lubricating oil composition with at least 200 ppm of magnesium;

(d) an amount of an oil soluble sulfur-containing molybdenum compound providing the lubricating oil composition with at least 20 ppm of molybdenum; and

(e) at least one nitrogen-containing dispersant, the nitrogen-containing dispersant providing the lubricating oil composition with at least 0.09 mass % of nitrogen to the lubricating oil composition

2. A lubricating oil composition according to claim 1, wherein said calcium salicylate detergent is a combination of at least one overbased calcium salicylate detergent having a TBN of at least 100, and at least one calcium salicylate detergent having a TBN of less than 100.

3. A lubricating oil composition according to claim 1, wherein said minor amount of calcium salicylate detergent provides said lubricating oil composition with at least about 0.10 mass % of calcium, measured as sulfated ash content.

4. A lubricating oil composition according to claim 1, wherein said minor amount of calcium salicylate detergent provides said lubricating oil composition with less than about 0.20 mass % of calcium, measured as sulfated ash content.

5. A lubricating oil composition according to claim 1, wherein said amount of overbased magnesium detergent provides said lubricating oil composition with from 200 to 1250 ppm of magnesium.

6. A lubricating oil composition according to claim 1, wherein said sulfur-containing molybdenum compound is selected from the group consisting of oil soluble molybdenum dithiocarbamates, dithiophosphates, dithiophosphinates, xanthates, thioxanthates, sulfides, and mixtures thereof.

7. A lubricating oil composition according to claim 1, wherein said sulfur-containing molybdenum compound introduces into the lubricating oil composition from 20 to 500 ppm of molybdenum.

8. A lubricating oil composition according to claim 1, wherein the at least one nitrogen-containing dispersant is one or a plurality of nitrogen-containing dispersants present in an amount providing the lubricating oil composition with from 0.09 to 0.19 mass % of nitrogen in total.

9. A lubricating oil composition according to claim 1, having a phosphorus content of less than 800 ppm.

10. A lubricating oil composition according to claim 1, having a sulfur content of no greater than 0.3 mass %.

11. A method of operating a compression ignited engine provided with an exhaust gas recirculation system, which method comprises lubricating said engine with a lubricating oil composition according to claim 1.

12. A method according to claim 11, wherein said engine is a heavy duty diesel engine.