Lubricating oil compositions

Patent metadata

Field	Value
Publication number	US-9963656-B2
Application number	US-201213445286-A
Country	US
Kind code	B2
Filing date	Apr 12, 2012
Priority date	Apr 12, 2012
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

An internal combustion engine crankcase lubricating oil composition having a sulphated ash content of no greater than 1.2 mass %, based on the mass of the lubricating oil composition, and a phosphorous content of no greater than 0.1 mass %, based on the mass of the lubricating oil composition, which lubricating oil composition comprises or is made by admixing:
(A) a crankcase base oil of lubricating viscosity, in a major amount; and (B) the following additives, in respective minor amounts: (B1) a polymeric friction modifier being the reaction product of
(a) a functionalized polyolefin, (b) a polyether, (c) a polyol, and (d) a monocarboxylic acid chain terminating group; and
(B2) at least one oil-soluble molybdenum compound.

First claim

What is claimed is:

1. An internal combustion engine crankcase lubricating oil composition having a sulphated ash content of no greater than 1.2 mass %, based on the mass of the lubricating oil composition, and a phosphorous content of no greater than 1200 ppm, based on the mass of the lubricating oil composition, which lubricating oil composition comprises or is made by admixing:
(A) a crankcase base oil of lubricating viscosity, in a major amount; and
(B) the following additives:
(B1) from about 0.2 to about 1.5 mass %, based on the total mass of the lubricating oil composition, of a polymeric friction modifier being the reaction product of
(a) polyisobutene functionalized with a diacid or anhydride functional group,
(b) a polymer of a water soluble alkylene glycol selected from the group consisting of polyethylene glycol, poly(ethylene-propylene) glycol, and poly (ethylene-butylene) glycol,
(c) a polyol, and
(d) a monocarboxylic acid chain terminating group

(B2) at least one oil-soluble molybdenum compound in an amount introducing from about 200 to about 500 ppm of molybdenum into the lubricating oil composition.

2. A composition as claimed in claim 1 , wherein the polyether is polyethylene glycol (PEG) selected from PEG 400 , PEG 600 , PEG 1000 or mixtures thereof.

3. A composition as claimed in claim 1 , wherein the polyisobutene is functionalised by reaction with maleic anhydride.

4. A composition as claimed in claim 1 , wherein the polyol is glycerol.

5. A composition as claimed in claim 1 , wherein the oil soluble molybdenum compounds is chosen from the group comprising molybdenum salts of dithiocarbamates, dithiophosphates, dithiophosphinates, xanthates, thioxanthates, sulfides, or a mixtures thereof.

6. A composition as claimed in claim 5 , wherein the oil soluble molybdenum compounds is chosen from the group comprising molybdenum salts of dithiocarbamates, dialkyldithiophosphates, alkyl xanthates, alkylthioxanthates and mixtures thereof.

7. A composition as claimed in claim 1 , wherein the oil soluble molybdenum compounds, is a mono-, di-, tri- or tetra-nuclear molybdenum compound.

8. A composition as claimed in claim 6 , wherein the oil soluble molybdenum compounds, is a dinuclear or trinuclear molybdenum compound.

9. A composition as claimed in claim 8 , wherein the oil soluble molybdenum compound is a trinuclear molybdenum compounds.

10. A method of improving fuel economy performance of a vehicle, which method comprises the step of lubricating the engine with a lubricating oil composition according to claim 1 .

Assignees

• Woodward Philip J
• Lin Wangkan
• Vela Erika M
• Strong Anthony J
• Infineum Int Ltd

Inventors

• Woodward Philip J
• Lin Wangkan
• Vela Erika M
• Strong Anthony J

Classifications

• C10M2205/026

  Butene · CPC title

• C10N2030/45

  Ash-less or low ash content · CPC title

• C10M2219/068

  Thiocarbamate metal salts · CPC title

• C10M2227/066

  derived from Mo or W · CPC title

• C10N2030/06

  Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure · CPC title