Lubricating oil composition

• US 20080248981A1
• Filed: 03/28/2008
• Published: 10/09/2008
• Est. Priority Date: 03/30/2007
• Status: Active Grant

• Current Assignee: JX Nippon Oil & Energy Corporation (ENEOS Holdings, Inc.)
• Original Assignee: Nippon Oil Corporation (ENEOS Holdings, Inc.)
• Inventors: Tagawa, Kazuo, Matsui, Shigeki
• Granted Patent: US 7,867,957 B2
• Time in Patent Office: Days
• US Class Current: 508/382
• CPC Class Codes: C10M 169/04 Mixtures of base-materials and additives
• CPC Class Codes: C10M 2203/1025 used as base material
• CPC Class Codes: C10M 2205/022 Ethene
• CPC Class Codes: C10M 2205/0225 used as base material
• 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 2205/173 used as base material
• CPC Class Codes: C10M 2207/262 derived from hydroxy substituted aromatic acids, e.g. salicylates
• CPC Class Codes: C10M 2207/2805 used as base material
• CPC Class Codes: C10M 2209/084 Acrylate; Methacrylate
• CPC Class Codes: C10M 2215/064 Di- and triaryl amines
• CPC Class Codes: C10M 2215/102 Ureas; Semicarbazides; Allophanates
• 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 2223/04 Phosphate esters
• CPC Class Codes: C10M 2227/09 Complexes with metals
• 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 2020/085 : Non-volatile compounds
• CPC Class Codes: C10N 2030/06 : Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• CPC Class Codes: C10N 2030/74 : Noack Volatility
• CPC Class Codes: C10N 2040/25 : Internal-combustion engines
• CPC Class Codes: C10N 2040/252 : Diesel engines
• CPC Class Codes: C10N 2040/255 : Gasoline engines

Abstract

The lubricating oil composition of the invention comprises a lubricating base oil with a urea adduct value of no greater than 4% by mass and a viscosity index of 100 or higher, an ashless friction modifier at 0.01-10% by mass and a phosphorus-containing anti-wear agent at 0.01-0.2% by mass as phosphorus, based on the total amount of the composition.

Claims

1. A lubricating oil composition comprising a lubricating base oil with a urea adduct value of no greater than 4% by mass and a viscosity index of 100 or higher, an ashless friction modifier at 0.01-10% by mass and a phosphorus-containing anti-wear agent at 0.01-0.2% by mass as phosphorus, based on the total amount of the composition.

2. A lubricating oil composition according to claim 1, wherein the lubricating base oil is produced by a production process that includes a step of hydrotreatment/hydroisomerization of a stock oil containing normal paraffins so as to obtain a treatment product having a urea adduct value of no greater than 4% by mass and a viscosity index of 100 or higher.

3. A lubricating oil composition according to claim 1, wherein the lubricating base oil has a kinematic viscosity at 100°

C. of 3.5 mm²/s or greater and a CCS viscosity at −

35°

C. of no greater than 2000 mPa·

s.

4. A lubricating oil composition according to claim 1, wherein the lubricating base oil has a NOACK evaporation of no greater than 15% by mass.

5. A lubricating oil composition according to claim 1, wherein the product of the kinematic viscosity at 40°

C. (units;

mm²/s) and the NOACK evaporation (units;

% by mass) of the lubricating base oil is no greater than 250.

6. A lubricating oil composition according to claim 1, wherein the ashless friction modifier is a compound containing at least 3 atoms of any one or more selected from among nitrogen, oxygen and sulfur.

7. A lubricating oil composition according to claim 1, which contains an organic molybdenum compound other than molybdenum dithiocarbamate or molybdenum dithiophosphate at 0.001-0.2% by mass as molybdenum based on the total amount of the composition.

8. A lubricating oil composition according to claim 1, which is used for a diesel engine or direct injection gasoline engine.