LUBRICANT COMPOSITION FOR GASOLINE ENGINE AND METHOD FOR PRODUCING SAME

• US 20170204348A1
• Filed: 03/24/2016
• Published: 07/20/2017
• Est. Priority Date: 03/24/2015
• Status: Active Grant

• Current Assignee: Idemitsu Kosan Company Limited
• Original Assignee: Idemitsu Kosan Company Limited
• Inventors: TAMURA, Kazushi
• Granted Patent: US 10,781,395 B2
• Time in Patent Office: Days
• CPC Class Codes: C10M 159/20 Reaction mixtures having an excess of neutralising base, e.g. so-called overbasic or highly basic products
• CPC Class Codes: C10M 165/00 Lubricating compositions characterised by the additive being a mixture of a macromolecular compound and a compound of unknown or incompletely defined constitution, each of these compounds being essential
• 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 2205/0285 used as base material
• 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 2209/084 Acrylate; Methacrylate
• CPC Class Codes: C10M 2215/064 Di- and triaryl amines
• CPC Class Codes: C10M 2215/28 Amides; Imides
• CPC Class Codes: C10M 2219/046 Overbasedsulfonic acid salts
• CPC Class Codes: C10M 2223/045 Metal containing thio derivatives
• CPC Class Codes: C10N 2010/02 Groups 1 or 11
• CPC Class Codes: C10N 2010/04 Groups 2 or 12
• CPC Class Codes: C10N 2020/02 Viscosity; Viscosity index
• 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 2030/18 : Anti-foaming property
• CPC Class Codes: C10N 2030/40 : Low content or no 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 2030/68 : Shear stability
• CPC Class Codes: C10N 2040/255 : Gasoline engines
• CPC Class Codes: C10N 2060/14 : by boron or a compound containing boron

Abstract

Provided is a lubricating oil composition having excellent detergency and LSPI preventing performance, and specifically a lubricating oil composition including a base oil, a calcium detergent, and a magnesium detergent and/or a sodium detergent, wherein the content of the calcium detergent as converted into a calcium atom and a mass ratio of a magnesium atom (Mg) contained in the magnesium detergent and/or a sodium atom (Na) contained in the sodium detergent to a calcium atom (Ca) [(Mg and/or Na)/Ca] fall within the specific ranges.

Claims

1. A lubricating oil composition, comprising a base oil, a calcium detergent, and a magnesium detergent and/or a sodium detergent, wherein

a content of the calcium detergent as converted into a calcium atom is less than 2,000 ppm by mass on a basis of the whole amount of the composition, and

a mass ratio of a magnesium atom (Mg) contained in the magnesium detergent and/or a sodium atom (Na) contained in the sodium detergent to a calcium atom (Ca) [(Mg and/or Na)/Ca] is 0.05 to 1.50.

2. The lubricating oil composition according to claim 1, further comprising a poly(meth)acrylate.

3. The lubricating oil composition according to claim 1, wherein the content of the calcium detergent as converted into a calcium atom is 800 to 1,800 ppm by mass on a basis of the whole amount of the composition.

4. The lubricating oil composition according to claim 1, wherein a content of the magnesium detergent and/or the sodium detergent as converted to a magnesium atom and/or a sodium atom is 100 ppm by mass or more on a basis of the whole amount of the composition.

5. The lubricating oil composition according to claim 1, wherein a content of the magnesium detergent and/or the sodium detergent as converted to a magnesium atom and/or a sodium atom is 100 to 1,500 ppm by mass on a basis of the whole amount of the composition.

6. The lubricating oil composition according to claim 1, further comprising a succinimide and/or a boron-containing succinimide.

7. The lubricating oil composition according to claim 6, wherein a content of nitrogen in the composition is less than 0.16 mass %.

8. The lubricating oil composition according to claim 6, wherein a content of the boron-containing succinimide as converted into a boron atom is 600 ppm by mass or less on a basis of whole amount of the composition.

9. The lubricating oil composition according to claim 1, wherein a total base number of at least one of the magnesium detergent and the sodium detergent by the perchloric acid method as prescribed in JIS K2501 is 150 to 650 mg/KOH.

10. The lubricating oil composition according to claim 1, wherein the content of the calcium detergent as converted into a calcium atom is 800 ppm by mass or more on a basis of the whole amount of the composition.

11. The lubricating oil composition according to claim 1, wherein the content of the calcium detergent as converted into a calcium atom is 800 to 1,500 ppm by mass or more on a basis of the whole amount of the composition.

12. The lubricating oil composition according to claim 1, wherein a content of the magnesium detergent and/or the sodium detergent as converted to a magnesium atom and/or a sodium atom is 300 to 1,000 ppm by mass on a basis of the whole amount of the composition.

13. The lubricating oil composition according to claim 1, wherein the base oil is at least one selected from the group consisting of a mineral oil and a synthetic oil which are classified into Groups 3 to 5 of the base stock categories of the API (American Petroleum Institute).

14. The lubricating oil composition according to claim 1, which has a kinematic viscosity at 100°

C. of 3.8 to 12.5 mm²/s.

15. The lubricating oil composition according to claim 1, which is suitable for a gasoline engine mounted with a direct injection supercharger.

16. A method for producing a lubricating oil composition, the method comprising:

blending a base oil with a calcium detergent and a magnesium detergent and/or a sodium detergent, such that

a content of the calcium detergent as converted into a calcium atom is less than 2,000 ppm by mass on a basis of the whole amount of the composition, and

a mass ratio of a magnesium atom (Mg) contained in the magnesium detergent and/or a sodium atom (Na) contained in the sodium detergent to a calcium atom (Ca) [(Mg and/or Na)/Ca] is 0.05 to 1.50.