LUBRICATING OIL COMPOSITION AND METHOD FOR MANUFACTURING SAID LUBRICATING OIL COMPOSITION

• US 20170298287A1
• Filed: 09/18/2015
• Published: 10/19/2017
• Est. Priority Date: 09/19/2014
• Status: Active Grant

• Current Assignee: Idemitsu Kosan Company Limited
• Original Assignee: Idemitsu Kosan Company Limited
• Inventors: TAMURA, Kazushi
• Granted Patent: US 10,584,302 B2
• Time in Patent Office: Days
• CPC Class Codes: C10M 107/02 Hydrocarbon polymers; Hydrocarbon polymers modified by oxidation
• CPC Class Codes: C10M 125/26 Compounds containing silicon or boron, e.g. silica, sand
• CPC Class Codes: C10M 133/44 Five-membered ring containing nitrogen and carbon only
• CPC Class Codes: C10M 139/00 Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing atoms of elements not provided for in groups C10M127/00 - C10M137/00
• CPC Class Codes: C10M 161/00 Lubricating compositions characterised by the additive being a mixture of a macromolecular compound and a non-macromolecular compound, each of these compounds being essential
• 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 169/044 the additives being a mixture of non-macromolecular and macromolecular compounds
• CPC Class Codes: C10M 2201/087 Boron oxides, acids or salts
• CPC Class Codes: C10M 2203/1025 used as base material
• CPC Class Codes: C10M 2205/0285 used as base material
• CPC Class Codes: C10M 2207/028 Overbased salts thereof
• 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 2215/28 Amides; Imides
• CPC Class Codes: C10M 2215/30 Heterocyclic compounds
• 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 2227/06 Organic compounds derived from inorganic acids or metal salts
• 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 2020/04 : Molecular weight; Molecular weight distribution
• CPC Class Codes: C10N 2020/073 : Star shaped polymers
• CPC Class Codes: C10N 2030/04 : Detergent property or dispersant property
• CPC Class Codes: C10N 2030/54 : Fuel economy
• CPC Class Codes: C10N 2030/68 : Shear stability
• CPC Class Codes: C10N 2040/255 : Gasoline engines
• CPC Class Codes: C10N 2040/26 : Two-strokes or two-cycle engines
• CPC Class Codes: C10N 2060/14 : by boron or a compound containing boron

Abstract

The lubricating oil composition of the present invention contains, together with a base oil, a viscosity index improver (A) including a comb-shaped polymer (A1), a detergent dispersant (B) including an alkali metal borate (B1) and an organometallic compound (B2) containing a metal atom selected from an alkali metal atom and an alkaline earth metal atom, and a friction modifier (C) including a molybdenum-containing friction modifier, with the total content of an alkali metal atom and an alkaline earth metal atom being 2,000 mass ppm or less. The lubricating oil composition of the present invention has excellent detergency, fuel saving properties, and LSPI-preventing properties.

Claims

1. A lubricating oil composition comprising, together with a base oil,

a viscosity index improver (A) comprising a comb-shaped polymer (A1),

a detergent dispersant (B) comprising an alkali metal borate (B1) and an organometallic compound (B2) comprising a metal atom selected from the group consisting of an alkali metal atom and an alkaline earth metal atom, and

a friction modifier (C) comprising a molybdenum-containing friction modifier,

wherein a total content of an alkali metal atom and an alkaline earth metal atom is 2,000 mass ppm or less.

2. The lubricating oil composition according to claim 1, wherein a weight average molecular weight (Mw) of the comb-shaped polymer (A1) is 1,000 to 1,000,000.

3. The lubricating oil composition according to claim 1, wherein a content of the comb-shaped polymer (A1) is 0.10 to 20 mass % on a basis of a total amount of the lubricating oil composition.

4. The lubricating oil composition according to claim 1, wherein a ratio of a content of the comb-shaped polymer (A1) and a content of the alkali metal borate (B1) in terms of a boron atom, [(A1)/(B1)], is in a range of 12/1 to 100/1.

5. The lubricating oil composition according to claim 1, wherein the detergent dispersant (B) further comprises at least one alkenylsuccinimide compound (B3) selected from the group consisting of an alkenylsuccinimide and a boronated alkenyl succinimide.

6. The lubricating oil composition according to claim 1, wherein the alkali metal atom comprised in the alkali metal borate (B1) is a potassium atom.

7. The lubricating oil composition according to claim 1, wherein the metal atom comprised in the organometallic compound (B2) is a sodium atom, a calcium atom, a magnesium atom, or a barium atom.

8. The lubricating oil composition according to claim 1, wherein the organometallic compound (B2) is at least one selected from the group consisting of a metal salicylate, a metal phenate, and a metal sulfonate.

9. The lubricating oil composition according to claim 1, wherein a content of the molybdenum-containing friction modifier in terms of a molybdenum atom is 0.01 to 0.15 mass % on a basis of a total amount of the lubricating oil composition.

10. The lubricating oil composition according to claim 1, wherein a total content of a sodium atom, a calcium atom, a magnesium atom, and a barium atom is 1,900 mass ppm or less on a basis of a total amount of the lubricating oil composition.

11. The lubricating oil composition according to claim 1, wherein a content of a calcium atom is 1,900 mass ppm or less on a basis of a total amount of the lubricating oil composition.

12. The lubricating oil composition according to claim 1, wherein a ratio of (i) a content of the organometallic compound (B2) in terms of the metal atom selected from the group consisting of the alkali metal atom and the alkaline earth metal atom and (ii) a content of the alkali metal borate (B1) in terms of a boron atom, [(B2)/(B1)], is in a range of 1/1 to 15/1.

13. The lubricating oil composition according to claim 1, wherein a content of a potassium atom is 0.01 to 0.10 mass % on a basis of a total amount of the lubricating oil composition.

14. The lubricating oil composition according to claim 1, wherein a content of a polymethacrylate compound not corresponding to the comb-shaped polymer (A1) is 0 to 30 parts by mass relative to 100 parts by mass of the comb-shaped polymer (A1) comprised in the lubricating oil composition.

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

16. The lubricating oil composition according to claim 1, which is suitable for use in direct-injection supercharged gasoline engines.

18. A method comprising operating a direct-injection supercharged gasoline engine containing the lubricating oil composition according to claim 1.

17. A lubricating oil composition comprising, together with a base oil,

a viscosity index improver (A) comprising a comb-shaped polymer (A1),

a detergent dispersant (B) comprising an alkali metal borate (B1) and an organometallic compound (B2) comprising a metal atom selected from the group consisting of an alkali metal atom and an alkaline earth metal atom, and

a friction modifier (C) comprising a molybdenum-containing friction modifier,

wherein a content of a calcium atom is 1,900 mass ppm or less.

19. A method for producing a lubricating oil composition, comprising blending a base oil with

a viscosity index improver (A) comprising a comb-shaped polymer (A1),

a detergent dispersant (B) comprising an alkali metal borate (B1) and an organometallic compound (B2) comprising a metal atom selected from the group consisting of an alkali metal atom and an alkaline earth metal atom, and

a friction modifier (C) comprising a molybdenum-containing friction modifier,

thereby preparing a lubricating oil composition such that a total content of an alkali metal atom and an alkaline earth metal atom is 2,000 mass ppm or less, or a content of a calcium atom is 1,900 mass ppm or less.