LUBRICATING OIL COMPOSITION FOR INTERNAL COMBUSTION ENGINES

• US 20150203779A1
• Filed: 07/29/2013
• Published: 07/23/2015
• Est. Priority Date: 07/30/2012
• Status: Active Grant

• Current Assignee: Shell USA Incorporated (Shell Plc)
• Original Assignee: Shell Oil Company (Shell Plc)
• Inventors: Hanyuda, Kiyoshi, Murakami, Kouji, Kobayashi, Izumi, Kubo, Kouichi
• Granted Patent: US 10,100,265 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C10M 129/76 containing free hydroxy or carboxyl groups
• CPC Class Codes: C10M 169/04 Mixtures of base-materials and additives
• CPC Class Codes: C10M 2203/1006 used as base material
• CPC Class Codes: C10M 2203/1025 used as base material
• CPC Class Codes: C10M 2205/022 Ethene
• CPC Class Codes: C10M 2205/024 Propene
• CPC Class Codes: C10M 2205/173 used as base material
• CPC Class Codes: C10M 2207/289 containing free hydroxy groups
• CPC Class Codes: C10M 2209/084 Acrylate; Methacrylate
• CPC Class Codes: C10M 2229/041 containing aliphatic substituents
• CPC Class Codes: C10N 2020/02 Viscosity; Viscosity index
• CPC Class Codes: C10N 2020/065 Saturated Compounds
• CPC Class Codes: C10N 2030/02 Pour-point; Viscosity index
• CPC Class Codes: C10N 2030/06 Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• CPC Class Codes: C10N 2030/26 Waterproofing or water resistance
• CPC Class Codes: C10N 2030/78 Fuel contamination
• CPC Class Codes: C10N 2040/25 Internal-combustion engines
• CPC Class Codes: C10N 2040/253 Small diesel engines
• CPC Class Codes: C10N 2040/255 Gasoline engines
• CPC Class Codes: F02B 43/02 Engines characterised by means for increasing operating efficiency

Abstract

A lubricating oil composition for internal combustion engines containing a base oil mixture with specific properties and a monoglyceride with a specific structure. The lubricating oil composition of the present 5 invention, as well as providing outstanding wear resistance and fuel economy, causes condensed water etc. from water vapour produced as a result of fuel combustion to be dispersed in the oil, so preventing corrosion or rusting of the engine.

Claims

1. A lubricating oil composition for internal combustion engines comprising:

(A) a base oil mixture comprising at least two base oils in different API (American Petroleum Institute) categories, the base oil mixture having a sulphur content of from 0.14 to 0.7 mass %, % CA in accordance with ASTM D3238 of from 0.9 to 5.0, and % CP in accordance with ASTM D3238 of 60 or more, and

(B) a monoglyceride with a hydrocarbon group having from 8 to 22 carbon atoms (a glycerine fatty acid ester with the fatty acid ester bonded to one of the three hydroxyl groups of the glycerine), wherein the monoglyceride has a hydroxyl value of from 150 to 300 mgKOH/g and is present at a level of from 0.3 to 2.0 mass % based on the total mass of the composition.

2. The lubricating oil composition for internal combustion engines according to claim 1, wherein the base oil mixture (A) comprises a base oil classified as Group 1 by the API (American Petroleum Institute) with a kinematic viscosity at 100°

C. in the range of from 3 to 12 mm²/s, a viscosity index in the range of from 90 to 120, a sulphur content of from 0.03 to 0.7 mass %, % CA 5 or less according to ASTM D3238, and % CP of 60 or more according to ASTM D3238, and present at a level of from 25 to 50 mass % based on the total mass of the composition.

3. The lubricating oil composition for internal combustion engines according to claim 1, wherein the monoglyceride (B) is glycerine monooleate.

4. The lubricating oil composition for internal combustion engines according to claim 1, wherein the composition has a kinematic viscosity at 100°

C. in the range of from 5.6 to 15 mm²/s.

6. The lubricating oil composition for internal combustion engines according to claim 1 wherein the monoglyceride is present at a level of from 0.4 to 1.7 mass % based on the total mass of the composition.

7. The lubricating oil composition for internal combustion engines according to claim 1 wherein the monoglyceride is present at a level of from 0.5 to 1.5 mass % based on the total mass of the composition.

8. The lubricating oil composition for internal combustion engines according to claim 1 wherein the ratio of the monoglyceride mass % in the lubricating oil composition to the % CA in the base oil mixture is in the range of from 0.1 to 1.0.

9. The lubricating oil composition for internal combustion engines according to claim 1 wherein the ratio of the monoglyceride mass % in the lubricating oil composition to the % CA in the base oil mixture is in the range of from 0.3 to 1.0.

10. The lubricating oil composition for internal combustion engines according to claim 1 wherein the ratio of the monoglyceride mass % in the lubricating oil composition to the suplphur mass % in the base oil mixture is in the range of from 1.0 to 6.5.

11. The lubricating oil composition for internal combustion engines according to claim 1 wherein the ratio of the monoglyceride mass % in the lubricating oil composition to the suplphur mass % in the base oil mixture is in the range of from 3.5 to 6.0.

5. (canceled)

12. A method comprising lubricating an internal combustion engine with a lubricating oil composition that comprises:

(A) a base oil mixture comprising at least two base oils in different API (American Petroleum Institute) categories, the base oil mixture having a sulphur content of from 0.14 to 0.7 mass %, % CA in accordance with ASTM D3238 of from 0.9 to 5.0, and % CP in accordance with ASTM D3238 of 60 or more, and

(B) a monoglyceride with a hydrocarbon group having from 8 to 22 carbon atoms (a glycerine fatty acid ester with the fatty acid ester bonded to one of the three hydroxyl groups of the glycerine), wherein the monoglyceride has a hydroxyl value of from 150 to 300 mgKOH/g and is present at a level of from 0.3 to 2.0 mass % based on the total mass of the composition, and

wherein the internal combustion engine uses a fuel with H/C ratios of from 1.93 to 4, is fitted with idle-stop equipment, or uses a fuel incorporating a biofuel or a biodiesel.

13. The method according to claim 12 wherein the base oil mixture (A) comprises a base oil classified as Group 1 by the API (American Petroleum Institute) with a kinematic viscosity at 100°

C. in the range of from 3 to 12 mm²/s, a viscosity index in the range of from 90 to 120, a sulphur content of from 0.03 to 0.7 mass %, % CA 5 or less according to ASTM D3238, and % CP of 60 or more according to ASTM D3238, and present at a level of from 25 to 50 mass % based on the total mass of the composition.

14. The method according to claim 12 wherein the monoglyceride (B) is glycerine monooleate.

15. The method according to claim 12 wherein the composition has a kinematic viscosity at 100°

C. in the range from 5.6 to 15 mm²/s.

16. The method according to claim 12 wherein the monoglyceride is present at a level of from 0.4 to 1.7 mass % based on the total mass of the composition.

17. The method according to claim 12 wherein the monoglyceride is present at a level of from 0.5 to 1.5 mass % based on the total mass of the composition.

18. The method according to claim 12 wherein the ratio of the monoglyceride mass % in the lubricating oil composition to the % CA in the base oil mixture is in the range of from 0.1 to 1.0.

19. The method according to claim 12 wherein the ratio of the monoglyceride mass % in the lubricating oil composition to the % CA in the base oil mixture is in the range of from 0.3 to 1.0.

20. The method according to claim 12 wherein the ratio of the monoglyceride mass % in the lubricating oil composition to the suplphur mass % in the base oil mixture is in the range of from 1.0 to 6.5.

21. The method according to claim 12 wherein the ratio of the monoglyceride mass % in the lubricating oil composition to the suplphur mass % in the base oil mixture is in the range of from 3.5 to 6.0.