Two-phase lubricating oil composition

Patent metadata

Field	Value
Publication number	US-9550956-B2
Application number	US-201214233779-A
Country	US
Kind code	B2
Filing date	Jul 10, 2012
Priority date	Jul 21, 2011
Publication date	Jan 24, 2017
Grant date	Jan 24, 2017

Abstract

Lubricating oil compositions are provided herein that comprise a mixture of: (A) a hydrocarbon as a low-viscosity constituent, (B) a polyalkylene glycol (PAG) as a high-viscosity constituent wherein the oxygen/carbon weight ratio is in the range of from 0.450 to 0.580, and (C) a compound as a control constituent wherein the oxygen/carbon weight ratio is in the range of from 0.080 to 0.350. Methods of lubricating a surface using such lubricating compositions are also provided herein.

First claim

That which is claimed is:

1. A lubricating oil composition comprising a mixture of:
(A) a hydrocarbon as a low-viscosity constituent,
(B) a polyalkylene glycol (PAG) as a high-viscosity constituent wherein the oxygen/carbon weight ratio is in the range of from 0.450 to 0.580 and the density at 20° C. is in the range of from 1.000 to 1.050 g/cm 3 , and
(C) a compound as a control constituent wherein the compound comprises one or more ester groups and has an oxygen/carbon weight ratio in the range of from 0.080 to 0.350.

2. A lubricating oil composition in accordance with claim 1 wherein the low-viscosity constituent is selected from a poly α-olefin, a mineral oil, a GTL base oil, and mixtures thereof.

3. A lubricating oil composition in accordance with claim 1 wherein the control constituent is an aliphatic ester compound and the carbon chain other than in the ester group is C4 to C18.

4. A lubricating oil composition in accordance with claim 1 wherein the density of the low-viscosity constituent at 20° C. is in the range of from 0.750 to 0.950 g/cm 3 .

5. A lubricating oil composition in accordance with claim 1 wherein the density of the control constituent at 20° C. is in the range of from 0.800 to 1.000 g/cm 3 .

6. A lubricating oil composition in accordance with claim 1 wherein the kinematic viscosity at 40° C. of the low-viscosity constituent is in the range of from 5 to 500 mm 2 /s.

7. A lubricating oil composition in accordance with claim 1 wherein the kinematic viscosity at 100° C. of the high-viscosity constituent is in the range of from 2.5 to 100 mm 2 /s.

8. A lubricating oil composition in accordance with claim 1 wherein the kinematic viscosity at 100° C. is in the range of from 1.5 to 100 mm 2 /s.

9. A lubricating oil composition in accordance with claim 1 wherein, relative to 100% by weight of the total composition, the blended proportion of the low-viscosity constituent is in the range of from 30 to 80% by weight, the blended proportion of the high-viscosity constituent is in the range of from 3 to 35% by weight, and the blended proportion of the control constituent is in the range of from 1 to 30% by weight.

10. A method comprising: applying a lubricating oil composition to a surface in relative movement to another surface, wherein the lubricating oil composition comprises a mixture of:
(A) a hydrocarbon as a low-viscosity constituent,
(B) a polyalkylene glycol (PAG) as a high-viscosity constituent wherein the oxygen/carbon weight ratio is in the range of from 0.450 to 0.580 and the density at 20° C. is in the range of from 1.000 to 1.050 g/cm 3 , and
(C) a compound as a control constituent wherein the compound comprises one or more ester groups and has an oxygen/carbon weight ratio in the range of from 0.080 to 0.350.

11. A method in accordance with claim 10 wherein the surface is a surface of a rotating member or a sliding member in a vehicle or industrial machine.

12. A method in accordance with claim 10 wherein the surface is in an engine, a gear mechanism, a speed-change gearbox, a bearing, a hydraulic apparatus or compression machinery.

13. A method in accordance with claim 10 wherein the low-viscosity constituent is selected from a poly α-olefin, a mineral oil, a GTL base oil, and mixtures thereof.

14. A method in accordance with claim 10 wherein the control constituent is an aliphatic ester compound and the carbon chain other than in the ester group is C4 to C18.

15. A method in accordance with claim 10 wherein the density of the low-viscosity constituent at 20° C. is in the range of from 0.750 to 0.950 g/cm 3 .

16. A method in accordance with claim 10 wherein the density of the control constituent at 20° C. is in the range of from 0.800 to 1.000 g/cm 3 .

17. A method in accordance with claim 10 wherein the kinematic viscosity at 40° C. of the low-viscosity constituent is in the range of from 5 to 500 mm 2 /s.

18. A method in accordance with claim 10 wherein the kinematic viscosity at 100° C. of the high-viscosity constituent is in the range of from 2.5 to 100 mm 2 /s.

19. A method in accordance with claim 10 wherein the kinematic viscosity at 100° C. is in the range of from 1.5 to 100 mm 2 /s.

20. A method in accordance with claim 10 wherein, relative to 100% by weight of the total composition, the blended proportion of the low-viscosity constituent is in the range of from 30 to 80% by weight, the blended proportion of the high-viscosity constituent is in the range of from 3 to 35% by weight, and the blended proportion of the control constituent is in the range of from 1 to 30% by weight.

Assignees

• Kamata Kumiko
• Maruyama Ryuji
• Shinoda Noriaki
• Tazaki Hiroyuki
• Shell Oil Co

Inventors

• Kamata Kumiko
• Maruyama Ryuji
• Shinoda Noriaki
• Tazaki Hiroyuki

Classifications

• C10M2209/1075

  used as base material · CPC title

• C10N2030/56

  Boundary lubrication or thin film lubrication · CPC title

• C10M2207/285

  of aromatic polycarboxylic acids · CPC title

• C10M2207/283

  of polyhydroxy compounds · CPC title

• C10N2040/25

  Internal-combustion engines · CPC title