Lubricating oil composition

Patent metadata

Field	Value
Publication number	US-9580666-B2
Application number	US-201214362983-A
Country	US
Kind code	B2
Filing date	Dec 7, 2012
Priority date	Dec 7, 2011
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

A lubricating oil composition comprising (A) a lubricating oil base oil the kinematic viscosity of which at 100° C. is in the range of from 1.4 to 6 mm 2 /s, (B) from 250 to 2000 ppm in terms of molybdenum of a molybdenum dialkyldithiocarbamate, (C) from 20 to 500 ppm in terms of sulphur of tetrabenzyl thiuram disulphide and (D) from 0.05 to 3.0 mass % of an amine. The lubricating oil composition of the present invention has a superior friction reducing effect and which has a superior fuel economy effect.

First claim

That which is claimed is:

1. A lubricating oil composition comprising:
(a) a lubricating oil base oil the kinematic viscosity of which at 100° C. is in the range of from 1.4 to 6 mm 2 /s,
(b) from 250 to 2000 ppm in terms of molybdenum of a molybdenum dialkyldithiocarbamate as expressed by the undermentioned Formula (1),

wherein in Formula (1), R 1 to R 4 denote alkyl groups, and X 1 to X 4 denote oxygen atoms or sulphur atoms,
(c) 20 to 500 ppm in terms of sulphur of tetrabenzyl thiuram disulphide as expressed by the undermentioned Formula (2)

and (d) 0.05 to 3.0 mass % of an amine as expressed by the undermentioned Formula (3) Formula (4), or a mixture thereof,

wherein in Formula (3), R 5 to R 7 denote, each independently, hydrogen or an “alkyl group, aryl group or alkylaryl group” having from 1 to 23 carbon atoms, and

wherein in Formula (4), R 8 and R 9 denote, each independently, hydrogen or an “alkyl group, aryl group or alkylaryl group” having from 1 to 23 carbon atoms.

2. The lubricating oil composition according to claim 1 wherein the lubricating oil base oil (A) comprises at least one selected from the group consisting of:
(A1) mixed mineral oil base oils the kinematic viscosity of which at 100° C. is in the range of from 1.4 to 6 mm 2 /s,
(A2) polyalphaolefins, alphaolefin oligomers or mixtures thereof the kinematic viscosity of which at 100° C. is in the range of from 2 to 8 mm 2 /s,
(A3) hindered esters, diesters or mixtures thereof the kinematic viscosity of which at 100° C. is in the range of from 1.4 to 12 mm 2 /s and
(A4) lubricating oil base oils the kinematic viscosity of which at 100° C. is in the range of from 7 to 50 mm 2 /s.

3. The lubricating oil composition according to claim 1 further comprising at least one additive selected from the group consisting of metallic detergents, ashless dispersants, zinc dialkyldithiophosphates, rust preventatives, metal deactivators, viscosity index improvers, pour point depressants and defoamers.

4. The lubricating oil composition according to claim 2 wherein the lubricating base oil comprises (A1), and wherein (A1) is selected from the group consisting of a Group II base oil, a Group III base oil, and a mixture thereof.

5. The lubricating oil composition according to claim 2 wherein the lubricating base oil comprises (A4), and wherein (A4) is selected from the group consisting of a Group I base oil, a Group II base oil, a Group III base oil, a Group IV base oil, and a mixture thereof.

6. The lubricating oil composition according to claim 1 wherein the molybdenum dialkyldithiocarbamate is present in an amount from 300 to 1800 ppm in terms of molybdenum.

7. The lubricating oil composition according to claim 1 wherein the tetrabenzyl thiuram disulphide is present in an amount from 50 to 350 ppm in terms of sulphur.

8. The lubricating oil composition according to claim 1 wherein the amine is present in an amount from 0.05 to 2.0 mass %.

9. A method comprising:
applying a lubricating oil composition to a surface in relative movement to another surface, wherein the lubricating oil composition comprises:

(a) a lubricating oil base oil the kinematic viscosity of which at 100° C. is in the range of from 1.4 to 6 mm 2 /s,
(b) from 250 to 2000 ppm in terms of molybdenum of a molybdenum dialkyldithiocarbamate as expressed by the undermentioned Formula (1),

wherein in Formula (1), R 1 to R 4 denote alkyl groups, and X 1 to X 4 denote oxygen atoms or sulphur atoms,
(c) 20 to 500 ppm in terms of sulphur of tetrabenzyl thiuram disulphide as expressed by the undermentioned Formula (2)

and (d) 0.05 to 3.0 mass % of an amine as expressed by the undermentioned Formula (3) Formula (4), or a mixture thereof,

wherein in Formula (3), R 5 to R 7 denote, each independently, hydrogen or an “alkyl group, aryl group or alkylaryl group” having from 1 to 23 carbon atoms, and

wherein in Formula (4), R 8 and R 9 denote, each independently, hydrogen or an “alkyl group, aryl group or alkylaryl group” having from 1 to 23 carbon atoms.

10. The method of claim 9 wherein the surface is in an internal combustion engine.

11. The method of claim 9 wherein the lubricating oil base oil (A) comprises at least one selected from the group consisting of:
(A1) mixed mineral oil base oils the kinematic viscosity of which at 100° C. is in the range of from 1.4 to 6 mm 2 /s,
(A2) polyalphaolefins, alphaolefin oligomers or mixtures thereof the kinematic viscosity of which at 100° C. is in the range of from 2 to 8 mm 2 /s,
(A3) hindered esters, diesters or mixtures thereof the kinematic viscosity of which at 100° C. is in the range of from 1.4 to 12 mm 2 /s and
(A4) lubricating oil base oils the kinematic viscosity of which at 100° C. is in the range of from 7 to 50 mm 2 /s.

12. The method of claim 9 wherein the lubricating oil composition further comprises at least one additive selected from the group consisting of metallic detergents, ashless dispersants, zinc dialkyldithiophosphates, rust preventatives, metal deactivators, viscosity index improvers, pour point depressants and defoamers.

13. The method of claim 11 wherein the lubricating oil base oil comprises (A1), and wherein (A1) is selected from the group consisting of a Group II base oil, a Group III base oil, and a mixture thereof.

14. The method of claim 11 wherein the lubricating oil base oil comprises (A4), and wherein (A4) is selected from the group consisting of a Group I base oil, a Group II base oil, a Group III base oil, a Group IV base oil, and a mixture thereof.

15. The method of claim 9 wherein the molybdenum dialkyldithiocarbamate is present in an amount from 300 to 1800 ppm in terms of molybdenum.

16. The method of claim 9 wherein the tetrabenzyl thiuram disulphide is present in an amount from 50 to 350 ppm in terms of sulphur.

17. The method of claim 9 wherein the amine is present in an amount from 0.05 to 2.0 mass %.

Assignees

• Shell Oil Co

Inventors

• Kubo Kouichi
• Hanyuda Kiyoshi

Classifications

• C10N2020/02

  Viscosity; Viscosity index · CPC title

• C10M2205/022

  Ethene · CPC title

• C10N2040/25

  Internal-combustion engines · CPC title

• C10M2219/066

  Thiocarbamic type compounds · CPC title

• C10M2219/068

  Thiocarbamate metal salts · CPC title