Lubricating oil composition

Patent metadata

Field	Value
Publication number	US-9534188-B2
Application number	US-201314391319-A
Country	US
Kind code	B2
Filing date	Apr 3, 2013
Priority date	Apr 12, 2012
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

A lubricating oil composition comprising (A) an ethylene/α-olefin copolymer satisfying all of the following requirements (A-1) to (A-3): (A-1) an ethylene structural unit content of 30 to 70% by mol, (A-2) a kinematic viscosity at 100° C. of 20 to 3000 mm 2 /s, and (A-3) Mw/Mn as measured by GPC of 1 to 2.5, (F) a sulfur-containing compound in which at least one hydrocarbon group adjacent to sulfur is a secondary or tertiary hydrocarbon group, and as an optional component, (G) an α-olefin polymer having 3 to 6 carbon atoms, and having a kinematic viscosity at 40° C. of 450 to 51,000 mm 2 /s, a sulfur content of 0.1 to 5 parts by weight, and a component (G) content of 0 to 15 parts by weight. The lubricating oil composition is suitable particularly for gear oil and the like.

First claim

The invention claimed is:

1. A lubricating oil composition comprising
(A) an ethylene/α-olefin copolymer satisfying all of the following requirements (A-1) to (A-3):
(A-1) an ethylene structural unit content is 30 to 70% by mol,
(A-2) a kinematic viscosity at 100° C. is 20 to 3000 mm 2 /s, and
(A-3) Mw/Mn as measured by GPC is 1 to 2.5,

(F) a sulfur-containing compound in which at least one hydrocarbon group adjacent to sulfur is a secondary or tertiary hydrocarbon group, and
as an optional component, (G) an α-olefin polymer having 3 to 6 carbon atoms, and having
a kinematic viscosity at 40° C. of 450 to 51,000 mm 2 /s,
a sulfur content of 0.1 to 5 parts by weight, and
a component (G) content of 0 to 15 parts by weight,
with the proviso that the total amount of the lubricating oil composition is 100 parts by weight.

2. The lubricating oil composition as claimed in claim 1 , which further comprises a component (B) satisfying all of the following requirements (B-1) to (B-3):
(B-1) a kinematic viscosity at 100° C. is 3 to 120 mm 2 /s,
(B-2) a viscosity index is not less than 90, and
(B-3) a pour point is not higher than −10° C.

3. The lubricating oil composition as claimed in claim 2 , wherein the component (B) is synthetic oil (C) satisfying all of the following requirements (C-1) to (C-3):
(C-1) a kinematic viscosity at 100° C. is 20 to 120 mm 2 /s,
(C-2) a viscosity index is not less than 120, and
(C-3) a pour point is not higher than −30° C.

4. The lubricating oil composition as claimed in claim 2 , wherein the component (B) is synthetic oil (D) satisfying all of the following requirements (D-1) to (D-3):
(D-1) a kinematic viscosity at 100° C. is 3 to 10 mm 2 /s,
(D-2) a viscosity index is not less than 120, and
(D-3) a pour point is not higher than −40° C.

5. The lubricating oil composition as claimed in claim 2 , wherein the component (B) is mineral oil (E) satisfying all of the following requirements (E-1) to (E-3):
(E-1) a kinematic viscosity at 100° C. is 3 to 40 mm 2 /s,
(E-2) a viscosity index is not less than 90, and
(E-3) a pour point is not higher than −10° C.

6. The lubricating oil composition as claimed in claim 3 , wherein the component (C) and/or the component (D) is synthetic oil comprising an α-olefin polymer having 8 to 20 carbon atoms and/or an ester compound.

7. The lubricating oil composition as claimed in claim 5 , wherein the component (E) is one or more mineral oils selected from Groups (I), (II) and (III) of the API classification.

8. The lubricating oil composition as claimed in claim 1 , wherein a saturated hydrocarbon content based on the total amount of the components (A) to (E) is not less than 80% by weight.

9. The lubricating oil composition as claimed in claim 1 , which is a gear oil composition.

Assignees

• Mitsui Chemicals Inc

Inventors

• Kaneshige Ryousuke
• Abe Shota

Classifications

• C10N2040/08

  Hydraulic fluids, e.g. brake-fluids · CPC title

• C10M2203/1006

  used as base material · CPC title

• C10M169/044

  the additives being a mixture of non-macromolecular and macromolecular compounds · CPC title

• C10M2207/2835

  used as base material · CPC title

• C10M2203/1025

  used as base material · CPC title