LUBRICATING OIL COMPOSITION

• US 20150119305A1
• Filed: 06/04/2013
• Published: 04/30/2015
• Est. Priority Date: 06/04/2012
• Status: Abandoned Application

• Current Assignee: Shell Oil Company (Shell Plc)
• Original Assignee: Shell Oil Company (Shell Plc)
• Inventors: Nagakari, Mitsuhiro, Otsuka, Ayano
• Application Number:
  US14/404,959
• Publication Number:
  US 20150119305A1
• Time in Patent Office: Days
• US Class Current: 508/512
• CPC Class Codes: C10M 145/14 Acrylate; Methacrylate
• 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 2205/02 containing acyclic monomers
• CPC Class Codes: C10M 2205/022 Ethene
• CPC Class Codes: C10M 2205/0285 used as base material
• CPC Class Codes: C10M 2205/173 used as base material
• CPC Class Codes: C10M 2207/283 of polyhydroxy compounds
• CPC Class Codes: C10M 2209/084 Acrylate; Methacrylate
• CPC Class Codes: C10N 2020/017 Specific gravity or density
• CPC Class Codes: C10N 2020/02 Viscosity; Viscosity index
• CPC Class Codes: C10N 2020/04 Molecular weight; Molecular weight distribution
• CPC Class Codes: C10N 2030/02 Pour-point; Viscosity index
• CPC Class Codes: C10N 2030/04 Detergent property or dispersant property
• CPC Class Codes: C10N 2030/10 Inhibition of oxidation, e.g. anti-oxidants
• CPC Class Codes: C10N 2030/72 Extended drain
• CPC Class Codes: C10N 2040/02 Bearings
• CPC Class Codes: C10N 2040/04 Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
• CPC Class Codes: C10N 2040/06 Instruments or other precision apparatus, e.g. damping fluids
• CPC Class Codes: C10N 2040/08 Hydraulic fluids, e.g. brake-fluids
• CPC Class Codes: C10N 2040/135 Steam engines or turbines
• CPC Class Codes: C10N 2040/25 : Internal-combustion engines
• CPC Class Codes: C10N 2040/30 : Refrigerators lubricants or compressors lubricants

Abstract

The object of this invention is to offer a lubricating oil composition which has superior extreme pressure properties (ability to prevent welding), which generates a small amount of sludge and which also has a high viscosity index. The invention provides a lubricating oil composition to which has been added a copolymer of specified olefins and alkyl methacrylates.

Claims

1. A lubricating oil composition comprising:

(A) 50 to 90% by mass of a base oil selected from the group consisting of a Group II base oil, a Group III base oil, a Group IV base oil, and any combination thereof;

(B) 10 to 50% by mass of a copolymer of an olefin having from 2 to 20 carbons and an alkyl methacrylate having alkyl groups with from 1 to 20 carbons, wherein the copolymer has a molecular weight of from 1,200 to 50,000; and

(C) 5 to 15% by mass of a carboxylic acid ester compound.

2. The lubricating oil composition according to claim 1, wherein the base oil is a polyalphaolefin or a GTL (gas-to-liquid) oil.

3. The lubricating oil composition according to claim 1, wherein the copolymer has a weight average molecular weight of from 7,000 to 20,000.

4. The lubricating oil composition according to claim 1, wherein the carboxylic acid ester compound is a polyol ester.

5. The lubricating oil composition according to claim 1, wherein the lubricating oil composition has a kinematic viscosity at 40°

C. of from 140 to 320 mm²/s, a viscosity index of not less than 150, and produces no more than 1,200 mg/kg of sludge in a Dry TOST test.

6. (canceled)

7. (canceled)

8. A method of lubrication comprising:

supplying a lubricating oil composition to a surface in relative movement to another surface, wherein the lubricating oil composition comprises;

(A) 50 to 90% by mass of a base oil selected from the group consisting of a Group II base oil, a Group III base oil, a Group IV base oil, and any combination thereof;

(B) 10 to 50% by mass of a copolymer of an olefin having from 2 to 20 carbons and an alkyl methacrylate having alkyl groups with from 1 to 20 carbons, wherein the copolymer has a molecular weight of from 1,200 to 50,000; and

(C) 5 to 15% by mass of a carboxylic acid ester compound.

9. The method according to claim 8, wherein the base oil is a polyalphaolefin or a GTL (gas-to-liquid) oil.

10. The method according to claim 8, wherein the copolymer has a weight average molecular weight of from 7,000 to 20,000.

11. The method according to claim 8, wherein the carboxylic acid ester compound is a polyol ester.

12. The method according to claim 8, wherein the lubricating oil composition has a kinematic viscosity at 40°

C. of from 140 to 320 mm²/s, a viscosity index of not less than 150, and produces no more than 1,200 mg/kg of sludge in a Dry TOST test.

13. The method according to claim 8, wherein the surface is a gear.

14. The method according to claim 13, wherein the gear is in an apparatus for wind-power generation of electricity.

15. A method of lubrication comprising:

supplying a lubricating oil composition to a surface of a gear, wherein the lubricating oil composition comprises;

(A) 50 to 90% by mass of a base oil selected from the group consisting of a Group II base oil, a Group III base oil, a Group IV base oil, and any combination thereof; and

(B) 10 to 50% by mass of a copolymer of an olefin and an alkyl methacrylate, wherein the copolymer has a molecular weight of from 1,200 to 50,000.

16. The method according to claim 15, wherein the gear is in an apparatus for wind-power generation of electricity.

17. The method according to claim 15, wherein the base oil is a polyalphaolefin or a GTL (gas-to-liquid) oil.

18. The method according to claim 15, wherein the copolymer has a weight average molecular weight of from 7,000 to 20,000.

19. The method according to claim 15, wherein the lubricating oil composition further comprises:

(C) 5 to 15% by mass of a carboxylic acid ester compound.

20. The method according to claim 15, wherein the lubricating oil composition has a kinematic viscosity at 40°

C. of from 140 to 320 mm²/s, a viscosity index of not less than 150, and produces no more than 1,200 mg/kg of sludge in a Dry TOST test.