Star polymer lubricating composition

Patent metadata

Field	Value
Publication number	US-9359577-B2
Application number	US-29816607-A
Country	US
Kind code	B2
Filing date	Apr 19, 2007
Priority date	Apr 24, 2006
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

The invention provides a lubricating composition containing (a) a polymer derived from greater than 50 wt % or more of a non-diene monomer, wherein the polymer has a weight average molecular weight of about 2000 to about 200,000, and wherein the polymer has a shear stability index of about 0 to about 25; (b) a phosphorus-containing acid, salt, or ester; (c) an extreme pressure agent, other than a phosphorus-containing acid, salt, or ester; and (d) an oil of lubricating viscosity. The invention further provides a method for lubricating a mechanical device with the lubricating composition.

First claim

What is claimed is:

1. A lubricating composition comprising:
(a) about 0.1 wt % to about 25 wt % of a polymer derived from greater than 50 wt % or more of a non-diene monomer, wherein the polymer has radial or star architecture;
(b) about 0.1 wt % to about 5 wt % of a phosphorus-containing acid, salt, or ester, wherein the phosphorus-containing acid, salt, or ester comprises an amine salt of a phosphorus acid or ester;
(c) about 0.1 wt % to about 8 wt % of an extreme pressure agent, wherein the extreme pressure agent, other than a phosphorus-containing acid, salt, or ester comprises a dimercaptothiadiazole, wherein the dimercaptothiadiazole comprises 2,5-dimercapto-1,3-4-thiadiazole hydrocarbyl-substituted 2,5-dimercapto-1,3-4-thiadiazole, or oligomers thereof; and
(d) an oil of lubricating viscosity,

wherein the polymer is obtained from a RAFT polymerisation process,
wherein the polymer is a polymethacrylate having 7 or more arms, and
wherein the polymethacrylate is derived from a monomer composition comprising:
(a) about 65 wt % to about 95 wt % of an alkyl methacrylate comprising a mixture of alkyl methacrylates having 12 to 15 carbon atoms,
(b) about 5 wt % to about 30 wt % of an alkyl methacrylate, wherein the alkyl group of the methacrylate has about 1 to about 9 carbon atoms; and
(c) about 0 wt % to about 10 wt % of a nitrogen containing monomer, wherein the polymethacrylate architecture is random or tapered.

2. The lubricating composition of claim 1 , wherein the polymer has a weight average molecular weight of about 15,000 to about 75,000.

3. The lubricating composition of claim 1 , wherein the polymer has a shear stability index of about 0 to about 20.

4. The lubricating composition of claim 1 , wherein the polymer is a copolymer.

5. The lubricating composition of claim 1 , wherein the lubricating composition further comprises a component of linear polymer chains.

6. The lubricating composition of claim 1 , wherein the polymer has a random architecture.

7. A method for lubricating a mechanical device comprising a supplying to the mechanical device a lubricating composition, wherein the mechanical device is a gear, a gearbox or a manual transmission, and wherein the lubricating composition comprises:
(a) 0.1 to 25% wt % of a polymer derived from greater than 50 wt % or more of a non-diene monomer, wherein the polymer has radial or star architecture;
(b) about 0.1 wt % to about 5 wt % of a phosphorus-containing acid, salt, or ester, wherein the phosphorus-containing acid, salt, or ester comprises an amine salt of a phosphorus acid or ester;
(c) about 0.1 wt % to about 8 wt % of an extreme pressure agent, wherein the extreme pressure agent, other than a phosphorus-containing acid, salt, or ester comprises a dimercaptothiadiazole, wherein the dimercaptothiadiazole comprises 2,5-dimercapto-1,3-4-thiadiazole hydrocarbyl-substituted 2,5-dimercapto-1,3-4-thiadiazole, or oligomers thereof; and
(d) an oil of lubricating viscosity,

wherein the polymer is obtained from a RAFT polymerisation process,
wherein the polymer is a polymethacrylate having 7 or more arms, or mixtures thereof, and
wherein the polymethacrylate is derived from a monomer composition comprising:
(a) about 65 wt % to about 95 wt % of an alkyl methacrylate comprising a mixture of alkyl methacrylates having 12 to 15 carbon atoms,
(b) about 5 wt % to about 30 wt % of an alkyl methacrylate, wherein the alkyl group of the methacrylate has about 1 to about 9 carbon atoms; and
(c) about 0 wt % to about 10 wt % of a nitrogen containing monomer, wherein the polymethacrylate architecture is random or tapered.

8. The method of claim 7 , wherein the polymer has a weight average molecular weight of about 15,000 to about 75,000.

9. The method of claim 7 , wherein the polymer has a shear stability index of about 0 to about 20.

10. The method of claim 7 , wherein the polymer is a copolymer.

11. The method of claim 7 , wherein the lubricating composition further comprises a component of linear polymer chains.

12. The method of claim 7 , wherein the amine salt is formed from an amine having at least one hydrocarbyl group.

13. The method of claim 7 , wherein the amine salt is formed from an amine having two hydrocarbyl groups.

14. The method of claim 7 , wherein the amine salt is formed from an amine having three hydrocarbyl groups.

15. The method of claim 7 , wherein the amine salt is formed from an amine having a hydrocarbyl group having about 10 to about 20 carbon atoms.

16. The method of claim 7 , wherein the amine salt is formed from an amine having a hydrocarbyl group having about 13 to about 19 carbon atoms.

Assignees

• Baker Mark R
• Baum Marina
• Schober Barton J
• Lubrizol Corp

Inventors

• Baker Mark R
• Baum Marina
• Schober Barton J

Classifications

• C10N2040/044

  for manual transmissions · CPC title

• C10N2020/073

  Star shaped polymers · CPC title

• C10N2040/04

  Oil-bath; Gear-boxes; Automatic transmissions; Traction drives · CPC title

• C10N2040/046

  for traction drives · CPC title

• C10N2040/045

  for continuous variable transmission [CVT] · CPC title