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Lubricating composition




Title: Lubricating composition.
Abstract: The present invention relates to a lubricating composition containing a dispersant, a corrosion inhibitor and an antioxidant. The invention further provides a method for lubricating a mechanical device with the lubricating composition. ...


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USPTO Applicaton #: #20100160191
Inventors: Betsy J. Butke, Hirohito Hasegawa, Tadashi Yoshimura, Carlos Cerda De Groote


The Patent Description & Claims data below is from USPTO Patent Application 20100160191, Lubricating composition.

FIELD OF INVENTION

The present invention relates to a lubricating composition containing a dispersant, a corrosion inhibitor and an antioxidant. The invention further provides a method for lubricating a mechanical device, typically requiring a working fluid, a hydraulic fluid, a circulating oil or a turbine oil, with the lubricating composition.

BACKGROUND

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OF THE INVENTION

Ash-containing and ashless lubricating compositions are utilised in various mechanical devices (for example stationary or mobile machinery requiring a working fluid, a hydraulic fluid, a circulating oil or a turbine oil). The lubricating compositions often operate under high temperatures and/or high pressure regimes in the mechanical device. The high temperatures and/or high pressure regimes are believed to decompose additives in the lubricating composition that are less thermally and/or oxidatively stable. Typically additives that tend to decompose are often ash-containing additives that contain a metal. Furthermore, as ash-containing additives decompose, divalent metals such as zinc, calcium or magnesium, are released into the lubricating composition. The divalent metals are then capable of reacting with other performance additives present in the lubricating composition, such as alkenyl succinic anhydrides and alkenyl succinimides creating sludge and other particulate matter that can cause filter plugging.

In an attempt to overcome the difficulties associated with lubricating a mechanical device with ash-containing lubricating compositions, ashless formulations have been contemplated. However, the formulation of an ashless lubricating composition suitable for a mechanical device may be difficult and many compositions are believed to have at least one of limited oxidative stability, limited thermal stability, filter plugging, and produce unacceptable levels of sludge.

EP 0 821 053 A2 discloses a synergistic antioxidant composition composed of amine salts of alkyl phosphates and ethylene diamine, ammonium or metal salts of alkylarylsulphonates. The antioxidant composition is useful for zinc-free antiwear hydraulic fluids.

International Application WO 00/11122 discloses lubricating compositions containing (I) 100 pbw of a base oil, (II) an antiwear agent comprising (i) from 0.05 to 10 pbw of a phosphorothionate and from 0.01 to 1.0 pbw of an amine salt of phosphorus compound and/or (ii) from 0.05 to 10 pbw of a dithiophosphate, and (III) a rust preventing agent comprising from 0.01 to 1.0 pbw of an amide obtained by reacting a polyalkylene polyamine and a carboxylic acid having from 4 to 30 carbon atoms. The lubricating composition is suitable for hydraulic systems.

U.S. Pat. No. 5,922,657 discloses a hydraulic fluid containing a base oil selected from mineral, vegetable and synthetic oils, β-dithiophosphorylated propionic acid, and at least one oil additive from the group consisting of antioxidants, metal passivators, rust inhibitors, dispersants, detergents, viscosity index improvers, pour point depressants, antifoams, solid lubricants and further antiwear agents.

US Patent Application 2002/0010103 A1 discloses industrial oils such as hydraulic oils containing (a) at least one a compound selected from the group consisting of a phosphoric acid ester, a thiophosphoric acid ester, and amine salts thereof; (b) at least one of a phosphorus acid ester and/or an amine salt thereof; and (c) at least one compound selected from the group consisting of an alkenyl succinimide, an alkenyl succinic acid ester, benzylamine, and derivatives thereof.

International Application WO 04/113479 discloses industrial fluids containing (1) an antiwear package comprising: (a) a hydrocarbyl phosphate and amine salt thereof; and (b) an alkylene coupled adduct of a hydrocarbyl substituted dithiophosphoric acid and a α,β-unsaturated carbonyl containing compound; (2) an antioxidant package comprising: (a) a hydrocarbyl diphenylamine; and (b) a sterically hindered phenol; (3) a metal deactivator; and (4) an oil of lubricating viscosity.

Hence it would be desirable to discover a lubricating composition suitable for a mechanical device capable of reducing or minimising at least one of filter plugging, limited oxidative stability, limited thermal stability, and produce unacceptable levels of sludge. The present invention provides a lubricating composition and method of lubricating a mechanical device capable of reducing or minimising at least one of filter plugging, limited oxidative stability, limited thermal stability, and produce unacceptable levels of sludge.

SUMMARY

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OF THE INVENTION

In one embodiment the invention provides an ashless lubricating composition comprising:

(a) a dispersant;

(b) an antioxidant;

(c) a corrosion inhibitor; and

(d) an oil of lubricating viscosity.

In one embodiment the invention provides a method for lubricating a mechanical device (typically requiring a working fluid, a hydraulic fluid, a circulating oil or a turbine oil) comprising supplying to the mechanical device an ashless lubricating composition comprising:

(a) a dispersant;

(b) an antioxidant;

(c) a corrosion inhibitor; and

(d) an oil of lubricating viscosity.

In one embodiment the invention provides an ashless lubricating composition comprising:

(a) about 0.01 to about 2 wt % of a dispersant;

(b) about 0.01 to about 2 wt % of an antioxidant;

(c) about 0.0001 wt % to about 0.1 wt % of a corrosion inhibitor; and

(d) an oil of lubricating viscosity.

In one embodiment the invention provides a method for lubricating a mechanical device (typically requiring a working fluid, a hydraulic fluid, a circulating oil or a turbine oil) comprising supplying to the mechanical device an ashless lubricating composition comprising:

(a) about 0.01 to about 2 wt % of a dispersant;

(b) about 0.01 to about 2 wt % of an antioxidant;

(c) about 0.0001 wt % to about 0.1 wt % of a corrosion inhibitor; and

(d) an oil of lubricating viscosity.

In one embodiment the ashless lubricating compositions disclosed above further comprises an antiwear agent. In one embodiment the ashless lubricating compositions disclosed above further contain about 0.05 wt % to about 1.5 wt % of an antiwear agent.

In one embodiment the invention provides the ashless lubricating compositions disclosed above in the form of a concentrate.

DETAILED DESCRIPTION

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OF THE INVENTION

The present invention provides an ashless lubricating composition and a method for lubricating a mechanical device as disclosed above.




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lubricating oil additive composition and method of making the same
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Solid anti-friction devices, materials therefor, lubricant or separant compositions for moving solid surfaces, and miscellaneous mineral oil compositions
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stats Patent Info
Application #
US 20100160191 A1
Publish Date
06/24/2010
Document #
File Date
12/31/1969
USPTO Class
Other USPTO Classes
International Class
/
Drawings
0




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Solid Anti-friction Devices, Materials Therefor, Lubricant Or Separant Compositions For Moving Solid Surfaces, And Miscellaneous Mineral Oil Compositions   Lubricants Or Separants For Moving Solid Surfaces And Miscellaneous Mineral Oil Compositions (e.g., Water Containing, Etc.)   Organic Compound Containing Boron   Borated Or Boronated Carbonated Or Overbased Organic Acid Salts (e.g., Borated Overbased Carbonated Sulfonates, Etc.)  

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20100624|20100160191|lubricating composition|The present invention relates to a lubricating composition containing a dispersant, a corrosion inhibitor and an antioxidant. The invention further provides a method for lubricating a mechanical device with the lubricating composition. |The-Lubrizol-Corporation
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