US3269949A - Grease composition - Google Patents

Grease composition Download PDF

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US3269949A
US3269949A US305832A US30583263A US3269949A US 3269949 A US3269949 A US 3269949A US 305832 A US305832 A US 305832A US 30583263 A US30583263 A US 30583263A US 3269949 A US3269949 A US 3269949A
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lubricating oil
grease composition
soap
grease
methyl hydrogen
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Arthur C Borg
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Standard Oil Co
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Standard Oil Co
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M5/00—Solid or semi-solid compositions containing as the essential lubricating ingredient mineral lubricating oils or fatty oils and their use
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
    • C10M2207/128—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/129—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of thirty or more carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/282—Esters of (cyclo)aliphatic oolycarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/34—Esters having a hydrocarbon substituent of thirty or more carbon atoms, e.g. substituted succinic acid derivatives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/40—Fatty vegetable or animal oils
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/40—Fatty vegetable or animal oils
    • C10M2207/404—Fatty vegetable or animal oils obtained from genetically modified species
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/109—Polyethers, i.e. containing di- or higher polyoxyalkylene groups esterified
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2211/00—Organic non-macromolecular compounds containing halogen as ingredients in lubricant compositions
    • C10M2211/06—Perfluorinated compounds
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
    • C10M2213/02—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions obtained from monomers containing carbon, hydrogen and halogen only
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
    • C10M2213/04—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions obtained from monomers containing carbon, hydrogen, halogen and oxygen
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
    • C10M2213/06—Perfluoro polymers
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
    • C10M2213/06—Perfluoro polymers
    • C10M2213/062—Polytetrafluoroethylene [PTFE]
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
    • C10M2229/04—Siloxanes with specific structure
    • C10M2229/041—Siloxanes with specific structure containing aliphatic substituents
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/02—Groups 1 or 11
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/04—Groups 2 or 12
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/10—Semi-solids; greasy

Definitions

  • This invention relates to improved lubricating metal soap greases and particularly to lithium soap greases.
  • methyl hydrogen silicone fluid improves the lubricity and functional properties of such greases.
  • use of methyl hydrogen silicone fluid improves the grease yield and its high temperature stability. While the prior art suggests that methyl hydrogen silicone fluid can be used as a lubricant or as a vehicle for grease under non-oxidizing conditions, the discovery that such fluids in the lubricating oil viscosity range, when used in small amounts, in metal soap greases under oxidizing service conditions would act as a lubricity improver was quite surprising and unexpected and in no way predictable.
  • Lubricating metal soap greases are well known in the art. Such greases are formed by thickening lubricating oil vehicles with metal soaps as the thickening agents. Such metal soaps are the alkali metal and the alkaline earth soaps or unsaturated, partially unsaturated, or saturated fats or fatty acids or hydroxy fatty acids derived from animal, vegetable or marine sources. A fatty acid constituent of such soaps has at least 12 carbon atoms, and preferably from about 12 to 22 carbon atoms.
  • Exemplary of the fatty acids used in preparing metal soap thickening agents are the lauric, myristic, palmitic, stearic, behenic, oleic, hydroxy-stearic, acids, as well as the hydrogenated fish oil fatty acids, hydrogenated castor oil, and mixtures thereof.
  • Exemplary met-a1 soaps are lithium stearate, lithium lZ-hydroxy stearate, sodium stearate, barium stearate, strontium soap of hydrogenation fish oil fatty acids, barium-12-hydroxy stearates, calcium soap of hydrogenated castor oil, potassium stearate, etc. Mixtures of such soaps can also be used.
  • Lubricating oil vehicles that are used in preparing met-a1 soap greases can be petroleum oils in the lubricating oil viscosity range, i.e., from about 25 SSU at 100 F. to about 300 SSU at 310 F. or synthetic hydrocarbon oils such as are obtained by the polymerization of unsaturated hydrocarbons.
  • Other oleaginous materials within the lubricating oil range can be used, such as, for example high molecular weight polyoxyalkylene compounds such as polyalkylene glycol and esters thereof; aliphatic diesters of dicarboxylic acids such as the butyl, hexyl, ethyl hexyl, decyl, lauryl, etc.
  • esters of sebacic acid, adipic acid, azealic acid, etc. polyfluoro derivatives of organic compounds, particularly hydrocarbons, such as trifluorovinyl chloride polymer, trifluorochloroethylene polymer, etc.
  • methyl hydrogen silicone fluid refers to the liquid methyl hydrogen siloxane polymers in the lubricating oil viscosity range.
  • Such polymers are represented by the formula wherein n represents an integer that is suflicient for such polymers to have a viscosity in the lubricating oil viscosity range, namely, of about 25-3500 SSU at 100 F., preferably of about 100-1250 SSU.
  • n represents an integer that is suflicient for such polymers to have a viscosity in the lubricating oil viscosity range, namely, of about 25-3500 SSU at 100 F., preferably of about 100-1250 SSU.
  • Such polymers and their preparation are fully described in US. 2,491,843.
  • Illustrative of the improved soap greases of the present invention are multi-purpose lithium soap greases.
  • Such greases are prepared by conventional procedures by the use of from about 5-25 weight percent of a lithium soap, as a thickening agent, in a lubricating oil.
  • a lithium soap as a thickening agent
  • a solvent-extracted SAE 40 grade petroleum oil was thickened to grease consistency with 8 weight percent lithium soap obtained from the neutralization of a mixture of hydrogenated castor oil and hydrogenated fish oi-l fatty acids with lithium hydroxide.
  • This grease had a Timken value of 15 pounds and an ASTM penetration of 304.
  • methyl hydrogen silicone fluid (GE 398-72-857 having a viscosity of about SSU at F., a viscosity index of about 200, a pour point of less than -80 F., and a specific gravity of 1.0050 at 25 C.).
  • the finished grease containing the methyl hydrogen silicone fluid had a Timken value of 25 pounds, an ASTM penetration of 294 and improved thermal stability at 200 F.
  • the improvement in the Timken value and the reduction in the ASTM penetration value of the lithium soap grease obtained by the addition of the methyl hydrogen silicone fluid illustrates the substantial improvement obtainable by the use of methyl hydrogen silicone fluid.
  • the increase in the Timken value shows that the load beaning property of such greases is substantially improved.
  • the reduced ASTM penetration value shows that the inclusion of methyl hydrogen silicone fluid in a soap grease produces a harder grease. Consequently, it is possible to obtain a greater yield per pound of thickener.
  • methyl hydrogen silicone fluid is a very effective lubricity improver and yield improver additive for conventional lubricating metal so-ap greases.
  • the greases of the present invention can contain added constituents such as antioxidants, oiliness agents, extreme pressure additives, antifoam agents, etc., without in any Way departing from the scope of the invention.
  • the lubricating grease composition consisting essentially of (A) a hydrocarbon lubricating oil; (B) about 525 weight percent of a fatty acid metal soap thickening agent; and (C) about 0.25-10 weight percent of a methyl hydrogen silicone fluid in the lubricating oil viscosity range.
  • lithium soap is derived from a mixture of hydrogenated castor oil fatty acids and hydrogenated fish oil fatty acids.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)

Description

United States Patent 3,269,949 GREASE COMPOSITiON Arthur C. Borg, Chicago, 111., assignor to Standard Oil Company, Chicago, 111., a corporation of Indiana No Drawing. Filed Aug. 30, 1963, Ser. No. 305,832 5 Claims. (Cl. 25242.1)
This invention relates to improved lubricating metal soap greases and particularly to lithium soap greases.
It has been discovered that the use of about 0.25- Weight percent, preferably about l-6 weight percent, of methyl hydrogen silicone fluid in conventional lubricating metal soap greases improves the lubricity and functional properties of such greases. In addition to such improvements, it was unexpectedly found that use of methyl hydrogen silicone fluid improves the grease yield and its high temperature stability. While the prior art suggests that methyl hydrogen silicone fluid can be used as a lubricant or as a vehicle for grease under non-oxidizing conditions, the discovery that such fluids in the lubricating oil viscosity range, when used in small amounts, in metal soap greases under oxidizing service conditions would act as a lubricity improver was quite surprising and unexpected and in no way predictable.
Lubricating metal soap greases are well known in the art. Such greases are formed by thickening lubricating oil vehicles with metal soaps as the thickening agents. Such metal soaps are the alkali metal and the alkaline earth soaps or unsaturated, partially unsaturated, or saturated fats or fatty acids or hydroxy fatty acids derived from animal, vegetable or marine sources. A fatty acid constituent of such soaps has at least 12 carbon atoms, and preferably from about 12 to 22 carbon atoms. Exemplary of the fatty acids used in preparing metal soap thickening agents are the lauric, myristic, palmitic, stearic, behenic, oleic, hydroxy-stearic, acids, as well as the hydrogenated fish oil fatty acids, hydrogenated castor oil, and mixtures thereof. Exemplary met-a1 soaps are lithium stearate, lithium lZ-hydroxy stearate, sodium stearate, barium stearate, strontium soap of hydrogenation fish oil fatty acids, barium-12-hydroxy stearates, calcium soap of hydrogenated castor oil, potassium stearate, etc. Mixtures of such soaps can also be used.
Lubricating oil vehicles that are used in preparing met-a1 soap greases can be petroleum oils in the lubricating oil viscosity range, i.e., from about 25 SSU at 100 F. to about 300 SSU at 310 F. or synthetic hydrocarbon oils such as are obtained by the polymerization of unsaturated hydrocarbons. Other oleaginous materials within the lubricating oil range can be used, such as, for example high molecular weight polyoxyalkylene compounds such as polyalkylene glycol and esters thereof; aliphatic diesters of dicarboxylic acids such as the butyl, hexyl, ethyl hexyl, decyl, lauryl, etc. esters of sebacic acid, adipic acid, azealic acid, etc.; polyfluoro derivatives of organic compounds, particularly hydrocarbons, such as trifluorovinyl chloride polymer, trifluorochloroethylene polymer, etc.
The term methyl hydrogen silicone fluid as used herein and in the claims refers to the liquid methyl hydrogen siloxane polymers in the lubricating oil viscosity range. Such polymers are represented by the formula wherein n represents an integer that is suflicient for such polymers to have a viscosity in the lubricating oil viscosity range, namely, of about 25-3500 SSU at 100 F., preferably of about 100-1250 SSU. Such polymers and their preparation are fully described in US. 2,491,843.
Illustrative of the improved soap greases of the present invention are multi-purpose lithium soap greases. Such greases are prepared by conventional procedures by the use of from about 5-25 weight percent of a lithium soap, as a thickening agent, in a lubricating oil. For example, a solvent-extracted SAE 40 grade petroleum oil was thickened to grease consistency with 8 weight percent lithium soap obtained from the neutralization of a mixture of hydrogenated castor oil and hydrogenated fish oi-l fatty acids with lithium hydroxide. This grease had a Timken value of 15 pounds and an ASTM penetration of 304. To a portion of this grease was added 1 weight percent of methyl hydrogen silicone fluid (GE 398-72-857 having a viscosity of about SSU at F., a viscosity index of about 200, a pour point of less than -80 F., and a specific gravity of 1.0050 at 25 C.). After milling, the finished grease containing the methyl hydrogen silicone fluid had a Timken value of 25 pounds, an ASTM penetration of 294 and improved thermal stability at 200 F. The improvement in the Timken value and the reduction in the ASTM penetration value of the lithium soap grease obtained by the addition of the methyl hydrogen silicone fluid illustrates the substantial improvement obtainable by the use of methyl hydrogen silicone fluid. The increase in the Timken value shows that the load beaning property of such greases is substantially improved. The reduced ASTM penetration value shows that the inclusion of methyl hydrogen silicone fluid in a soap grease produces a harder grease. Consequently, it is possible to obtain a greater yield per pound of thickener.
It will be apparent to one skilled in the art that methyl hydrogen silicone fluid is a very effective lubricity improver and yield improver additive for conventional lubricating metal so-ap greases.
It is to be understood that the greases of the present invention can contain added constituents such as antioxidants, oiliness agents, extreme pressure additives, antifoam agents, etc., without in any Way departing from the scope of the invention.
I claim:
1. The lubricating grease composition consisting essentially of (A) a hydrocarbon lubricating oil; (B) about 525 weight percent of a fatty acid metal soap thickening agent; and (C) about 0.25-10 weight percent of a methyl hydrogen silicone fluid in the lubricating oil viscosity range.
2. The grease composition of claim 1 wherein said lubricating oil is petroleum lubricating oil.
3. The grease composition of claim 2 wherein said metal soap is a lithium soap.
4. The grease composition of claim 3 wherein said lithium soap is derived from a mixture of hydrogenated castor oil fatty acids and hydrogenated fish oil fatty acids.
5. The grease composition of claim 4 wherein the amount of said silocone fluid is about 1-6 percent.
References Cited by the Examiner UNITED STATES PATENTS 2,491,843 12/1949 Wilcock 252-49.6 3,145,175 8/1964 Wright 252-42.1
FOREIGN PATENTS 926,700 5/1963 Great Britain.
DANIEL E. WYMAN, Primary Examiner.
I. VAUGHN, Assistant Examiner.

Claims (3)

1. THE LUBRICATING GREASE COMPOSITION CONSISTING ESSENTIALLY OF (A) A HYDROCARBON LUBRICATING OIL; (B) ABOUT 5-25 WEIGHT PERCENT OF A FATTY ACID METAL SOAP THICKENING AGENT; AND (C) ABOUT 0.25-10 WEIGHT PERCENT OF A METHYL HYDROGEN SILICONE FLUID IN THE LUBRICATING OIL VISCOSITY RANGE.
2. THE GREASE COMPOSITION OF CLAIM 1 WHEREIN SAID LUBRICATING OIL IS PETROLEUM LUBRICATING OIL.
3. THE GREASE COMPOSITION OF CLAIM 2 WHEREIN SAID METAL SOAP IS A LITHIUM SOAP.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3518188A (en) * 1966-09-15 1970-06-30 Wacker Chemie Gmbh Silicone compounds and greases
US4059534A (en) * 1976-04-07 1977-11-22 Union Carbide Canada Limited Hydrocarbon/silicon oil lubricating compositions for low temperature use
US4840739A (en) * 1987-03-17 1989-06-20 Shin-Etsu Chemical Co., Ltd. Adhesive grease composition comprising a random copolymer of ethylene and an alpha-olefin
US5534173A (en) * 1994-08-30 1996-07-09 Amway Corporation Light duty lubricant composition and method of use

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2491843A (en) * 1946-03-21 1949-12-20 Gen Electric Liquid linear methylpolysiloxanes
GB926700A (en) * 1960-05-16 1963-05-22 Gen Electric Organopolysiloxane grease compositions
US3145175A (en) * 1962-06-25 1964-08-18 Gen Electric Grease composition

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US3518188A (en) * 1966-09-15 1970-06-30 Wacker Chemie Gmbh Silicone compounds and greases
US4059534A (en) * 1976-04-07 1977-11-22 Union Carbide Canada Limited Hydrocarbon/silicon oil lubricating compositions for low temperature use
US4840739A (en) * 1987-03-17 1989-06-20 Shin-Etsu Chemical Co., Ltd. Adhesive grease composition comprising a random copolymer of ethylene and an alpha-olefin
US5534173A (en) * 1994-08-30 1996-07-09 Amway Corporation Light duty lubricant composition and method of use

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