Classifications

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  • 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
  • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
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  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
  • C10M107/20—Lubricating compositions characterised by the base-material being a macromolecular compound containing oxygen
  • C10M107/30—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • C10M107/32—Condensation polymers of aldehydes or ketones; Polyesters; Polyethers
  • C10M107/34—Polyoxyalkylenes
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  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M117/00—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof
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  • 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
  • C10M2207/121—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms
  • C10M2207/123—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms polycarboxylic
  • C10M2207/1236—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms polycarboxylic used as thickening agent
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  • 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
  • C10M2207/127—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 polycarboxylic
  • C10M2207/1276—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 polycarboxylic used as thickening agent
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  • 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
  • C10M2207/1285—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 used as thickening agents
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  • 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
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  • 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
  • C10M2207/22—Acids obtained from polymerised unsaturated 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
  • 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
  • C10M2209/1033—Polyethers, i.e. containing di- or higher polyoxyalkylene groups used as base material
• • 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
  • C10M2209/104—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only
  • C10M2209/1045—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only used as base material
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  • 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
  • C10M2209/105—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing three carbon atoms only
  • C10M2209/1055—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing three carbon atoms only used as base material
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  • 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
  • C10M2209/106—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing four carbon atoms only
  • C10M2209/1065—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing four carbon atoms only used as base material
• • 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
  • C10M2209/107—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of two or more specified different alkylene oxides covered by groups C10M2209/104 - C10M2209/106
  • C10M2209/1075—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of two or more specified different alkylene oxides covered by groups C10M2209/104 - C10M2209/106 used as base material
• • 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
  • C10M2209/108—Polyethers, i.e. containing di- or higher polyoxyalkylene groups etherified
  • C10M2209/1085—Polyethers, i.e. containing di- or higher polyoxyalkylene groups etherified used as base material
• • 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
  • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
  • C10N2020/01—Physico-chemical properties
  • C10N2020/04—Molecular weight; Molecular weight distribution
• • 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
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• • 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
  • C10N2040/00—Specified use or application for which the lubricating composition is intended
  • C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
• • 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
  • C10N2040/00—Specified use or application for which the lubricating composition is intended
  • C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
  • C10N2040/044—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives for manual transmissions
• • 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—Form in which the lubricant is applied to the material being lubricated semi-solid; greasy

Definitions

• the present invention relates to lubricating grease compositions, particularly to lubricating grease compositions for use in flywheel applications, in particular, for use in dual mass flywheel applications.
• the primary purpose of lubrication is separation of solid surfaces moving relative to one another, to minimise friction and wear.
• the materials most frequently used for this purpose are oils and greases.
• the choice of lubricant is mostly determined by the particular application.
• Lubricating greases are the lubricants of choice in a dual mass flywheel application.
• a dual mass flywheel eliminates excessive transmission gear rattle, reduces gear change/shift effort, and increases fuel economy.
• Dual mass flywheels are typically fitted to light-duty diesel trucks with standard manual transmissions and to higher performance luxury vehicles to dampen vibration in the drive train. This allows vehicles to be operated for longer periods without long term damage.
• Greases based on lithium soap complexes are known for use in flywheel applications. Such greases have been found to provide satisfactory lubricating properties. However, due to ever increasing demands for higher performance, it would be desirable to provide greases for use in mass flywheel applications which exhibit improved lubrication properties, and in particular, improved friction reducing properties.
• US2003/087768 discloses a grease comprising polypropylene glycol and polyol ester as base oil thickened with lithium soap thickener comprising 12 - OH stearic acid and azelaic acid (or sebacic acid), a metal oxide and oleic acid amide, ethylene diamine stearate, disodium sebacate.
• JP57055997 discloses a rust- proofing grease composition
• synthetic oil polyol ester or polyester
• lithium soap thickener dimer acid (as rust inhibitor) benzotriazole
• metal thiocarbamate metal thiocarbamate
• a lubricating grease composition comprising:
• the grease compositions of the present invention exhibit excellent friction reducing properties, as well as good stability, good wear properties, high resistance to centrifugal forces and increased grease lifetime.
• the lubricating grease of the present invention comprises, as an essential component, a polyalkylene glycol base oil.
• polyalkylene glycol base oil used in lubricating compositions according to the present invention, and various conventional polyalkylene glycols may be conveniently used.
• the polyalkylene glycols (PAG) used according to the invention may exhibit alkylene oxide units with 1 to 6 carbon atoms (-R-O-) as monomer units.
• the polyalkylene glycols may exhibit hydrogen end groups, alkyl, aryl, alkylaryl, aryloxy, alkoxy, alkylaryloxy and/or hydroxy end groups.
• Alkylaryloxy groups should also be understood to mean arylalkyl (ene)oxy groups and alkylaryl groups to mean arylalkyl(ene) groups (e.g. aryl CH 2 CH 2 -).
• the end groups of the alkyl type, including the alkoxy type, or of the aryl types, including the alkylaryl type, aryloxy type and alkylaryloxy type preferably exhibit 6 to 24 carbon atoms, particularly preferably 6 to 18 carbon atoms, based on the aryl types, and preferably 1 to 12 carbon atoms, based on the alkyl types.
• the polyalkylene glycols used herein have a density which is similar to that of the lithium complex soaps (e.g. lithium sebacate, lithium azelate) used in the compositions.
• the polyalkylene glycols used herein have a density of from 900 to 1400 Kg/m 3 , more preferably from 950 to 1100 Kg/m 3 , even more preferably from 1000 to 1100 Kg/m 3 .
• the polyalkylene glycols according to the invention may be either homopolymers, namely polypropylene glycol (and/or polypropylene oxide) or copolymers, terpolymers etc.
• the monomer units may exhibit a random distribution or a block structure. If the polyalkylene glycols are not homopolymers, preferably at least 20%, preferably at least 40% of all monomer units are producible from polypropylene oxide (PO), and also preferably, at least 20% of all monomer units of these polyalkylene glycols are producible by using ethylene oxide (EO) (PO/EO copolymers).
• PO polypropylene oxide
• EO ethylene oxide
• preferably at least 20%, preferably at least 40% of all monomer units are obtainable from butylene oxide (BO) and, moreover, preferably at least 20% of all monomer units of these polyalkylene glycols are obtainable by using ethylene oxide (BO/EO copolymers).
• BO butylene oxide
• BO/EO copolymers ethylene oxide
• preferably at least 50%, more preferably at least 80% of all monomer units are producible from propylene oxide, with the remainder producible from ethylene oxide.
• the polyalkylene glycols are homopolymers of propylene oxide.
• Suitable examples of polypropylene homopolymers are commercially available from Dow Chemicals under the tradename Synalox (RTM), for example, Synalox (RTM) 100-150B.
• the starting compound is incorporated into the polymer and, according to the meaning of the invention, also referred to as end group of the polymer chain.
• Suitable starting groups consist of compounds comprising active hydrogen such as e.g. water, n-butanol, propylene glycol, ethylene glycol, neopentyl glycols such as pentaerythritol, ethylene diamine, phenol, cresol or other (C 1 to C 16 (mono, di or tri)alkyl) aromatics, (hydroxyalkyl) aromatics, hydroquinone, aminoethanolamines, triethylenetetramines, polyamines, sorbitol or other sugars.
• Other C-H acidic compounds such as carboxylic acids or carboxylic anhydrides, can also be used as starting compounds.
• Other suitable starting compounds include longer chain alcohols, such as C 10 to C 18 alcohols.
• the polyalkylene glycols comprise aryl groups or corresponding heteroaromatic groups, e.g. inserted into the polymer chain, as side groups or end groups; the groups may, if necessary, be substituted with linear or branched alkyl groups or alkylene groups, the alkyl groups or alkylene groups overall exhibiting preferably 1 to 18 carbon atoms.
• Cyclic ether alcohols such as hydroxyfurfuryl or hydroxytetrahydrofuran, nitrogen heterocyclics or sulphur heterocyclics can also be used as starting groups.
• Such polyalkylene glycols are disclosed in WO 01/57164 , the teaching of which is herewith incorporated by reference.
• the polyalkylene glycols according to the invention have an average molecular weight (number average) of from 200 to 6000 g/mole, more preferably from 400 to 4000 g/mole, even more preferably from 1000 to 3000 g/mole and especially from 2000 to 3000 g/mole.
• the polyalkylene glycols used according to the invention can be produced by reacting alcohols, including polyalcohols, as starting compounds with oxiranes such as ethylene oxide, propylene oxide and/or butylene oxide. Following the reaction, these possess only one free hydroxy group as end group. Polyalkylene glycols with only one hydroxy group are preferred over those with two free hydroxy groups. Polyalkylene glycols which, e.g. after a further etherification step, comprise no free hydroxy groups any longer are particularly preferred regarding the stability, hygroscopicity and compatibility. The alkylation of terminal hydroxyl groups leads to an increase in the thermal stability.
• the PAG base oil comprises end-capped PAG, i.e. where no free hydroxyl groups are present.
• the lubricating composition comprises at least 30 wt.% PAG base oil, preferably at least 50 wt.%, more preferably at least 70 wt.%, based on the total weight of the lubricating composition. It is even more preferred that as the base oil only (one or more) PAG base oil(s) is used.
• the PAG base oil has a kinematic viscosity at 40°C (according to ASTM D445) of from 32 to 690, preferably from 100 to 300, more preferably from 150 to 250 mm 2 /s.
• the base oil in addition to the polyalkylene glycol base oil, it is possible to include further base oils, which may be any of the conventionally used lubricating oils of mineral or synthetic origin. However, in a preferred embodiment of the invention the base oil consists only of one or more polyalkylene glycol base oils.
• Base oils of mineral origin may be mineral oils, for example produced by solvent refining or hydro-processing.
• Base oils of synthetic origin may typically be mixtures of C 10-50 hydrocarbon polymers, for example liquid polymers of alpha-olefins. They may also be conventional esters, for example polyol esters.
• the base oil may also be a mixture of these oils.
• the base oil is that of mineral origin sold by the Royal Dutch/Shell Group of Companies under the designations "HVI” or "MVIN”, is a polyalphaolefin, or a mixture of the two.
• Synthetic hydrocarbon base oils for example those sold by the Royal Dutch/Shell Group of Companies under the designation "XHVI” (trade mark) may also be used.
• mineral lubricating oil base stocks used in preparing the greases can be any conventionally refined base stocks derived from paraffinic, naphthenic and mixed base crudes.
• the lubricating grease compositions of the present invention further comprise a lithium soap complex thickener.
• the amount of lithium soap complex present in the grease is preferably from 2% to 30%, preferably from 5% to 20%, by weight of the composition.
• the lithium soap complex comprises a lithium soap of a C 12 to C 24 hydroxy fatty acid and a lithium soap of a C 2 to C 12 aliphatic dicarboxylic acid.
• the lithium soap of the hydroxy fatty acid is a C 16 to C 20 hydroxy fatty acid.
• a particularly preferred hydroxy fatty acid is hydroxystearic acid, for example, 9-hydroxy, 10-hydroxy, or 12-hydroxystearic acid, more preferably the latter.
• Ricinoleic acid which is an unsaturated form of 12-hydroxystearic acid having a double bond in the 9-10 position, can also be used.
• Other suitable hydroxy fatty acids include 12-hydroxybehenic acid and 10-hydroxypalmitic acid.
• the dicarboxylic acid is preferably a C 4 to C 12 , more preferably C 6 to C 10 , aliphatic dicarboxylic acid.
• suitable acids include oxalic, malonic, succinic, glutaric, adipic, suberic, pimelic, azelaic, dodecanedioic and sebacic acids. Azelaic and sebacic acids are especially preferred.
• the C 12 to C 24 hydroxy fatty acid and the C 2 to C 12 aliphatic dicarboxylic acid are preferably present in a weight ratio of from 20:1 to 1:1, preferably from 10:1 to 1:1, more preferably from 8:1 to 3:1.
• Another essential component of the lubricating grease compositions of the present invention is a carboxylic acid selected from dimer and trimer acids having the general formula R(COOH) n , wherein n is 2 or 3, and wherein R is a hydrocarbon radical having from 36 to 54 carbon atoms.
• Said carboxylic acid is present in an amount of from 0.1% to 10%, preferably from about 1% to about 10%, more preferably from about 1% to about 5%, by weight of the composition.
• the long chain carboxylic acid is selected from dimer and trimer acids, which are polycarboxylic acids having the general formula R(COOH) n , wherein n is 2 or 3, and where R is a hydrocarbon radical within the range of 36 to 54 carbon atoms, which may be saturated or unsaturated.
• Linoleic dimer acid is formed by reaction of two molecules of linoleic acid in a typical Diels-Alder reaction.
• Linoleic trimer acid is a C 54 tricarboxylic acid formed by polymerization of three molecules of linoleic acid which are linked together by their unsaturation.
• Dimers and trimers of linoleic acid are commercially available from Oleon Chemicals under the tradename Radiacid and from Arizona Chemicals under the tradename Unidyme. Particularly preferred examples of dimers and trimers of linoleic acid are Radiacid 0975 and Radiacid 0980 commercially available from Oleon Chemicals, Belgium, and Unidyme 12 (C 18 dimer) commercially available from Arizona Chemical, USA.
• the lubricating greases of Examples 1 and 2 and Comparative Examples A and B were prepared by the following procedure.
• 50% of the base oil is charged in an autoclave together with 12-hydroxystearic acid, sebacic acid and lithium hydroxide monohydrate and 100ml of water.
• the autoclave is closed and heated up to 145°C.
• the venting valve is opened and steam is released for 30 minutes.
• heating is started up to a temperature of 215°C.
• the autoclave is cooled down with jacket cooling of 1°C/min to reach 165°C.
• the remaining 50% of base oil is charged in the vessel.
• the product is cooled to 80°C and any additives are charged in the vessel. Then the product is homogenized with a triple roll mill.
• Example 1 contains 4% of a specified dimer of an unsaturated C18 fatty acid.
• Example 2 contains 4% of a specified trimer of an unsaturated C18 fatty acid.
• Comparative Example B contains a C18 saturated fatty acid.
• Comparative Example A contains no dimers or trimers of C18 fatty acids. Table 1 Comparative Example A Ex. 1 Ex. 2 Comparative Ex.
• the friction testing of a mass fly wheel can be done with a dynamic torsion test rig. It is necessary to use completely new components for all inner parts of the mass fly wheel which have to be in line with material specification.
• the mass fly wheel is conditioned first in the torsion test rig at various speeds and angles for at least 4 hours to get constant surface condition.
• the mass fly wheel is filled with the grease (of the Examples or Comparative Example) according to the filling guideline of the testing part and then is tested at 120°C temperature, 2000rpm and +/- 30° angle oscillation with 0.25 Hz.
• the friction value of the mass fly wheel corresponds to the torque needed for one complete oscillation cycle.
• the friction coefficient is calculated according to the maximum torque after displacement from each direction at the zero crossing minus the minimum torque redisplacement of each direction at the zero crossing divided by 2.

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