Classifications

• • 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
  • C10M111/00—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential
  • C10M111/04—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential at least one of them being a macromolecular organic compound
• • 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
  • C10M127/00—Lubricating compositions characterised by the additive being a non- macromolecular hydrocarbon
  • C10M127/06—Alkylated aromatic hydrocarbons
• • 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
  • C10M111/00—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential
  • C10M111/06—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential at least one of them being a compound of the type covered by group C10M109/00
• • 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
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/06—Well-defined aromatic compounds
  • C10M2203/065—Well-defined aromatic compounds 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
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
  • C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen 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
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
  • C10M2203/102—Aliphatic fractions
  • C10M2203/1025—Aliphatic fractions 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
  • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
  • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
  • C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
  • C10M2205/0285—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms 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
  • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
  • C10M2205/17—Fisher Tropsch reaction products
  • C10M2205/173—Fisher Tropsch reaction products 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
  • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
  • C10M2205/22—Alkylation reaction products with aromatic type compounds, e.g. Friedel-crafts
  • C10M2205/223—Alkylation reaction products with aromatic type compounds, e.g. Friedel-crafts 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
  • C10N2020/011—Cloud point
• • 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
  • C10N2020/02—Viscosity; Viscosity index
• • 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
  • C10N2020/071—Branched chain compounds
• • 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
  • C10N2030/02—Pour-point; Viscosity index
• • 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
  • C10N2030/08—Resistance to extreme temperature
• • 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
  • C10N2030/10—Inhibition of oxidation, e.g. anti-oxidants
• • 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
  • C10N2060/00—Chemical after-treatment of the constituents of the lubricating composition
  • C10N2060/02—Reduction, e.g. hydrogenation

Definitions

• the present invention relates to lubricating oils of improved low temperature properties, especially viscometrics, and low pour points, and to a method for improving the low temperature properties, especially viscometrics, and reducing the pour points of gas-to-liquid (GTL) lubricating oils.
• GTL gas-to-liquid
• Lubricating oils and formulated lubricating oils i.e., lubricating oils comprising mixtures of lubricating oil base stocks/base oils with one or more performance additives
• Lubricating oils and formulated lubricating oils used in most lubrication processes must be capable of delivering lubrication performance at low temperatures, be they low startup temperature or sustained low operating temperature.
• lubricating oils having better low temperature properties, especially reduced low temperature viscometrics, are desirable. It is important that these lubricant oils can flow at very low temperature to critical machine or engine parts to provide lubrication functions. This flowability of lube base stock or finished product, as measured by pour point measurement, is one of the critical low temperature properties and can be measured easily by a standard pour point method.
• Base stocks of low pour points are the desirable starting base stocks/base oils for lubricating oils, be they lubricating oils used per se (that is without additives) or lubricating oil compositions (that is, lubricating oils formulated with at least one performance additive), also called formulated lubricating oils.
• the pour point of a lubricating oil is traditionally defined as that temperature at which a quantity of lubricating base stock/base oil, or of formulated lubricating oil does not move from a beaker when the beaker is tilted at angle.
• Pour point can be measured by standard method ASTM D-97 or similar automated versions. Although pour point of a base stock measures the lowest temperature at which the oil still flows, it is also a good indicator for the low temperature properties. Usually, lower pour point indicates better low temperature properties or better low temperature viscometrics.
• Lubricating base stock/base oil pour point is usually a reflection of the wax content of said base stock/base oil.
• Wax is predominantly a linear paraffin which solidifies at low temperature.
• the pour point of lubricating base stock/base oil can be reduced, therefore, by removing wax from the base stock/base oil.
• the pour point of the base stock is usually determined by the viscosity of the fluid at low temperature. At very low temperature when the viscosity of the base stock increases to so high a level that it stops flowing within the D97 test time frame, this temperature is recorded as the pour point even though there is no wax formation in the base stock.
• waxy lube base stock is contacted with a solvent such as methyl ethyl ketone (MEK) and/or methyl isobutyl ketone (MIBK) and/or toluene, etc., the temperature being reduced in the course of the contacting step to precipitate out the wax as a solid.
• MEK methyl ethyl ketone
• MIBK methyl isobutyl ketone
• toluene etc.
• the solid wax is then removed from the cold oil/solvent mixture by decantation, centrifugation or filtration through a filter, the oil/solvent passing through the filter and the wax being deposited on the filter as a filter cake which is subsequently removed from the filter element material such as by scraping.
• the recovered wax is known as slack wax.
• a solvent known as an autorefrigerative solvent can be used.
• Such solvent(s) is/are liquefied propane and/or propylene and/or butane and/or butylene which is/are mixed with the waxy lube oil under pressure, the pressure subsequently being reduced which causes a reduction in temperature of the entire mixture and a precipitation of solid wax which is then separated from the oil, again by, e.g., decantation, centrifugation or filtration.
• Solvent dewaxing constitutes the physical removal of wax from the waxy oil with subsequent recovery of the wax as a separated stream or product.
• Catalytic dewaxing removes wax from waxy oil by the conversion of wax into smaller hydrocarbon materials.
• the substantially linear long chain paraffins (n-paraff ⁇ ns) which constitute the wax are cracked into shorter chain paraffins which have lower pour points or into paraffins which have so short a chain length as to be gases or non- lubricating oil range hydrocarbons.
• dewaxing process which also involves the use of a catalyst, are hydrodewaxing or hydroisomerization. Either is a process whereby linear long chain paraffins or long chain paraffins containing some branching (i.e., isoparaffins) are converted into more heavily branched isoparaffins by rearrangement, i.e., by isomerization accompanied by some limited cracking. In this way the wax is not actually removed from the oil but is converted into another form of paraffins (i.e., into isoparaffins) which have pour points lower than the substantially linear long chain wax paraffins. This type of fluids is sometimes called "chemically modified mineral oils".
• the hydroisomerized lubricating oil may be subjected to a subsequent solvent or catalytic dewaxing step to remove the residual long chain n-paraffins and the only slightly branched iso-paraff ⁇ ns so as to further reduce the pour point.
• PPD pour point depressing
• PPDs are used in low concentrations, usually 0.01 to about 3.0 wt% of the lubricating base stock/base oil.
• PPDs are typically polymeric materials of high molecular weight and include polymethacrylate, polyalkylmethacrylate, alkylated naphthalene, vinyl acetate-fumarate copolymers, polyarylamides, condensation products of haloparaffin waxes and aromatic compounds, vinyl carboxylate polymer, and terpolymers of dialkylfumarates, vinyl esters of fatty acids and allyl vinyl ethers.
• pour point depressants are used because the addition of too much of the pour point depressant can have detrimental effects on the oil being treated, e.g., the pour point can go up or the oil solidifies.
• USP 3,396,114 teaches a dual purpose lubricant comprising a quantity of tricresyl phosphate, a neutral calcium sulfonate, a poly (C 4-2O alkyl) methacrylate viscosity index improver (about 10,000 to 30,000 molecular weight), a hindered phenol antioxidant, about 0.5 to 2.0 volume percent of a paraffin wax alkylated naphthalene lubricating oil pour point depressant, an alkyl ester of a chlorinated fatty acid, an anti foamant and a petroleum lubricating base oil.
• a dual purpose lubricant comprising a quantity of tricresyl phosphate, a neutral calcium sulfonate, a poly (C 4-2O alkyl) methacrylate viscosity index improver (about 10,000 to 30,000 molecular weight), a hindered phenol antioxidant, about 0.5 to 2.0 volume percent of a paraffin wax alkylated naphthalene
• the pour point depressant is a wax alkylated naphthalene which is identified as a well known PPD for lubricating oil, generally prepared by chlorinating paraffin wax and condensing the chlorowax with naphthalene (see also USP 1,815,022 and USP 2,015,748).
• USP 2,671,051 teaches low pour point lubricants made by adding to a waxy hydrocarbon lubricating oil wherein the wax is predominantly normal aliphatic hydrocarbon waxes, a pour point depressant in an amount in the range of 75 to 150% based on the weight of said waxes of at least one extraneous hydrocarbon wax bearing a cyclic end group on an aliphatic hydrocarbon chain, the chain differing from the average normal aliphatic hydrocarbon wax chain length by no more than about 4 carbon atoms.
• the pour point depressant can be at least one extraneous naphthenic wax bearing a naphthenic end group having an aliphatic hydrocarbon side chain or an extraneous aromatic wax bearing an aromatic end group having an aliphatic hydrocarbon side chain, the aromatic end group being a dicyclic aromatic group, e.g., naphthalene.
• the material has a molecular weight varying from about 271 to about 300,000.
• WO 2004/081157 teaches a lubricant composition based on Fischer- Tropsch (F-T) derived base oils having a pour point from -15 to -31 0 C obtained by a catalytic dewaxing step and containing a pour point depressant additive, and 15 wt% or greater of a Detergent Inhibitor (DI) additive package.
• Suitable pour point depressants are alkylated naphthalene, and phenolic polymers, polymethacrylates, maleate/fiimarate copolymer esters, methacrylate vinyl pyrrolidone copolymer or vinyl acetate-fumarate copolymer.
• Preferred amounts used range from 0.1 wt% to preferably not more than 0.3 wt%.
• WO 02/04578 teaches compositions comprising blends of API Group II and/or Group III base stocks and alkylated fused and/or polyfused aromatic compositions, such as alkylated naphthalenes which exhibit excellent additive solvency, thermo-oxidative stability, hydrolytic stability and seal swell characteristics.
• USP 6,071,864 is directed to catalystic methods for the preparation of arylated poly olefins for use as synthetic lubricants.
• the aryl moiety can be benzene, naphthalene, furan, thiophene, anthracene, phenanthrene, etc.
• USP 5,132,478 is directed to alkylaromatic lubricant fluids.
• Aromatic compounds are alkylated with C 2O -Ci 30O olefinic oligomers using an acidic alkylation catalyst to produce alkylated aromatic products exhibiting high viscosity index and low pour point. They are described as also being useful as additives such as dispersants, detergents, VI improvers, extreme pressure/antiwear additives, antioxidants, pour point depressants, emulsifiers, demulsifiers, corrosion inhibitors, anti-rust inhibitors, anti-staining additives, friction modifiers and the like.
• USP 5,602,086 teaches lubricant compositions comprising mixtures of polyalphaolefins and alkylated aromatic fluids.
• the alkyl aromatic can be alkylated naphthalene having a kinematic viscosity at 100 0 C ranging from about 4 mm 2 /s to about 30 mm 2 /s.
• the mixture is characterized by improved oxidation resistance.
• USP 4,714,794 teaches mixture of specific mono-alkylated naphthalenes as synthetic oil having excellent oxidation stability and useful as a thermal medium oil or as the main component of a synthetic lubricating oil.
• the mixture of specific mono-alkylated naphthalenes can be incorporated with mineral oils and/or known lubricating oils in amounts which do not impair their high oxidation stability.
• the mineral oils and/or known lubricating oils may be added in amounts up to 75% by weight, preferably up to 50% by weight, more preferably up to 25% by weight.
• Publication No. US 2005/0077209 is directed to a process for producing lubricant base oils with optimized branching.
• the lubricants are characterized as having low pour points and extremely high viscosity indexes.
• the lubricants are produced by hydroisomerization dewaxing of waxy feed using a shape selective intermediate pore size molecular sieve to produce an intermediate oil isomerate in which the extent of branching is less than 7 alkyl branches per 100 carbons and solvent dewaxing the intermediate oil isomerate to produce a lube oil wherein the extent of branching is less than 8 alkyl branches per 100 carbon atoms and less than 20 wt% of the alkyl branches are at the 2 position, the lube base oil having a pour point of less than -8 0 C, a kinematic viscosity at 100 0 C of about 3.2 mm 2 /s or greater, a VI greater than a Target VT as calculated as follows:
• Target VI 22 x In (kinematic viscosity at 100 0 C)
• this base oil can be blended with preferably less than 95 wt% of conventional Group I, Group II and Group III base stocks, isomerized petroleum wax oils, polyalpha olefins, poly internal olefins, diesters, polyol esters, phosphate esters, alkylated aromatics and mixtures thereof.
• Alkylated aromatics are identified as synthetic lubricants produced from the alkylation of aromatics with haloalkanes, alcohols or olefins in the presence of a Lewis or Bionstead acid catalyst.
• Useful examples include alkylated benzene and alkylated naphthalene which have good low temperature properties and may provide improved additive solubility.
• USP 6,627,779 teaches an improved method for preparing a blended lube base oil comprising at least one highly paraffinic Fischer-Tropsch (F-T) lube base stock and at least one base stock composed of alkyl aromatic, alkylcyclo- paraffins or mixtures thereof to improve the yield of lube base oils from F-T facilities.
• the alkyl aromatics, alkylcycloparaffins or mixtures thereof are present in an amount of from about 1 wt% to about 50 wt%.
• the alkylaromatic are alkyl aromatics boiling in the lube oil boiling ranges and are alkyl benzene, alkylnaphthalene, alkyltetralines of alkyl polynuclear aromatics.
• the alkyl aromatic is alkyl benzene.
• Fischer-Tropsch synthesis process product is fractionally distilled to produce a C 20 + fraction, a light aromatics fraction and a light Fischer-Tropsch products fraction containing olefins, alcohols and mixtures thereof.
• the light aromatics fraction is alkylated with the light Fischer-Tropsch product fraction to yield the alkyl aromatics.
• the blended lube base oils are described as having excellent viscosity and viscosity index properties. Only blends with alkyl benzene or alkyl cyclohexane are exemplified. There is no mention about the pour points or low temperature viscometrics for the blends containing alkylbenzene.
• Figure 1 graphically presents pour points of blend fluids vs. wt% alkylnaphthalene fluid (AN), ester, a low pour point alkylbenzene fluid (Ar PAO) and a C 2O -C 24 alkylbenzene (C 2024 AB) prepared according to prior art, all in a 6 cSt GTL base stock (GTL 6).
• This graph demonstrates the effects alkylated naphthalene fluid and the low pour point alkylbenzene (Ar PAO) have on lowering the pour point of GTL base stock.
• a method for reducing the pour point of gas-to-liquids (GTL) lube base stocks/base oils or hydrodewaxed or hydroisomerized/catalytic (or solvent) dewaxed wax derived base stocks/base oil(s) by adding to such base stocks/base oils from about 1 to 95 wt% preferably 5 to 80 wt%, more preferably 5 to 60 wt% of an alkylated aromatic synthetic fluid.
• GTL gas-to-liquids
• said alkylated naphthalene synthetic fluid has a kinematic viscosity at 100 0 C falling in the range from about 1.5 mm 2 /s to about 600 mm 2 /s, preferably from about 2 mm 2 /s to about 300 mm 2 /s, more preferably from about 2 mm /s to about 100 mm /s, a pour point of 0 0 C or less, preferably -15°C or less, more preferably -25°C or less, still more preferably -35°C or less, a viscosity index in the range of from about 0 to 200, preferably about 50 to 150, more preferably about 50 to 145.
• the synthetic alkyl aromatic fluid is alkyl benzene
• said alkyl benzene synthetic fluid has a kinematic viscosity falling in the range from about 1.5 mm 2 /s to 600 mm 2 /s, preferably from about 2 mm 2 /s to about 300 mm 2 /s, more preferably about 2 mm 2 /s to 100 mm 2 /s, a pour point of 0 0 C or less, preferably -15°C or less, more preferably -25°C or less, still more preferably - 35°C or less, most preferably -60 0 C or less, a viscosity index in the range of from about 0 to 200, preferably about 70 to 200, more preferably about 80 to 180.
• KV Kinematic Viscosity
• VI Viscosity Index
• Base stock means a lubricating oil produced by a single manufacturer to a particular specification regardless of feed stock source, manufacturer's location or process used, and identified by a specific identification formula or number or code.
• Base oil is one or a mixture of base stocks meeting the particular oil component requirement of a specific lubricating oil product specification, e.g., specific engine oil, turbine oil, etc., finished product performance requirements.
• GTL Gas-to-liquids
• base stocks/base oils and hydrodewaxed or hydroisomerized/catalytic (and/or solvent) dewaxed wax derived base stock(s)/base oil(s) defined in greater detail below, have many outstanding lubricant properties.
• they are known to be highly paraffinic in nature and non-polar, resulting in their having poor solubility for polar additives used in many high quality, high performance lubricating oil formulations. They also have poor solvency and dispersancy for degradation products or sludges formed in the lubricant over long service times.
• Esters have been used to improve solvency and dispersivity but esters are expensive and have performance deficiencies.
• the alkylated naphthalene used in the present method differs from the alkylated naphthalene pour point depressants disclosed in the prior art.
• the alkylated naphthalenes used in the present invention are alkyl naphthalene fluids having kinematic viscosity at 100 0 C falling in the range of from 1.5 to 600 mm 2 /s and having pour points of 0°C or less and VI in the range of 0 to 200. They are flowable liquids at room temperature.
• n + m 1 to 8, preferably 1 to 6, more preferably 1 to 5, and R is Q- C 30 , preferably CpC 2O linear alkyl group, C 3 -C 30O , preferably C 3 -Ci 00 , more preferably C 3 -C 30 branched alkyl group or mixtures of such groups with the total number of carbons in R m and R n , preferably being at least 4.
• alkyl naphthalenes are mono-, di-, tri-, tetra-, or penta-C 3 alkyl naphthalene, C 4 alkyl naphthalene, C 5 alkylnaphthalene, C 6 alkyl naphthalene, C 8 alkyl naphthalene, C ]0 alkyl naphthalene, C ]2 alkyl naphthalene, Ci 4 alkyl naphthalene, C ]6 alkyl naphthalene, Ci 8 alkyl naphthalene, etc., Ci 0 -Ci 4 mixed alkyl naphthalene, C 6 -C) 8 mixed alkyl naphthalene, or the mono-, di-, tri- , tetra-, or penta C 3 , C 4 , C 5 , C 6 , C 8 , Ci 0 , C 12 , C
• the alkyl group can also be branched alkyl group with Ci 0 to C 300 , e.g., C 24 " C 56 branched alkyl naphthalene, C 24 -C 56 branched alkyl mono-, di-, tri-, tetra- or penta- CpC 4 naphthalene.
• C 24 " C 56 branched alkyl naphthalene C 24 -C 56 branched alkyl mono-, di-, tri-, tetra- or penta- CpC 4 naphthalene.
• These branched alkyl group substituted naphthalenes or branched alkyl group substituted mono-, di-, tri-, tetra- or penta CpC 4 naphthalene can also be used as mixtures with the previously recited materials.
• These branched alkyl group can be prepared from oligomerization of small olefins, such as C 5 to C 24 alpha- or internal-olefins.
• small olefins such as C 5 to C 24 alpha- or internal-olefins.
• the alkyl groups on the naphthalene ring can also be mixtures of the above alkyl groups. Sometimes mixed alkyl groups are advantageous because they provide more improvement of pour points and low temperature fluid properties.
• the fully hydrogenated fluid alkylnaphthalenes can also be used for blending with GTL base stock/base oil, but the alkyl naphthalenes are preferred.
• alkyl naphthalenes are prepared by alkylation of naphthalene or short chain alkyl naphthalene, such as methyl or di-methyl naphthalene, with olefins, alcohols or alkylchlorides of 6 to 24 carbons over acidic catalyst inducing typical Friedel Crafts catalysts.
• Typical Friedel-Crafts catalysts are AlCl 3 , BF 3 , HT, zeolites, amorphous alumniosilicates, acid clays, acidic metal oxides or metal salts, USY, etc.
• naphthalene or mono- or di-substituted short chain alkyl naphthalenes can be derived from any conventional naphthalene-producing process from petroleum, petrochemical process or coal process or source stream.
• Naphthalene-containing feeds can be made from aromaticization of suitable streams available from the F-T process.
• aromatization of olefins or paraffins can produce naphthalene or naphthalene-containing component (DE84- 3414705, US20060138024 Al).
• Many medium or light cycle oils from petroleum refining processes contain significant amounts of naphthalene, substituted naphthalenes or naphthalene derivatives.
• substituted naphthalenes recovered from whatever source, if possessing up to about three alkyl carbons can be used as raw material to produce alkylnaphthalene for this invention.
• alkylated naphtahlenes recovered from whatever source or processing can be used in the present method, provided they possess kinematic viscosities, VI, pour point, etc., as previously recited.
• Suitable alkylated naphthalenes are available commercially from ExxonMobil Chemical Company under the tradename Synesstic AN or from King Industries under the tradename NA-Lube naphthalene-containing fluids.
• alkylated benzene of the following structure with viscosity at 100 0 C of 1.5 to 600 cS, VI of 0 to 200 and pour point of 0 0 C or less, preferably -15°C or less, more preferably -25°C or less, still more preferably -35°C or less, most preferably -60 0 C or less are useful for this invention.
• x 1 to 6, preferably 1 to 5, more preferably 1 to 4.
• the R can be linear C 10 to C 30 alkyl group or a Ci 0 -C 30O branched alkyl group preferably Ci O -Ci O o branched alkyl group, more preferably Ci 5 -C 50 branched alkyl group.
• n is 2 or greater than 2
• one or two of the alkyl group can be small alkyl radical of C] to C 5 alkyl group, preferably C 1 -C 2 alkyl group.
• the other alkyl group or groups can be any combination of linear Ci 0 -C 30 alkyl group, or branched C] 0 and higher up to C 300 alkyl group, preferably Ci 5 -C 50 branched alkyl group.
• These branched large alkyl radicals can be prepared from the oligomerization or polymerization of C 3 to C 20 internal or alpha-olefins or mixture of these olefins.
• the total number of carbons in the alkyl subsitutents ranged from Cj 0 to C 30 O- Preferred alkyl benzene fluids can be prepared according to USP 6,071,864 or USP 6,491,809 or EP 0,168,534.
• alkylated benzene is preferably prepared by the method comprising the steps of:
• An ⁇ -olefin or internal olefins is oligomerized in the presence of promoted catalyst to give predominantly olefin dimer and higher oligomers. Once the reaction has gone to completion, an aromatic composition containing one or more aromatic compounds is reacted with the oligomers, in the presence of the same catalyst, to give alkylated aromatic lube base stocks in high yield.
• the ⁇ -olefin has from 6 to about 20 carbon atoms. In more preferred embodiments, the ⁇ -olefin has from about 8 to about 16 carbon atoms. In especially preferred embodiments the ⁇ -olefin has from about 8 to about 14 carbon atoms.
• one or more ⁇ -olefms are oligomerized to form predominantly olefin dimer, with some trimer or higher oligomers.
• the olefin dimer has from about 20 to about 36 carbon atoms, more preferably from about 20 to about 28 carbon atoms.
• one or more internal olefins, by themselves or mixed with a-olefins are oligomerized to form oligomers, which can further be alkylated with an aromatic compound.
• the preferred internal olefins starting material are C8 to C30 internal olefins, preferably ClO to C20, more preferably C12 to C18.
• the aromatic moiety is benzene or a short chain (Cj-C 5 alkyl group) or hydroxy, alkoxy, aroxy alkylthio, or arylthio mono or poly substituted benzene, preferably CpC 5 alkyl group mono or poly substituted benzene, more preferably toluene, o-, m- or p-xylene, ethylene benzene, di-ethyl benzene, n- or iso-propyl benzene, di-n- or di-isoparopyl benzene, n-iso or tert-butyl benzene, di- no- or di-iso or di-tert butyl benzene.
• the catalysts used include a Lewis acid catalyst such as BF 3 , AlCl, triflic acid, BCl 3 , AlBr 3 , SnCl 4 , GaCl 3 , an acid clay catalyst, or an acidic zeolite, for example zeolite Beta, USY, Mordenite, Montmorillonite, or other acidic layered, open-structure zeolites, such as MCM-22, MCM-56 or solid superacids, such as sulfated zirconia, and activated Wo x /ZrO 2 .
• the catalyst is BF 3 or AlCl 3 or their promoted versions.
• catalysts such as those described herein are advantageously employed in conjunction with a promoter.
• Suitable promoters for use with the catalysts in the present invention include those known in the art, for example water, alcohols, or esters, or acids.
• MCM-56 is a member of the MCM- 22 group useful in the invention which includes MCM-22, MCM-36, MCM-49 and MCM-56.
• MCM-22 is described in U.S. Pat. No. 4, 954, 325.
• MCM-36 is described in U.S. Pat. No. 5,250,277 and MCM-36 (bound) is described in U.S. Pat. No. 5,292,698.
• MCM-49 is described in U.S. Pat. No. 5,236, 575 and MCM-56 is described in U.S. Pat. No. 5,362,697.
• the catalysts as mixed metal oxide super acids comprise an oxide of a Group IVB metal, preferably zirconia or titania.
• the Group IVB metal oxide is modified with an oxyanion of a Group VIB metal, such as an oxyanion of tungsten, such as tungstate.
• the modification of the Group IVB metal oxide with the oxyanion of the Group VIB metal imparts acid functionality to the material.
• the combination of Group IVB metal oxide with an oxyanion of a Group VIB metal is believed to enter into an actual chemical interaction which, in any event, provides a composition with more acidity than a simple mixture of separately formed Group IVB metal oxide mixed with a separately formed Group VIB metal oxide or oxyanion.
• the acidic solid materials useful as a catalyst are described in U.S. Pat. Nos. 5,510,539 and 5,563,310. These solid materials comprise an oxide of a Group IVB metal, preferably zirconia or titania.
• the Group IVB metal oxide is modified with an oxyanion of a Group VIB metal, such as an oxyanion of tungsten, such as tungstate.
• the modification of the Group IVB metal oxide with the oxyanion of the Group VIB metal imparts acid functionality to the material.
• the modification of a Group IVB metal oxide, particularly, zirconia, with a Group VIB metal oxyanion, particularly tungstate is described in U.S. Pat. No. 5,113,034; in Japanese Kokai Patent Application No.
• a superacid can also be formed when tungstates are reacted with hydroxides or oxides of Zr.
• the resulting tungstate modified zirconia materials are theorized to have an analogous structure to the aforementioned superacids comprising sulfate and zirconium, wherein tungsten atoms replace sulfur atoms in the bidentate structure. It is further suggested that the tungsten oxide combines with zirconium oxide compounds to create superacid sites at the time the tetragonal phase is formed.
• the present catalysts may comprise the bidentate structure suggested in the aforementioned article by Arata and Hino, the particular structure of the catalytically active site in the present Group IVB metal oxide modified with an oxyanion of a Group VIB metal has not yet been confirmed, and it is not intended that this catalyst component should be limited to any particular structure.
• Suitable sources of the Group IVB metal oxide, used for preparing the catalyst include compounds capable of generating such oxides, such as oxychlorides, chlorides, nitrates, oxynitrates, etc., particularly of zirconium or titanium.
• Alkoxides of such metals may also be used as precursors or sources of the Group IVB metal oxides. Examples of such alkoxides include zirconium n- propoxide and titanium i-propoxide.
• These sources of a Group IVB metal oxide, particularly zirconia, may form zirconium hydroxide, i.e., Zr(OH) 4 , or hydrated zirconia as intermediate species upon precipitation from an aqueous medium in the absence of a reactive source of tungstate.
• zirconium hydroxide i.e., Zr(OH) 4
• hydrated zirconia is intended to connote materials comprising zirconium atoms covalently linked to other zirconium atoms via bridging oxygen atoms, i. e., Zr-O-Zr, further comprising available surface hydroxy groups.
• Suitable sources for the oxyanion of the Group VIB metal include, but are not limited to, ammonium metatungstate or metamolybdate, tungsten or molybdenum chloride, tungsten or molybdenum carbonyl, tungstic or molybdic acid and sodium tungstate or molybdate.
• the ratio of aromatic compound to ⁇ -olefin oligomers preferably is from about 0.05:1 to about 20:1. In more preferred embodiments the ratio of aromatic compound to ⁇ -olefin oligomers is from about 0.1 :1 to about 8: 1.
• the methods provide arylated poly ⁇ -olefins in higher yield than the conventional alkylbenzene fluid synthesis, where 2 moles of ⁇ -olefin and one mole of aromatic compound are mixed together with a catalyst.
• Reaction temperatures typically range from about 20 to 100 0 C.
• the alkylbenzene fluids used in this invention have good low temperature properties, including good pour points. Their pour points are usually 0 0 C or less.
• a preferred alkyl methyl benzene fluid and the one used in all experiments was prepared according to procedures described in USP 6,071,864, starting from the oligomerization of a mixture of C 8 , Ci 0 and C ]2 linear alpha olefins, over a promoted BF 3 catalyst to produce a product which is reacted with toluene over the same catalyst at same reaction temperature.
• a dialkylbenzene (DAB) as described in US6491809 can also be used with GTL lube to give similar benefit.
• DAB dialkylbenzene
• These types of DAB can be prepared by repeated alkylation of benzene e.g., alkylation of benzene to give mono- alkylbenzene, followed by further alkylation of this mono-alkylbenzene in the same reactor or in a separate reactor.
• Alkylbenzenes meeting the requirement for this invention can also be obtained from many detergent alkylbenzene processes.
• linear alkylbenzene (LAB) is produced by alkylation of benzene over alkylation catalyst.
• the mono-alkyl LAB is used as raw material for detergent production.
• This detergent LAB process also produces some heavier by-product streams, which contain mixtures of dialkylbenzene and high alkylbenzenes or oligomerized alkylated benzene. These higher fractions often have properties meeting the description of this invention and are suitable to blend with GTL base stocks .
• the conventional C 2O -C 24 alkylbenzene fluids prepared by isomerizing C 2O -C 24 linear alpha-olefins resulting in the rearrangement of the double bond from the alpha to an internal position and then alkylating benzene with such C 20 -C 24 linear olefins (USP 6,627,779), have pour points above 0 0 C. These types of fluids have no effect on GTL pour point or in fact raise the pour point.
• the hydrogenated analogues of the alkylated naphthalene or alkylated benzene described above are also effective pour point depressant fluids for GTL base stocks, and hydrodewaxed or hydroisomerized/catalytic (and/or solvent) dewaxed wax derived base stocks/base oils.
• the alkylated naphthalene or alkylated benzene fluids can provide un-expected improvement of oxidation stability of the blends with GTL fluids. This oxidative stability improvement can be demonstrated by longer RBOT (ASTM D2272 method) or other oxidation test methods.
• the alkylated naphthalene or alkylated benzene fluids can improve the polarity of the blends with GTL fluids.
• This higher polarity of the blend indicates a better solubility of additives and other polar components formed during oil service.
• the blend of GTL with these alkylated aromatic fluids can provide higher level of finished lubricant performance.
• the base stocks and/or base oils employed in the present invention include one or more of a mixture of base stock(s) and/or base oil(s) derived from one or more Gas-to-Liquids (GTL) materials, as well as hydrodewaxed, or hydroisomerized/conventional cat (and/or solvent) dewaxed base stock(s) and/or base oils derived from natural wax or waxy feeds, mineral and or non-mineral oil waxy feed stocks such as slack waxes (derived from the solvent dewaxing of natural oils, mineral oils or synthetic, e.g.
• GTL Gas-to-Liquids
• Fischer-Tropsch feed stocks natural waxes, and waxy stocks such as gas oils, waxy fuels hydrocracker bottoms, waxy raffinate, hydrocrackate, thermal crackates, foots oil or other mineral, mineral oil, or even non-petroleum oil derived waxy materials such as waxy materials received from coal liquefaction or shale oil, linear or branched hydrocarbyl compounds with carbon numbers of about 20 or greater, preferably about 30 or greater, and mixtures of such base stocks and/or base oils.
• Base stock(s) and/or base oil(s) derived from waxy feeds which are also suitable for use in this invention, are paraff ⁇ nic fluids of lubricating viscosity derived from hydrodewaxed, or hydroisomerized/cat (and/or solvent) dewaxed waxy feedstocks of mineral oil, non-mineral oil, non-petroleum, or natural source origin, e.g., feedstocks such as one or more of gas oils, slack wax, waxy fuels hydrocracker bottoms, hydrocarbon raffinates, natural waxes, hyrocrackates, thermal crackates, foots oil, wax from coal liquefaction or from shale oil, or other suitable mineral oil, non-mineral oil, non-petroleum, or natural source derived waxy materials, linear or branched hydrocarbyl compounds with carbon number of about 20 or greater, preferably about 30 or greater, and mixtures of such isomerate/isodewaxate base stock(s
• GTL materials are materials that are derived via one or more synthesis, combination, transformation, rearrangement, and/or degradation/deconstructive processes from gaseous carbon-containing compounds, hydrogen-containing compounds and/or elements as feedstocks such as hydrogen, carbon dioxide, carbon monoxide, water, methane, ethane, ethylene, acetylene, propane, propylene, propyne, butane, butylenes, and butynes.
• GTL base stocks and/or base oils are GTL materials of lubricating viscosity that are generally derived from hydrocarbons, for example waxy synthesized hydrocarbons, that are themselves derived from simpler gaseous carbon-containing compounds, hydrogen-containing compounds and/or elements as feedstocks.
• GTL base stock(s) and/or base oil(s) include oils boiling in the lube oil boiling range (1) separated/fractionated from synthesized GTL materials such as for example, by distillation and subsequently subjected to a final wax processing step which involves either or both of a catalytic dewaxing process, or a solvent dewaxing process, to produce lube oils of reduced/low pour point; (2) synthesized wax isomerates, comprising, for example, hydrodewaxed, or hydroisomerized/followed by cat and/or solvent dewaxed synthesized wax or waxy hydrocarbons; (3) hydrodewaxed, or hydroisomerized/followed by cat and/or solvent dewaxed Fischer-Tropsch (F-T) material (i.e., hydrocarbons, waxy hydrocarbons, waxes and possible analogous oxygenates); preferably hydrodewaxed, or hydroisomerized/followed by cat and/or solvent dewaxing dewaxed F-T
• GTL base stock(s) and/or base oil(s) derived from GTL materials are characterized typically as having kinematic viscosities at 100 0 C of from about 2 mm /s to about 50 mm /s, preferably from about 3 mm /s to about 50 mm /s, more preferably from about 3.5 mm /s to about 30 mm /s (ASTM D445). They are further characterized typically as having pour points of about -5 0 C to about -40 0 C or lower. (ASTM D97) They are also characterized typically as having viscosity indices of about 80 to 140 or greater (ASTM D2270).
• the GTL base stock(s) and/or base oil(s) are typically highly paraffinic (>90% saturates), and may contain mixtures of monocycloparaff ⁇ ns and multicycloparaffins in combination with non-cyclic isoparaffins.
• the ratio of the naphthenic (i.e., cycloparaff ⁇ n) content in such combinations varies with the catalyst and temperature used.
• GTL base stock(s) and/or base oil(s) and hydrodewaxed, or hydroisomerized/cat (and/or solvent) dewaxed base stock(s) and/or base oil(s) typically have very low sulfur and nitrogen content, generally containing less than about 10 ppm, and more typically less than about 5 ppm of each of these elements.
• the sulfur and nitrogen content of GTL base stock(s) and/or base oil(s) obtained from F-T material, especially F-T wax, is essentially nil.
• the absence of phosphorous and aromatics make this material especially suitable for the formulation of low sulfur, sulfated ash, and phosphorus (low SAP) products.
• Base stock(s) and/or base oil(s) derived from waxy feeds which are also suitable for use in this invention, are paraffinic fluids of lubricating viscosity derived from hydrodewaxed, or hydroisomerized/cat (and/or solvent) dewaxed waxy feedstocks of mineral oil, non-mineral oil, non-petroleum, or natural source origin, e.g., feedstocks such as one or more of gas oils, slack wax, waxy fuels hydrocracker bottoms, hydrocarbon raffinates, natural waxes, hyrocrackates, thermal crackates, foots oil, wax from coal liquefaction or from shale oil, or other suitable mineral oil, non-mineral oil, non-petroleum, or natural source derived waxy materials, linear or branched hydrocarbyl compounds with carbon number of about 20 or greater, preferably about 30 or greater, and mixtures of such isomerate/isodewaxate base stock(s)
• Slack wax is the wax recovered from any waxy hydrocarbon oil including synthetic oil such as F-T waxy oil or petroleum oils by solvent or autorefrigerative dewaxing.
• Solvent dewaxing employs chilled solvent such as methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK), mixtures of MEK/MIBK, mixtures of MEK and toluene, while autorefrigerative dewaxing employs pressurized, liquefied low boiling hydrocarbons such as propane or butane.
• Slack wax(es) secured from synthetic waxy oils such as F-T waxy oil will usually have zero or nil sulfur and/or nitrogen containing compound content.
• Slack wax(es) secured from petroleum oils may contain sulfur and nitrogen containing compounds.
• Such heteroatom compounds must be removed by hydrotreating (and not hydrocracking), as for example by hydrodesulfuri- zation (HDS) and hydrodenitrogenation (HDN) so as to avoid subsequent poisoning/deactivation of the hydroisomerization catalyst.
• GTL base stock and/or base oil and/or wax isomerate base stock and/or base oil is to be understood as embracing individual fractions of such materials of wide viscosity range as recovered in the production process, mixtures of two or more of such fractions, as well as mixtures of one or two or more low viscosity fractions with one, two or more higher viscosity fractions to produce a blend wherein the blend exhibits a target kinematic viscosity.
• mixtures of hydrodewaxate, or hydroisomerate/cat (or solvent) dewaxate base stock(s) and/or base oil(s), mixtures of the GTL base stock(s) and/or base oil(s), or mixtures thereof, preferably mixtures of GTL base stock(s) and/or base oil(s), can constitute all or part of the base oil.
• the GTL material, from which the GTL base stock(s) and/or base oil(s) is/are derived is an F-T material (i.e., hydrocarbons, waxy hydrocarbons, wax).
• ZDDP zinc dialkyldithio- phosphate
• ZDDP compounds generally are of the formula Zn[SP(S)(OR 1 )(OR 2 )] 2 where R 1 and R 2 are C 1 -C 18 alkyl groups, preferably C 2 -Ci 2 alkyl groups. These alkyl groups may be straight chain or branched.
• the ZDDP is typically used in amounts of from about 0.4 to 1.4 wt% of the total lube oil composition, although more or less can often be used advantageously.
• Sulfurized olefins are useful as antiwear and EP additives.
• Sulfur- containing olefins can be prepared by sulfurization or various organic materials including aliphatic, arylaliphatic or alicyclic olefinic hydrocarbons containing from about 3 to 30 carbon atoms, preferably 3-20 carbon atoms.
• the olefinic compounds contain at least one non-aromatic double bond. Such compounds are defined by the formula
• R 3 R 4 C CR 5 R 6 where each of R »3 -ticianR6 are independently hydrogen or a hydrocarbon radical.
• Preferred hydrocarbon radicals are alkyl or alkenyl radicals. Any two of R 3 -R 6 may be connected so as to form a cyclic ring. Additional information concerning sulfurized olefins and their preparation can be found in USP 4,941,984.
• alkylthiocarbamoyl compounds bis(dibutyl)thiocarbamoyl, for example
• a molybdenum compound oxymolybdenum diisopropyl- phosphorodithioate sulfide, for example
• a phosphorous ester dibutyl hydrogen phosphite, for example
• USP 4,758,362 discloses use of a carbamate additive to provide improved antiwear and extreme pressure properties.
• the use of thiocarbamate as an antiwear additive is disclosed in USP 5,693,598.
• Thiocarbamate/molybdenum complexes such as moly-sulfur alkyl dithio- carbamate trimer complex alkyl are also useful antiwear agents.
• the use or addition of such materials should be kept to a minimum if the object is to produce low SAP formulations.
• Esters of glycerol may be used as antiwear agents.
• mono-, di-, and tri-oleates, mono-palmitates and mono-myristates may be used.
• ZDDP is combined with other compositions that provide antiwear properties.
• USP 5,034,141 discloses that a combination of a thiodixanthogen compound (octylthiodixanthogen, for example) and a metal thiophosphate (ZDDP, for example) can improve antiwear properties.
• USP 5,034,142 discloses that use of a metal alkyoxyalkylxanthate (nickel ethoxyethylxanthate, for example) and a dixanthogen (diethoxyethyl dixanthogen, for example) in combination with ZDDP improves antiwear properties.
• a metal alkyoxyalkylxanthate nickel ethoxyethylxanthate, for example
• a dixanthogen diethoxyethyl dixanthogen, for example
• Preferred antiwear additives include phosphorus and sulfur compounds such as zinc dithiophosphates and/or sulfur, nitrogen, boron, molybdenum phosphorodithioates, molybdenum dithiocarbamates and various organo- molybdenum derivatives including heterocyclics, for example dimercaptothia- diazoles, mercaptobenzothiadiazoles, triazines, and the like, alicyclics, amines, alcohols, esters, diols, triols, fatty amides and the like can also be used.
• Such additives may be used in an amount of about 0.01 to 6 wt%, preferably about 0.01 to 4 wt%.
• ZDDP-like compounds provide limited hydroperoxide decomposition capability, significantly below that exhibited by compounds disclosed and claimed in this patent and can therefore be eliminated from the formulation or, if retained, kept at a minimal concentration to facilitate production of low SAP formulations.
• Antioxidants retard the oxidative degradation of base oils during service. Such degradation may result in deposits on metal surfaces, the presence of sludge, or a viscosity increase in the lubricant.
• One skilled in the art knows a wide variety of oxidation inhibitors that are useful in lubricating oil compositions. See, Klamann in Lubricants and Related Products, op cite, and U.S. Patents 4,798,684 and 5,084,197, for example, each of which is incorporated by reference herein in its entirety.
• Useful antioxidants include hindered phenols. These phenolic antioxidants may be ashless (metal-free) phenolic compounds or neutral or basic metal salts of certain phenolic compounds. Typical phenolic antioxidant compounds are the hindered phenolics which are the ones which contain a sterically hindered hydroxyl group, and these include those derivatives of dihydroxy aryl compounds in which the hydroxyl groups are in the o- or p-position to each other. Typical phenolic antioxidants include the hindered phenols substituted with C 6 + alkyl groups and the alkylene coupled derivatives of these hindered phenols.
• phenolic materials of this type 2-t-butyl- 4-heptyl phenol; 2-t-butyl-4-octyl phenol; 2-t-butyl-4-dodecyl phenol; 2,6-di-t- butyl-4-heptyl phenol; 2,6-di-t-butyl-4-dodecyl phenol; 2-methyl-6-t-butyl-4- heptyl phenol; and 2-methyl-6-t-butyl-4-dodecyl phenol.
• Other useful hindered mono-phenolic antioxidants may include for example hindered 2,6-di-alkyl- phenolic proprionic ester derivatives.
• Bis-phenolic antioxidants may also be advantageously used in combination with the instant invention.
• ortho-coupled phenols include: 2,2'-bis(4-heptyl-6-t-butyl-phenol); 2,2'-bis(4- octyl-6-t-butyl-phenol); and 2,2'-bis(4-dodecyl-6-t-butyl-phenol).
• Para-coupled bisphenols include for example 4,4'-bis(2,6-di-t-butyl phenol) and 4,4'- methylene-bis(2,6-di-t-butyl phenol).
• Non-phenolic oxidation inhibitors which may be used include aromatic amine antioxidants and these may be used either as such or in combination with phenolics.
• Typical examples of non-phenolic antioxidants include: alkylated and non-alkylated aromatic amines such as aromatic monoamines of the formula R 8 R 9 R 10 N where R 8 is an aliphatic, aromatic or substituted aromatic group, R 9 is an aromatic or a substituted aromatic group, and R 10 is H, alkyl, aryl or R 11 S(O) x R 12 where R 11 is an alkylene, alkenylene, or aralkylene group, R 12 is a higher alkyl group, or an alkenyl, aryl, or alkaryl group, and x is 0, 1 or 2.
• the aliphatic group R 8 may contain from 1 to about 20 carbon atoms, and preferably contains from about 6 to 12 carbon atoms.
• the aliphatic group is a saturated aliphatic group.
• both R 8 and R 9 are aromatic or substituted aromatic groups, and the aromatic group may be a fused ring aromatic group such as
• Aromatic groups R and R may be joined together with other groups such as S.
• Typical aromatic amines antioxidants have alkyl substituent groups of at least about 6 carbon atoms.
• Examples of aliphatic groups include hexyl, heptyl, octyl, nonyl, and decyl. Generally, the aliphatic groups will not contain more than about 14 carbon atoms.
• the general types of amine antioxidants useful in the present compositions include diphenylamines, phenyl naphthylamines, phenothiazines, imidodibenzyls and diphenyl phenylene diamines. Mixtures of two or more aromatic amines are also useful. Polymeric amine antioxidants can also be used.
• aromatic amine antioxidants useful in the present invention include: p,p'-dioctyldiphenylamine; t-octylphenyl-alpha- naphthylamine; phenyl-alphanaphthylamine; and p-octylphenyl-alpha- naphthylamine.
• Sulfurized alkyl phenols and alkali or alkaline earth metal salts thereof also are useful antioxidants.
• Another class of antioxidant used in lubricating oil compositions is oil- soluble copper compounds. Any oil-soluble suitable copper compound may be blended into the lubricating oil.
• suitable copper antioxidants include copper dihydrocarbyl thio- or dithio-phosphates and copper salts of carboxylic acid (naturally occurring or synthetic).
• suitable copper salts include copper dithiacarbamates, sulphonates, phenates, and acetylacetonates.
• Basic, neutral, or acidic copper Cu(I) and or Cu(II) salts derived from alkenyl succinic acids or anhydrides are know to be particularly useful.
• Preferred antioxidants include hindered phenols, arylamines. These antioxidants may be used individually by type or in combination with one another. Such additives may be used in an amount of about 0.01 to 5 wt%, preferably about 0.01 to 1.5 wt%, more preferably zero to less than 1.5 wt%, most preferably zero.
• Detergents are commonly used in lubricating compositions.
• a typical detergent is an anionic material that contains a long chain hydrophobic portion of the molecule and a smaller anionic or oleophobic hydrophilic portion of the molecule.
• the anionic portion of the detergent is typically derived from an organic acid such as a sulfur acid, carboxylic acid, phosphorous acid, phenol, or mixtures thereof.
• the counterion is typically an alkaline earth or alkali metal.
• Salts that contain a substantially stochiometric amount of the metal are ⁇ described as neutral salts and have a total base number (TBN, as measured by ASTM D2896) of from 0 to 80.
• TBN total base number
• Many compositions are overbased, containing large amounts of a metal base that is achieved by reacting an excess of a metal compound (a metal hydroxide or oxide, for example) with an acidic gas (such as carbon dioxide).
• a metal compound a metal hydroxide or oxide, for example
• an acidic gas such as carbon dioxide
• Useful detergents can be neutral, mildly overbased, or highly overbased.
• the overbased material has a ratio of metallic ion to anionic portion of the detergent of about 1.05: 1 to 50: 1 on an equivalent basis. More preferably, the ratio is from about 4:1 to about 25: 1.
• the resulting detergent is an overbased detergent that will typically have a TBN of about 150 or higher, often about 250 to 450 or more.
• the overbasing cation is sodium, calcium, or magnesium.
• a mixture of detergents of differing TBN can be used in the present invention.
• Preferred detergents include the alkali or alkaline earth metal salts of sulfonates, phenates, carboxylates, phosphates, and salicylates.
• Sulfonates may be prepared from sulfonic acids that are typically obtained by sulfonation of alkyl substituted aromatic hydrocarbons.
• Hydrocarbon examples include those obtained by alkylating benzene, toluene, xylene, naphthalene, biphenyl and their halogenated derivatives (chlorobenzene, chlorotoluene, and chloronaphthalene, for example).
• the alkylating agents typically have about 3 to 70 carbon atoms.
• the alkaryl sulfonates typically contain about 9 to about 80 carbon or more carbon atoms, more typically from about 16 to 60 carbon atoms.
• Klamann in Lubricants and Related Products, op cit discloses a number of overbased metal salts of various sulfonic acids which are useful as detergents and dispersants in lubricants.
• Alkaline earth phenates are another useful class of detergent. These detergents can be made by reacting alkaline earth metal hydroxide or oxide (CaO, Ca(OH) 2 , BaO, Ba(OH) 2 , MgO, Mg(OH) 2 , for example) with an alkyl phenol or sulfurized alkylphenol.
• alkyl phenol or sulfurized alkylphenol Useful alkyl groups include straight chain or branched C]-C 30 alkyl groups, preferably, C 4 -C 20 . Examples of suitable phenols include isobutylphenol, 2-ethylhexylphenol, nonylphenol, dodecyl phenol, and the like.
• starting alkylphenols may contain more than one alkyl substituent that are each independently straight chain or branched.
• the sulfurized product may be obtained by methods well known in the art. These methods include heating a mixture of alkylphenol and sulfurizing agent (including elemental sulfur, sulfur halides such as sulfur dichloride, and the like) and then reacting the sulfurized phenol with an alkaline earth metal base.
• Metal salts of carboxylic acids are also useful as detergents. These carboxylic acid detergents may be prepared by reacting a basic metal compound with at least one carboxylic acid and removing free water from the reaction product. These compounds may be overbased to produce the desired TBN level.
• Detergents made from salicylic acid are one preferred class of detergents derived from carboxylic acids.
• Useful salicylates include long chain alkyl salicylates.
• One useful family of compositions is of the formula
• R is a hydrogen atom or an alkyl group having 1 to about 30 carbon atoms
• n is an integer from 1 to 4
• M is an alkaline earth metal.
• Preferred R groups are alkyl chains of at least Cn, preferably Cj 3 or greater. R may be optionally substituted with substituents that do not interfere with the detergent's function.
• M is preferably, calcium, magnesium, or barium. More preferably, M is calcium.
• Hydrocarbyl-substituted salicylic acids may be prepared from phenols by the Kolbe reaction. See USP 3,595,791 for additional information on synthesis of these compounds.
• the metal salts of the hydrocarbyl-substituted salicylic acids may be prepared by double decomposition of a metal salt in a polar solvent such as water or alcohol.
• Alkaline earth metal phosphates are also used as detergents.
• Detergents may be simple detergents or what is known as hybrid or complex detergents. The latter detergents can provide the properties of two detergents without the need to blend separate materials. See USP 6,034,039 for example.
• Preferred detergents include calcium phenates, calcium sulfonates, calcium salicylates, magnesium phenates, magnesium sulfonates, magnesium salicylates and other related components (including borated detergents).
• the total detergent concentration is about 0.01 to about 6.0 wt%, preferably, about 0.1 to 0.4 wt%.
• Dispersants help keep these byproducts in solution, thus diminishing their deposition on metal surfaces.
• Dispersants may be ashless or ash-forming in nature.
• the dispersant is ashless.
• So called ashless dispersants are organic materials that form substantially no ash upon combustion.
• non-metal-containing or borated metal-free dispersants are considered ashless.
• metal-containing detergents discussed above form ash upon combustion.
• Suitable dispersants typically contain a polar group attached to a relatively high molecular weight hydrocarbon chain.
• the polar group typically contains at least one element of nitrogen, oxygen, or phosphorus.
• Typical hydrocarbon chains contain 50 to 400 carbon atoms.
• dispersants may be characterized as phenates, sulfonates, sulfurized phenates, salicylates, naphthenates, stearates, carbamates, thiocarbamates, phosphorus derivatives.
• a particularly useful class of dispersants are the alkenyl succinic derivatives, typically produced by the reaction of a long chain substituted alkenyl succinic compound, usually a substituted succinic anhydride, with a polyhydroxy or polyamino compound.
• the long chain group constituting the oleophilic portion of the molecule which confers solubility in the oil is normally a polyisobutylene group.
• Exemplary U.S. patents describing such dispersants are 3,172,892; 3,2145,707; 3,219,666; 3,316,177; 3,341,542; 3,444,170; 3,454,607; 3,541,012; 3,630,904; 3,632,511 ; 3,787,374 and 4,234,435.
• Other types of dispersant are described in U.S.
• a further description of dispersants may be found, for example, in European Patent Application No. 471 071, to which reference is made for this purpose.
• Hydrocarbyl-substituted succinic acid compounds are popular dispersants.
• succinimide, succinate esters, or succinate ester amides prepared by the reaction of a hydrocarbon-substituted succinic acid compound preferably having at least 50 carbon atoms in the hydrocarbon substituent, with at least one equivalent of an alkylene amine are particularly useful.
• Succinimides are formed by the condensation reaction between alkenyl succinic anhydrides and amines. Molar ratios can vary depending on the poly- amine. For example, the molar ratio of alkenyl succinic anhydride to TEPA can vary from about 1 : 1 to about 5: 1. Representative examples are shown in U.S. Patents 3,087,936; 3,172,892; 3,219,666; 3,272,746; 3,322,670; and 3,652,616, 3,948,800; and Canada Pat. No. 1,094,044.
• Succinate esters are formed by the condensation reaction between alkenyl succinic anhydrides and alcohols or polyols. Molar ratios can vary depending on the alcohol or polyol used. For example, the condensation product of an alkenyl succinic anhydride and pentaerythritol is a useful dispersant.
• Succinate ester amides are formed by condensation reaction between alkenyl succinic anhydrides and alkanol amines.
• suitable alkanol amines include ethoxylated polyalkylpolyamines, propoxylated polyalkylpoly- amines and polyalkenylpolyamines such as polyethylene polyamines.
• propoxylated hexamethylenediamine Representative examples are shown in USP 4,426,305.
• the molecular weight of the alkenyl succinic anhydrides used in the preceding paragraphs will typically range between 800 and 2,500.
• the above products can be post-reacted with various reagents such as sulfur, oxygen, formaldehyde, carboxylic acids such as oleic acid, and boron compounds such as borate esters or highly borated dispersants.
• the dispersants can be borated with from about 0.1 to about 5 moles of boron per mole of dispersant reaction product.
• Mannich base dispersants are made from the reaction of alkylphenols, :: formaldehyde, and amines. See USP 4,767,551, which is incorporated herein by reference. Process aids and catalysts, such as oleic acid and sulfonic acids, can also be part of the reaction mixture. Molecular weights of the alkylphenols range from 800 to 2,500. Representative examples are shown in U.S. Patents 3,697,574; 3,703,536; 3,704,308; 3,751,365; 3,756,953; 3,798,165; and 3,803,039.
• Typical high molecular weight aliphatic acid modified Mannich condensation products useful in this invention can be prepared from high molecular weight alkyl-substituted hydroxyaromatics or HN(R) 2 group- containing reactants.
• Examples of high molecular weight alkyl-substituted hydroxyaromatic compounds are polypropylphenol, polybutylphenol, and other poly alky lphenols.
• polyalkylphenols can be obtained by the alkylation, in the presence of an alkylating catalyst, such as BF 3 , of phenol with high molecular weight polypropylene, polybutylene, and other polyalkylene compounds to give alkyl substituents on the benzene ring of phenol having an average 600-100,000 molecular weight.
• an alkylating catalyst such as BF 3
• HN(R) 2 group-containing reactants are alkylene poly- amines, principally polyethylene polyamines.
• Other representative organic compounds containing at least one HN(R) 2 group suitable for use in the preparation of Mannich condensation products are well known and include the mono- and di-amino alkanes and their substituted analogs, e.g., ethylamine and diethanol amine; aromatic diamines, e.g., phenylene diamine, diamino naphthalenes; heterocyclic amines, e.g., morpholine, pyrrole, pyrrolidine, imidazole, imidazolidine, and piperidine; melamine and their substituted analogs.
• alkylene polyamide reactants include ethylenediamine, diethylene triamine, triethylene tetraamine, tetraethylene pentaamine, penta- ethylene hexamine, hexaethylene heptaamine, heptaethylene octaamine, octaethylene nonaamine, nonaethylene decamine, and decaethylene undecamine and mixture of such amines having nitrogen contents corresponding to the alkylene polyamines, in the formula H 2 N-(Z-NH-) n H, mentioned before, Z is a divalent ethylene and n is 1 to 10 of the foregoing formula.
• propylene polyamines such as propylene diamine and di-, tri-, terra-, penta- propylene tri-, tetra-, penta- and hexaamines are also suitable reactants.
• the alkylene polyamines are usually obtained by the reaction of ammonia and dihalo alkanes, such as dichloro alkanes.
• the alkylene polyamines obtained from the reaction of 2 to 11 moles of ammonia with 1 to 10 moles of dichloroalkanes having 2 to 6 carbon atoms and the chlorines on different carbons are suitable alkylene polyamine reactants.
• Aldehyde reactants useful in the preparation of the high molecular products useful in this invention include the aliphatic aldehydes such as formaldehyde (also as paraformaldehyde and formalin), acetaldehyde and aldol ( ⁇ -hydroxybutyraldehyde). Formaldehyde or a formaldehyde-yielding reactant is preferred.
• Hydrocarbyl substituted amine ashless dispersant additives are well known to one skilled in the art; see, for example, USP Nos. 3,275,554; 3,438,757; 3,565,804; 3,755,433; 3,822,209 and 5,084,197.
• Preferred dispersants include borated and non-borated succinimides, including those derivatives from mono-succinimides, bis-succinimides, and/or mixtures of mono- and bis-succinimides, wherein the hydrocarbyl succinimide is derived from a hydrocarbylene group such as polyisobutylene having a Mn of from about 500 to about 5000 or a mixture of such hydrocarbylene groups.
• Other preferred dispersants include succinic acid-esters and amides, alkylphenol- polyamine-coupled Mannich adducts, their capped derivatives, and other related components. Such additives may be used in an amount of about 0.1 to 20 wt%, preferably about 0.1 to 8 wt%.
• pour point depressants also known as lube oil flow improvers
• pour point depressants may be added to lubricating compositions of the present invention to lower the minimum temperature at which the fluid will flow or can be poured.
• suitable pour point depressants include poly- methacrylates, polyacrylates, polyarylamides, condensation products of haloparaffin waxes and aromatic compounds, vinyl carboxylate polymers, and terpolymers of dialkylfumarates, vinyl esters of fatty acids and allyl vinyl ethers. USP Nos.
• 1,815,022; 2,015,748; 2,191,498; 2,387,501; 2,655, 479; 2,666,746; 2,721,877; 2.721,878; and 3,250,715 describe useful pour point depressants and/or the preparation thereof.
• Such additives may be used in an amount of about 0.00 to 5 wt%, preferably about 0.01 to 1.5 wt%.
• Corrosion inhibitors are used to reduce the degradation of metallic parts that are in contact with the lubricating oil composition.
• Suitable corrosion inhibitors include thiadiazoles. See, for example, USP Nos. 2,719,125; 2,719,126; and 3,087,932.
• Such additives may be used in an amount of about 0.01 to 5 wt%, preferably about 0.01 to 1.5 wt%.
• Seal compatibility agents help to swell elastomeric seals by causing a chemical reaction in the fluid or physical change in the elastomer.
• Suitable seal compatibility agents for lubricating oils include organic phosphates, aromatic esters, aromatic hydrocarbons, esters (butylbenzyl phthalate, for example), and polybutenyl succinic anhydride. Such additives may be used in an amount of about 0.01 to 3 wt%, preferably about 0.01 to 2 wt%.
• Anti-foam agents may advantageously be added to lubricant compositions. These agents retard the formation of stable foams. Silicones and organic polymers are typical anti-foam agents. For example, polysiloxanes, such as silicon oil or polydimethyl siloxane, provide antifoam properties. Anti-foam agents are commercially available and may be used in conventional minor amounts along with other additives such as demulsifiers; usually the amount of these additives combined is less than 1 percent and often less than 0.1 percent. Inhibitors and Antirust Additives
• Antirust additives are additives that protect lubricated metal surfaces against chemical attack by water or other contaminants. A wide variety of these are commercially available; they are referred to in Klamann in Lubricants and Related Products, op cit.
• antirust additive is a polar compound that wets the metal surface preferentially, protecting it with a film of oil.
• Another type of antirust additive absorbs water by incorporating it in a water-in-oil emulsion so that only the oil touches the metal surface.
• Yet another type of antirust additive chemically adheres to the metal to produce a non-reactive surface.
• suitable additives include zinc dithiophosphates, metal phenolates, basic metal sulfonates, fatty acids and amines. Such additives may be used in an amount of about 0.01 to 5 wt%, preferably about 0.01 to 1.5 wt%.
• a friction modifier is any material or materials that can alter the coefficient of friction of a surface lubricated by any lubricant or fluid containing such material(s).
• Friction modifiers also known as friction reducers, or lubricity agents or oiliness agents, and other such agents that change the ability of base oils, formulated lubricant compositions, or functional fluids, to modify the coefficient of friction of a lubricated surface may be effectively used in combination with the base oils or lubricant compositions of the present invention if desired. Friction modifiers that lower the coefficient of friction are particularly advantageous in combination with the base oils and lube compositions of this invention. Friction modifiers may include metal-containing compounds or materials as well as ashless compounds or materials, or mixtures thereof.
• Metal-containing friction modifiers may include metal salts or metal- ligand complexes where the metals may include alkali, alkaline earth, or transition group metals. Such metal-containing friction modifiers may also have low-ash characteristics. Transition metals may include Mo, Sb, Sn, Fe, Cu, Zn, and others.
• Ligands may include hydrocarbyl derivative of alcohols, polyols, glycerols, partial ester glycerols, thiols, carboxylates, carbamates, thiocarba- mates, dithiocarbamates, phosphates, thiophosphates, dithiophosphates, amides, imides, amines, thiazoles, thiadiazoles, dithiazoles, diazoles, triazoles, and other polar molecular functional groups containing effective amounts of O, N, S, or P, individually or in combination.
• Mo-containing compounds can be particularly effective such as for example Mo-dithiocarbamates, Mo(DTC), Mo- dithiophosphates, Mo(DTP), Mo-amines, Mo (Am), Mo-alcoholates, Mo- alcohol-amides, etc. See USP 5,824,627; USP 6,232,276; USP 6,153,564; USP 6,143,701; USP 6,110,878; USP 5,837,657; USP 6,010,987; USP 5,906,968; USP 6,734,150; USP 6,730,638; USP 6,689,725; USP 6,569,820; WO 99/66013; WO 99/47629; WO 98/26030.
• Ashless friction modifiers may have also include lubricant materials that contain effective amounts of polar groups, for example, hydroxyl-containing hydrocarbyl base oils, glycerides, partial glycerides, glyceride derivatives, and the like.
• Polar groups in friction modifiers may include hydrocarbyl groups containing effective amounts of O, N, S, or P, individually or in combination.
• Other friction modifiers that may be particularly effective include, for example, salts (both ash-containing and ashless derivatives) of fatty acids, fatty alcohols, fatty amides, fatty esters, hydroxyl-containing carboxylates, and comparable synthetic long-chain hydrocarbyl acids, alcohols, amides, esters, hydroxy carboxylates, and the like.
• fatty organic acids, fatty amines, and sulfurized fatty acids may be used as suitable friction modifiers.
• Useful concentrations of friction modifiers may range from about 0.01 wt% to 10-15 wt% or more, often with a preferred range of about 0.1 wt% to 5 wt%. Concentrations of molybdenum-containing materials are often described in terms of Mo metal concentration. Advantageous concentrations of Mo may range from about 10 ppm to 3000 ppm or more, and often with a preferred range of about 20-2000 ppm, and in some instances a more preferred range of about 30-1000 ppm. Friction modifiers of all types may be used alone or in mixtures with the materials of this invention. Often mixtures of two or more friction modifiers, or mixtures of friction modifier(s) with alternate surface active material(s), are also desirable.
• Cobasestocks include natural oil, synthetic oils, and other unconventional oils and mixtures thereof and they can be used unrefined, refined, or rerefined (the latter is also known as reclaimed or reprocessed oil).
• Unrefined oils are those obtained directly from a natural, synthetic or unconventional source and used without further purification. These include for example shale oil obtained directly from retorting operations, oils derived from coal, petroleum oil obtained directly from primary distillation, and ester oil obtained directly from an esterification process.
• Refined oils are similar to the oils discussed for unrefined oils except refined oils are subjected to one or more purification or transformation steps to improve at least one lubricating oil property.
• One skilled in the art is familiar with many purification or transformation processes.
• Groups I, II, III, IV and V are broad categories of base oil stocks developed and defined by the American Petroleum Institute (API Publication 1509; www.API.org) to create guidelines for lubricant base oils.
• Group I base stocks generally have a viscosity index of between about 80 to 120 and contain greater than about 0.03% sulfur and less than about 90% saturates.
• Group II base stocks generally have a viscosity index of between about 80 to 120, and contain less than or equal to about 0.03% sulfur and greater than or equal to about 90% saturates.
• Group III stock generally has a viscosity index greater than about 120 and contains less than or equal to about 0.03% sulfur and greater than about 90% saturates.
• Group IV includes polyalphaolefins (PAO).
• Group V base stocks include base stocks not included in Groups I-IV. Table A summarizes properties of each of these five groups.
• Natural oils include animal oils, vegetable oils (castor oil and lard oil, for example), and mineral oils. Animal and vegetable oils possessing favorable thermal oxidative stability can be used. Of the natural oils, mineral oils are preferred. Mineral oils vary widely as to their crude source, for example, as to whether they are paraffinic, naphthenic, or mixed paraffinic-naphthenic. Oils derived from coal or shale are also useful in the present invention. Natural oils vary also as to the method used for their production and purification, for example, their distillation range and whether they are straight run or cracked, hydrorefined, or solvent extracted.
• Synthetic oils include hydrocarbon oils as well as non hydrocarbon oils. Synthetic oils can be derived from processes such as chemical combination (for example, polymerization, oligomerization, condensation, alkylation, acylation, etc.), where materials consisting of smaller, simpler molecular species are built up (i.e., synthesized) into materials consisting of larger, more complex molecular species. Synthetic oils include hydrocarbon oils such as polymerized and interpolymerized olefins (polybutylenes, polypropylenes, polyisobutylene (see: "Polybutenes" J. D. Fotheringham, Synthetic Lubricants and High-Performance Functional Fluids" 2 nd Edition, ed. L. R.
• PAO polyalphaolefin
• C 8 , Cio, C ]2 , C ]4 olefins or mixtures thereof may be utilized. See U.S. Patents 4,956,122; 4,827,064; and 4,827,073.
• the number average molecular weights of the PAO's typically vary from about 250 to about 3000, or higher, and PAO's may be made in viscosities up to about 100 mm 2 /s (100 0 C), or higher. In addition, higher viscosity PAO's are commercially available, and may be made in viscosities up to about 3000 mm 2 /s (100 0 C), or higher.
• the PAO's are typically comprised of relatively low molecular weight hydrogenated polymers or oligomers of alpha- olefins which include, but are not limited to, about C 2 to about C 32 alphaolefins with about C 8 to about C ]6 alphaolefins, such as 1-octene, 1-decene, 1-dodecene and the like, being preferred.
• alpha- olefins include, but are not limited to, about C 2 to about C 32 alphaolefins with about C 8 to about C ]6 alphaolefins, such as 1-octene, 1-decene, 1-dodecene and the like, being preferred.
• the preferred polyalphaolefins are poly- 1-octene, poly- 1-decene and poly- 1-dodecene and mixtures thereof and mixed olefin- derived polyolefins.
• the dimers of higher olefins in the range of about Ci 4 to C] 8 may be used to provide low viscosity base stocks of acceptably low volatility.
• the PAO's may be predominantly trimers and tetramers of the starting olefins, with minor amounts of the higher oligomers, having a viscosity range of about 1.5 to 12 mm 2 /s.
• PAO fluids may be conveniently made by the polymerization of an alpha-olefin in the presence of a polymerization catalyst such as the Friedel- Crafts catalysts including, for example, aluminum trichloride, boron trifluoride or complexes of boron trifluoride with water, alcohols such as ethanol, propanol or butanol, carboxylic acids or esters such as ethyl acetate or ethyl propionate.
• a polymerization catalyst such as the Friedel- Crafts catalysts including, for example, aluminum trichloride, boron trifluoride or complexes of boron trifluoride with water, alcohols such as ethanol, propanol or butanol, carboxylic acids or esters such as ethyl acetate or ethyl propionate.
• a polymerization catalyst such as the Friedel- Crafts catalysts including, for example, aluminum trichloride, boron triflu
• the dimers of the C 14 to C] 8 olefins are described in USP 4,218,330.
• Alkylene oxide polymers and interpolymers and their derivatives containing modified terminal hydroxyl groups obtained by, for example, esterification or etherification are useful synthetic lubricating oils.
• these oils may be obtained by polymerization of ethylene oxide or propylene oxide, the alkyl and aryl ethers of these poly oxy alkylene polymers (methyl-polypropylene glycol ether having an average molecular weight of about 1000, diphenyl ether of polyethylene glycol having a molecular weight of about 500-1000, and the diethyl ether of polypropylene glycol having a molecular weight of about 1000 to 1500, for example) or mono- and poly- carboxylic esters thereof (the acidic acid esters, mixed C 3 . 8 fatty acid esters, or the C] 3 OxO acid diester of tetraethylene glycol, for example).
• Esters comprise a useful base stock. Additive solvency and seal compatibility characteristics may be secured by the use of esters such as the esters of dibasic acids with monoalkanols and the polyol esters of mono- carboxylic acids.
• Esters of the former type include, for example, the esters of dicarboxylic acids such as phthalic acid, succinic acid, alkyl succinic acid, alkenyl succinic acid, maleic acid, azelaic acid, suberic acid, sebacic acid, fumaric acid, adipic acid, linoleic acid dimer, malonic acid, alkyl malonic acid, alkenyl malonic acid, etc., with a variety of alcohols such as butyl alcohol, hexyl alcohol, dodecyl alcohol, 2-ethylhexyl alcohol, etc.
• dicarboxylic acids such as phthalic acid, succinic acid, alkyl succinic acid, alkenyl succinic acid, maleic acid, azelaic acid, suberic acid, sebacic acid, fumaric acid, adipic acid, linoleic acid dimer, malonic acid, alkyl malonic acid, alkenyl malonic acid, etc
• esters include dibutyl adipate, di(2-ethylhexyl) sebacate, di-n-hexyl fumarate, dioctyl sebacate, diisooctyl azelate, diisodecyl azelate, dioctyl phthalate, didecyl phthalate, dieicosyl sebacate, etc.
• Particularly useful synthetic esters are those full or partial esters which are obtained by reacting one or more polyhydric alcohols (preferably the hindered polyols such as the neopentyl polyols e.g. neopentyl glycol, trimethylol ethane, 2-methyl-2-propyl-l,3-propanediol, trimethylol propane, pentaerythritol and dipentaerythritol) with alkanoic acids containing at least about 4 carbon atoms (preferably C 5 to C 30 acids such as saturated straight chain fatty acids including caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachic acid, and behenic acid, or the corresponding branched chain fatty acids or unsaturated fatty acids such as oleic acid).
• polyhydric alcohols preferably the hindered polyols such as the neopentyl polyols
• Suitable synthetic ester components include the esters of trimethylol propane, trimethylol butane, trimethylol ethane, pentaerythritol and/or dipentaerythritol with one or more monocarboxylic acids containing from about 5 to about 10 carbon atoms.
• Silicon-based oils are another class of useful synthetic lubricating oils. These oils include polyalkyl-, polyaryl-, polyalkoxy-, and polyaryloxy-siloxane oils and silicate oils. Examples of suitable silicon-based oils include tetraethyl silicate, tetraisopropyl silicate, tetra-(2-ethylhexyl)silicate, tetra-(4-methylhexyl) silicate, tetra-(p-tert-butylphenyl) silicate, hexyl-(4-methyl-2-pentoxy) disiloxane, poly(methyl) siloxanes, and poly-(methyl-2-methylphenyl) siloxanes.
• esters of phosphorous- containing acids include, for example, tricresyl phosphate, trioctyl phosphate, diethyl ester of decanephosphonic acid.
• Another class of synthetic oils includes polymeric tetrahydrofurans, their derivatives, and the like.
• Other useful fluids of lubricating viscosity include non-conventional or unconventional base stocks that have been processed, preferably catalytically, or synthesized to provide high performance lubrication characteristics.
• Typical amounts of such additives useful in the present invention are shown in Table 1 below.
• Anti-wear Additive 0.01-6 0.01-4
• Anti-foam Agent 0.001-3 0.001-0.15
• Oxidation test was conducted by purging oil sample with air at 325°C for 40 hours in the presence of copper, iron and lead metal. The oxidation stability was measured by the percent of viscosity increase, change of total acid number, sludge rating and amount of lead loss.
• Alkylmethylbenzene was synthesized according to procedures described in USP 6,071,864, starting with the oligomerization of a mixture of C 8 , C 10 and Q 2 linear alpha olefins over a promoted BF3 catalyst to produce a product which is further reacted with toluene (methylbenzene) over the same catalyst at the same reaction temperature as the olefin oligomerization.
• the product was isolated to yield a lube base stock fluid with viscometrics and pour point listed in following table, along with the properties of a Ci 2 alkylbenzene as produced according to Example 7.
• PAO-6 - 58 - 58 - 50 - 47 - 39 As is shown, when the alkylated naphthalene (AN5) was blended with API Group I or Group III base stock, there is no synergistic improvement of the pour point. While the pour point of such blends were decreased, the amount of the decrease is never below the pour point of the AN base stock. When combined with PAO, the AN actually degraded pour point performance. However, when AN was blended with GTL-6 (having a pour point of -21 0 C) the pour point improvements associated with the blends were non-linear (see Figure 1 and Table 3). Data in Table 3 further demonstrated that the oxidative stabilities of the blended oils were also synergistically improved over pure GTL-6. When 5% AN5 was added, the RBOT was improved from 68 minutes to 102 minutes. When 20% AN5 was added, the RBOT was improved to 132 minutes. This further demonstrated the uniqueness of the blends.
• an AN5 was fully hydrogenated in the presence of 800 psi H2 pressure with a 2 wt% nickel on Kieselguhr catalyst for 16 hours to yield a hydrogenated AN5 fluid (an alkyl cycloparaffin fluid).
• This fluid was blended in varying amounts with GTL-6 and the results are reported in Table 6.
• the fully hydrogenated alkycycloparaffin fluid derived from an alkyl naphthalene has the same influence on the pour point of the blend, the pour point of the blend being reduced non-linearly.
• Alkylmethylbenzene fluid (ArPAO) was prepared and combined in various amounts with GTL-6.
• the alkylmethylbenzene was prepared by first oligomerizing a mixture of C 8 , Ci 0 and C] 2 linear alpha olefins to give oligomers over promoted BF3 catalyst.
• the high boiling fraction, > 750°F (398.8°C) was isolated as high quality PAO base stock after hydrogenation at 200 0 C, 600 psi H2 pressure over a standard hydrogenation catalyst, a nickel on Kieselguhr catalyst.
• the lighter oligomers with boiling points below 750 0 F were separated by distillation. This light fraction usually contains olefins with less than 24 carbons.
• the hydrogenated version of the alkylmethylbenzene fluid of Example 5 was prepared by hydrogenation of the fluid using 2 wt% nickel on Kieselguhr catalyst (50 wt% nickel metal content) at 200 0 C, 800 psi H 2 pressure for 8 hours.
• the hydrogenated alkylmethylbenzene fluid was combined in various amounts with GTL-6 and the results are presented in Table 8.
• Example 7 An alkylbenzene fluid was prepared by alkylation of benzene with 1-dodecene over a zeolite MCM22, according to the general procedures as described in US 4962256. The property of this fluid was summarized in Table 1. This fluid was blended with GTL 6 and the blend properties were summarized in following Table 9. Again, these data demonstrated that low pour point alkylaromatic fluids recited in this invention improve the pour point of the blend stock when combined with GTL derived base stocks.
• a C 2 o-C 24 alkyl benzene fluid was prepared according to the teaching of USP 6,627,779. That C 20 -C 24 alkyl benzene was blended with GTL-6 and the pour points of the individual fluids and of various blends were reported in Table 10 and Figure 1.
• Ester 5 despite having a pour point of ⁇ -61 had substantially no effect on the pour point of the GTL-6 at treat levels of 5 and 20 wt% and only lowered the pour point of GTL from -21 down to -33°C at a treat level of 60 wt% of Ester 5, clearly demonstrative of a lack of any significant pour point reducing capacity and no synergistic impact as is the case when alkylated naphthalene is employed.
• a second, added fluid has a low pour point, therefore, does not automatically mean that the addition of such low pour point fluid to a higher pour point fluid will result in a mixture having a pour point significantly lower than that of the high pour point fluid.
• the present results secured using the alkylated naphthalene and alkylbenzene synthetic fluids as disclosed herein are truly surprising and unexpected.

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