WO2013003394A1 - Lubricating compositions containing polyetheramines - Google Patents

Abstract

Provided are lubricating compositions comprising in admixture at least 40 wt% of a base stock selected from the group consisting of Group I, Group II, Group III, Group IV and Group V base stocks, or any combination thereof, and one or more polyetheramines. Also provided are methods of improving the friction and wear properties of a base stock selected from the group consisting of Group I, Group II, Group III, Group IV and Group V base stocks, or any combination thereof, comprising blending the base stock with one or more polyetheramines, to form a lubricating composition.

Description

LUBRICATING COMPOSITIONS CONTAINING

POLYETHERAMINES

FIELD

[0001] The present disclosure relates to lubricating compositions containing polyetheramin.es and optionally one or more additives, and methods for improving the performance properties of lubricating compositions with polyeheramines.

BACKGROUND

[0002] Lubricant fuel/energy efficiency will be an important feature for future automotive engine lubricants and commercial vehicle engine lubricants. For automotive engine lubricant formulations, it is generally preferred to have lower viscosity fluids, e.g., below about 15 cSt at 100°C. Lower viscosity is known to impart lower viscous drag thus offering better energy efficiency or fuel economy. It is also important to have a lubricant formulation with a low friction coefficient. Fluids with low friction coefficients exhibit low frictional loss during lubrication. Low factional loss is important for improved fuel or energy efficiency of formulated lubricants.

[0003J Polyalkylene glycol (PAG) fluids have been employed as lubricant base stocks. PAG fluids possess performance advantages that provide good efficiency, including very low friction/traction for energy efficiency and good lubricity (in hydrodynamie, mix, and boundary lubrication conditions). PAG fluids also have other desirable properties, including high viscosity index (VI), low pour point, and excellent cleanliness. PAG fluids, however, have numerous drawbacks, including lack of miscibility and compatibility with mineral and synthetic hydrocarbon-based lubricants. This has limited their use in conjunction with such base stocks. PAG fluids are also polar and highly soluble in water, which can result in severe corrosion problems. Moreover, the formulation or additive response of PAG fluids can be unpredictable, rendering them difficult to formulate with. [0004] Polyethylene glycol, polypropylene glycol and polybutylene glycol, for example, are PAG fluids that are soluble in water, but very slightly soluble (e.g., less than about 0.1 wt% at 23°C) in mineral and synthetic hydrocarbon-based base stocks. Each of these PAG fluids contains two OH groups which may contribute to their reduced solubility in non-polar solvents such as hydrocarbon-based base stocks.

[0005] As an exampl e of a PAG, the structure of polyethylene glycol is shown by the following formula:

[0006] References which discuss polyalkylerie glycols and related compounds are: L. Rudnick and R. Shubkin, in Synthetic Lubricants and High-Performance Functional Fluids (2d Ed. 1999), Chapter 6, Polyalkyiene Glycols, pp. 159-193 ("Rudnick"), U.S. 4,973,414, U.S. 5,024,678, U.S. 5,599, 100, U.S. 5,746,933, U.S. 6,087,307, U.S. 2003/0104951 , U.S. 2009/0107035, U.S. 2010/0004151 , U.S. 2010/0093572, EP 355 977, EP 524 783, EP 246 612A, WO 2000/23544, .IP 5415941 1 A, JP 61 166892, JP 6179888, JP 6128580.

[0007] Polyetheramin.es, also referred to as poiyoxyaikyieneamines, are poiyoxyaikyiene derivatives, Polyetheramines have been described in the art as fuel additives useful as detergents. References which discuss polyetheramines and related compounds are: U.S. 4,659,335, U.S. 4,747,851 , U.S. 5,213,585, U.S. 5,433,755, U.S. 5,789,490, U.S. 6,346,128, U.S. 2005/0215441.

[0008] It would be desirable to have mineral and synthetic hydrocarbon-based lubricant compositions that take advantage of the desirable qualities of PAG fluids, including their good f ictional properties, high VI and cleanliness, while overcoming their drawbacks, including the lack of miscibility of PAG fluids with mineral and synthetic hydrocarbon-based lubricants, corrosion due to water solubility, and unpredictable additive response. SUMMARY

One aspect of this invention relates to a lubricating composition, comprising in admixture at least 40 wt% of a base stock selected from the group consisting of Group I, Group II, Group III, Group IV and Group V base stocks, or any combination thereof, and one or more polyetheramines.

[0010] Another aspect of this invention relates to a method of improving the oxidative stability and frietional properties of a base stock selected from the group consisting of Group I, Group II, Group III, Group IV and Group V base stocks, or any combination thereof, comprising blending the base stock with one or more polyetheramines, to form a lubricating composition.

[0011] In one embodiment, the polyetheramines each have a molecular weight of from about 80 up to about 1000.

[0012] In one embodiment, the polyetheramines are present in an amount of from about I wt% up to about 20 wt% of the composition,

[0013] In one embodiment, the base stock of the lubricating composition is a Group IV base stock, or a blend of Group IV base stocks.

[0014] In one embodiment, the kinematic viscosity at 100°C of the lubricating composition is from about 4 cSt up to about 20 cSt.

[0015] In one embodiment, the additive in the lubricating composition is one or more chosen from the group consisting of friction modifiers, antiwear additives, viscosity improvers, detergents, dispersants, antioxidants, pour point depressants, anti-foam agents, demulsifiers, corrosion inhibitors, seal compatibility additives, antirust additives, and co-base stocks.

[0016] In one embodiment, the additive or additives are present in an amount of up to about 20 wt% of the composition. [0017] In one em.bodim.ent, the lubricating composition further comprises a co-base stock.

[0018] In one embodiment, the co-base stock is one or more chosen from the group consisting of esters and alkylated naphthalenes.

[0019] In one embodiment, the polyetheramine in the lubricating composition is JEFFAMINE D-230 or JEFF AMINE D-400, or a combination thereof

DETAILED DESCRIPTION

[0020] It has been discovered that polyetheramines can be used in lubricating compositions to overcome the limited solubility of PAGs and achieve formulated lubricating compositions with superior oxidative stability and fricttonal characteristics. Moreover, additive solubility is maintained.

[ΘΘ21] Examples of such polyetheramines include JEFFA MIN E D-230 and JEFFAMINE D-400, available from Huntsman Corporation (The Woodlands, Texas). These polyetheramines are represented by the formula:

wherein x ~ 2.5 for D-230 and x ~ 6.1 for D-400.

[Θ022] In accordance with the present invention, the polyetheramines can be amine-terminated polyethers such as polyethylene oxide (PEG), polypropylene oxide (PPO) or combination of PEO/PPO copolymers. For example, some of the commercial polyethers include: poly(ethyleneglycol) bis(3~aminopropylether) (mw 1500), poly(propyieneglycol) bis(2-ammopropyl ether) (mw 230), poly(propyieneglyeol) bis(2-aminopropyiether) (mw 400), poiy(propylenegiycol) bis(2-aminopropylether) (mw 2000), poiy(propylenegiycol) bis(2-aminopropylether) (mw 4000), poly(propyleneglycol)-b lock-po ly(ethyleneglyco l)-b lock po ly(propyieneglyeol) bis(2-aminopropylether) (3.5 :8,5, PO:EO) (mw 600), poly(propyleneglycol)-block- poly(ethyleneglycol)-block poly(propy leneglycol) bis(2-aminopropylether) (3.5 : 15.5, PO:EO) (mw 900), poly(propyleneglycol)-block-poly(ethyleneglycol)-block po!y(propyleneg!ycol) bis(2-ammopropy[ether) (3.5 :40.5, PO:EO) (mw 2000), glycerol tris[poly(propyiene glycol), amine terminated] ether (mw 3000 or mw 440), poly(tetrahydrofuran), bis(3-aminopropyl) terminated, and the like.

[ΘΘ23] The chemical structures of examples of polyetheramines are shown below:

[0024J The polyetheramines can be monoamines that are prepared by reaction of a monohydric alcohol initiator with ethylene and/or propylene oxide, followed by conversion of the resulting tenninal hydroxyl group to an amine. These products are produced by Huntsman as JEFF AMINE monoamines (M series).

[0025] The molecular weights of the polyetheramines can be from about 80 up to about 5000, preferably from about 80 up to about 1000.

[0026] A lubricating composition made comprising polyetheramines is prepared by blending or admixing with a base stock, one or more polyetheramines and optionally an additive package comprising an effective amount of at least one additional performance enhancing additive, such as for example but not limited to at least one of a friction modifier, and/or a lubricity agent, and/or an antiwear agent, and/or extreme pressure additives, and/or a viscosity index (VI) improver, and/or a detergent, and/or a dispersant, and/or an antioxidant, and/or a pour point depressant, and/or an antifoamant, and/or a demulsiiier, and/or a corrosion inhibitor, and/or a seal swell control additive, and/or antiseizure agent, and/or dye, and/or metal deactivators, and/or antistaining agent, and/or a co-basestock. Of these, those additives common to most formulated lubricating oils include one or more friction modifiers, antiwear additives, detergents, dispersants, and antioxidants, with other additives being optional depending on the intended use of the oil. An effective amount of one or more additives, or an additive package containing one or more such additives, is added to, blended into or admixed with the base stock to meet one or more formulated product specifications, such as those relating to a lube oil for diesei engines, internal combustion engines, automatic transmissions, turbine or jet engines, as is known. For a review of many commonly used additives see: Klamann in "Lubricants and Related Products" Verlag Chemie, Deerfield Beach, FL: ISBN 0-89573-177-0. Reference is also made to "Lubricant Additives" by M.W. Rotiney, published by Noyes Data Corporation, Parkridge, NJ (1973). Various manufacturers sell such additive packages for adding to a base stock or to a blend of base stocks to form fully formulated lubricating oils for meeting performance specifications required for different applications or intended uses, and the exact identity of the various additives present in an additive package is typically maintained as a trade secret by the manufacturer. However, the chemical nature of the various additives is known to those skilled in the art.

[0027] The lubricating compositions of the present disclosure may use Group I, Group II or Group III base oil stocks, Group IV polyalphaolefm (PAO) base oil stocks, Group V base oil stocks, or any combination thereof. Useful Group I- 1 II, Group IV PAO and Group V base stocks have a Kv₁₀₀ (kinetic viscosity at 1G0°C) of greater than about 2 cSt to about 25 cSt. Groups I, II, III, IV and V are broad categories of base stocks developed and defined by the American Petroleum Institute (API Publication 1509; w w.APLorg) to create guidelines for lubricant base oils. Group J 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%o saturates. Group IV includes polyalphaolefins (PAO). Group V base stocks are base stocks not included in Groups Ϊ-IV. Table 1 summarizes properties of each of these five groups.

TABLE 1 : Base Stock Properties

Saturates Sulfur Viscosity Index

Group I < 90% and/or > 0.03% and > 80 and < 120

Group II > 90% and < 0.03% and > 80 and < 120

Group ΙΠ > 90%» and < 0.03% and > 120

Group IV Polyalphaolefins (PAO)

Group V All other base oil stocks not included in Groups I, II, III, or IV [0028] Manufacturing plants that make Group I base stocks typically use solvents to extract the lower viscosity index (VI) components and increase the VI of the cmde to the desired specifications. These solvents are typically phenol or furfural. Solvent extraction gives a product with less than 90% saturates and more than 300 ppm sulfur. The majority of lube production in the world is in the Group I category.

[0029] Manufacturing plants that make Group II base stocks typically employ hydroprocessing such as hydro cracking or severe hydrotreating to increase the VI of the crude oil to the specifications value. The use of hydroprocessing typically increases the saturate content above 90% and reduces the sulfur below 300 ppm. Approximately 10% of the lube base oil production in the world is in the Group II category, and about 30% of U.S. production is Group II.

[0030] Group III base stocks are usually produced using a three-stage process involving hydro cracking an oil feed stock, such as vacuum gas oil, to remove impurities and to saturate all aromatics which might be present to produce highly paraffinic lube oil stock of very high viscosity index, subjecting the hydrocracked stock to selective catalytic hydrodewaxing which converts normal paraffins into branched paraffins by isomerization followed by hydrofinishing to remove any residual aromatics, sulfur, nitrogen or oxygenates.

[0031] The term Group III stocks as used in the present specification and appended claims also embrace non-conventional or unconventional base stocks and/or base oils which include one or a mixture of base stock(s) and/or base oii(s) derived from: (1) one or more Gas-to-Liquids (GTL) materials; as well as (2) hydrodewaxed, or hydroisomerized/cat (and/or solvent) dewaxed base stock(s) and/or base oil(s) derived from synthetic wax, natural wax or waxy feeds, waxy feeds including feeds such as mineral and/or non-mineral oil waxy feed stocks, for example gas oils, slack waxes (derived from the solvent dewaxing of natural oils, mineral oils or synthetic; e.g., Fischer-Tropsch feed stocks) and waxy stocks such as waxy fuels hydrocracker bottoms, waxy raffiiiate, hydrocrackate, thermal crackates, foots oil or other natural, mineral oil, or even non-petroleum oil derived waxy materials such as waxy materials recovered from coal liquefaction or shale oil, linear or branched hydrocarbyi compounds with carbon number of about 20 or greater, preferably about 30 or greater, and mixtures of such base stocks and/or base oils.

[0032] 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 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 stockfs) include oils boiling in the lube oil boiling range separated/fractionated from GTL materials such as by, for example, distillation or thermal diffusion, and subsequently subjected to well-known catalytic or solvent dewaxing processes to produce lube oils of reduced/low pour point; wax isomerates, comprising, for example, hydroisomerized or isodewaxed synthesized hydrocarbons; hydroisomerized or isodewaxed Fischer-Tropsch ("F-T") material (i.e., hydrocarbons, waxy hydrocarbons, waxes and possible analogous oxygenates); preferably hydroisomerized or isodewaxed F-T hydrocarbons or hydroisomerized or isodewaxed F-T waxes, hydroisomerized or isodewaxed synthesized waxes, or mixtures thereof.

[ΘΘ33] GTL base stockfs) derived from GTL materials, especially, hydroisomerized/isodewaxed F-T material derived base stockfs), and other hydroisomerized/isodewaxed wax derived base stockfs) are characterized typically as having kinematic viscosities at 100°C of from about 2 mm²/s to about 50 mnv7s, preferably from about 3 mm²/s to about 50 rnm7s, more preferably from about 3.5 mm²/s to about 30 mm /s, as exemplified by a GTL base stock derived by the isodewaxing of F-T wax, which has a kinematic viscosity of about 4 mm s at 100°C and a viscosity index of about 130 or greater. The term GTL base oil/base stock and/or wax isomerate base oil/base stock as used herein and in the claims is to be understood as embracing individual fractions of GTL base stock/base oil or wax isomerate base stock/base oil as recovered in the production process, mixtures of two or more GTL base stocks/base oil fractions and/or wax isomerate base stocks/base oil fractions, as well as mixtures of one or two or more low viscosity GTL base stock(s)/base oil fractions) and/or wax isomerate base stock(s)/^'base oil fraction(s) with one, two or more high viscosity GTL base stock(s)/base oil fractio (s) and/or wax isomerate base stock(s) base oil fraction(s) to produce a bi-modal blend wherein the blend exhibits a viscosity within the aforesaid recited range. Reference herein to Kinematic Viscosity refers to a measurement made by ASTM method D445.

[0034 J GTL base stocks derived from GTL materials, especial!)' hydroisonierized/isodewaxed F-T material derived base stock(s), and other hydroisomerized/isodewaxed wax-derived base stock(s), such as wax hydroisomerates/isodewaxates, which can be used as base stock components of this invention are further characterized typically as having pour points of about -5°C or lower, preferably about -10°C or lower, more preferably about -15°€ or lower, still more preferably about -2Q°C or lower, and under some conditions may have advantageous pour points of about -25°C or lower, with useful pour points of about -30°C to about -40°C or lower. If necessary, a separate dewaxing step may be practiced to achieve the desired pour point. References herein to pour point refer to measurement made by ASTM D97 and similar automated versions.

[0035] The GTL base stock(s) derived from GTL materials, especially hydroisomerized/isodevvaxed F-T material derived base stock(s), and other hydroisomerized/isodewaxed wax-derived base stock(s) which are base stock components which can be used in this invention are also characterized typically as having viscosity indices of 80 or greater, preferably 100 or greater, and more preferably 120 or greater. Additionally, in certain particular instances, viscosity index of these base stocks may be preferably 130 or greater, more preferably 135 or greater, and even more preferably 140 or greater. For example, GTL base stock(s) that derive from GTL materials preferably F-T materials especially F-T wax generally have a viscosity index of 130 or greater. References herein to viscosity index refer to ASTM method D2270. [0036] In addition, the GTL base stock(s) are typically highly paraffinic of greater than 90 percent saturates) and may contain mixtures of monocycloparaffms and multicycloparaffms in combination with non-cyclic isoparaffins. The ratio of the naphthenic (i.e., cycloparaffin) content in such combinations varies with the catalyst and temperature used. Further, GTL base stocks 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 obtained by the hydroisomerization/isodewaxing of F-T material, especial ly F-T wax is essentially nil.

[0037 J In a preferred embodiment, the GTL base stock(s) comprises paraffinic materials that consist predominantly of non-cyclic isoparaffins and only minor amounts of cyeloparaffins. These GTL base stock(s) typically comprise paraffinic materials that consist of greater than 60 wt% non-cyclic isoparaffins, preferably greater than 80 w^rt% non-cyclic isoparaffins, more preferably greater than 85 wt% non-cyclic isoparaffins, and most preferably greater than 90 wt% non-cyclic isoparaffins.

[0038 J Useful compositions of GTL base stock(s), hydroisomerized or isodewaxed F-T material derived base stock(s), and wax-derived hydroisomerized/isodewaxed base stock(s), such as wax isomerates/isodewaxates, are recited in U.S. Patent. Nos. 6,080,301; 6,090,989, and 6, 165,949, for example.

[0039] Base stoek(s) derived from waxy feeds, which are also suitable for use as the Group ill stocks in this invention, are paraffinic fluids of lubricating viscosity derived from hydrodewaxed, or hydroisomerized/cat (and/or solvent) dewaxed waxy feed stocks of mineral oil, non-mineral oil, non-petroleum, or natural source origin, e.g. feed stocks such as one or more of gas oils, slack wax, waxy fuels hydrocracker bottoms, hydrocarbon raffinates, natural waxes, hydrocrackates, 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) and/or base oil(s). [0040] 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 auto-refrigerative dewaxing. Solvent dewaxing employs chilled solvent such as methyl ethyl ketone (MEK), methyl isobutvi ketone (MIB ), mixtures of MEK/MIB , mixtures of MEK and toluene, while auto-refrigerative dewaxing employs pressurized, liquefied low boiling hydrocarbons such as propane or butane.

[0041] Slack waxes 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 hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) so as to avoid subsequent poisoning/ deactivation of the hydroisomerization catalyst.

[0042] The process of making the lubricant oil base stocks from wax or waxy stocks, e.g. slack wax, F-T wax or waxy feed, may be characterized as an isomerization process. As previously indicated, if slack waxes are used as the feed, they may need to be subjected to a preliminary hydrotreating step under conditions already well known to those skilled in the art to reduce (to levels that would effectively avoid poisoning or deactivating the isomerization catalyst) or to remove sulfur- and nitrogen-containing compounds which would otherwise deactivate the hydroisomerization or hvdrodewaxing catalyst used in subsequent steps. If F-T waxes are used, such preliminary treatment is not required because such waxes have only trace amounts (less than about 10 ppm, or more typically less than about 5 ppm to nil each) of sulfur and/or nitrogen compound content. However, some hydrodewaxing catalyst feed F-T waxes may benefit from prehydro reatme t for the removal of oxygenates while others may benefit from oxygenates treatment. The hydroisomerization or hydrodewaxing process may be conducted over a combination of catalysts, or over a single catalyst.

[0043] Following any needed hydrodenitrogenation or hydrosulfurization, the hydroprocessing used for the production of base stocks from such waxy feeds may use an amorphous hydrocracking/hydroisomerization catalyst, such as a lube hydrocracking (LHDC) catalysts, for example catalysts containing Co, Mo, Ni, W, Mo, etc., on oxide supports, e.g., alumina, silica, silica/alumina, or a crystalline hydrocracking hydroisomerization catalyst, preferably a zeolitic catalyst.

[0044] Hydrocarbon conversion catalysts useful in the conversion of the n-paraffm waxy feedstocks disclosed herein to form the isoparaffmie hydrocarbon base oil are zeolite catalysts, such as ZSM-5, ZSM-I 1, ZSM-23, ZSM-35, ZSM-12, ZSM-38, ZSM-48, offretite, ferrierite, zeolite beta, zeolite theta, and zeolite alpha, as disclosed in U.S. Patent 4,906,350. These catalysts are used in combination with Group VIII metals, in particular pal ladium or platinum. The Group VIII metals may be incorporated into the zeolite catalysts by conventional techniques, such as ion exchange.

[0045] Conversion of the waxy feed stock may be conducted over a combination of Pt/^'zeolite beta and Pt/ZSM-23 catalysts or over such catalysts used in series in the presence of hydrogen. In another embodiment, the process of producing the lubri cant oil base stocks comprises hydroisomerization and dewaxing over a single catalyst, such as Pt/ZSM-35. In yet another embodiment, the waxy feed can be fed over a catalyst comprising Group VIII metal loaded ZSM-48, preferably Group VIII noble metal loaded ZSM-48, more preferably Pt/ZSM-48 in either one stage or two stages. In any case, useful hydrocarbon base oil products may be obtained. Catalyst ZSM-48 is described in U.S. Patent 5,075,269.

[0046] A dewaxing step, when needed, may be accomplished using one or more of solvent dewaxing, catalytic dewaxing or hydrodewaxing processes or combinations of such processes in any sequence.

[0047] In solvent dewaxing, the hydroisomerate may be contacted with chilled solvents such as acetone, methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK), mixtures of ME/MIB , or mixtures of MEK/toluene and the like, and further chilled to precipitate out the higher pour point material as a waxy solid which is then separated from the solvent-containing lube oil fraction which is the raffmate. The raffmate is typically further chilled in scraped surface chillers to remove more wax solids. Auto-refrigerative dewaxmg using low molecular weight hydrocarbons, such as propane, can also be used in which the hvdroisomerate is mixed with, e.g., liquid propane, at least a portion of which is flashed off to chill down the hvdroisomerate to precipitate out the wax. The wax is separated from the raffinate by filtration, membrane separation or centrifugation. The solvent is then stripped out of the raffinate, which is then fractionated to produce the preferred base stocks useful in the present invention.

[0048] In catalytic dewaxing the hvdroisomerate is reacted wit hydrogen in the presence of a suitable dewaxmg catalyst at conditions effective to lower the pour point of the hvdro somerate. Catalytic dewaxing also converts a portion of the hvdroisomerate to lower boiling materials which are separated from the heavier base stock fraction. This base stock fraction can then be fractionated into two or more base stocks. Separation of the lower boiling material may be accomplished either prior to or during fractionation of the heavy base stock fraction material into the desired base stocks.

[Θ049] Any dewaxmg catalyst which will reduce the pour point of the hydroisomerate and preferably those which provide a large yield of lube oil base stock from the hydroisomerate may be used. These include shape selective molecular sieves which, when combined with at least one catalytic metal component, have been demonstrated as useful for dewaxmg petroleum oil fractions and include, for example, ferrierite, mordenite, ZSM-5, ZS -l l , ZSM-23, ZSM-35, ZSM-22 also known as theta one or TON, and the silicoaluminophosphates known as SAPOs. A dewaxing catalyst which has been found to be unexpectedly particularly effective comprises a noble metal, preferably Pt, composited with H-mordenite. The dewaxing may be accomplished with the catalyst in a fixed, fluid or slurry bed. Typical dewaxing conditions include a temperature in the range of from about 400 to 600°F, a pressure of 500 to 900 psig, H₂ treat rate of 1500 to 3500 SCF/B for flow-through reactors and LHSV of 0.1 to 10, preferably 0.2 to 2.0. The dewaxing is typically conducted to convert no more than 40 wt% and preferably no more than 30 wt% of the hydroisomerate having an initial boiling point in the range of 650 to 750°F to material boiling below its initial boiling point. [0050] Polyalpha olefin (PAO) base stocks may also be used in the present invention. PAOs in general are typically comprised of relatively low molecular weight hydrogenated polymers or oligomers of polyalphaolefms which include, but are not limited to, C₂ to about C₃₂ alphaolefms, with the C₈ to about C₁₆ alphaolefms, such as 1-octene, I-decene, 1-dodecene and the like, being preferred. The preferred polyalphaolefms are poly-l -octene, poly-l -decene and poly-l -dodecene and mixtures thereof and mixed olefin-derived polyolefins.

[0051 j The PAO fluids may be convenientl made by the polymerization of one or a mixture of alphaolefms in the presence of a polymerization catalyst such as the Friedel -Crafts catalyst 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 proprionate. For example, the methods disclosed by U.S. Patent 4,149,178 or U.S. Patent 3,382,291 may be conveniently used herein. Other descriptions of PAO synthesis are found in the following U.S. Patents: 3,742,082; 3,769,363; 3,876,720; 4,239,930; 4,367,352; 4,413,156; 4,434,408; 4,910,355; 4,956,122; and 5,068,487. The dimers of the C _{j 4} to Gig olefins are described in U.S. Patent 4,218,330. PAOs useful in the present invention may have a kinematic viscosity at 100°C from about 1 ,5 to about 5,000 cSt (mm /s). For the purposes of this invention the PAO preferably has a kinematic viscosity at 100°C from about 2 to about 25 cSt (mm Is), from about 2 to about 20 cSt, or from about 2 to about 15 cSt. PAOs are often identified by reference to their approximate kinematic viscosity at 100°C. For example, PAO 6 refers to a PAO with a kinematic viscosity of approximately 6 cSt at 100°C.

[0052] The PAOs useful in the present invention can also be made by metallocene catalysis. The metallocene-catalyzed PAO (mPAO) can be a copolymer made from at least two or more different alphaolefms, or a homo-polymer made from a single aiphaolefin feed employing a metallocene catalyst system.

[Θ053] The metallocene catalyst can be simple metaliocenes, substituted metallocenes or bridged metallocene catalysts activated or promoted by, for instance, methvlalummoxane (MAO) or a non-coordinating anion, such as Ν,Ν-dimethyiamlimurri tetrakis(perfluorophenyl)borate or other equivalent non-coordinating anion. mPAO and methods for producing mPAO employing metaliocene catalysis are described in WO 2007/011832 and U.S. published application 2009/0036725.

[0054] The copolymer mPAO composition is made from at least two alphaolefins of C₃ to €30 range and having monomers randomly distributed in the polymers. It is preferred that the average carbon number is at least 4.1. Advantageously, ethylene and propylene, if present in the feed, are present in the amount of less than 50 wt% individually or preferably less than 50 wt% combined. The copolymers can be isotactic, atactic, syndiotactic polymers or any other form of appropriate taciticity.

[0055] mPAO can also be made from mixed feed Linear Alpha Olefins (LAOs) comprising at least two and up to 26 different linear alphaolefins selected from C3 to C30 linear alphaolefins. The mixed feed LAO can be obtained, for example, from an ethylene growth processing using an aluminum catalyst or a metaliocene catalyst. The growth olefins comprise mostly C₆ to C ₁₈ LAO. LAOs from other processes can also be used,

[0056] The homo-polymer mPAO composition can be made from single alphaolefin chosen from alphaolefins in the C₃ to C₃₀ range, preferably C₃ to C₁₆, most preferably C3 to C 34 or C3 to C₁₂. The homo-polymers can be isotactic, atactic, syndiotactic polymers or any other form of appropriate taciticity. The taciticity can be carefully tailored by the polymerization catalyst and polymerization reaction condition chosen or by the hydrogenation condition chosen.

[0057] The alphaolefin(s) can be chosen also from any component from a conventional LAO production facility or from a refiner}_'. It can be used alone to make homo-polymer or together with another LAO available from a refinery or chemical plant, including propylene, 1-butene, 1-pentene, and the like, or with 1 -hexene or 1-octene made from a dedicated production facility. The alphaolefins also can be chosen from the alphaolefins produced from Fischer-Tropsch synthesis (as reported in U.S. Patent 5,382,739), For example, C₃ to€_½ alphaolefins, more preferably linear alphaolefins, are suitable to make homo-polymers. Other combinations, such as C4- and C ₁₄-LAO, C₆- and C16-LAO, C₈-, C _iC-, C_{2-LAO, or C₈- and C_!4-LAO, C₆~, C _i0-, C_i4-LAO, C₄- and C i2-LA(), etc., are suitable to make copolymers,

[0058] A. feed comprising a mixture of LAOs selected from C₃ to C₃₀ LAOs or a single LAO selected from C₃ to Cie LAO, is contacted with an activated metallocene catalyst under oligomerization conditions to provide a liquid product suitable for use in lubricant components or as functional fluids. A lso embraced are copolymer compositions made from at least two alphaolefins of C₃ to C30 range and having monomers randomly distributed in the polymers. The phrase "at least two alphaolefins" will be understood to mean "at least two different alphaolefins" (and similarly "at least three alphaolefins" means "at least three different alphaolefins", and so forth).

[Θ059] The product obtained is an essentially random liquid copolymer comprising the at least tw^ro alphaolefins. By "essentially random" is meant that one of ordinary skil l in the art would consider the products to be random copolymer. Likewise the term "liquid" wi ll be understood by one of ordinary skill in the art as meaning liquid under ordinary conditions of temperature and pressure, such as ambient temperature and pressure.

[ΘΘ60] The process for producing mPAO employs a catalyst system comprising a metallocene compound (Formula 1 , below) together with an activator such as a non-coordinating anion (NCA) (Formula 2, below) or methylaluminoxane (MAO) 1 1 1 1 (Formula 3, below):

Formula 1

A'

Formula 2

H M

NCA

O

Formula 3

CH₃

MAO

[0061J The term "'catalyst system" is defined herein to mean a catalyst precursor/activator pair, such as a metallocene/activator pair. When "catalyst system" is used to describe such a pair before activation, it means the unactivated catalyst (preeatalyst) together with an activator and, optionally, a co-activator (such as a trialkyl aluminum compound). When it is used to describe such a pair after activation, it means the activated catalyst and the activator or other charge-balancing moiety. Furthermore, this activated "catalyst system" may optionally comprise the co-activator and/or other charge -balancing moiety. Optionally and often, the co-activator, such as trialkyl aluminum compound, is also used as an impurity scavenger.

[0062] The metallocene is selected from one or more compounds according to Formula I above. In Formula I, M is selected from Group 4 transition metals, preferably zirconium (Zr), hafnium (Hf) and titanium (Ti), LI and L2 are independently selected from cyclopentadienyl ("Cp"), indenyl, and fluorenyl, which may be substituted or unsubstituted, and which may be partially hydrogenated. A is an optional bridging group which, if present, can be selected from dialkylsilyl, dialkylmethyl, diphenylsilyl or diphenylmethyl, ethyieiiyl (— CH₂-CH₂), alkylethylenyl (— CR₂-CR₂), where alkyl can be independently Ci to C₁₆ alkyl radical or phenyl, tolyl, xylyl radical and the like, and wherein each of the two X groups, Xa and Xb, are independently selected from halides OR (R is an alkyl group, preferably selected from ( , to C₅ straight or branched chain alkyl groups), hydrogen, C_\ to C₁₆ alkyl or aryl groups, haloalkyl, and the like. Usually relatively more highly substituted metallocenes give higher catalyst productivity and wider product viscosity ranges.

[0063 J The polyalphaolefins preferably have a Bromine number of 1.8 or less as measured by ASTM D1 159, preferably 1.7 or less, preferably 1.6 or less, preferably 1.5 or less, preferably 1.4 or less, preferably 1.3 or less, preferably 1 .2 or less, preferably 1.1 or less, preferably 1.0 or less, preferably 0.5 or less, preferably 0.1 or less. If necessary the polyalphaolefins can be hydrogenated to achieve a low bromine number.

[0064] The mpolyalphaolefiiis (mPAO) described herein may have monomer units represented by Formula 4 in addition to the all regular 1 ,2-conneetion:

where j, k and m are each, independently, 3, 4, 5, 6, 7, 8, 9, 10, 1 1, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21 or 22, n is an integer from 1 to 350 (preferably 1 to 300, preferably 5 to 50) as measured by proton MR.

[0065] Any of the m polyalphaolefins (mPAO) described herein may have an Mvv (weight average molecular weight) of 100,000 or less, preferably between 100 and 80,000, preferably between 250 and 60,000, preferably between 280 and 50,000, preferably between 336 and 40,000 g/mol.

[0066] Any of the mpolyalphaolefins (raPAO) described herein may have a Mn (number average molecular weight) of 50,000 or less, preferably between 200 and 40,000, preferably between 250 and 30,000, preferably between 500 and 20,000 g mol.

[Θ067] Any of the mpolyalphaolefins (mPAO) described herein may have a molecular weight distribution (MWD-Mvv/Mn) of greater than 1 and less than 5, preferably less than 4, preferably less than 3, preferably less than 2.5. The MWD of mPAO is always a function of fluid viscosity. Alternately, any of the polyalphaolefms described herein may have an Mw/Mn of between 1 and 2.5, alternately between 1 and 3.5, depending on fluid viscosity.

[Θ068] Molecular weight distribution (MWD), defined as the ratio of weight-averaged MW to number-averaged MW (= Mw/Mn). can be determined by gel permeation chromatography (GPC) using polystyrene standards, as described in p. 1 15 to 144 , Chapter 6, The Molecular Weight of Polymers in "Principles of Polymer Systems" (by Ferdinand Rodrigues, McGraw-Hill Book, 1970). The GPC solvent was HPLC Grade tetrahydrofuran, uninhibited, with a column temperature of 30°C, a flow rate of 1 ml/min, and a sample concentration of 1 wt%, and the Column Set is a Phenogel 500 A, Linear, 10E6A.

[0069] Any of the m-polyalphaolefms (mPAO) described herein may have a substantially minor portion of a high end tail of the molecular weight distribution. Preferably, the mPAO has not more than 5.0 wt% of polymer having a molecular weight of greater than 45,000 Daltons. Additionally or alternately, the amount of the mPAO that has a molecular weight greater than 45,000 Daltons is not more than 1.5 wt%, or not more than 0.10 wt%. Additionally or alternately, the amount of the mPAO that has a molecular weight greater than 60,000 Daltons is not more than 0.5 wt%, or not more than 0.20 wt%, or not more than 0.1 wt%. The mass fractions at molecular weights of 45,000 and 60,000 can be determined by GPC, as described above. [0070] Any mPAO described herein may have a pour point of less than 0°C (as measured by ASTM D97), preferably less than -10°C, preferably less than -20°C, preferably less than -25°C, preferably less than -30°C, preferably less than -35°C, preferably less than -5Q°C, preferably from -10°C to -80°C, preferably from -15°C to -70°C.

[0071] mPolyalphaolefins (mPAO) made using metallocene catalysis may have a kinematic viscosity at 100°C from about 1 ,5 to about 5,000 cSt (mm s). For the purposes of this invention the mPAO preferably has a kinematic viscosity at ! 00°C from about 2 to about 25 cSt (mm7s), from about 2 to about 20 cSt, or from about 2 to about 15 cSt.

[0072] The lubricating compositions of the present disclosure optionally contain one or more additives, as described below. The use of polyetheramines greatly improves the solubility of additives in lubricating compositions when compared to the solubility of additives when using pofyalk lene glycols (PAGs). The lubricant compositions, however, are not limited by the examples shown herein as illustrations.

Friction Modifiers

[0073] 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 materials). Friction modifiers, also known as friction reducers, or lubricity agents or oiliness agents, and other such agents that change the ability of base oils, 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 particular!)' 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 - 2? friction modifiers may also have low-ash characteristics. Transition metals may include Mo, Sb, Sn, Fe, Cu, Zn, and others. Ligands may include hydrocarbyi derivative of alcohols, polyols, glycerols, partial ester glycerols, thiols, carboxylates, carbamates, thiocarbamates, dithiocarbamates, phosphates, thiophosphates, dithiophosphates, amides, imides, amines, tiiiazoles, thiadiazoles, dithiazoies, diazoles, triazoles, and other polar molecular functional groups containing effective amounts of O, N, S, or P, individually or in combination. In particular, 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 U.S. Patent 5,824,627; U.S. Patent 6,232,276; U.S. Patent 6,153,564; U.S. Patent 6,143,701 ; U.S. Patent 6,1 10,878; U.S. Patent 5,837,657; U.S. Patent 6,010,987; U.S. Patent 5,906,968; U.S. Patent 6,734,150; U.S. Patent 6,730,638; U.S. Patent 6,689,725; U.S. Patent 6,569,820; WO 99/66013; WO 99/47629; WO 98/26030.

[0074] Ashless friction modifiers may include lubricant materials that contain effective amounts of polar groups, for example, hydroxyl-containing hydrocarbyi base oils, glycerides, partial glycerides, glyceride derivatives, and the like. Polar groups in friction modifiers may include hydrocarbyi 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 hydrocarbyi acids, alcohols, amides, esters, hydroxy carboxylates, and the like. In some instances fatty organic acids, fatty amines, and sulfurized fatty acids may be used as suitable friction modifiers.

[0075] 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.

Antiwear and EP Additives

[ΘΘ76] Many lubricating oils require the presence of antiwear and/or extreme pressure (EP) additives in order to provide adequate antiwear protection for the engine. Increasingly specifications for engine oil performance have exhibited a trend for improved antiwear properties of the oil. Antiwear and extreme EP additives perform this role by reducing friction and wear of metal parts.

[0077 J While there are many different types of antiwear additives, for several decades the principal antiwear additive for internal combustion engine crankcase oils is a metal alkylthiophosphate and more particularly a metal dialkyldithiophosphate in which the primary metal constituent is zinc, or zinc dialkyldithiophosphate (ZDDP). ZDDP compounds generally are of the formula Zn[SP(S)(OR )(OR )]₂ where R^* and R" are Ci-Ci8 alkyl groups, preferably C₂-Ci₂ 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.

[0078] However, it is found that the phosphorus from these additives has a deleterious effect on the catalyst in catalytic converters and also on oxygen sensors in automobiles.

[0079] Another way to minimize this effect is to replace some or all of the ZDDP with phosphorus-free antiwear additives.

[0080 J A variety of non-phosphorous additives are also used as antiwear additives. 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 alicyciic oiefinic hydrocarbons containing from about 3 to 30 carbon atoms, preferably 3-20 carbon atoms. The olefmic compounds contain at least one non-aromatic double bond. Such compounds are defined by the formula

R³R⁴C=CR⁵R⁶ where each of R³-R⁶ are independently hydrogen or a hydrocarbon radical. Preferred hydrocarbon radicals are alkyl or alkenyl radicals. Any two of R³~R° may be connected so as to form a cyclic ring. Additional information concerning sulfurized olefins and their preparation can be found in U.S. Patent 4,941,984.

[Θ081] The use of poiysulfides of thiophosphorus acids and thiophosphorus acid esters as lubricant additives is disclosed in U.S. Patents 2,443,264; 2,471 ,115; 2,526,497; and 2,591,577. Addition of phospliorothionyl disulfides as an antiwear, antioxidant, and EP additive is disclosed in U.S. Patent 3,770,854. Use of alkylthiocarbamoyl compounds (bis(dibutyi)thiocarbamoyl, for example) in combination with a molybdenum compound (oxymolybdemim diisopropylphosphorodithioate sulfide, for example) and a phosphorous ester (dibutyl hydrogen phosphite, for example) as antiwear additives in lubricants is disclosed in U.S. Patent 4,501 ,678. U.S. Patent 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 U.S. Patent 5,693,598. Thiocarbamate/molybdenum complexes such as moly-sulfur alkyl dithiocarbamate trimer complex (R=Cg-Cig 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.

[0082] Esters of glycerol may be used as antiwear agents. For example, mono-, di-, and trioleates, mono-palmitates and mono-myristates may be used.

[0083] ZDDP is combined with other compositions that provide antiwear properties. U.S. Patent 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. U.S. Patent 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.

[0084] Preferred antiwear additives include phosphorus and sulfur compounds such as zinc dithiophosphat.es and/or sulfur, nitrogen, boron, molybdenum phosphorodithioates, molybdenum dithiocarbamates and various organo-molybdenum derivatives including heterocyclics, for example dimercaptothiadiazoles, mercaptobenzothiadiazoies, triazines, and the like, alicyciics, 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.

Viscosity Improvers

[0085] Viscosity improvers (also known as Viscosity Index modifiers, and VI improvers) provide lubricants with high and low temperature operability. These additives increase the viscosity of the oil composition at elevated temperatures which increases film thickness, while having limited effect on viscosity at low temperatures.

[0086] Suitable viscosity improvers include high molecular weight hydrocarbons, polyesters and viscosity index improver dispersants that function as both a viscosity index improver and a dispersant. Typical molecular weights of these polymers are between about 1,000 to 1 ,000,000, more typically about 2,000 to 500,000, and even more typically between about 25,000 and 100,000.

[0087] Examples of suitable viscosity improvers are polymers and copolymers of methacrylate, butadiene, olefins, or alkylated styrenes. Polyisobutylene is a commonly used viscosity index improver. Another suitable viscosity index improver is polymethacrylate (copolymers of various chain length alkyl methacrylates, for example), some formulations of which also serve as pour point depressants. Other suitable viscosity index improvers include copolymers of ethylene and propylene, hydro genated block copolymers of styrene and isoprene, and polyacrylates (copolymers of various chain length acrylates, for example). Specific examples include styrene-isoprene or styrene- butadiene based polymers of 50,000 to 200,000 molecular weight,

[Θ088] The amount of viscosity modifier may range from 0.01 to 8 wt%, preferably 0.01 to 4 wt%, more preferably 0.01 to 2 wt% based on active ingredient and depending on the specific viscosity modifier used.

Detergents

[0089] Detergents are common!)' 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, earboxylic acid, phosphorous acid, phenol, or mixtures thereof. The counterfoil is typically an alkaline earth or alkali metal.

[0090] 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. 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). Useful detergents can be neutral, mildly overbased, or highly overbased.

[0091] It is desirable for at least some detergent to be overbased. Overbased detergents help neutralize acidic impurities produced by the combustion process and become entrapped in the oil . Typically, 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 2.5: 1. The resulting detergent is an Τ7 overbased detergent that will typically have a TBN of about 150 or higher, often about 250 to 450 or more. Preferably, the overbasing cation is sodium, calcium, or magnesium. A mixture of detergents of differing TBN can be used in the present invention.

[0092] Preferred detergents include the alkali or alkaline earth metal salts of sulfonates, phenates, carboxylates, phosphates, and salicylates.

[0093] Sulfonates may be prepared from sulfonic acids that are typically obtained by sulfonation of alkyi substituted aromatic hydrocarbons. Hydrocarbon examples include those obtained by alkylating benzene, toluene, xylene, naphthalene, biphenyl and their halogenated derivatives (chlorobenzene, chiorotoiuene, 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.

[Θ094] 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. The book entitled "Lubricant Additives", C.V. Smallheer and R.K. Smith, published by the Lezius-Hiies Co. of Cleveland, Ohio (1967), similarly discloses a number of overbased sulfonates that are useful as dispersants/detergents.

[0095] 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 aikyiphenoi. Useful alkyl groups include straight chain or branched C ₁ -C30 alkyi groups, preferably, C₄-C20. Examples of suitable phenols include isobutylphenol, 2-ethylhexylphenol, nonylphenol, dodecyl phenol, and the like. It should be noted that starting alkylphenols may contain more than one alkyl substiruent that are each independently straight chain or branched. When a non-sulfurized a!ky!pheno! is used, the sulfurized product may be obtained by methods well known in the art. These methods include heating a mixture of aikyiphenoi and sulfurizmg 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.

[0096] 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

where R is a hydrogen atom or an alkyl group having 1 to about 30 carbon atoms, n is an integer from 1 to 4, and M is an alkalme earth metal. Preferred R groups are alkyl chains of at least C_¾ j , preferably C₁₃ 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.

[0097] Hydrocarbyl-substituted salicylic acids may be prepared from phenols by the oibe reaction. See U.S. Patent 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.

[0098] Alkaline earth metal phosphates are also used as detergents. [0099] 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 U.S. Patent 6,034,039 for example.

[00100] Preferred detergents include calcium phenates, calcium sulfonates, calcium salicylates, magnesium phenates, magnesium sulfonates, magnesium salicylates and other related components (including borated detergents). Typically, the total detergent concentration is about 0.01 to about 8.0 wt%, preferably, about 0.1 to 4.0 wt%.

Dispersants

[00101 ] During machinery operation, oil-insoluble oxidation byproducts are produced. Dispersants help keep these byproducts in solution, thus diminishing their deposition on metal surfaces. Dispersants may be ashless or ash-forming in nature. Preferably, the dispersant is ashless. So-called ashless dispersants are organic materials that form substantially no ash upon combustion. For example, non-metal-containing or borated metal-free dispersants are considered ashless. In contrast, metal-containing detergents discussed above form ash upon combustion.

[00102] 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.

[00103] Chemically, many dispersants may be characterized as phenates, sulfonates, sulfurized phenates, salicylates, naphthenates, stearates, carbamates, thiocarbamates, phosphorus derivatives. A particularly useful class of dispersants are the alkenylsuccinic 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. Many examples of this type of dispersant are well known commercially and in the literature. Exemplar}' U.S. patents describing such dispersants are 3,172,892; 3,215,707; 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. Patents 3,036,003; 3,200,107; 3,254,025; 3,275,554; 3,438,757; 3,454,555; 3,565,804; 3,413,347; 3,697,574; 3,725,277; 3,725,480; 3,726,882; 4,454,059; 3,329,658; 3,449,250; 3,519,565; 3,666,730; 3,687,849; 3,702,300; 4,100,082; 5,705,458. 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.

[00104] Hydrocarbyl-substituted succinic acid compounds are popular dispersants. In particular, succminiide, 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 alkyiene amine are particularly useful.

[00105] Succinirnides are formed by the condensation reaction between alkenyl succinic anhydrides and amines. Molar ratios can vary depending on the polyamine. For example, the molar ratio of alkenyl succinic anhydride to ΊΈΡΑ 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.

[00106] Succinate esters are formed by the condensation reaction betw^reen alkenyl succinic anhydrides and alcohols or poiyols. Molar ratios can vary depending on the alcohol or polyol used. For example, the condensation product of an alkenyl succinic anhydride and pentaerythritoi is a useful dispersant.

[0Θ107] Succinate ester amides are formed by condensation reaction between alkenyl succinic anhydrides and aikanol amines. For example, suitable alkanol amines include ethoxylated polyalkylpolyamines, propoxylated polyalkylpolyamines and polyalkenyipoiyamines such as polyethylene polyamines. One example is propoxylated hexamethylenediamine. Representative examples are shown in U.S. Patent 4,426,305. [00108] 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 high!)' borated dispersants. The dispersants can be borated with from about 0.1 to about 5 moles of boron per mole of dispersant reaction product.

[00109] Mannich base dispersants are made from the reaction of alkylphenols, formaldehyde, and amines. See U.S. Patent 4,767,551. 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.

[00110] 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.

[00111] Examples of high molecular weight alkyl-substituted hydroxyaromatic compounds are polypropylphenol, polybutylphenol, and other polyaikylphenois. These polyalkylphenols can be obtained by the aikyiation, in the presence of an alkylating catalyst, such as BF₃, of phenol with high molecular weight polypropylene, polybutylene, and other polyalkylene compounds to give alky! substituents on the benzene ring of phenol having an average 600-100,000 mol ecular weight.

[00112] Examples of HN(R)₂ group-containing reactants are alkylene polyamines, 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 alkalies and their substituted analogs, e.g., ethylamine and diethanol amine; aromatic diamines, e.g., phenyl ene diamine, diamino naphthalenes; heterocyclic amines, e.g., morpholine, pyrrole, pyrrolidine, imidazole, imidazolidine, and piperidine; melamine and their substituted analogs.

[00113] Examples of alky 1 en e polyaraide reactants include ethylenediamine, di ethylene triamine, methylene tetraamine, tetraethylene pentaamine, pentaethylene hexarnme, hexaethylene heptaamine, heptaethylene octaamine, octaethylene nonaarnine, nonaethylene decamine, and decaethyiene undecamme and mixture of such amines having nitrogen contents corresponding to the alkylene polyamines, in the formula H₂N-(Z-NH-)_nH, mentioned before, Z is a divalent ethylene and n is 1 to 10 of the foregoing formula. Corresponding propylene polyamines such as propylene diamine and di-, tri-, tetra-, pentapropylene 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. Thus the alkylene polyamines obtained from the reaction of 2 to 11 moles of ammonia with 1 to 10 moles of dichloro alkanes having 2 to 6 carbon atoms and the chlorines on different carbons are suitable alkylene poiyamine reactants.

[0Θ114] 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 (β-hydroxybutyraldehyde). Formaldehyde or a formaldehyde-yielding reactant is preferred.

[00115] Hydrocarbvl substituted amine ashless dispersant additives are well known to one skilled in the art; see, for example, U.S. Patent Nos. 3,275,554; 3,438,757; 3,565,804; 3,755,433; 3,822,209 and 5,084,197.

[ΘΘ116] Preferred dispersants include borated and non-borated succinimides, including those derivatives from mono-succinimides, bis-succinimides, and/or mixtures of mono- and bis-succinimides, wherem the hydrocarbvl succimmide 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-coupied Mamiich 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%.

Antioxidants

[ΘΘ117] 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, lamann in Lubricants and Related Products, op cit, and U.S. Patents 4,798,684 and 5,084,197, for example.

[00118] 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 aryi 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 C₆+ aikyi groups and the alkylene coupled derivatives of these hindered phenols. Examples of phenolic materials of this type 2-t-butyl-4-heptyl phenol; 2-t-butyl-4-octyl phenol; 2-t-buty!-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-heptyi phenol; and 2-methyl-6-t-butyl-4-dodecyl phenol. Other useful hindered mono- phenolic antioxidants may include for example hindered 2,6-di-alkyi-phenolie proprionic ester derivatives. Bis-phenolic antioxidants may also be advantageously used in combination with the instant invention. Examples of ortho-coupled phenols include: 2,2 ^'-bis(4-heptyl-6-t-buty 1 -phenol); 2,2 ^'-bis(4-octyi-6-t-butyi-phenol); and

2,2^'-bis(4-dodecyl-6-t-butyl-phenol). Para-coupled bisphenois include for example 4,4^'-bis(2,6~di-t-butyl phenol) and 4,4 ^'-methylene-bis(2,6-di-t-butyl phenol).

[00119] Non-phenolic oxidation inhibitors which may be used include aromatic amine antioxidants and these may be used either as such or in combination wit phenolics. Typical examples of non-phenolic antioxidants include: alkylated and non-alkylated aromatic amines such as aromatic monoamines of the formula R⁸R R^!°N where R⁸ is an aliphatic, aromatic or substituted aromatic group, R⁹ is an aromatic or a substituted aromatic group, and R¹ is H, alkyl, aryi or Rⁿ S(0)xR¹ where R^u is an alkylene, alkeiiylene, or aralkylene group, R is a higher alkyl group, or an aikenyi, aryl, or alkaryl group, and x is 0, 1 or 2, The aliphatic group R⁸ 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. Preferably, both R⁸ and R are aromatic or substituted aromatic groups, and the aromatic group may be a fused ring aromatic group such as naphthyl. Aromatic groups R and R may be joined together with other groups such as S.

[00120] 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 naphthyl amines, phenothiazines, imidodibenz ls and di phenyl phenylene diamines. Mixtures of two or more aromatic amines are also useful. Polymeric amine antioxidants can also be used. Particular examples of aromatic amine antioxidants useful in the present invention include: p,p^'-dioctyldiphenylamine; t-octylphenyl-aipha-naphthyiamine; pheiiyi-aiphanaphthyiamine; and p-octylphenyl- alpha-naphthylam in e .

[00121] Sulfurized alkyl phenols and alkali or alkaline earth metal salts thereof also are useful antioxidants.

[00122] 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. Examples of suitable copper antioxidants include copper dihydrocarbyl thio- or dithio-phosphates and copper salts of carboxylic acid (naturally occurring or synthetic). Other suitable copper salts include copper dithiacarbamates, sulphonates, phenates, and acetylacetonates. Basic, neutral, or acidic copper Cu(I) and or Cu(I !) salts derived from alkenyl succinic acids or anhydrides are know to be particularly useful.

[00123] Preferred antioxidants include hindered phenols, ary I amines. 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.

Pour Point Depressants

[00124] Conventional pour point depressants (also known as lube oil flow improvers) may be added to the compositions of the present invention if desired. These 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. Examples of suitable pour point depressants include polymethacrylates, polyacryiates, polyarylamides, condensation products of haloparaffin waxes and aromatic compounds, vinyl carboxylate polymers, and terpolymers of dialkylfumarates, vinyl esters of fatty acids and aliyl vinyl ethers. U.S. Patent 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 0.01 to 5 wt%, preferably about 0.01 to 1.5 wt%.

Anti-Foam Agents

[00125] 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 siioxane, provide antifoam properties. Anti-foam agents are commercially available and may be used in conventional minor amounts along with other additives such as demulsifi.ers; usually the amount of these additives combined is less than 1 percent and often less than 0.1 percent. Corrosion Inhibitors

[Θ0126] 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, U.S. Patent 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 Additives

[ΘΘ127] 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%.

Inhibitors and Antirust Additives

[00128] Antirust additives (or corrosion inhibitors) are additives that protect lubricated metal surfaces against chemical attack by water or other contaminants. A wide variety of these are commercial!)' available; they are referred to in lamami in Lubricants and Related Products, op cit.

[Θ0129] One type of 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. Examples of 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%, preferabl about 0.01 to 1.5 wt%. Co-Basestocks

[Θ013Θ] In lubricating oil compositions of the present invention in which the base stock is a Group I, Group II, Group ΙΠ or Group IV base stock, or combination thereof, the lubricating oil compositions may also include one or more co-base stocks which provide further increased solubility of the polyalkylene glycol mono ethers and additives in the Group I, Group II, Group III and/or Group TV base stock.

[00131] Esters comprise a useful co-basestock. 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 monocarboxylic acids. Esters of the former type include, for example, the esters of dicarboxylic acids such as phthalic acid, succinic acid, alkyl succinic acid, alkenyi succinic acid, maleic acid, azeiaic acid, suberic acid, sebacic acid, fumaric acid, adipic acid, linoleic acid dimer, malonic acid, alkyl malonic acid, alkenyi malonic acid, etc, with a variety of alcohols such as butyl alcohol, hexyl alcohol, dodecyl alcohol, 2-ethylhexyl alcohol, etc. Specific examples of these types of 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.

[00132] 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- 1,3-propanedioI, trimethylol propane, pentaerythritol and dipentaerythritol) with alkanoic acids containing at least about 4 carbon atoms (preferably Cs to C30 acids such as saturated straight chain fatty acids including caprylic acid, capric acid, 1 auric 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).

[00133] 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. [00134] Alkylated naphthalenes are also a useful co-basestock. The alkyl groups on the alkylated naphthalene preferably have from about 6 to 30 carbon atoms, with particular preference to about 12 to 18 carbon atoms. A preferred class of alkylating agents are the olefins with the requisite number of carbon atoms, for example, the hexenes, heptenes, octenes, nonenes, decenes, undecenes, dodecenes. Mixtures of the olefins, e.g. mixtures of C 12-C20 or C₁₄-C₁₈ olefins, are useful. Branched alkylating agents, especially oligomerized olefins such as the trimers, tetramers, pentamers, etc., of light olefins such as ethylene, propylene, the butylenes, etc., are also useful.

Typical Additive Amounts

[00135] When lubricating oil compositions contain one or more of the additives discussed above, the additive(s) are blended into the composition in an amount sufficient for it to perform its intended function. Typical amounts of such additives useful in the present invention are shown in Table 2 below.

[00136] Note that many of the additives are shipped from the manufacturer and used with a certain amount of base oil solvent in the formulation. Accordingly, the weight- amounts in the table below, as well as other amounts mentioned in this text, unless otherwise indicated are directed to the amount of active ingredient (that is the non- solvent portion of the ingredient). The wt% indicated below are based on the total weight of the lubricating oil composition.

T ABLE 2

Typical Amounts of Various Lubricant Oil Components Compound Approximate wt% Approximate wt%

(useful) (preferred)

Friction Modifiers 0.01 - 15 0.01-5

Antiwear Additives 0.01-6 0.01-4

Viscosity Improvers 0.01-8 0.01 -2

Detergents 0.01-8 0.01-4

Dispersants 0.1 -20 0.1-8

Antioxidants 0.01 -5 0.01-1.5

Pour Point Depressants 0.01-5 0.01 -1.5

Anti-foam Agents 0.001-1 0.001-0.1

Corrosion Inhibitors 0.01 -5 0.01-1.5

Co-basestocks 0-50 0-40

Base Stocks Balance Balance

[0Θ137] Lubricating compositions are prepared by blending together or admixing one or more base stocks from the group consisting of Group I, Group II, Group III, Group IV, and Group V base stocks, one or more polyetheramines, and optionally one or more additives.

[00138] The lubricating compositions can be used as automotive engine lubricants and commercial vehicle engine lubricants. The lubricating compositions demonstrate superior performance with regard to oxidative stability and average friction coefficient when compared to similar compositions that do not contain polyetheramines. The lubricating compositions can also be used as industrial lubricants.

[00139] In the lubricating compositions, the base stock can be Group I, Group II. Group III, Group IV, or Group V, or any combination of these base stocks. These base stocks, or combinations of these base stocks can be used in the lubricating compositions in amounts of up to about 99 wt% of the composition, up to about 95 wt% of the composition, up to about 90 wt% of the composition, up to about 80 wt% of the composition, up to about 70 wt% of the composition, up to about 60 wt% of the composition, up to about 50 wt% of the composition, or up to about 40 wt% of the composition. Additionally or alternately, the base stocks can be used in the lubricating compositions in amounts of at least about 40 wt% of the composition, at least about 50 wt% of the composition, at least about 60 wt% of the composition, at least about 70 wt% of the composition, at least about 80 wt% of the composition, at least about 90 wt% of the composition, or at least about 95 wt% of the composition. Further additionally or alternately, the base stocks can be used in the lubricating compositions in amounts of from about 40 wt% of the composition to about 99 wt% of the composition, from about 50 wt% of the composition to about 99 wt% of the composition, from about 60 wt% of the composition to about 99 wt% of the composition, from about 70 wt% of the composi tion to about 99 wt% of the composition, from about 75 wt% of the composi tion to about 99 wt% of the composition, from about 75 wt% of the composition to about 95 wt% of the composition, or from about 75 wt% of the composition to about 85 wt% of the composition.

[00140] In the lubricating compositions, the Group I, Group II, Group III, Group IV and Group V base stocks, or combinations of these base stocks, can have a kinematic viscosity at 100°C of up to about 25 cSt, up to about 20 cSt, up to about 15 cSt, up to about 12 cSt, up to about 10 cSt, up to about 8 cSt, or up to about 6 cSt. Additionally or alternately, the Group I, Group II, Group II I Group IV and Group V base stocks, or combinations of these base stocks, can have a kinematic viscosity at 100°C of at least about 2 cSt, at least about 4 cSt, or at least about 6 cSt. Further additionally or alternately, the Group I, Group II, Group III, Group IV and Group V base stocks, or combinations of these base stocks, can have a kinematic viscosity at 1G0°C of from about 2 cSt to about 25 cSt, from about 2 cSt to about 15 cSt, from about 2 cSt to about 12 cSt, from about 4 cSt to about 10 cSt, or from about 4 cSt to about 8 cSt,

[00141] In the lubricating compositions, the polyetheramines can be used in an amount of up to about 60 wt%, up to about 50 wt% of the composition, up to about 40 wt% of the composition, up to about 30 wt% of the composition, up to about 20 wt% of the composition, up to about 15 wt% of the composition, up to about 10 wt% of the composition, up to about 5 wt% of the composition, or up to about 3 wt% of the composition. Additionally or alternately, the polyetheramines can be used in an amount of from about 0.5 wt%, from about 1 wt% of the composition, from about 2 wt% of the composition, from about 5 wt% of the composition, or from about 10 wt% of the composition. Further additionally or alternately, the polyetheramines can be used in an amount of from about 1 to about 25 wt% of the composition, or from about 1 to about 15 wt% of the composition, or from about 1 to about 5 wt% of the composition, from about 5 to about 25 wt% of the composition, or from about 10 to about 20 wt% of the composition.

[00142] In an embodiment of the lubricating compositions, a friction modifier performance additive is included. Additionally or alternate!)', an antiwear and/or extreme pressure (EP) additive is included in the iubricating composition. In a further embodiment of the lubricating compositions, the additive package is present in an amount of up to about 30 wt% of the composition, up to about 25 wt% of the composition, up to about 20 wt% of the composition, up to about 15 wt% of the composition, up to about 10 wt% of the composition, or up to about 5 wt% of the composition.

[Θ0143] The lubricating compositions have improved factional properties, and, thus, improved efficiency. Preferably, the average friction coefficient of the iubricating compositions is less than about 0.20, less than about 0.18, less than about 0.15, or less than about 0.13.

[00144] Average friction coefficients can be measured by a High Frequency Reciprocating Rig (HFRR) test. The HFRR is manufactured by PCS Instruments and identified as model HFR2 (AutoHFRR). The test equipment and procedure are similar to the ASTM D6079 method except the test oil temperature is raised from 32°C to 195°C at 2°C/minute, 400 g load, 60 Hz frequency, and 0.5 mm stroke length.

[00145] Oxidative stability can be evaluated in a bench oxidation test. In the bench oxidation test a series of test tubes are each filled with 100 g of the lubricating composition and an iron catalyst, and heated to 100°C. Air and nitrogen are bubbled through the lubricating composition in each test tube in alternating intervals, with air at 500 mL/min for 16 hours and then nitrogen at 500 mL/^'min for 8 hours. Kinematic viscosity at 40°C of the composition is measured according to the ASTM D445 standard at approximately daily intervals.

[00146] The kinematic viscosities at 40°C of the lubricating compositions were measured according to the ASTM D445 standard. Preferably, the lubricating compositions have a kinematic viscosity at 40°C of from about 50 cSt to about 110 cSt, or from about 60 cSt to about 100 cSt.

[00147] The kinematic viscosities at 100°C of the lubricating compositions were measured according to the ASTM D445 standard. Preferably, the lubricating compositions have a kinematic viscosity at ! 00°C of up to about 25 cSt, up to about 20 cSt, up to about 16 cSt, or up to about 14 cSt. Additionally or alternately, the lubricating compositions have a kinematic viscosity at 100°C of at least about 2 cSt, at least about 4 cSt, at least about 6 cSt, or at least about 8 cSt, or at least about 10 cSt. Further additionally or alternately, the lubricating compositions have a kinematic viscosity at 100°C of from about 2 cSt to about 25 cSt, from about 2 cSt to about 16 cSt, from about 2 cSt to about 14 cSt, from about 6 cSt to about 16 cSt, or from about 10 cSt to about 14 cSt.

[00148] The invention will now be more particularly described with reference to the following non-limiting Examples.

EXAMPLES

Example 1

[00149] Comparative Oil 1 is a fully formulated commercial 15W40 engine oil. Inventive Oils 1 and 2 were prepared by blending 3 wt% of JEFFAMINE D-230 and JEFF AMINE D-400 (both available from Huntsman Corp.), respectively, with the fully formulated commercial 15W40 oil of Comparative Oil I . [00150] Oxidative stability can be evaluated in a bench oxidation test. In the bench oxidation test a series of test tubes are each filled with 100 g of the lubricating composition and an iron catalyst, and heated to 100°C. Air and nitrogen are bubbled through the lubricating composition in each test tube in alternating intervals, with air at 500 mL/min for 16 hours and then nitrogen at 500 mL/min for 8 hours. Kinematic viscosity at 40°C of the composition is measured according to the ASTM D445 standard at approximately daily intervals.

[00151] The addition of JEFFAMINE D-230 and JEFFAMINE D-400 in the amount of 3 wt% to Comparative Oil 1 increased oxidative stability by 19% and 33%, respectively, at 167 hours. It is expected that these significant increases in stability will extend exponentially with time in this test. The results are shown in Table 3 and in Figure I . No deposits or solubility issues were observed with the addition of JEFFAMiNE D-230 and JEFFAMINE D-400 to the lubricating compositions.

TABLE 3

Example 2

[00152] Comparative Oil 2 is PAO 4, available from Exxon Mobil Corp, Inventive Oils 3, 4 and 5 were prepared by blending PAO 4 with JEFF AMINE D-230, in amounts of I, 2 and 3 wt%, respectively. Inventive Oils 6, 7 and 8 were prepared by blending PAO 4 with JEFFA IX C D-400, in amounts of 1 , 2 and 3 wt%, respectively.

[00153] The Average Friction Coefficients of Comparative Oil 2 and Inventive Oils 3-8 were measured on a High Frequency Reciprocating Rig (HFRR) test. The HFRR is manufactured by PCS Instruments and identified as model HFR2 (AutoHFRR). The test equipment and procedure are similar to the ASTM D6079 method except the test oil temperature is raised from 32°C to 195°C at 2°C/minute, 400 g load, 60 Hz frequency, and 0.5 mm stroke length. [00154] Both JEFF AMINE D-230 and D-400 when added at 1-3 wt% to P AO 4 showed significant reductions in the average friction coefficient of the oil in the HFRR test, as shown in the Table 4. No deposits or solubility issues were observed with the addition of JEFF AMINE D-230 and JEFFAM ΓΝΕ D-400 to the lubricating compositions.

TABLE 4

Example 3

[00155] Comparative Oi l 3 is a fully formulated commercial 5W30 oil. Inventive Oil 9 was prepared by blending the fully formulated commercial 5W30 oil of Comparative Oil 3 with 3 wt% of JEFF AMINE D-230. Inventive Oil 10 was prepared by blending the fully formulated commercial 5W30 oil of Comparative Oil 3 with 3 wt% of JEFFAMINE D-400.

[00156] The Average Friction Coefficients of Comparative Oil 3 and Inventive Oils 9-10 were measured on a High Frequency Reciprocating Rig (H FRR) test. The HFRR is manufactured by PCS Instruments and identified as model HFR2 (AutoHFRR). The test equipment and procedure are similar to the ASTM D6079 method except the test oil temperature is raised from 32°C to 195°C at 2°C/mimite, 400 g load, 60 Hz frequency, and 0.5 mm stroke length.

[00157] Both JEFFAMINE D-230 and D-400 when added to a fully formulated commercial 5W30 oil in the amount of 3 wt% showed reductions in the average friction coefficient, as shown in Table 5. No deposits or solubility issues were observed with the addition of JEFFAMINE D-230 and JEFFAMINE D-400 to the lubricating compositions.

TABLE 5

KV40 KV100 Average Friction

Blend

(cSt) (cSt) Coefficient

Commercial 5W30

Comp. Oil 3 77.72 1 1 .93 0.135

oil

Inventive 3 wt% JEFFAMINE

67.58 10.86 0.125

Oil 9 D-230 in 5W30

inventive 3 wt% JEFFAMINE

71.6 1 1.35 0.120 Oil 10 D-400 in 5W30

Claims

CLAIMS:

1. A lubricating composition, comprising in admixture: at least 40 wt% of a base stock selected from the group consisting of Group I, Group II, Group III, Group IV and Group V base stocks, or any combination thereof; and one or more polyetheramines.

2. The lubricating composition of claim 1, wherein the polyetheramines each have a molecular weight of from about 80 up to about 1000.

3. The lubricating composition of claim 1, wherein the polyetheramines are present in an amount of from about 1 wt% up to about 20 wt% of the composition.

4. The lubricating composition of claim 1, wherein the base stock is a Group IV base stock, or a blend of Group IV base stocks.

5. The lubricating composition of claim 1, wherein the kinematic viscosity at 100°C of the composition is from about 4 cSt up to about 20 cSt.

6. The lubricating composition of claim 1, further comprising one or more additi ves chosen from the group consisting of friction modifiers, antiwear additives, viscosity improvers, detergents, dispersants, antioxidants, pour point depressants, anti- foam agents, demulsifiers, corrosion inhibitors, seal compatibility additives, aritirust additives, and co-base stocks.

7. The lubricating composition of claim 6, wherein the additive or additi ves are present in an amount of up to about 20 wt% of the composition.

8. The lubricating composition of claim 1, further comprising a co-base stock. 9, The lubricating composition of claim 8, wherein the co-base stock is one or more chosen from the group consisting of esters and alkylated naphthalenes.

10, The lubricating composition of claim 1, wherein polyetheramine is JEFF AMINE D-230 or JEFFAMINE D-400, or a combination thereof.

11 , A method of improving the oxidati ve stabi lity and friction al properties of a base stock selected from the group consisting of Group I, Group II, Group III, Group IV and Group V base stocks, or any combination thereof, comprising:

blending the base stock with one or more polyetheramines, to form a lubricating composition,

12 The method of claim 1 1 wherein the polyetheramines each have a molecular weight of from about 80 up to about 1000,

13 The method of claim 11 wherein the polyetheramines are present in an amount of from about 1 wt% up to about 20 wt% of the composition.

14 The method of claim 11 wherein the base stock is a Group IV base stock, or a blend of Group IV base stocks.

15 The method of claim 11 wherein the kinematic viscosity at 100°C of the composition is from about 4 cSt up to about 20 cSt.

16 The method of claim 1 1 further comprising bl ending in one or more additives chosen from the group consisting of friction modifiers, antiwear additives, viscosity improvers, detergents, dispersants, antioxidants, pour point depressants, anti- foam agents, demulsifiers, corrosion inhibitors, seal compatibility additives, antitrust additives, and co-base stocks.

17 The method of claim 1 1 wherein the additive or additives are present in an amount of up to about 20 wt% of the composition. 18, The method of claim 11 further comprising blending in a co-base stock.

19, The method of claim 18, wherein the co-base stock is one or more chosen from the group consisting of esters and alkylated naphthalenes.

20, The method of claim 11 , wherein the polyetheramine is JEFF AMINE D-230 or JEFFAMINE D-400, or a combination thereof.