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Boron free automotive gear oilRelated Patent Categories: Solid Anti-friction Devices, Materials Therefor, Lubricant Or Separant Compositions For Moving Solid Surfaces, And Miscellaneous Mineral Oil Compositions, Lubricants Or Separants For Moving Solid Surfaces And Miscellaneous Mineral Oil Compositions (e.g., Water Containing, Etc.), Organic Compound Containing Boron, Nitrogen Containing (i.e., Nitrogen And Boron In The Same Compound), The Nitrogen Is In A Heterocyclic Ring, Which Ring Either Appears In The Compound Or Has Been Reacted With A Boron Compound; A Heterocyclic Ring Is One Having As Ring Members Only Carbon And At Least One Hetero Atom Selected From Nitrogen And Chalcogen (i.e., Oxygen, Sulfur, Selenium, Or Tellurium), The Nitrogen Heterocyclic Ring Has Chalcogen Bonded Directly To Ring Carbon Adjacent To Ring Nitrogen (e.g., Succinimide Compounds, Etc.)Boron free automotive gear oil description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070054813, Boron free automotive gear oil. Brief Patent Description - Full Patent Description - Patent Application Claims
RELATED APPLICATIONS [0001] This application is a continuation application of and claims the benefit of priority to U.S. application Ser. No. 10/670,580 filed on Sep. 25, 2003. TECHNICAL FIELD [0002] The present invention is in the field of lubricant additives and lubricant formulations. Specifically, the present invention relates to a boron-free lubricant additive package that is capable of passing tests for which the presence of boron was thought to be essential to passing. BACKGROUND [0003] Historically, boron-containing lubricants have been used to attain satisfactory performance against standard industry tests. Two such industry tests are the ISOT and the L60-1. However, boron imparts certain undesirable properties to the lubricant such as moisture sensitivity and increased price. Thus, it is desirable to have a lubricant that can provide the performance demanded by industry while reducing or eliminating the presence of boron. Recently, a boron-free lubricant additive package has been developed that unexpectedly passes both the ISOT standard test and the L60-1 standard test. SUMMARY [0004] The present disclosure provides a method for lubricating a gear or transmission comprising contacting said gear or transmission with a lubricant composition wherein said lubricant composition has an ISOT score of about 3.0 or lower for varnish on the glass beaker or glass rod and a L-60-1 carbon/varnish (C/V) rating of at least about 7.5 and a L-60-1 sludge rating of at least about 9.4 and wherein said lubricant composition is substantially free of boron and has a total phosphorus content of less than about 500 ppm [0005] The present disclosure also provides a method for providing a boron-free lubricant composition capable of achieving a satisfying score on the ISOT test and the L-60-1 test comprising combining with a base oil, a lubricant additive package comprising a dispersant, and wherein the lubricant composition is substantially free of boron and has a total phosphonis content of less than about 500 ppm. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S) [0006] In accordance with the foregoing summary, the following presents a detailed description of one embodiment of the invention that is currently considered to be the best mode. [0007] We begin with a discussion of the various components employed in certain embodiments of the present invention. Then we present a lubricant additive package of the present invention and an example of a lubricant oil comprising the inventive lubricant additive package. We conclude with a discussion of the L60-1 and ISOT test performance attained by the inventive lubricant additive package. Base Oil [0008] The base oils useful herein include natural lubricating oils, synthetic lubricating oils, and mixtures thereof. Suitable lubricating oils also include basestocks obtained by isomerization of synthetic wax and slack wax, as well as basestocks produced by hydrocracking the aromatic and polar components of the crude. In general, both the natural and synthetic lubricating oils will each have a kinematic viscosity ranging from about 1 to about 40 mm.sup.2/s (cSt) at 100.degree. C., although typical applications will require each of the base oils to have a viscosity ranging from about 1 to about 16 mm.sup.2/s (cSt) at 100.degree. C., preferably 2 to 15 mm.sup.2/s (cSt) at 100.degree. C. Natural lubricating oils include animal oils, vegetable oils (e.g., castor oil and lard oil), petroleum oils. mineral oils, and oils derived from coal or shale. The preferred natural lubricating oil comprises mineral oil. [0009] The mineral oils useful in this invention can include but are not limited to all common mineral oil base stocks. This would include oils that are naphthenic or paraffinic in chemical structure. Oils that are refined by conventional methodology using acid, alkali, and clay or other agents such as aluminum chloride, or be extracted oils produced, for example, by solvent extraction with solvents such as phenol, sulfur dioxide, furfural, dichlorodiethyl ether, etc. They may be hydrotreated or hydrorefined, dewaxed by chilling or catalytic dewaxing processes, or hydrocracked. The mineral oil may be produced from natural crude sources or be composed of isomerized wax materials or residues of other refining processes. In one embodiment, the oil of lubricating viscosity is a hydrotreated, hydrocracked and/or iso-dewaxed mineral oil having a Viscosity Index (VI) of greater than 80, preferably greater than 90; greater than 90 volume % saturates and less than 0.03 wt. % sulfur. [0010] Group II and Group III basestocks are also particularly suitable for use in the present invention, and are typically prepared from conventional feedstocks using a severe hydrogenation step to reduce the aromatic, sulfur and nitrogen content, followed by dewaxing, hydrofinishing, extraction and/or distillation steps to produce the finished base oil. Also useful herein are base oils known as Group III, .ltoreq.0.03 wt. % sulfur, and .gtoreq.90 vol % saturates, viscosity index>120; and Group IV, poly-alpha-olefins. Hydrotreated basestocks and catalytically dewaxed basestocks, because of their low sulfur and aromatics content, generally fall into the Group II and Group III categories. [0011] There is no limitation as to the chemical composition of the various basestocks used in the present invention. For example, the proportions of aromatics, paraffinics, and naphthenics in the various Group I, Group II and Group III oils can vary substantially. The degree of refining and the source of the crude used to produce the oil generally determine this composition. In one embodiment, the base oil comprises a mineral oil having a VI of at least 110. [0012] The lubricating oils may be derived from refined, re-refined oils, or mixtures thereof. Unrefined oils are obtained directly from a natural source or synthetic source (e.g., coal, shale, or tar sands bitumen) without further purification or treatment. Examples of unrefined oils include shale oil obtained directly from a retorting operation, petroleum oil obtained directly from distillation, or an ester oil obtained directly from an esterification process, each of which is then used without further treatment. Refined oils are similar to the unrefined oils except that refined oils have been treated in one or more purification steps to improve one or more properties. Suitable purification techniques include distillation, hydrotreating, dewaxing, solvent extraction, acid or base extraction, filtration, and percolation, all of which are known to those skilled in the art. Re-refined oils are obtained by treating used oils in processes similar to those used to obtain the refined oils. These re-refined oils are also known as reclaimed or reprocessed oils and are often additionally processed by techniques for removal of spent additives and oil breakdown products. [0013] Synthetic lubricating oils include hydrocarbon oils and halo-substituted hydrocarbon oils such as oligomerized, polymerized, and interpolymerized olefins; alkylbenzenes; polyphenyls; and alkylated diphenyl ethers, alkylated diphenyl sulfides, as well as their derivatives, analogs, and homologs thereof, and the like. Preferred synthetic oils are oligomers of .alpha.-olefins, particularly oligomers of 1-decene, having a viscosity ranging from about 1 to about 12, preferably 2 to 8, mm.sup.2/s (cSt) at 100.degree. C. These oligomers are known as poly-.alpha.-olefins or PAOs. [0014] Synthetic lubricating oils also include alkylene oxide polymers, interpolymers, copolymers, and derivatives thereof where the terminal hydroxyl groups have been modified by esterification, etherification, etc. This class of synthetic oils is exemplified by polyoxyalkylene polymers prepared by polymerization of ethylene oxide or propylene oxide; the alkyl and aryl ethers of these polyoxyalkylene polymers (e.g., methyl-polyisopropylene glycol ether having an average molecular weight of 1000, diphenyl ether of polypropylene glycol having a molecular weight of 100-1500); and mono- and poly-carboxylic esters thereof (e.g., the acetic acid esters, mixed C.sub.3-C.sub.8 fatty acid esters, and C.sub.12 oxo acid diester of tetraethylene glycol). [0015] Another suitable class of synthetic lubricating oils comprises the esters of dicarboxylic acids (e.g., phthalic acid, succinic acid, alkyl succinic acids and alkenyl succinic acids, maleic acid, azelaic acid, subric acid, sebasic acid, fumaric acid, adipic acid, linoleic acid dimer, malonic acid, alkylmalonic acids, alkenyl malonic acids, etc.) with a variety of alcohols (e.g.. butyl alcohol, hexyl alcohol, dodecyl alcohol, 2-ethylhexyl alcohol, ethylene glycol, diethylene glycol monoethers, propylene glycol, etc.). Specific examples of these esters include dibutyl adipate, di(2-ethylhexyl) sebacate, di-n-hexyl fumarate, dioctyl sebacate, diisooctyl azelate, diisodecyl azelate, dioctyl isothalate, didecyl phthalate, dieicosyl sebacate, the 2-ethylhexyl diester of linoleic acid dimer, and the complex ester formed by reacting one mole of sebasic acid with two moles of tetraethylene glycol and two moles of 2-ethyl-hexanoic acid, and the like. A preferred type of oil from this class of synthetic oils is adipates of C.sub.4 to C.sub.12 alcohols. [0016] Esters useful as synthetic lubricating oils also include those made from C.sub.5 to C.sub.12 monocarboxylic acids and polyols and polyol ethers such as neopentyl glycol, trimethylolpropane pentaeythritol, dipentaerythritol, tripentaerythritol, and the like. [0017] Silicon-based oils (such as the polyalkyl-, polyaryl-, polyalkoxy-, or polyaryloxy-siloxane oils and silicate oils) comprise another useful class of synthetic lubricating oils. These oils include tetra-ethyl silicate, tetra-isopropyl silicate, tetra-(2-ethylhexyl) silicate, tetra-(4-methyl-2-ethylhexyl) silicate, tetra-(p-tert-butylphenyl) silicate, hexa-(4-methyl-2-pentoxy)-disiloxane, poly(methyl)-siloxanes and poly (methylphenyl) siloxanes, and the like. Other synthetic lubricating oils include liquid esters of phosphorus containing acids (e.g., tricresyl phosphate, trioetylphosphate, and diethyl ester of decylphosphonic acid), polymeric tetra-hydrofurans, poly-alpha-olefins, and the like. Dispersants Continue reading about Boron free automotive gear oil... Full patent description for Boron free automotive gear oil Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Boron free automotive gear oil patent application. ###
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