EP2880137A1 - Procédé pour améliorer la compatibilité d'un joint en nitrile avec des huiles lubrifiantes - Google Patents

Procédé pour améliorer la compatibilité d'un joint en nitrile avec des huiles lubrifiantes

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Publication number
EP2880137A1
EP2880137A1 EP13742580.7A EP13742580A EP2880137A1 EP 2880137 A1 EP2880137 A1 EP 2880137A1 EP 13742580 A EP13742580 A EP 13742580A EP 2880137 A1 EP2880137 A1 EP 2880137A1
Authority
EP
European Patent Office
Prior art keywords
oil
lubricating oil
lubricating
derivative
alkyl
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13742580.7A
Other languages
German (de)
English (en)
Inventor
Anne M. SHOUGH
David J. Baillargeon
Steven M. Jetter
Douglas Edward Deckman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ExxonMobil Technology and Engineering Co
Original Assignee
ExxonMobil Research and Engineering Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ExxonMobil Research and Engineering Co filed Critical ExxonMobil Research and Engineering Co
Publication of EP2880137A1 publication Critical patent/EP2880137A1/fr
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
    • C10M135/32—Heterocyclic sulfur, selenium or tellurium compounds
    • C10M135/36—Heterocyclic sulfur, selenium or tellurium compounds the ring containing sulfur and carbon with nitrogen or oxygen
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
    • C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
    • C10M129/26—Carboxylic acids; Salts thereof
    • C10M129/28—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M129/38—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 8 or more carbon atoms
    • C10M129/42—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 8 or more carbon atoms polycarboxylic
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
    • C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
    • C10M129/68—Esters
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M133/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen
    • C10M133/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms
    • C10M133/16—Amides; Imides
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
    • C10M135/02—Sulfurised compounds
    • C10M135/04—Hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
    • C10M135/08—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium containing a sulfur-to-oxygen bond
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
    • C10M135/32—Heterocyclic sulfur, selenium or tellurium compounds
    • C10M135/34—Heterocyclic sulfur, selenium or tellurium compounds the ring containing sulfur and carbon only
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M139/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing atoms of elements not provided for in groups C10M127/00 - C10M137/00
    • C10M139/02—Esters of silicon acids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C10M2203/102—Aliphatic fractions
    • C10M2203/1025—Aliphatic fractions used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/129—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of thirty or more carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/283—Esters of polyhydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/02—Sulfur-containing compounds obtained by sulfurisation with sulfur or sulfur-containing compounds
    • C10M2219/022—Sulfur-containing compounds obtained by sulfurisation with sulfur or sulfur-containing compounds of hydrocarbons, e.g. olefines
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/10—Heterocyclic compounds containing sulfur, selenium or tellurium compounds in the ring
    • C10M2219/104—Heterocyclic compounds containing sulfur, selenium or tellurium compounds in the ring containing sulfur and carbon with nitrogen or oxygen in the ring
    • C10M2219/106—Thiadiazoles
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
    • C10M2223/04—Phosphate esters
    • C10M2223/045—Metal containing thio derivatives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2227/00—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
    • C10M2227/06—Organic compounds derived from inorganic acids or metal salts
    • C10M2227/061—Esters derived from boron
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/073—Star shaped polymers
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/36—Seal compatibility, e.g. with rubber
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/25—Internal-combustion engines
    • C10N2040/255—Gasoline engines

Definitions

  • This disclosure relates to lubricating engines using formulated lubricating oils that exhibit nitrile seal compatibility in the engine.
  • This disclosure relates to a method of improving the seal compatibility performance of lubricating oil compositions used in engine crankcases and transmissions, particularly lubricating oil compositions having sulphur content, and to lubricating oils having sulphur content that exhibit enhanced seal compatibility performance in engines and transmissions containing nitrile rubber seal materials.
  • Lubricants in commercial use today are prepared from a variety of natural and synthetic base stocks admixed with various additive packages and solvents depending upon their intended application.
  • the base stocks typically include mineral oils, poly alpha olefins (PAO), gas-to-liquid base oils (GTL), silicone oils, phosphate esters, diesters, polyol esters, and the like.
  • Lubricating oils used to lubricate internal combustion engines and transmissions contain a major amount of a base oil of lubricating viscosity, or a mixture of such oils, and additives used to improve the performance characteristics of the oil.
  • additives are used to improve detergency, to reduce engine wear, to provide stability against heat and oxidation, to reduce oil consumption, to inhibit corrosion, to act as a dispersant, and to reduce friction loss.
  • Some additives provide multiple benefits, such as dispersant-viscosity modifiers.
  • base oils contain sulfur, and a number of extremely effective additives conventionally used in engine and transmission lubricating oil compositions, including zinc dialkyl dithiophosphates (ZDDP), certain molybdenum-sulfur compounds, ashless dithiocarbamates and sulfonate and some phenate detergents, also contain sulfur and contribute to the overall sulfur content of such formulated lubricants.
  • ZDDP zinc dialkyl dithiophosphates
  • certain molybdenum-sulfur compounds ashless dithiocarbamates and sulfonate and some phenate detergents
  • Elastomer compatibility is a critical parameter for many lubrication specifications.
  • the detailed chemistry of elastomer compatibility is relatively unknown, thus adjusting formulations for suitable elastomer compatibility is not straightforward and can lead to significant costs.
  • nitrile-based elastomers tend to be very challenging materials for lubricant-elastomer compatibility. It is therefore valuable and essential to identifying lubricant base stocks that are capable of improving elastomer compatibility. This will allow not only for improved lubricant formulations but also a greater understanding of elastomer compatibility chemistry.
  • Modern internal combustion engines and transmissions include numerous gaskets and other seals formed of nitrile rubber materials.
  • Lubricant sulfur has been found to contribute to the deterioration of materials.
  • engine manufacturers (oftentimes referred to as “original equipment manufacturers” or “OEMs") require passage of a number of performance tests, including tests for compatibility with engine seal materials. Therefore, it would be desirable to provide a method of improving the seal compatibility of lubricating oils, particularly lubricating oils having significant sulfur contents, and lubricating oils having significant sulfur contents that provide improved seal-compatibility performance.
  • This disclosure relates to a method of improving the seal compatibility performance of lubricating oil compositions used in engine crankcases and transmissions, particularly lubricating oil compositions having sulphur content, and to lubricating oils having sulphur content that exhibit enhanced seal compatibility performance in engines and transmissions containing nitrile rubber seal materials.
  • This disclosure is directed in part to a method of improving nitrile seal compatibility with a lubricating oil in an engine lubricated with the lubricating oil.
  • the method comprises using as the lubricating oil a formulated oil comprising a lubricating oil base stock as a major component and one or more additives selected from the group consisting of (i) a sulfone, sulfolane, or derivative thereof; (ii) a borate ester, boron amide, or mixtures thereof; (iii) a sulfurized olefin; (iv) a thiadiazole or derivative thereof; and (v) a succinic anhydride or derivative thereof, as a minor component.
  • Nitrile seal compatibility is improved as compared to nitrile seal compatibility achieved using a lubricating oil containing a minor component other than the one or more additives.
  • This disclosure relates in part to a lubricating engine oil comprising a lubricating oil base stock as a major component and one or more additives selected from the group consisting of (i) a sulfone, sulfolane, or derivative thereof; (ii) a borate ester, boron amide, or mixtures thereof; (iii) a sulfurized olefin; (iv) a thiadiazole or derivative thereof; and (v) a succinic anhydride or derivative thereof, as a minor component.
  • additives selected from the group consisting of (i) a sulfone, sulfolane, or derivative thereof; (ii) a borate ester, boron amide, or mixtures thereof; (iii) a sulfurized olefin; (iv) a thiadiazole or derivative thereof; and (v) a succinic anhydride or derivative thereof, as a minor component.
  • the one or more additives are present in an amount sufficient for the lubricating oil to exhibit improved nitrile seal compatibility as compared to nitrile seal compatibility achieved using a lubricating oil containing a minor component other than the one or more additives.
  • certain additives including (i) a sulfone, sulfolane, or derivative thereof; (ii) a borate ester, boron amide, or mixtures thereof; (iii) a sulfurized olefin; (iv) a thiadiazole or derivative thereof; and (v) a succinic anhydride or derivative thereof, have been found to improve nitrile seal compatibility with lubricating oils when compared to nitrile seal compatibility achieved using a lubricating oil containing an additive other than these additives.
  • This disclosure provides lubricating oils useful as engine oils and in other applications characterized by an excellent nitrile seal compatibility characteristics.
  • the lubricating oils are based on high quality base stocks including a major portion of a hydrocarbon base fluid such as a PAO or GTL.
  • the lubricating oils also include one or more additives selected from the group consisting of (i) a sulfone, sulfolane, or derivative thereof; (ii) a borate ester, boron amide, or mixtures thereof; (iii) a sulfurized olefin; (iv) a thiadiazole or derivative thereof; and (v) a succinic anhydride or derivative thereof, as a minor component.
  • the Applicants have unexpectedly and surprisingly discovered that certain engine oil compositions including PAO or GTL base stocks with one or more additive indicated in the preceding sentence have yielded unexpected improvements in nitrile seal compatibility characteristics.
  • the lubricating oil base stock can be any oil boiling in the lube oil boiling range, typically between 100 to 600°C. In the present specification and claims, the terms base oil(s) and base stock(s) are used interchangeably.
  • Lubricating oils that are useful in the present disclosure are both natural oils and synthetic oils. Natural and synthetic oils (or mixtures thereof) can be used unrefined, refined, or rerefmed (the latter is also known as reclaimed or reprocessed oil). Unrefined oils are those obtained directly from a natural or synthetic source and used without added purification. These include shale oil obtained directly from retorting operations, petroleum oil obtained directly from primary distillation, and ester oil obtained directly from an esterification process. Refined oils are similar to the oils discussed for unrefined oils except refined oils are subjected to one or more purification steps to improve the at least one lubricating oil property.
  • Natural oils include animal oils, vegetable oils (castor oil and lard oil, for example), and mineral oils. Animal and vegetable oils possessing favorable thermal oxidative stability can be used. Of the natural oils, mineral oils are preferred. Mineral oils vary widely as to their crude source, for example, as to whether they are paraffmic, naphthenic, or mixed paraffmic-naphthenic. Oils derived from coal or shale are also useful in the present disclosure. Natural oils vary also as to the method used for their production and purification, for example, their distillation range and whether they are straight run or cracked, hydrorefined, or solvent extracted.
  • API Group I, II, III, IV and V are broad categories of base oil stocks developed and defined by the American Petroleum Institute (API Publication 1509; www.API.org) to create guidelines for lubricant base oils.
  • Group I base stocks have a viscosity index of between 80 to 120 and contain greater than 0.03% sulfur and less than 90% saturates.
  • Group II base stocks have a viscosity index of between 80 to 120, and contain less than or equal to 0.03% sulfur and greater than or equal to 90% saturates.
  • Group III stock has a viscosity index greater than 120 and contains less than or equal to 0.03% sulfur and greater than 90% saturates.
  • Group IV includes polyalphaolefms (PAO).
  • Group V base stocks include base stocks not included in Groups I-IV. The table below summarizes properties of each of these five groups.
  • Synthetic oils include hydrocarbon oil such as polymerized and interpolymerized olefins (polybutylenes, polypropylenes, propylene isobutylene copolymers, ethylene-olefin copolymers, and ethylene-alphaolefin copolymers, for example).
  • Polyalphaolefm (PAO) oil base stocks the Group IV API base stocks, are a commonly used synthetic hydrocarbon oil.
  • PAOs derived from C 8 , C 10 , C 12 , C 14 olefins or mixtures thereof may be utilized. See U.S. Patent Nos.
  • Group IV oils that is, the PAO base stocks have viscosity indices preferably greater than 130, more preferably greater than 135, still more preferably greater than 140.
  • Esters in a minor amount may be useful in the lubricating oils of this disclosure. 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, sebacic acid, fumaric acid, adipic acid, linoleic acid dimer, malonic acid, alkyl malonic acid, alkenyl malonic acid, etc., with a variety of alcohols such as butyl alcohol, hexyl alcohol, dodecyl alcohol, 2-ethylhexyl alcohol, etc.
  • dicarboxylic acids such as phthalic acid, succinic acid, sebacic acid, fumaric acid, adipic acid, linoleic acid dimer, malonic acid, alkyl malonic acid, alkenyl malonic acid, etc.
  • alcohols such as butyl alcohol, hexyl alcohol, dodecyl alcohol, 2-ethylhexyl alcohol, etc.
  • esters include dibutyl adipate, di(2-ethylhexyl) sebacate, di-n-hexyl fumarate, dioctyl sebacate, diisooctyl azelate, diisodecyl azelate, dioctyl phthalate, didecyl phthalate, dieicosyl sebacate, etc.
  • Particularly useful synthetic esters are those which are obtained by reacting one or more polyhydric alcohols, preferably the hindered polyols such as the neopentyl polyols; e.g., neopentyl glycol, trimethylol ethane, 2-methyl- 2-propyl-l,3-propanediol, trimethylol propane (TMP), pentaerythritol and dipentaerythritol with alkanoic acids containing at least 4 carbon atoms, preferably C 5 to C 30 acids such as saturated straight chain fatty acids including caprylic acid, capric acids, lauric acid, myristic acid, palmitic acid, stearic acid, arachic acid, and behenic acid, or the corresponding branched chain fatty acids or unsaturated fatty acids such as oleic acid, or mixtures of any of these materials.
  • the hindered polyols such as the neopentyl polyol
  • Esters should be used in an amount such that the improved nitrile seal compatibility provided by the lubricating oils of this disclosure is not adversely affected.
  • the esters preferably have a D5293 viscosity of less than 10,000 cP at -35°C.
  • alkylated aromatic base stocks for example, alkylated naphthalenes and alkylated benzenes.
  • the alkylated aromatic co-base stock can be any hydrocarbyl molecule that contains at least 5% of its weight derived from an aromatic moiety such as a benzenoid moiety or naphthenoid moiety, or their derivatives.
  • alkylated aromatic co-base stocks include alkyl benzenes, alkyl naphthalenes, alkyl diphenyl oxides, alkyl naphthols, alkyl diphenyl sulfides, alkylated bis-phenol A, alkylated thiodiphenol, and the like.
  • the alkylated aromatic co-base stock can be mono- alkylated, dialkylated, polyalkylated, and the like.
  • the aromatic can be mono- or poly-functionalized.
  • the hydrocarbyl groups can range from C 6 up to C 60 with a range of C 8 to C 40 often being preferred. A mixture of hydrocarbyl groups is often preferred.
  • the hydrocarbyl group can optionally contain sulfur, oxygen, and/or nitrogen containing substituents.
  • the aromatic group can also be derived from natural (petroleum) sources, provided at least 5% of the molecule is comprised of an above-type aromatic moiety.
  • Viscosities at 100°C of approximately 3 cSt to 50 cSt are preferred, with viscosities of approximately 3.4 cSt to 20 cSt often being more preferred for the alkylated aromatic co-base stock.
  • Naphthalene or methyl naphthalene for example, can be alkylated with olefins such as octene, decene, dodecene, tetradecene or higher, mixtures of similar olefins, and the like.
  • alkyl naphthalenes are mono-, di-, tri-, tetra-, or penta-C 3 alkyl naphthalene, C 4 alkyl naphthalene, C 5 alkylnaphthalene, C 6 alkyl naphthalene, C 8 alkyl naphthalene, C 10 alkyl naphthalene, C 1-2 alkyl naphthalene, Ci -4 alkyl naphthalene, C 1-6 alkyl naphthalene, C J-8 alkyl naphthalene, etc., C 10 -C 14 mixed alkyl naphthalene, C 6 -Ci 8 mixed alkyl naphthalene, or the mono-, di-, tri-, tetra-, or penta-C 3 , C , C 5 , C 6 , C 8 , Ci 0 , C 12 , C 14 , C 16
  • the alkyl group can also be branched alkyl group with C 10 to C 3 oo, e.g., C 24 -C 56 branched alkyl naphthalene, C 2 -C 56 branched alkyl mono-, di-, tri-, tetra- or penta-Ci-C 4 naphthalene.
  • C 24 -C 56 branched alkyl naphthalene C 2 -C 56 branched alkyl mono-, di-, tri-, tetra- or penta-Ci-C 4 naphthalene.
  • These branched alkyl group substituted naphthalenes or branched alkyl group substituted mono-, di-, tri-, tetra- or penta-Ci-C 4 naphthalene can also be used as mixtures with the previously recited materials.
  • These branched alkyl group can be prepared from oligomerization of small olefins, such as C 5 to C 24 alpha- or internal-olefins.
  • small olefins such as C 5 to C 24 alpha- or internal-olefins.
  • the alkyl groups on the naphthalene ring can also be mixtures of the above alkyl groups. Sometimes mixed alkyl groups are advantageous because they provide more improvement of pour points and low temperature fluid properties.
  • the fully hydrogenated fluid alkylnaphthalenes can also be used for blending with GTL base stock/base oil, but the alkyl naphthalenes are preferred.
  • Suitable alkylated naphthalenes are available commercially from ExxonMobil under the tradename Synesstic AN or from King Industries under the tradename NA-Lube naphthalene-containing fluids.
  • Illustrative alkylated benzenes useful in this disclosure include, for example, those described in U.S. Patent Publication 2008/0300157. Alkylated benzenes having a viscosity at 100°C of 1.5 to 600 cS, VI of 0 to 200 and pour point of 0°C or less, preferably -15°C or less, more preferably -25°C or less, still more preferably -35°C or less, most preferably -60°C or less are useful for this disclosure.
  • Illustrative monoalkylated benzenes include, for example, linear C 10 to C 30 alkyl benzene or a Ci 0 -C 30 o branched alkyl benzene, preferably Ci 0 -Cioo branched alkyl benzene, more preferably Ci 5 -C 50 branched alkyl group.
  • Illustrative miltialkylated benzenes include, for example, those in which one or two of the alkyl groups can be small alkyl radical of Cj to C 5 alkyl group, preferably C C 2 alkyl group.
  • the other alkyl group or groups can be any combination of linear Ci 0 -C 30 alkyl group, or branched Ci 0 and higher up to C 30 o alkyl group, preferably Ci 5 -C 50 branched alkyl group.
  • These branched large alkyl radicals can be prepared from the oligomerization or polymerization of C 3 to C 2 o, internal or alpha-olefins or mixture of these olefins.
  • the total number of carbons in the alkyl substituents ranged from C 10 to C 30 o - Preferred alkyl benzene fluids can be prepared according to U.S. Patent Nos. 6,071,864 and 6,491,809.
  • Non-conventional or unconventional base stocks and/or base oils include one or a mixture of base stock(s) and/or base oil(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 oils derived from synthetic wax, natural wax or waxy feeds, mineral and/or non- mineral oil waxy feed stocks such as gas oils, slack waxes (derived from the solvent dewaxing of natural oils, mineral oils or synthetic oils; e.g., Fischer-Tropsch feed stocks), natural waxes, and waxy stocks such as gas oils, waxy fuels hydrocracker bottoms, waxy raffinate, hydrocrackate, thermal crackates, foots oil or other mineral, mineral oil, or even non-petroleum oil derived waxy materials such as waxy materials recovered from coal liquefaction or shale oil, linear or branche
  • 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 feed stocks such as hydrogen, carbon dioxide, carbon monoxide, water, methane, ethane, ethylene, acetylene, propane, propylene, propyne, butane, butylenes, and butynes.
  • GTL base stocks and/or base oils are GTL materials of lubricating viscosity that are generally derived from hydrocarbons; for example, waxy synthesized hydrocarbons, that are themselves derived from simpler gaseous carbon-containing compounds, hydrogen- containing compounds and/or elements as feed stocks.
  • GTL base stock(s) and/or base oil(s) include oils boiling in the lube oil boiling range (1) separated/fractionated from synthesized GTL materials such as, for example, by distillation and subsequently subjected to a final wax processing step which involves either or both of a catalytic dewaxing process, or a solvent dewaxing process, to produce lube oils of reduced/low pour point; (2) synthesized wax isomerates, comprising, for example, hydrodewaxed or hydroisomerized cat and/or solvent dewaxed synthesized wax or waxy hydrocarbons; (3) hydrodewaxed or hydroisomerized cat and/or solvent dewaxed Fischer-Tropsch (F-T) material (i.e., hydrocarbons, waxy hydrocarbons, waxes and possible analogous oxygenates); preferably hydrodewaxed or hydroisomerized/followed by cat and/or solvent dewaxing dewaxed F-T waxy hydrocarbons, or hydrodewaxed
  • GTL base stock(s) and/or base oil(s) derived from GTL materials are characterized typically as having kinematic viscosities at 100°C of from 2 mm 2 /s to 50 mm 2 /s (ASTM D445). They are further characterized typically as having pour points of -5°C to -40°C or lower (ASTM D97). They are also characterized typically as having viscosity indices of 80 to 140 or greater (ASTM D2270).
  • GTL base stock(s) and/or base oil(s) are typically highly paraffmic (>90% 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.
  • GTL base stock(s) and/or base oil(s) typically have very low sulfur and nitrogen content, generally containing less than 10 ppm, and more typically less than 5 ppm of each of these elements.
  • the sulfur and nitrogen content of GTL base stock(s) and/or base oil(s) obtained from F-T material, especially F-T wax, is essentially nil.
  • the absence of phosphorous and aromatics make this materially especially suitable for the formulation of low SAP products.
  • GTL base stock and/or base oil and/or wax isomerate base stock and/or base oil is to be understood as embracing individual fractions of such materials of wide viscosity range as recovered in the production process, mixtures of two or more of such fractions, as well as mixtures of one or two or more low viscosity fractions with one, two or more higher viscosity fractions to produce a blend wherein the blend exhibits a target kinematic viscosity.
  • the GTL material, from which the GTL base stock(s) and/or base oil(s) is/are derived is preferably an F-T material (i.e., hydrocarbons, waxy hydrocarbons, wax).
  • Base oils for use in the formulated lubricating oils useful in the present disclosure are any of the variety of oils corresponding to API Group I, Group II, Group III, Group IV, Group V and Group VI oils and mixtures thereof, preferably API Group II, Group III, Group IV, Group V and Group VI oils and mixtures thereof, more preferably the Group III to Group VI base oils due to their exceptional volatility, stability, viscometric and cleanliness features.
  • Minor quantities of Group I stock, such as the amount used to dilute additives for blending into formulated lube oil products, can be tolerated but should be kept to a minimum, i.e. amounts only associated with their use as diluent/carrier oil for additives used on an "as-received" basis.
  • the Group II stock be in the higher quality range associated with that stock, i.e. a Group II stock having a viscosity index in the range 100 ⁇ VI ⁇
  • the GTL base stock(s) and/or base oil(s) are typically highly paraffmic (>90% 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.
  • GTL base stock(s) and/or base oil(s) and hydrodewaxed, or hydroisomerized/cat (and/or solvent) dewaxed base stock(s) and/or base oil(s) typically have very low sulfur and nitrogen content, generally containing less than 10 ppm, and more typically less than 5 ppm of each of these elements.
  • the sulfur and nitrogen content of GTL base stock(s) and/or base oil(s) obtained from F-T material, especially F-T wax, is essentially nil.
  • the absence of phosphorous and aromatics make this material especially suitable for the formulation of low sulfur, sulfated ash, and phosphorus (low SAP) products.
  • the base stock component can preferably be a mixture of one or more of the API Group I, II, III, IV and V base oil stocks.
  • the base stock component of the present lubricating oils will typically be from 80 to 99 weight percent of the total composition (all proportions and percentages set out in this specification are by weight unless the contrary is stated) and more usually in the range of 90 to 99 weight percent.
  • a sulfone, sulfolane, or derivative thereof can be used as a nitrile seal compatibility additive in the formulations of this disclosure.
  • a sulfone, sulfolane, or derivative thereof such as a substituted sulfolane from Lubrizol, Inc., Afton Corp., for example Lubrizol® 730, can be used in an effective amount up to 1.0 volume percent, and more preferably from 0.03 to 1.0 percent by weight of the complete motor oil formula and up to 5 times that amount in the concentrate.
  • sulfone, sulfolane, or derivative thereof include 3-alkoxysulfolane or the like, in which the alkoxy group contains at least 4 and preferably 4 to 25 carbon atoms. See U.S. Patent Nos. 4,029,587 and 4,1 16,877, the disclosures of which are incorporated herein by reference.
  • the sulfone and sulfolane compounds and particularly the substituted sulfones and sulfolanes, are a preferred additives in the formulations of this disclosure.
  • the sulfone and sulfolane compounds are also useful as seal swell additives.
  • nitrile seal compatibility additives suitable in the present disclosure include 3-isodecoxysulfolane, and other substituted sulfolanes including those having: i) a hydrocarbon-based radical having at least 4 carbon atoms such as aliphatic, (e.g., alkyl or alkenyl), alicyclic (e.g., cycloalkyl or cycloalkenyl), aromatic, aliphatic- and alicyclic-substituted aromatic, aromatic- substituted aliphatic and alicyclic radicals, and the like; examples include butyl, pentyl, hexyl, octyl, decyl, dodecyl, eicosyl, decenyl, cyclohexyl, phenyl, tolyl, heptylphenyl, isopropenylphenyl and naphthyl; ii) substituted hydrocarbon radicals containing
  • Other preferred substituted sulfolanes are those in which a hydrocarbon radical is selected free from acetylenic unsaturation and which contains 4-100 carbon atoms.
  • Examples are butyl, amyl, hexyl, octyl, decyl, dodecyl, eicosyl, triacontanyl, butenyl, dodecenyl, phenyl, naphthyl, tolyl, dodecylphenyl, tetrapropene-alkylated phenyl, phenethyl, cyclohexyl and methylcyclohexyl.
  • Each of substituted hydrocarbon radicals and hetero radicals are hydrogen or a lower alkylbased (and usually a lower alkyl) radical, the word "lower” denoting radicals containing up to 7 carbon atoms.
  • lower alkyl radicals all isomers being included, but especially the straight chain radicals
  • methyl ethyl, propyl, butyl and hexyl, with methyl being preferred.
  • substituted sulfolanes comprise a class of compounds which may be prepared by the reaction of 3-sulfolene or a substituted derivative thereof with an organic hydroxy compound, ordinarily an alcohol. This method for their preparation is described, for example, in U.S. Patent No. 2,393,925.
  • the 3-sulfolenes may be prepared by reaction of sulfur dioxide with a conjugated diene such as butadiene or isoprene.
  • aliphatic alcohols of 8 to 13 carbon atoms e.g., tridecyl alcohol in combination with an oil-soluble, saturated hydrocarbyl ester of 10 to 60 carbon atoms and 2 to 3 ester linkages, e.g., dihexyl phthalate are useful.
  • Ci-C 8 alkyl substituted phosphites, Cj to C 4 alkyl substituted phenols or aromatic secondary amine and a dispersant copolymer containing N-vinyl-2-pyrrolidone, an organophosphite, such as tris(nonylphenyl) phosphite and mixtures of organic phosphite ester and methylene bisphenol are useful for oxidation inhibitors for lubricating oils and for elastomers, including nitrile rubbers.
  • Illustrative borate esters and boron amides useful in this disclosure include, for example, borate esters and boronate esters derived from boric acids or boronic acids, amides and glycerides, and mixtures thereof.
  • the borate esters and boronate esters can provide ashless, almost phosphorus-free and sulfur-free antiwear, extreme pressure friction modifying additives for lubricating oils and fuels.
  • Useful borate esters and boron amides are disclosed, for example, in EP 1 625 193, U.S. Patent Nos.
  • Borate esters and boron amides may include borated alkyl diethanol amides, borated mono glycerides, and Vanlube® 289 available from .T. Vanderbilt Company.
  • Preferred borate esters and boron amides include mixtures of borated alkyl diethanol amides and borated mono glycerides.
  • the borate esters are also useful as antiwear additives and dispersants.
  • the sulfurized olefins useful in the present disclosure can be prepared by a number of known methods. They are characterized by the type of olefm used in their production and their final sulfur content. High molecular weight olefms, i.e., those olefins having an average molecular weight of 168 to 351 g/mole, are preferred. Examples of olefins that may be used include alpha-olefins, isomerized alpha-olefms, branched olefms, cyclic olefms, and combinations of these.
  • Suitable alpha-olefins include any C 4 -C 2 5 alpha-olefms.
  • Alpha-olefins may be isomerized before the sulfurization reaction or during the sulfurization reaction.
  • Structural and/or conformational isomers of the alpha olefm that contain internal double bonds and/or branching may also be used.
  • isobutylene is the branched olefin counterpart of the alphaolefm 1-butene.
  • Sulfur sources that may be used in the sulfurization reaction include: elemental sulfur, sulfur monochloride, sulfur dichloride, sodium sulfide, sodium hydrosulfide, sodium polysulfide, and mixtures of these added together or at different stages of the sulfurization process.
  • Unsaturated fatty acids and oils because of their unsaturation, may also be sulfurized and used in this disclosure.
  • fatty acids examples include lauroleic acid, myristoleic acid, palmitoleic acid, oleic acid, elaidic acid, vaccenic acid, linoleic acid, linolenic acid, gadoleic acid, arachidonic acid, erucic acid, and mixtures of these.
  • oils or fats examples include corn oil, cottonseed oil, grapeseed oil, olive oil, palm oil, peanut oil, rapeseed oil, safflower seed oil, sesame seed oil, soyabean oil, sunflower seed oil, and combinations of these.
  • Unsaturated oils include oleyl oleate, jojoba oil, and the like.
  • Unsaturated fats include lard, and the like.
  • the concentration of sulfurized olefin in the formulated lubricant oil can vary depending upon the applications, and the desired level of nitrile seal compatibility required for the specific formulated oil.
  • An important criteria for selecting the concentration of the sulfurized olefin used in the formulated oil is the sulfur concentration of the sulfurized olefin itself.
  • the sulfurized olefin should deliver between 0.05 wt% and 0.30 wt% of sulfur to the finished lubricant formulation.
  • a sulfurized olefin containing 20 wt% sulfur content should be used at levels between 0.25 wt% and 1.5 wt% to deliver between 0.05 wt% and 0.30 wt% sulfur to the finished oil.
  • a sulfurized olefin containing 10 wt% sulfur content should be used between 0.5 wt% and 3.0 wt% to deliver between 0.05 wt% and 0.30 wt% sulfur to the finished oil.
  • Examples of commercial sulfurized olefins which may be used in the present disclosure include Hitec® 7084 which contains approximately 20 wt% sulfur content, Hitec® 7188 which contains approximately 12 wt% sulfur content, Hitec® 312 which contains approximately 47.5 wt% sulfur content, and Hitec® 313 which contains approximately 47.5 wt% sulfur content, all from Afton Corporation, and Additin® C 2540-A which contains approximately 38 wt% sulfur content, from Rhein Chemie Corporation.
  • sulfurized fatty oils or mixtures of sulfurized fatty oils and olefins, that may be used in the present disclosure include Additin® R 4410 which contains approximately 9.5 wt% sulfur content, Additin® R 4412-F which contains approximately 12.5 wt% sulfur content, Additin® 4417 which contains approximately 17.5 wt% sulfur content, Additin® RC 2515 which contains approximately 15 wt% sulfur content, Additin® RC 2526 which contains approximately 26 wt% sulfur content, Additin® RC 2810-A which contains approximately 10 wt% sulfur content, Additin® RC 2814-A which contains approximately 14 wt% sulfur content, and Additin® RC 2818-A which contains approximately 16 wt% sulfur content, all from Rhein Chemie Corporation. It is preferred that the sulfurized olefin and/or fatty oil be a liquid of low corrosivity and low active sulfur content as determined by ASTM D1662.
  • Sulfurized olefins which may also be employed in the present disclosure, are typically prepared by the reaction of a C 3 -C 6 olefin, including sulfurized isobutylene, or a low-molecular-weight polyolefm derived therefrom with a sulfur-containing compound such as sulfur, sulfur monochloride, and/or sulfur dichloride. Sulfurized olefins are also useful as antioxidants.
  • the thiadiazole component of the present additive composition is a non-polycarboxylate moiety-containing thiadiazole.
  • the thiadiazole comprises at least one of 2,5-dimercapto-l,3,4-thiadiazole; 2-mercapto- 5-hydrocarbylthio- 1 ,3,4-thiadiazoles; 2-mercapto-5-hydrocarbyl- dithio- 1,3,4-thiadiazoles; 2,5-bis(hydrocarbylthio and 2,5-bis(hydrocarbyldithio)- 1,3,4-thiadiazoles.
  • the more preferred compounds are the 1,3,4-thiadiazoles, especially the 2-hydrocarbyidithio-5-mercapto-l,3,4-dithiadiazoles and the 2,5-bis(hydrocarbyidithio)- 1,3,4-thiadiazoles, a number of which are available as articles of commerce.
  • a non-polycarboxylate-containing thiadiazole containing 4.0 wt % 2,5-dimercapto-l,3,4-thiadiazole which may be either Afton Corporation's Hitec® 4313 or Lubrizol Corporation's Lubrizol® 5955A, is used.
  • Hitec® 4313 may be obtained from Afton Corporation, Richmond, Va.
  • Lubrizol® 5955A may be obtained from Lubrizol Corporation, Wycliiffe, Ohio.
  • Thiadiazoles are also useful as antioxidants and sulfur scavengers.
  • the succinic anhydride component of the present gear oil additive composition is an alkyl or alkenyl succinic anhydride, wherein the alkyl or alkenyl group has a number average molecular weight of 160 to 700.
  • the succinic anhydride is an alkenyl succinic anhydride.
  • Preferred alkenyl succinic anhydrides include tetrapropenyl succinic anhydride and polyisobutenyl succinic anhydride.
  • the alkenyl succinic anhydride is a polyisobutenyl succinic anhydride
  • the polyisobutenyl group will preferably have a molecular weight of 250 to 700, more preferably 450 to 650, and most preferably 500 to 600.
  • a particularly preferred polyisobutenyl group will have a molecular weight of 550.
  • PIBSA polyisobutenyl succinic anhydride
  • the PIBSA can be prepared by a number of methods.
  • One example of preparing PIBSA by a thermal reaction is disclosed in U.S. Patent No. 6,156,850.
  • Other methods of PIBSA preparation include using a chlorinated polyisobutene as disclosed in U.S. Patent No. 4,234,435.
  • the succinic anhydrides are also useful as dispersants.
  • the nitrile seal compatibility additives are typically used in an amount from 0.01 wt% to 2 wt%, preferably 0.025 wt% to 1.5 wt%, and more preferably 0.5 wt% to 1.25 wt%, depending on the particular formulation.
  • the nitrile seal compatibility additive is preferably present in an amount sufficient for the lubricating oil to exhibit improved nitrile seal compatibility with a lubricating oil in an engine lubricated with the lubricating oil, as compared to nitrile seal compatibility achieved using a lubricating oil containing other than the nitrile seal compatibility additive, preferably improved change in tensile strength (%) and elongation at break (%) as determined by Nitrile-NB 34 (MB VDA 675301 Method).
  • the formulated lubricating oil useful in the present disclosure may additionally contain one or more of the other commonly used lubricating oil performance additives including but not limited to dispersants, other detergents, corrosion inhibitors, rust inhibitors, metal deactivators, other anti-wear agents and/or extreme pressure additives, anti-seizure agents, wax modifiers, viscosity index improvers, viscosity modifiers, fluid-loss additives, seal compatibility agents, other friction modifiers, lubricity agents, anti-staining agents, chromophoric agents, defoamants, demulsifiers, emulsifiers, densifiers, wetting agents, gelling agents, tackiness agents, colorants, and others.
  • dispersants including but not limited to dispersants, other detergents, corrosion inhibitors, rust inhibitors, metal deactivators, other anti-wear agents and/or extreme pressure additives, anti-seizure agents, wax modifiers, viscosity index improvers, viscosity
  • Viscosity improvers also known as Viscosity Index modifiers, and VI improvers
  • 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 10,000 to 1,000,000, more typically 20,000 to 500,000, and even more typically between 50,000 and 200,000.
  • 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, hydrogenated 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.
  • the amount of viscosity modifier may range from zero to 8 wt%, preferably zero to 4 wt%, more preferably zero to 2 wt% based on active ingredient and depending on the specific viscosity modifier used.
  • Typical antioxidant include phenolic antioxidants, aminic antioxidants and oil-soluble copper complexes.
  • the phenolic antioxidants include sulfurized and non-sulfurized phenolic antioxidants.
  • the terms "phenolic type" or "phenolic antioxidant” used herein includes compounds having one or more than one hydroxyl group bound to an aromatic ring which may itself be mononuclear, e.g., benzyl, or poly-nuclear, e.g., naphthyl and spiro aromatic compounds.
  • phenol type includes phenol per se, catechol, resorcinol, hydroquinone, naphthol, etc., as well as alkyl or alkenyl and sulfurized alkyl or alkenyl derivatives thereof, and bisphenol type compounds including such bi-phenol compounds linked by alkylene bridges sulfuric bridges or oxygen bridges.
  • Alkyl phenols include mono- and poly-alkyl or alkenyl phenols, the alkyl or alkenyl group containing from 3-100 carbons, preferably 4 to 50 carbons and sulfurized derivatives thereof, the number of alkyl or alkenyl groups present in the aromatic ring ranging from 1 to up to the available unsatisfied valences of the aromatic ring remaining after counting the number of hydroxyl groups bound to the aromatic ring.
  • the phenolic anti-oxidant may be represented by the general formula:
  • R ⁇ is a C j -C ioo alkylene or sulfur substituted alkylene group, preferably a C 2 -C 50 alkylene or sulfur substituted alkylene group, more preferably a C 2 -C 2 alkylene or sulfur substituted alkylene group, y is at least 1 to up to the available valences of Ar, x ranges from 0 to up to the available valances of Ar-y, z ranges from 1 to 10, n ranges from 0 to 20, and m is 0 to 4 and p is 0 or 1 , preferably
  • Preferred phenolic antioxidant compounds are the hindered phenolics and phenolic esters which contain a sterically hindered hydroxyl group, and these include those derivatives of dihydroxy aryl compounds in which the hydroxyl groups are in the o- or p-position to each other.
  • Typical phenolic antioxidants include the hindered phenols substituted with C j+ alkyl groups and the alkylene coupled derivatives of these hindered phenols.
  • phenolic materials of this type 2-t-butyl-4-heptyl phenol; 2-t-butyl-4-octyl phenol; 2-t-butyl-4-dodecyl phenol; 2,6-di-t-butyl-4-heptyl phenol; 2,6-di-t-butyl-4-dodecyl phenol; 2-methyl-6-t-butyl-4-heptyl phenol; 2-methyl-6-t-butyl-4-dodecyl phenol; 2,6-di-t-butyl-4-methyl phenol; 2,6-di-t-butyl-4-ethyl phenol; and 2,6-di-t-butyl- 4-alkoxy phenol; and
  • Phenolic type antioxidants are well known in the lubricating industry and commercial examples such as Ethanox® 4710, Irganox® 1076, Irganox® L1035, Irganox® 1010, Irganox® L109, Irganox® LI 18, Irganox® L135 and the like are familiar to those skilled in the art. The above is presented only by way of exemplification, not limitation on the type of phenolic antioxidants which can be used.
  • the phenolic antioxidant can be employed in an amount in the range of 0.1 to 3 wt%, preferably 0.25 to 2.5 wt%, more preferably 0.5 to 2 wt% on an active ingredient basis.
  • Aromatic amine antioxidants include phenyl- a-naphthyl amine which is described by the following molecular structure:
  • z is hydrogen or a Cj to C 14 linear or C 3 to C 14 branched alkyl group, preferably Cj to C 10 linear or C 3 to C 10 branched alkyl group, more preferably linear or branched C 6 to C 8 and n is an integer ranging from 1 to 5 preferably 1.
  • n is an integer ranging from 1 to 5 preferably 1.
  • Irganox L06 is Irganox L06.
  • aromatic amine antioxidants include other alkylated and non-alkylated aromatic amines such as aromatic monoamines of the formula R 8 R 9 R 10 N where R 8 is an aliphatic, aromatic or substituted aromatic group, R is an aromatic or a substituted aromatic group, and R 10 is H, alkyl, aryl or R n S(O) x R 12 where R 11 is an alkylene, alkenylene, or aralkylene group, R is a higher alkyl group, or an alkenyl, aryl, or alkaryl group, and x is 0, 1 or 2.
  • the aliphatic group R may contain from 1 to 20 carbon atoms, and preferably contains from 6 to 12 carbon atoms.
  • the aliphatic group is a saturated aliphatic group.
  • both R 8 and R 9 are aromatic or substituted aromatic groups, and the aromatic group may be a fused ring aromatic group such as naphthyl.
  • Aromatic groups R 8 and R 9 may be joined together with other groups such as S.
  • Typical aromatic amines anti-oxidants have alkyl substituent groups of at least 6 carbon atoms.
  • Examples of aliphatic groups include hexyl, heptyl, octyl, nonyl, and decyl. Generally, the aliphatic groups will not contain more than 14 carbon atoms.
  • the general types of such other additional amine antioxidants which may be present include diphenylamines, phenothiazines, imidodibenzyls and diphenyl phenylene diamines. Mixtures of two or more of such other additional aromatic amines may also be present. Polymeric amine antioxidants can also be used.
  • Another class of antioxidant used in lubricating oil compositions and which may also be present are oil-soluble copper compounds. Any oil-soluble suitable copper compound may be blended into the lubricating oil.
  • suitable copper antioxidants include copper dihydrocarbyl thio- or dithio- phosphates and copper salts of carboxylic acid (naturally occurring or synthetic).
  • Other suitable copper salts include copper dithiacarbamates, sulphonates, phenates, and acetylacetonates.
  • Basic, neutral, or acidic copper Cu(I) and or Cu(II) salts derived from alkenyl succinic acids or anhydrides are known to be particularly useful.
  • Such antioxidants may be used individually or as mixtures of one or more types of antioxidants, the total amount employed being an amount of 0.50 to 5 wt%, preferably 0.75 to 3 wt% (on an as-received basis).
  • Detergents In addition to the alkali or alkaline earth metal salicylate detergent which is an optional component in the present disclosure, other detergents may also be present. While such other detergents can be present, it is preferred that the amount employed be such as to not interfere with the synergistic effect attributable to the presence of the salicylate. Therefore, most preferably such other detergents are not employed.
  • additional detergents can include alkali and alkaline earth metal phenates, sulfonates, carboxylates, phosphonates and mixtures thereof.
  • These supplemental detergents can have total base number (TBN) ranging from neutral to highly overbased, i.e. TBN of 0 to over 500, preferably 2 to 400, more preferably 5 to 300, and they can be present either individually or in combination with each other in an amount in the range of from 0 to 10 wt%, preferably 0.5 to 5 wt% (active ingredient) based on the total weight of the formulated lubricating oil.
  • TBN total base number
  • Such additional other detergents include by way of example and not limitation calcium phenates, calcium sulfonates, magnesium phenates, magnesium sulfonates and other related components (including borated detergents).
  • Dispersants help keep these byproducts in solution, thus diminishing their deposition on metal surfaces.
  • Dispersants may be ashless or ash-forming in nature.
  • the dispersant is ashless.
  • So-called ashless dispersants are organic materials that form substantially no ash upon combustion.
  • non-metal-containing or borated metal-free dispersants are considered ashless.
  • metal-containing detergents discussed above form ash upon combustion.
  • Suitable dispersants typically contain a polar group attached to a relatively high molecular weight hydrocarbon chain.
  • the polar group typically contains at least one element of nitrogen, oxygen, and/or phosphorus. Typical hydrocarbon chains contain 50 to 400 carbon atoms.
  • 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.
  • Hydrocarbyl-substituted succinic acid compounds are popular dispersants.
  • succinimide, succinate esters, or succinate ester amides prepared by the reaction of a hydrocarbon-substituted succinic acid compound preferably having at least 50 carbon atoms in the hydrocarbon substituent, with at least one equivalent of an alkylene amine are particularly useful.
  • Succinimides are formed by the condensation reaction between alkenyl succinic anhydrides and amines. Molar ratios can vary depending on the amine or polyamine. For example, the molar ratio of alkenyl succinic anhydride to TEPA can vary from 1 : 1 to 5 : 1.
  • Succinate esters are formed by the condensation reaction between alkenyl succinic anhydrides and alcohols or polyols. Molar ratios can vary depending on the alcohol or polyol used. For example, the condensation product of an alkenyl succinic anhydride and pentaerythritol is a useful dispersant.
  • Succinate ester amides are formed by condensation reaction between alkenyl succinic anhydrides and alkanol amines.
  • suitable alkanol amines include ethoxylated polyalkylpolyamines, propoxylated polyalkylpolyamines and polyalkenylpolyamines such as polyethylene polyamines.
  • propoxylated hexamethylene diamine is propoxylated hexamethylene diamine.
  • the molecular weight of the alkenyl succinic anhydrides will typically range between 800 and 2,500.
  • the above products can be post-reacted with various reagents such as sulfur, oxygen, formaldehyde, carboxylic acids such as oleic acid, and boron compounds such as borate esters or highly borated dispersants.
  • the dispersants can be borated with from 0.1 to 5 moles of boron per mole of dispersant reaction product.
  • Mannich base dispersants are made from the reaction of alkylphenols, formaldehyde, and amines. 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 or more.
  • Typical high molecular weight aliphatic acid modified Mannich condensation products can be prepared from high molecular weight alkyl-substituted hydroxyaromatics or HN( ) 2 group-containing reactants.
  • Examples of high molecular weight alkyl-substituted hydroxyaromatic compounds are polypropylphenol, polybutylphenol, and other polyalkylphenols. These polyalkylphenols can be obtained by the alkylation, in the presence of an alkylating catalyst, such as BF 3 , of phenol with high molecular weight polypropylene, polybutylene, and other polyalkylene compounds to give alkyl substituents on the benzene ring of phenol having an average 600-100,000 molecular weight.
  • an alkylating catalyst such as BF 3
  • HN( ) 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 alkanes and their substituted analogs, e.g., ethylamine and diethanol amine; aromatic diamines, e.g., phenylene diamine, diamino naphthalenes; heterocyclic amines, e.g., morpholine, pyrrole, pyrrolidine, imidazole, imidazolidine, and piperidine; melamine and their substituted analogs.
  • alkylene polyamine reactants include ethylenediamine, diethylene triamine, triethylene tetraamine, tetraethylene pentaamine, pentaethylene hexamine, hexaethylene heptaamine, heptaethylene octaamine, octaethylene nonaamine, nonaethylene decamine, and decaethylene undecamine and mixture of such amines having nitrogen contents corresponding to the alkylene polyamines, in the formula H 2 N-(Z-NH-) n H, mentioned before, Z is a divalent ethylene and n is 1 to 10 of the foregoing formula.
  • propylene polyamines such as propylene diamine and di-, tri-, 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.
  • the alkylene polyamines obtained from the reaction of 2 to 1 1 moles of ammonia with 1 to 10 moles of dichloroalkanes having 2 to 6 carbon atoms and the chlorines on different carbons are suitable alkylene polyamine reactants.
  • Aldehyde reactants useful in the preparation of the high molecular products useful in this disclosure include the aliphatic aldehydes such as formaldehyde (also as paraformaldehyde and formalin), acetaldehyde and aldol ( ⁇ -hydroxybutyraldehyde). Formaldehyde or a formaldehyde-yielding reactant is preferred.
  • Preferred dispersants include borated and non-borated succinimides, including those derivatives from mono-succinimides, bis-succinimides, and/or mixtures of mono- and bis-succinimides, wherein the hydrocarbyl succinimide is derived from a hydrocarbylene group such as polyisobutylene having a Mn of from 500 to 5000 or more or a mixture of such hydrocarbylene groups.
  • Other preferred dispersants include succinic acid-esters and amides, alkylphenol-polyamine-coupled Mannich adducts, their capped derivatives, and other related components.
  • Such additives may be used in an amount of 0.1 to 20 wt%, preferably 0.1 to 8 wt%, more preferably 1 to 6 wt% (on an as-received basis) based on the weight of the total lubricant.
  • pour point depressants also known as lube oil flow improvers
  • Pour point depressant may be added to lower the minimum temperature at which the fluid will flow or can be poured.
  • suitable pour point depressants include alkylated naphthalenes polymethacrylates, polyacrylates, polyarylamides, condensation products of haloparaffm waxes and aromatic compounds, vinyl carboxylate polymers, and terpolymers of dialkylfumarates, vinyl esters of fatty acids and allyl vinyl ethers.
  • Such additives may be used in amount of 0.0 to 0.5 wt%, preferably 0 to 0.3 wt%, more preferably 0.001 to 0.1 wt% on an as-received basis.
  • Corrosion inhibitors are used to reduce the degradation of metallic parts that are in contact with the lubricating oil composition.
  • Suitable corrosion inhibitors include aryl thiazines, alkyl substituted dimercapto thiodiazoles thiadiazoles and mixtures thereof.
  • Such additives may be used in an amount of 0.01 to 5 wt%, preferably 0.01 to 1.5 wt%, more preferably 0.01 to 0.2 wt%, still more preferably 0.01 to 0.1 wt% (on an as-received basis) based on the total weight of the lubricating oil composition.
  • 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 and sulfolane-type seal swell agents such as Lubrizol 730-type seal swell additives.
  • Such additives may be used in an amount of 0.01 to 3 wt%, preferably 0.01 to 2 wt% on an as-received basis.
  • Antifoam agents may advantageously be added to lubricant compositions. These agents retard the formation of stable foams. Silicones and organic polymers are typical antifoam agents. For example, polysiloxanes, such as silicon oil or polydimethyl siloxane, provide antifoam properties. Antifoam agents are commercially available and may be used in conventional minor amounts along with other additives such as demulsifiers; usually the amount of these additives combined is less than 1 percent, preferably 0.001 to 0.5 wt%, more preferably 0.001 to 0.2 wt%, still more preferably 0.0001 to 0.15 wt% (on an as- received basis) based on the total weight of the lubricating oil composition.
  • Anti-rust additives are additives that protect lubricated metal surfaces against chemical attack by water or other contaminants.
  • One type of anti-rust additive is a polar compound that wets the metal surface preferentially, protecting it with a film of oil.
  • Another type of anti-rust additive absorbs water by incorporating it in a water-in-oil emulsion so that only the oil touches the surface.
  • Yet another type of anti-rust additive chemically adheres to the metal to produce a non-reactive surface.
  • suitable additives include zinc dithiophosphates, metal phenolates, basic metal sulfonates, fatty acids and amines. Such additives may be used in an amount of 0.01 to 5 wt%, preferably 0.01 to 1.5 wt% on an as-received basis.
  • anti-wear additives which are essential components of the present disclosure
  • other anti-wear additives can be present, including zinc dithiocarbamates, molybdenum dialkyldithiophosphates, molybdenum dithiocarbamates, other organo molybdenum-nitrogen complexes, sulfurized olefins, etc.
  • organo molybdenum-nitrogen complexes embraces the organo molybdenum-nitrogen complexes described in U.S. Patent 4,889,647.
  • the complexes are reaction products of a fatty oil, dithanolamine and a molybdenum source. Specific chemical structures have not been assigned to the complexes.
  • U.S. Patent 4,889,647 reports an infrared spectrum for a typical reaction product of that disclosure; the spectrum identifies an ester carbonyl band at 1740 cm "1 and an amide carbonyl band at 1620 cm "1 .
  • the fatty oils are glyceryl esters of higher fatty acids containing at least 12 carbon atoms up to 22 carbon atoms or more.
  • the molybdenum source is an oxygen-containing compound such as ammonium molybdates, molybdenum oxides and mixtures.
  • organo molybdenum complexes which can be used in the present disclosure are tri-nuclear molybdenum- sulfur compounds described in EP 1 040 1 15 and WO 99/31 1 13 and the molybdenum complexes described in U.S. Patent 4,978,464.
  • PCMO passingenger car motor oil
  • PCMO passingenger car motor oil formulations (1.1% ash) were prepared having the ingredients and the amounts listed in Table 1. The amounts are given in weight percent based on the total weight percent of the formulation.
  • DDI is a detergent-dispersant-inhibitor package containing detergents, dispersants, ZDDP, antioxidants, defoamant, and friction modifiers.
  • the isoprene star copolymer concentrate has a shear stability index (SSI) of 4.
  • the Group III base stock has a viscosity of 4 cSt and a viscosity index of 133.
  • the second Group III base stock has a viscosity of 6 cSt and a viscosity index of 146.
  • C 8 /Ci 0 TMP ester is a polyol ester API Group V base stock with a KV at 100°C of 4.4 cSt.
  • the olefin copolymer viscosity modifier (OCP VM) has a 50 SSI.
  • Lubrizol® 730 is an alkyl sulfone and sulfolane available from Lubrizol Corporation.
  • Vanlube® 289 is a mixture of borated alkyl diethanol amides and borated mono glycerides available from .T. Vanderbilt Company.
  • Hitec® 7188 is a sulfurized olefin available from Afton Corporation.
  • Hitec® 4313 is a thiadiazole derivative available from Afton Corporation.
  • the MB Seal Test raw data for PCMO formulations (1.1% ash) is set forth in Table 2.
  • a comparison of MB seal performance benefit vs. comparative example is set forth in Table 3.
  • the sulfated ash (%) was determined by D874 test method.
  • the data set forth in Tables 2 and 3 was generated by the Nitrile-NBR34 (MB VDA 675301 Method).
  • Tables 1, 2 and 3 show engine oil formulations where a 1.1% ash reference formulation is treated with different additives at relatively low concentrations. Different additive chemistries are shown which provide a significant improvement in MB NBR 34 nitrile seal performance in the areas of change in tensile strength (44-83%) and elongation at break (14-46%). These improvements in NBR 34 seal performance as measured by tensile strength and elongation at break are surprising and unexpected for the inventive formulations with respect to the prior art comparative example.
  • PCMO formulations (0.8% ash) were prepared having the ingredients and the amounts listed in Table 4. The amounts are given in weight percent based on the total weight percent of the formulation.
  • DDI is a detergent-dispersant- inhibitor package containing detergents, dispersants, ZDDP, antioxidants, defoamant, pour point depressant, and friction modifiers.
  • the isoprene star copolymer concentrate has a shear stability index (SSI) of 4.
  • the Group III base stock has a viscosity of 4 cSt and a viscosity index of 133.
  • the second Group III base stock has a viscosity of 6 cSt and a viscosity index of 146.
  • C 8 /Ci 0 TMP ester is a polyol ester API Group V base stock with a KV at 100°C of 4.4 cSt.
  • the olefin copolymer viscosity modifier (OCP VM) has a 50 SSI.
  • Vanlube® 289 is a mixture of borated alkyl diethanol amides and borated mono glycerides available from R.T. Vanderbilt Company.
  • Hitec® 7188 is a sulfurized olefin available from Afton Corporation. All of the ingredients are commercially available.
  • the MB Seal Test raw data for PCMO formulations (0.8% ash) is set forth in Table 5.
  • a comparison of MB seal performance benefit vs. comparative example is set forth in Table 6.
  • the sulfated ash (%) was determined by D874 test method.
  • the data set forth in Tables 5 and 6 was generated by the Nitrile-NBR34 (MB VDA 675301 Method).
  • Tables 4, 5 and 6 show engine formulations where a 0.8% ash reference formulation is treated with different additives at relatively low concentrations. Different additive chemistries are shown which provide a significant improvement in MB nitrile seal performance in the areas of change in tensile strength (47-60%) and elongation at break (15-23%). Again, these improvements in NBR 34 seal performance as measured by tensile strength and elongation at break are surprising and unexpected for the inventive formulations with respect to the prior art comparative example.
  • PCMO formulations (1.4% ash) were prepared having the ingredients and the amounts listed in Table 7. The amounts are given in weight percent based on the total weight percent of the formulation.
  • DDI is a detergent-dispersant- inhibitor package containing detergents, dispersants, ZDDP, antioxidants, defoamant, and friction modifier.
  • the isoprene star copolymer concentrate has a shear stability index (SSI) of 4.
  • the Group III base stock has a viscosity of 4 cSt and a viscosity index of 133.
  • the Group IV base stock has a viscosity of 5.8 cSt at 100°C and a viscosity index of 137.
  • C 8 /Ci 0 TMP ester is polyol ester API Group V base stock with a KV at 100°C of 4.4 cSt.
  • Hitec® 4313 is a thiadiazole derivative available from Afton Corporation. All of the ingredients are commercially available.
  • the ACEA RE-4 Seal Test raw data for PCMO formulations (1.4% ash) is set forth in Table 8.
  • a comparison of ACEA RE-4 seal performance benefit vs. comparative example is set forth in Table 9.
  • the sulfated ash (%) was determined by D874 test method.
  • the data set forth in Tables 8 and 9 was generated by the CEC L-39-96 elastomer test using the RE-4 nitrile elastomer.
  • Tables 7-1 1 show engine formulations where a 1.4% ash reference formulation is treated with a thiadiazole additive at a relatively low concentration (0.1%).
  • Table 9 shows a significant improvement in MB nitrile seal performance in the areas of change in tensile strength (103%) and elongation at break (45%).
  • Table 1 1 shows a significant improvement in MB NB 34 nitrile seal performance in the areas of change in tensile strength (96%) and elongation at break (37%). Again, these improvements in NBR 34 seal performance as measured by tensile strength and elongation at break are surprising and unexpected for the inventive formulations with respect to the prior art comparative example.

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

Abstract

La présente invention concerne une huile pour moteur lubrifiante et un procédé d'amélioration de la compatibilité d'un joint en nitrile avec une huile lubrifiante dans un moteur lubrifié avec une telle huile lubrifiante. Le procédé comprend l'utilisation en tant qu'huile lubrifiante d'une huile formulée comprenant une huile de base d'huile lubrifiante en tant que composant majeur et un ou plusieurs additifs choisis dans le groupe constitué de (i) une sulfone, un sulfolane, ou un dérivé de ceux-ci ; (ii) un ester de borate, un amide de bore, ou des mélanges de ceux-ci ; (iii) une oléfine sulfurisée ; (iv) un thiadiazole ou un dérivé de celui-ci ; et (v) un anhydride succinique ou un dérivé de celui-ci, en tant que composant mineur. La compatibilité avec un joint en nitrile est améliorée par rapport à la compatibilité avec un joint en nitrile obtenue en utilisant une huile lubrifiante contenant un composant mineur autre que les un ou plusieurs additifs.
EP13742580.7A 2012-08-06 2013-07-23 Procédé pour améliorer la compatibilité d'un joint en nitrile avec des huiles lubrifiantes Withdrawn EP2880137A1 (fr)

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PCT/US2013/051602 WO2014025525A1 (fr) 2012-08-06 2013-07-23 Procédé pour améliorer la compatibilité d'un joint en nitrile avec des huiles lubrifiantes

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JP2017132875A (ja) * 2016-01-27 2017-08-03 東燃ゼネラル石油株式会社 潤滑油組成物
WO2017205274A1 (fr) 2016-05-24 2017-11-30 The Lubrizol Corporation Agents gonflants de joints d'étanchéité pour compositions lubrifiantes
EP3380592B1 (fr) * 2016-05-24 2019-09-04 The Lubrizol Corporation Agents gonflants de joints d'étanchéité pour compositions lubrifiantes
JP6730122B2 (ja) * 2016-07-28 2020-07-29 Ｅｍｇルブリカンツ合同会社 潤滑油組成物
CN117701321B (zh) * 2022-09-06 2025-07-11 中国石油化工股份有限公司 改善橡胶相容性的欧vi国vi发动机油组合物及制备方法
CN117778081A (zh) * 2022-09-22 2024-03-29 中国石油化工股份有限公司 一种低温性能加强型低黏度自动变速箱油组合物及其应用
EP4368687B1 (fr) 2022-11-10 2025-06-25 Afton Chemical Corporation Inhibiteur de corrosion et lubrifiant industriel le comprenant

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US4973412A (en) * 1990-05-07 1990-11-27 Texaco Inc. Multifunctional lubricant additive with Viton seal capability
GB2280907B (en) * 1993-08-13 1997-04-30 Ethyl Petroleum Additives Ltd Motor oil compositions,additive concentrates for producing such motor oils,and the use thereof
EP0684298A3 (fr) * 1994-05-23 1996-04-03 Lubrizol Corp Compositions pour accroître la durée de conservation de joints d'étanchéité et des lubrifiants et fluides fonctionnels les contenant.
US5840672A (en) * 1997-07-17 1998-11-24 Ethyl Corporation Antioxidant system for lubrication base oils
US20070213235A1 (en) * 2002-07-29 2007-09-13 Saini Mandeep S Lubricant and additive formulation
US7727944B2 (en) * 2004-08-18 2010-06-01 The Lubrizol Corporation Lubricant compositions containing seal conditioning agents
US8299002B2 (en) * 2005-10-18 2012-10-30 Afton Chemical Corporation Additive composition

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