Classifications

• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M161/00—Lubricating compositions characterised by the additive being a mixture of a macromolecular compound and a non-macromolecular compound, each of these compounds being essential
• • 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
  • C10M141/00—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential
  • C10M141/10—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic phosphorus-containing compound
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M141/00—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential
  • C10M141/12—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic compound containing atoms of elements not provided for in groups C10M141/02 - C10M141/10
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
  • C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
  • C10M2203/102—Aliphatic fractions
  • C10M2203/1025—Aliphatic fractions used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
  • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
  • C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
  • C10M2205/0285—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
  • C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic 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
  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2215/22—Heterocyclic nitrogen compounds
  • C10M2215/221—Six-membered rings containing nitrogen 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
  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2215/26—Amines
• • 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
  • C10M2227/062—Cyclic esters
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/10—Inhibition of oxidation, e.g. anti-oxidants
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/12—Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
• • 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
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/52—Base number [TBN]
• • 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
  • C10N2040/08—Hydraulic fluids, e.g. brake-fluids
• • 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
  • C10N2040/12—Gas-turbines
• • 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
  • C10N2040/135—Steam engines or turbines
• • 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

Definitions

• the present invention generally relates to a lubricant composition that includes a base oil, a boroxine compound, and a sterically hindered amine compound.
• the invention also relates to an additive package for a lubricant composition.
• the present invention provides a lubricant composition including a base oil, a boroxine compound, and a sterically hindered amine compound.
• the boroxine compound has general formula
• each R 1 is independently an alkyl group having from 1 to 7 carbon atoms.
• the present invention provides a lubricant composition including a base oil, a boroxine compound, and a sterically hindered amine compound.
• the boroxine compound has general formula (I):
• each R 1 is independently an alkyl group having from 1 to 7 carbon atoms.
• the present invention is also directed to a lubricant composition including the base oil, the boroxine compound, and the sterically hindered amine compound having the general formula (II) or (III):
• each R 2 is independently a hydrogen atom or a hydrocarbyl group having from 1 to 17 carbon atoms, and wherein at least two groups designated by R 2 are an alkyl group; wherein each R 3 is independently a hydrogen atom or a hydrocarbyl group having from 1 to 17 carbon atoms; wherein each R 4 is independently a hydrogen atom or a hydrocarbyl group having from 1 to 17 carbon atoms, and wherein at least two groups designated by R 4 are an alkyl group; wherein each R 5 is independently a hydrogen atom or a hydrocarbyl group having from 1 to 17 carbon atoms, and wherein said hydrocarbyl groups designated by R 2 , R 3 , R 4 , and R 5 are each independently an alcohol group, an alkyl group, an amide group, an ether group or an ester group.
• the present invention also provides an additive package for a lubricant composition including the boroxine compound and the sterically hindered amine compound.
• Lubricant compositions including the boroxine compound demonstrate improved compatibility with fluoropolymer seals as demonstrated by CEC L-39-T96.
• a boroxine compound may be included in a lubricant composition or an additive package for a lubricant composition to improve the seal compatibility of the lubricant composition.
• the boroxine compound may be combined in the lubricant composition with one or more sterically hindered amine compounds.
• the boroxine compound interacts with these sterically hindered amine compounds so as to interfere with the tendency of the sterically hindered amine compound to negatively interact with a fluoropolymer seal as that lubricant composition contacts the fluoropolymer seal, without affecting the stabilizing effect of the sterically hindered amine compound.
• the boroxine compound has general formula (I):
• each R 1 is independently an alkyl group having equal to or fewer than 7 carbon atoms.
• each R 1 may independently be an alkyl group having from 1 to 7, 1 to 6, 1 to 5, 1 to 4, 1 to 3, or 1 to 2, carbon atoms.
• Each R 1 may independently be linear or branched.
• each R 1 may be a methyl group.
• Exemplary R 1 groups may independently include methyl, ethyl, n- propyl, iso-propyl, n-butyl, sec -butyl, tert-butyl, and n-hexyl groups.
• the boroxine compound may be exemplified by trimethoxy boroxine, tripropoxy boroxine, triisopropoxy boroxine, tributoxy boroxine, tripentoxy boroxine, trihexoxy boroxine, and triheptoxy boroxine.
• trimethoxy boroxine has the formula:
• each R 1 may represent distinct alkyl groups.
• the boroxine compound may be exemplified by the formula:
• R 1 in formula (I) is methyl
• one group designated by R 1 in formula (I) is ethyl
• one group designated by R 1 in formula (I) is propyl.
• groups designated by R 1 may be the same, and one group designated by R 1 may be different in formula (I).
• the boroxine compound may be included in the lubricant composition and/or additive package in an amount sufficient to provide a desired concentration of boron in the lubricant composition and/or additive package.
• the boroxine compound can be included in an amount sufficient to provide from 1 to 5000 ppm boron in the lubricant composition based the total weight of the lubricant composition.
• the boroxine compound may be included in an amount in the lubricant composition or additive package sufficient to provide from 100 to 5000, 300 to 3000, 500 to 1500, or 700 to 1200, ppm boron, in the lubricant composition based the total weight of the lubricant composition.
• the boroxine compound may be provided in an amount sufficient to provide from 1 to 100, 1 to 40, 1 to 20, or 10 to 20, ppm boron, in the lubricant composition based the total weight of the lubricant composition.
• the boroxine compound may be present in the lubricant composition in an amount ranging from 0.1 to 10, 0.1 to 5, 0.1 to 1, 0.3 to 0.7, 0.5 to 3, or 0.5 to 1.5, wt.%, based on the total weight of the lubricant composition.
• the boroxine compound is included in an amount greater than 1 wt.%, but less than 5 wt.%, based on the total weight of the lubricant composition. Mixtures of different boroxine compounds may also be used in combination in the lubricant composition or the additive package.
• the boroxine compound may be present in an amount ranging from 0.1 to 75 wt.% based on the total weight of the additive package.
• the boroxine compound may also be present in the additive package in an amount ranging from 0.1 to 50, 0.1 to 33, or 0.1 to 25, wt.%, based on the total weight of the additive package.
• the boroxine compound may be prepared via numerous methods.
• the boroxine compound can be prepared by reacting 2 mole of orthoboric acid (H 3 BO 3 ) with 1 mole tri-alkyl borate.
• the alkyl borate may have from 1 to 7 carbon atoms, depending on the number of carbon atoms desired in the groups designated by R 1 in general formula (I).
• the reaction can be conducted at a temperature ranging from 50 to 150 °C in order to remove 1 mol H 2 0.
• conventional boron compounds involve forming a reaction product between a conventional amine compound and a conventional boron compound.
• the conventional boron compound may be exemplified by reactive borate esters and boric acids.
• the conventional boron compound is consumed by chemical reactions such that the ultimately formed lubricant composition does not contain appreciable amounts of the conventional boron compound.
• the conventional amine compound is reacted with the conventional boron compound to form a salt.
• the salt formation is evidenced by the electronic impact upon the reaction of the conventional boron compound and the conventional amine compound, which is visible as a chemical shift in NMR spectroscopy.
• There are also physical indications that a reaction takes place such as the evolution of heat and the thickening of the solution (cross-linking).
• the inventive lubricant compositions, additive packages, and inventive methods may contain a significant amount of the boroxine compound in an unreacted state.
• the inventive lubricant compositions, inventive additive packages, and inventive methods do not involve the formation of a substantial amount of a salt of the boroxine compound.
• the lubricant composition may be free from a salt formed through the reaction of the boroxine compound, or may contain less than 10, less than 5, or less than 1, wt. , of the salt formed through the reaction of the boroxine compound based on the total weight of the lubricant composition after any reaction.
• At least 50, at least 60, at least 70, at least 80, or at least 90, wt.%, of the boroxine compound remains unreacted in the lubricant composition based on a total weight of boroxine compound utilized to form the lubricant composition prior to any reaction in the lubricant composition.
• at least 95, at least 96, at least 97, at least 98, or at least 99, wt.%, of the boroxine compound remains unreacted in the lubricant composition based on a total weight of the boroxine compound prior to any reaction in the lubricant composition.
• the term "unreacted” refers to the fact that the designated amount of the boroxine compound does not react with any components in the lubricant composition, such as the conventional amine compound or water. Accordingly, the unreacted amount of the boroxine compound remains in its virgin state when present in the lubricant composition before the lubricant composition has been used in an end-use application, such as an internal combustion engine.
• the phrase "prior to any reaction in the lubricant composition” refers to the basis of the amount of the boroxine compound in the lubricant composition. This description does not require that the boroxine compound reacts with other components in the lubricant composition, i.e., 100 wt.% of the boroxine compound may remain unreacted in the lubricant composition based on a total weight of the boroxine compound prior to any reaction in the lubricant composition.
• the percentage of the boroxine compound that remains unreacted is determined after all of the components which are present in the lubricant composition reach equilibrium with one another.
• the time period necessary to reach equilibrium in the lubricant composition may vary widely. For example, the amount of time necessary to reach equilibrium may range from a single minute to many days, or even weeks.
• the percentage of the boroxine compound that remains unreacted in the lubricant composition is determined after 1 minute, 1 hour, 5 hours, 12 hours, 1 day, 2 days, 3 days, 1 week, 1 month, 6 months, or 1 year. Generally, the percentage of the boroxine compound that remains unreacted in the lubricant composition is determined before an end use.
• the lubricant composition includes less than 0.1, less than 0.01, less than 0.001, or less than 0.0001, wt. , of compounds which would react with the boroxine compound based on the total weight of the lubricant composition.
• the lubricant composition may include a collective amount of acids, anhydrides, triazoles, and/or oxides which is less than 0.1 wt.%, of the total weight of the lubricant composition.
• the lubricant composition may include a collective amount of acids, anhydrides, triazoles, and/or oxides which is less than 0.01, less than 0.001, or less than 0.0001, wt.%, based on the total weight of the lubricant compositions.
• the lubricant composition may be free of acids, anhydrides, triazoles, and/or oxides.
• acids includes both traditional acids and Lewis acids.
• acids include carboxylic acids, such as lactic acid and hydracylic acid; alkylated succinic acids; alkylaromatic sulfonic acids; and fatty acids.
• exemplary Lewis acids include alkyl aluminates; alkyl titanates; molybdenumates, such as molybdenum thiocarbamates and molybdenum carbamates; and molybdenum sulfides.
• Triazoles are exemplified by benzotriazoles and derivatives thereof; tolutriazole and derivatives thereof; 2-mercaptobenzothiazole, 2,5-dimercaptothiadiazole, 4,4'- methylene-bis-benzotriazole, 4,5,6,7-tetrahydro-benzotriazole, and salts thereof.
• Oxides may be exemplified by alkylene oxides, such as ethylene oxide and propylene oxide; metal oxides; alkoxylated alcohols; or alkoxylated esters.
• the lubricant composition may include less than 100, less than 50, less than 10, or less than 5, ppm B(OH)3 ⁇ ions, based the total weight of the lubricant composition.
• Conventional boroxine compounds may be hydrolyzed before they are combined with a conventional lubricant composition such that more than 100 ppm B(OH)3 _ ions are present in the conventional lubricant composition. In such a hydrolyzed state, the inventors of the subject application surprisingly realized that the resultant conventional boroxine compounds do not provide the desired effect on seal compatibility. In other words, at least 50, at least 60, at least 70, at least 80, at least 90, at least 95, or at least 99, wt.
• the boroxine compound is in an unhydrolyzed state in the lubricant composition based on the total weight of the boroxine compound.
• the amount of the boroxine compound which is hydrolyzed is accounted for when determining the amount of the boroxine compound which remains unreacted.
• the boroxine compound does not negatively affect the total base number (TBN) of the lubricant composition.
• TBN value of the lubricant composition can be determined according to ASTM D2896 and ASTM D4739 as will be described below.
• the boroxine compound may be combined with at least one sterically hindered amine compound. It should be appreciated that mixtures of different sterically hindered amine compounds may also be combined with the boroxine compound.
• the lubricant composition includes the sterically hindered amine compound in an amount ranging from 0.1 to 25, 0.1 to 20, 0.1 to 15, or 0.1 to 10, wt.%, based on the total weight of the lubricant composition.
• the lubricant composition may comprise the sterically hindered amine compound in an amount ranging from 0.5 to 5, 1 to 3, 1 to 2, wt.%, based on the total weight of the lubricant composition.
• the sterically hindered amine compound does not substantially react with the boroxine compound to form a salt.
• the absence of salt formation is evidenced by the lack of a chemical shift in the NMR spectra of the boroxine compound and the sterically hindered amine compound when they are combined in the lubricant composition and/or additive package.
• at least 50, 60, 70, 80, 90, 95, or 99 wt.% of the sterically hindered amine compound remains unreacted after the lubricant composition and/or additive package reaches equilibrium.
• the basicity of the sterically hindered amine compound can be determined by acid titration.
• the resulting neutralization number is expressed as the TBN, and can be measured using various methods.
• ASTM D4739 is a potentiometric hydrochloric acid titration.
• the ASTM D4739 method is favored in engine tests and with used oils to measure TBN depletion/retention. When testing used engine lubricants, it should be recognized that certain weak bases are the result of the service rather than having been built into the oil. This test method can be used to indicate relative changes that occur in lubricant composition during use under oxidizing or other service conditions regardless of the color or other properties of the resulting lubricant composition.
• the sterically hindered amine compound may have a TBN value of at least 70 mg KOH/g when tested according to ASTM D4739.
• the sterically hindered amine compound may have a TBN value of at least 80, at least 90, at least 100, at least 110, at least 120, at least 130, at least 140, at least 150, or at least 160, mg KOH/g, when tested according to ASTM D4739.
• the additive package includes the sterically hindered amine compound in an amount ranging from 0.1 to 50 wt. , based on the total weight of the additive package.
• the additive package may comprise the sterically hindered amine compound in 1 to 25, 0.1 to 15, 1 to 10, 0.1 to 8, or 1 to 5, wt.%, based on the total weight of the additive package. Combinations of various sterically hindered amine compounds are also contemplated.
• the sterically hindered amine compound includes at least one nitrogen atom. In other embodiments, the sterically hindered amine compound does not include triazoles, triazines, or similar compounds where there are three or more nitrogens in the body of a cyclic ring.
• the sterically hindered amine compound may consist of, or consist essentially of, hydrogen, carbon, nitrogen, and oxygen.
• the sterically hindered amine compound may consist of, or consist essentially of, hydrogen, carbon, and nitrogen.
• the phrase "consist essentially of refers to compounds where at least 95 mole% of the sterically hindered amine compound are the recited atoms (i.e., hydrogen, carbon, nitrogen, and oxygen; or hydrogen, carbon, and nitrogen).
• the sterically hindered amine compound consists essentially of hydrogen, carbon, nitrogen, and oxygen
• at least 95 mole% of the sterically hindered amine compound is hydrogen, carbon, nitrogen, and oxygen.
• at least 96, at least 97, at least 98, at least 99, or at least 99.9, mole%, of the sterically hindered amine compound are hydrogen, carbon, nitrogen and oxygen, or, in other embodiments, are carbon, nitrogen, and hydrogen.
• the sterically hindered amine compound may consist of covalent bonds.
• the phrase "consist of covalent bonds" is intended to exclude those compounds which bond to the sterically hindered amine compound through an ionic association with one or more ionic atoms or compounds. That is, in configurations where the sterically hindered amine compound consists of covalent bonds, the sterically hindered amine compound excludes salts of sterically hindered amine compounds, such as phosphate amine salts and amine salts.
• the lubricant composition is free of a salt of the sterically hindered amine compound. More specifically, the lubricant composition may be free of a phosphate amine salt, amine salt and/or sulfate amine salt.
• the sterically hindered amine compound may have a weight average molecular weight ranging from 100 to 1200.
• the sterically hindered amine compound may have a weight average molecular weight ranging from 200 to 800, or from 200 to 600.
• the sterically hindered amine compound may have a weight average molecular weight of less than 500.
• the term "sterically hindered amine compound” means an organic molecule having fewer than two hydrogen atoms bonded to at least one alpha- carbon with reference to a secondary or tertiary nitrogen atom. In other embodiments, the term “sterically hindered amine compound” means an organic molecule having no hydrogen atoms bonded to at least one alpha-carbon with reference to a secondary or tertiary nitrogen atom. In still other embodiments, the term “sterically hindered amine compound” means an organic molecule having no hydrogen atoms bonded to each of at least two alpha-carbons with reference to a secondary or tertiary nitrogen atom.
• the sterically hindered amine compound may have general formula (II) or (HI):
• each R 2 is independently a hydrogen atom or a hydrocarbyl group having from 1 to 17 carbon atoms, wherein at least two of R 2 are an alkyl group in one molecule; and R 3 is independently a hydrogen atom or a hydrocarbyl group having from 1 to 17 carbon atoms.
• each R 4 is independently a hydrogen atom or a hydrocarbyl group having from 1 to 17 carbon atoms, wherein at least two of R 4 are an alkyl group, and each R 5 is independently a hydrogen atom or a hydrocarbyl group having from 1 to 17 carbon atoms.
• Each R 2 , R 3 , R 4 , and R 5 may independently be an alcohol group, an alkyl group, an amide group, an ether group, or an ester group. Each R 2 , R 3 , R 4 , and R 5 may independently have from 1 to 17, 1 to 15, 1 to 12, 1 to 8, 1 to 6, or 1 to 4, carbon atoms. Each group designated by R 2 , R 3 , R 4 , and R 5 may independently be straight or branched.
• each R 2 , R 3 , R 4 , and R 5 may be an alcohol group, amino group, alkyl group, amide group, ether group, or ester group having 1 to 17 carbon atoms, with the designated functional group (alcohol, etc) bonded at various positions on the carbon chain.
• At least one group designated by R 2 , R 3 , R 4 , and R 5 is unsubstituted.
• at least two, three, four, five, or six groups designated by R 2 , R 3 , R 4 , and R 5 are unsubstituted.
• unsubstituted it is intended that the designated group is free from pendant functional groups, such as hydroxyl, carboxyl, oxide, thio, and thiol groups, and that the designated group is free from acyclic heteroatoms, such as oxygen, sulfur, and nitrogen heteroatoms.
• every group designated by R 2 , R 3 , R 4 , and R 5 is unsubstituted.
• R 2 , R 3 , R 4 , and R 5 are substituted.
• substituted indicates that the designated group includes at least one pendant functional group, or that the designated group includes at least one acyclic heteroatom.
• Exemplary R 2 , R 3 , R 4 , and R 5 groups may be independently selected from methyl, ethyl, n-propyl, n-butyl, sec-butyl, tert-butyl, n-hexyl, n-octyl, 2-ethylhexyl, n-nonyl, n-decyl, n-undecyl, n-dodecyl, n-tridecyl, n-tetradecyl, n-hexadecyl, or n- octadecyl.
• At least two, at least three, or all four groups, designated by R 2 are independently an alkyl group.
• at least two groups designated by R 4 are an alkyl group.
• at least three, or all four groups, designated by R 4 are an alkyl group.
• the sterically hindered amine compound of general formula (II) may be exemplified by the following compounds:
• the sterically hindered amine compound of general formula (III) is acyclic.
• the term "acyclic” is intended to mean that the sterically hindered amine compound of general formula (III) is free from any cyclic structures and aromatic structures.
• the sterically hindered amine compound of general formula (III) can be exemplified by:
• the sterically hindered amine compound may further alternatively be exemplified by the general formula (IV):
• each R 2 and R 3 are as described above, wherein at least three of R 2 are independently an alkyl group.
• the sterically hindered amine compound of general formula (IV) may be exemplified by the following compounds:
• the sterically hindered amine compound may include a single ester group. However, the sterically hindered amine compound may alternatively be free from ester groups. In certain embodiments, the sterically hindered amine compound may include at least one, or only one, piperidine ring.
• the boroxine compound and the sterically hindered amine compound may be provided in an amount such that 1 part of boron is provided for every 1 to 20 parts nitrogen in the sterically hindered amine compound within the lubricant composition.
• the boroxine compound and the sterically hindered amine compound may be provided in an amount such that 1 part of boron is provided for every 1 to 15, 1 to 10, or 1 to 5, parts nitrogen, in the sterically hindered amine compound within the lubricant composition.
• the lubricant composition may consist, or consist essentially of, a base oil, the boroxine compound, and the sterically hindered amine compound. It is also contemplated that the lubricant composition may consist of, or consist essentially of, the base oil, the boroxine compound, and the sterically hindered amine compound, in addition to one or more of additives that do not materially affect the functionality or performance of the boroxine compound.
• compounds that materially affect the overall performance of the lubricant composition may include compounds which negatively impact the TBN boost, the lubricity, the fluoropolymer seal compatibility, the corrosion inhibition, or the acidity of the lubricant composition.
• the additive package may consist, or consist essentially of, the boroxine compound and the sterically hindered amine compound. It is also contemplated that the additive package may consist of, or consist essentially of, the boroxine compound, and the sterically hindered amine compound in addition to one or more of additives that do not compromise the functionality or performance of the boroxine compound.
• the term "consisting essentially of” describes the additive package being free of compounds that materially affect the overall performance of the lubricant composition.
• compounds that materially affect the overall performance of the additive package may include compounds which negatively impact the TBN boost, the lubricity, the fluoropolymer seal compatibility, the corrosion inhibition, or the acidity of the additive package.
• the lubricant composition includes a base oil.
• the base oil is classified in accordance with the American Petroleum Institute (API) Base Oil Interchangeability Guidelines.
• the base oil may be further described as one or more of five types of base oils: Group I (sulphur content >0.03 wt. , and/or ⁇ 90 wt. , saturates, viscosity index 80-119); Group II (sulphur content less than or equal to 0.03 wt. , and greater than or equal to 90 wt. , saturates, viscosity index 80-119); Group III (sulphur content less than or equal to 0.03 wt. , and greater than or equal to 90 wt. , saturates, viscosity index greater than or equal to 119); Group IV (all polyalphaolefins (PAO's)); and Group V (all others not included in Groups I, II, III, or IV).
• PAO's polyalphaolefins
• the base oil is selected from the group of API Group I base oils; API Group II base oils; API Group III base oils; API Group IV base oils; API Group V base oils; and combinations thereof.
• the base oil includes API Group II base oils.
• the base oil may have a viscosity ranging from 1 to 20 cSt when tested according to ASTM D445 at 100°C. Alternatively, the viscosity of the base oil may range from 3 to 17, or 5 to 14, cSt, when tested according to ASTM D445 at 100°C.
• the base oil may be further defined as a crankcase lubrication oil for spark- ignited and compression-ignited internal combustion engines, including automobile and truck engines, two-cycle engines, aviation piston engines, marine engines, and railroad diesel engines.
• the base oil can be further defined as an oil to be used in gas engines, diesel engines, stationary power engines, and turbines.
• the base oil may be further defined as heavy or light duty engine oil.
• the base oil may be further defined as synthetic oil that includes one or more alkylene oxide polymers and interpolymers, and derivatives thereof.
• the terminal hydroxyl groups of the alkylene oxide polymers may be modified by esterification, etherification, or similar reactions.
• These synthetic oils may be prepared through polymerization of ethylene oxide or propylene oxide to form polyoxyalkylene polymers which can be further reacted to form the synthetic oil.
• alkyl and aryl ethers of these polyoxyalkylene polymers may be used.
• one or more of the components described herein are blended into the additive package that is subsequently blended into the base oil to make the lubricant composition.
• the additive package may be formulated to provide the desired concentration in the lubricant composition when the concentrate is combined with a predetermined amount of base oil. It is to be appreciated that most references to the lubricant composition throughout this disclosure also apply to the description of the additive package. For example, it is to be appreciated that the additive package may include, or exclude the same components as the lubricant composition, albeit in different amounts.
• the base oil may be present in the lubricant composition in an amount ranging from 50 to 99.9, 60 to 99.9, 70 to 99.9, 80 to 99.9, 90 to 99.9, 75 to 95, 80 to 90, or 85 to 95, wt.%, based on the total weight of the lubricant composition.
• the base oil may be present in the lubricant composition in amounts of greater than 50, 60, 70, 75, 80, 85, 90, 95, 98, or 99, wt.%, based on the total weight of the lubricant composition.
• the amount of base oil in a fully formulated lubricant composition ranges from 50 to 99, 60 to 90, 80 to 99.5, 85 to 96, or 90 to 95, wt.%, based on the total weight of the lubricant composition.
• the amount of base oil in a additive package, if included, ranges from 0.1 to 50, 1 to 25, or 1 to 15, wt.%, based on the total weight of the additive package.
• the lubricant composition may be classified as a low SAPS lubricant having a sulfated ash content of no more than 3, 2, 1, or 0.5, wt.%, based on the total weight of the lubricant composition.
• SAPS refers to sulfated ash, phosphorous, and sulfur.
• the lubricant composition may have a TBN value of at least 1 mg KOH/g of lubricant composition.
• the lubricant composition has a TBN value ranging from 1 to 15, 5 to 15, or 9 to 12, mg KOH/g of lubricant composition, when tested according to ASTM D2896.
• the lubricant composition or the additive package may further include a dispersant in addition to the boroxine compound and/or the sterically hindered amine compound.
• the dispersant may be a polyalkene amine.
• the polyalkene amine includes a polyalkene moiety.
• the polyalkene moiety is the polymerization product of identical or different, straight-chain or branched C 2 -6 olefin monomers. Examples of suitable olefin monomers are ethylene, propylene, 1-butene, isobutene, 1-pentene, 2-methyl butene, 1-hexene, 2-methylpentene, 3-methylpentene, and 4-methylpentene.
• the polyalkene moiety has a weight average molecular weight of ranging from 200 to 10000, 500 to 10000, or 800 to 5000.
• the polyalkene amine is derived from polyisobutenes.
• Particularly suitable polysiobutenes are known as "highly reactive'" polyisobutenes which feature a high content of terminal double bonds.
• Terminal double bonds are alpha-olefinic double bonds of the type shown in general formula (V): polymer
• Suitable highly reactive polypolyisobutenes are, for example, polyisobutenes which have a fraction of vinylidene double bonds of greater than 70, 80, 85, mole . Preference is given in particular to polyisobutenes which have uniform polymer frameworks. Uniform polymer frameworks have in particular those polyisobutenes which are composed of at least 85, 90, or 95, wt. , of isobutene units. Such highly reactive polyisobutenes preferably have a number-average molecular weight in the abovementioned range.
• the highly reactive polyisobutenes may have a polydispersity ranging from 1.05 to 7, or 1.1 to 2.5.
• the highly reactive polyisobutenes may have a polydispersity less than 1.9, or less than 1.5.
• Polydispersity refers to the quotients of weight-average molecular weight Mw divided by the number-average molecular weight Mn.
• the amine dispersant may include moieties derived from succinic anhydride and having hydroxyl and/or amino and/or amido and/or imido groups.
• the dispersant may be derived from polyisobutenylsuccinic anhydride which is obtainable by reacting conventional or highly reactive polyisobutene having a weight average molecular weight ranging from 500 to 5000 with maleic anhydride by a thermal route or via the chlorinated polyisobutene.
• derivatives with aliphatic poly amines such as ethylenediamine, diethylenetriamine, triethylenetetramine or tetraethylenepentamine may be used.
• the polyalkene component may be aminated in a known manner.
• An exemplary process proceeds via the preparation of an oxo intermediate by hydroformylation and subsequent reductive amination in the presence of a suitable nitrogen compound.
• the dispersant may be a poly(oxyalkyl) radical or a polyalkylene polyamine radical of the general formula (VI): R 6 — NH— (Ci-C 6 -alkylene-NH) m — C C 6 -alkylene (VI)
• R 6 is a hydrogen atom or a hydrocarbyl group having from 1 to 6 carbon atoms with Ci-C 6 alkylene representing the corresponding bridged analogs of the alkyl radicals.
• the dispersant may also be a polyalkylene imine radical composed of from 1 to 10 CrC 4 alkylene imine groups; or, together with the nitrogen atom to which they are bonded, are an optionally substituted 5- to 7-membered heterocyclic ring which is optionally substituted by one to three CrC 4 alkyl radicals and optionally bears one further ring heteroatom such as oxygen or nitrogen.
• alkenyl radicals include mono- or polyunsaturated, preferably mono- or diunsaturated analogs of alkyl radicals has from 2 to 18 carbon atoms, in which the double bonds may be in any position in the hydrocarbon chain.
• C4-C18 cycloalkyl radical examples include cyclobutyl, cyclopentyl and cyclohexyl, and also the analogs thereof substituted by 1 to 3 C1-C4 alkyl radicals.
• the C1-C4 alkyl radicals are, for example, selected from methyl, ethyl, iso- or n- propyl, n-, iso-, sec- or tert-butyl.
• arylalkyl radical examples include a Ci-Cis alkyl group and an aryl group which are derived from a monocyclic or bicyclic fused or nonfused 4- to 7- membered, in particular 6 membered, aromatic or heteroaromatic group, such as phenyl, pyridyl, naphthyl and biphenyl.
• dispersants can be of various types. Suitable examples of dispersants include polybutenylsuccinic amides or -imides, polybutenylphosphonic acid derivatives and basic magnesium, calcium and barium sulfonates and phenolates, succinate esters and alkylphenol amines (Mannich bases), and combinations thereof.
• the dispersant can be used in various amounts.
• the dispersant is typically present in the lubricant composition in an amount ranging from 0.01 to 15, 0.1 to 12, 0.5 to 10, or 1 to 8, wt.%, based on the total weight of the lubricant composition.
• the dispersant may be present in amounts of less than 15, less than 12, less than 10, less than 5, or less than 1, wt.%, each based on the total weight of the lubricant composition.
• the total weight of the dispersant and the boroxine compound may be less than 50, less than 45, less than 40, less than 35, or less than 30, wt. , of the additive package based on the total weight of the additive package.
• the combined concentration of the dispersant and boroxine compound is too high in the additive package, a reaction will take place between the dispersant and the boroxine compound which causes thickening and formation of a precipitate, along with a decrease in fluropolymer seal compatibility of the lubricant composition.
• the lubricant composition or the additive package may further comprise a dihydrocarbyldithiophosphate salt.
• the dihydrocarbyldithiophosphate salt may be represented by the following general formula: [R 7 0(R 8 0)PS(S)] 2 M, where R 7 and R 8 are each hydrocarbyl groups having from 1 to 20 carbon atoms, wherein M is a metal atom or an ammonium group.
• R 7 and R 8 may each independently be Ci_ 20 alkyl groups, C2-20 alkenyl groups, C3-20 cycloalkyl groups, Ci-20 aralkyl groups or C3-20 aryl groups.
• the groups designated by R 7 and R 8 may be substituted or unsubstituted.
• the metal atom may be selected from the group including aluminum, lead, tin, manganese, cobalt, nickel, or zinc.
• the ammonium group may be derived from ammonia or a primary, secondary, or tertiary amine.
• the ammonium group may be of the formula R 9 R 10 R n R 12 N + , wherein R 9 , R 10 , R 11 , and R 12 each independently represents a hydrogen atom or a hydrocarbyl group having from 1 to 150 carbon atoms.
• R 9 , R 10 , R 11 , and R 12 may each independently be hydrocarbyl groups having from 4 to 30 carbon atoms.
• the dihydrocarbyldithiophosphate salt is zinc dialkyl dithiophosphate.
• the dihydrocarbyldithiophosphate salt can be present in the lubricant composition in an amount ranging from 0.1 to 20, 0.5 to 15, 1 to 10, 0.1 to 5, 0.1 to 1, 0.1 to 0.5, or 0.1 to 1.5, wt.%, each based on the total weight of the lubricant composition.
• the dihydrocarbyldithiophosphate salt may be present in amounts of less than 20, less than 10, less than 5, less than 1, less than 0.5, or less than 0.1, wt.%, each based on the total weight of the lubricant composition.
• the additive package may also include the dihydrocarbyldithiophosphate salt in an amount ranging from 0.1 to 20, 0.5 to 15, 1 to 10, 0.1 to 5, 0.1 to 1, 0.1 to 0.5, or 0.1 to 1.5, wt.%, each based on the total weight of the additive package.
• the lubricant composition or the additive package may additionally include one or more additives to improve various chemical and/or physical properties of the lubricant composition.
• additives may be in addition to the boroxine compound or in addition to the combination of the boroxine compound and the sterically hindered amine compound.
• Specific examples of the one or more additives include anti-wear additives, antioxidants, metal deactivators (or passivators), rust inhibitors, viscosity index improvers, pour point depressors, dispersants, detergents, and antifriction additives.
• Each of the additives may be used alone or in combination.
• the one or more additives can be used in various amounts, if employed.
• the lubricant composition may be formulated with the addition of several auxiliary components to achieve certain performance objectives for use in certain applications.
• the lubricant composition may be a rust and oxidation lubricant formulation, a hydraulic lubricant formulation, turbine lubricant oil, and an internal combustion engine lubricant formulation.
• the base oil may be formulated to achieve these objectives as discussed below.
• the anti-wear additive can be of various types.
• the anti-wear additive may include sulfur- and/or phosphorus- and/or halogen-containing compounds, e.g., sulfurised olefins and vegetable oils, alkylated triphenyl phosphates, tritolyl phosphate, tricresyl phosphate, chlorinated paraffins, alkyl and aryl di- and disulfides, amine salts of mono- and dialkyl phosphates, amine salts of methylphosphonic acid, diethanolaminomethyltolyltriazole, bis(2- ethylhexyl)aminomethyltolyltriazole, derivatives of 2,5-dimercapto-l,3,4-thiadiazole, ethyl 3-[(diisopropoxyphosphinothioyl)thio]propionate, triphenyl thiophosphate (triphenylphosphorothioate), tris(
• the anti-wear additive can be used in various amounts.
• the anti- wear additive may be present in the lubricant composition in an amount ranging from 0.1 to 20, 0.5 to 15, 1 to 10, 0.1 to 1, 0.1 to 0.5, or 0.1 to 1.5, wt.%, each based on the total weight of the lubricant composition.
• the anti-wear additive may be present in amounts of less than 20, less than 10, less than 5, less than 1, less than 0.5, or less than 0.1, wt.%, each based on the total weight of the lubricant composition.
• the antioxidant can be of various types. Suitable antioxidants include alkylated monophenols, for example 2,6-di-tert-butyl-4-methylphenol, 2-tert- butyl-4,6-dimethylphenol, 2,6-di-tert-butyl-4-ethylphenol, 2,6-di-tert-butyl-4-n- butylphenol, 2,6-di-tert-butyl-4-isobutylphenol, 2,6-dicyclopentyl-4-methylphenol, 2- (a-methylcyclohexyl)-4,6-dimethylphenol, 2,6-dioctadecyl-4-methylphenol, 2,4,6- tricyclohexylphenol, 2,6-di-tert-butyl-4-methoxymethylphenol, 2,6-di-nonyl-4- methylphenol, 2,4-dimethyl-6( -methylundec-l'-yl)phenol, 2,4-dimethyl-6( -
• suitable antioxidants includes alkylthiomethylphenols, for example 2,4-dioctylthiomethyl-6-tert-butylphenol, 2,4-dioctylthiomethyl-6- methylphenol, 2,4-dioctylthiomethyl-6-ethylphenol, 2,6-didodecylthiomethyl-4- nonylphenol, and combinations thereof.
• Hydroquinones and alkylated hydroquinones for example 2,6-di-tert-butyl-4-methoxyphenol, 2,5-di-tert- butylhydroquinone, 2,5-di-tert-amylhydroquinone, 2,6-diphenyl-4- octadecyloxyphenol, 2,6-di-tert-butylhydroquinone, 2,5-di-tert-butyl-4- hydroxyanisole, 3 ,5-di-tert-butyl-4-hydroxyanisole, 3 ,5-di-tert-butyl-4-hydroxyphenyl stearate, bis-(3,5-di-tert-butyl-4-hydroxyphenyl) adipate, and combinations thereof, may also be utilized.
• hydroxylated thiodiphenyl ethers for example 2,2'-thiobis(6-tert- butyl-4-methylphenol), 2,2'-thiobis(4-octylphenol), 4,4'-thiobis(6-tert-butyl-3- methylphenol), 4,4'-thiobis(6-tert-butyl-2-methylphenol), 4,4'-thiobis-(3,6-di-sec- amylphenol), 4,4'-bis-(2,6-dimethyl-4-hydroxyphenyl) disulfide, and combinations thereof, may also be used.
• 2,2'-thiobis(6-tert- butyl-4-methylphenol 2,2'-thiobis(4-octylphenol), 4,4'-thiobis(6-tert-butyl-3- methylphenol), 4,4'-thiobis(6-tert-butyl-2-methylphenol), 4,4'-thiobis-(3,6-di-sec- amy
• alkylidenebisphenols for example 2,2'- methylenebis(6-tert-butyl-4-methylphenol), 2,2'-methylenebis(6-tert-butyl-4- ethylphenol), 2,2'-methylenebis[4-methyl-6-(a-methylcyclohexyl)phenol], 2,2'- methylenebis(4-methyl-6-cyclohexylphenol), 2,2'-methylenebis(6-nonyl-4- methylphenol), 2,2'-methylenebis(4,6-di-tert-butylphenol), 2,2'-ethylidenebis (4,6-di- tert-butylphenol), 2,2'-ethylidenebis(6-tert-butyl-4-isobutylphenol), 2,2'-methylenebis [6-(a-methylbenzyl)-4-nonylphenol], 2,2'-methylenebis[6-(a,a,a
• 0-, N- and S-benzyl compounds for example 3,5,3',5'-tetra-tert-butyl-4,4'- dihydroxydibenzyl ether, octadecyl-4-hydroxy-3 ,5-dimethylbenzylmercaptoacetate, tris-(3,5-di-tert-butyl-4-hydroxybenzyl)amine, bis(4-tert-butyl-3-hydroxy-2,6- dimethylbenzyl)dithiol terephthalate, bis(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, isooctyl-3,5di-tert-butyl-4-hydroxy benzylmercaptoacetate, and combinations thereof, may also be utilized.
• Hydroxybenzylated malonates for example dioctadecyl-2,2-bis-(3,5-di-tert- butyl-2-hydroxybenzyl)-malonate, di-octadecyl-2-(3-tert-butyl-4-hydroxy-5- methylbenzyl)-malonate, di-dodecylmercaptoethyl-2,2-bis-(3,5-di-tert-butyl-4- hydroxybenzyl)malonate, bis [4-(l,l,3,3-tetramethylbutyl)phenyl]-2,2-bis(3,5-di-tert- butyl-4-hydroxybenzyl)malonate, and combinations thereof are also suitable for use as antioxidants.
• Triazine compounds for example 2,4-bis(octylmercapto)-6-(3,5-di-tert-butyl- 4-hydroxyanilino)-l,3,5-triazine, 2-octylmercapto-4,6-bis(3,5-di-tert-butyl-4- hydroxyanilino)-l,3,5-triazine, 2-octylmercapto-4,6-bis(3,5-di-tert-butyl-4- hydroxyphenoxy)-l,3,5-triazine, 2,4,6-tris(3,5-di-tert-butyl-4-hydroxyphenoxy)-l,2,3- triazine, l,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate, l,3,5-tris(4-tert- butyl-3-hydroxy-2,6-dimethylbenzyl 2,4,6
• antioxidants include aromatic hydroxybenzyl compounds, for example, l,3,5-tris-(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6- trimethylbenzene, l,4-bis(3,5-di-tert-butyl-4-hydroxybenzyl)-2,3,5,6- tetramethylbenzene, 2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)phenol, and combinations thereof.
• aromatic hydroxybenzyl compounds for example, l,3,5-tris-(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6- trimethylbenzene, l,4-bis(3,5-di-tert-butyl-4-hydroxybenzyl)-2,3,5,6- tetramethylbenzene, 2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)phenol, and combinations thereof.
• Benzylphosphonates for example dimethyl-2,5-di-tert-butyl-4- hydroxybenzylphosphonate, diethyl-3,5-di-tert-butyl-4-hydroxybenzylphosphonate, dioctadecyl3,5-di-tert-butyl-4-hydroxybenzylphosphonate, dioctadecyl-5-tert-butyl-4- hydroxy3-methylbenzylphosphonate, the calcium salt of the monoethyl ester of 3,5- di-tert-butyl-4-hydroxybenzylphosphonic acid, and combinations thereof, may also be utilized.
• acylaminophenols for example 4-hydroxylauranilide, 4- hydroxystearanilide, and octyl N-(3,5-di-tert-butyl-4-hydroxyphenyl)carbamate.
• Esters of [3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid with mono- or polyhydric alcohols e.g. with methanol, ethanol, octadecanol, 1 ,6-hexanediol, 1,9- nonanediol, ethylene glycol, 1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris(hydroxyethyl) isocyanurate, N,N'-bis(hydroxyethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl- 1 -phospha-2,6,7- trioxabicyclo[2.2.2]octane, and combinations thereof, may also be used
• esters of -(5-tert-butyl-4-hydroxy-3-methylphenyl)-propionic acid with mono- or polyhydric alcohols e.g. with methanol, ethanol, octadecanol, 1,6- hexanediol, 1,9-nonanediol, ethylene glycol, 1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris (hydroxy ethyl) isocyanurate, N,N'-bis(hydroxyethyl)oxamide, 3-thiaundecanol, 3- thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl- 1- phospha-2,6,7-trioxabicyclo[2.2.2]octane, and combinations thereof,
• suitable antioxidants include those that include nitrogen, such as amides of -(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid, e.g., N,N'-bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)hexamethylenediamine, ⁇ , ⁇ '- bis(3,5-di-tert-butyl-4-hydroxyphenyl-propionyl)trimethylenediamine, N,N'-bis(3,5- di-tert-butyl-4-hydroxyphenylpropionyl)hydrazine.
• nitrogen such as amides of -(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid, e.g., N,N'-bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)hexamethylenediamine, ⁇ , ⁇ '- bis(3,5-di-tert
• antioxidants include aminic antioxidants such as N,N'-diisopropyl-p- phenylenediamine, N,N'-di-sec-butyl-p-phenylenediamine, N,N'-bis (1,4- dimethylpentyl)-p-phenylenediamine, N,N'-bis(l-ethyl-3-methylpentyl)-p- phenylenediamine, N,N'-bis(l-methylheptyl)-p-phenylenediamine, ⁇ , ⁇ '- dicyclohexyl-p-phenylenediamine, N,N'-diphenyl-p-phenylenediamine, N,N'-bis(2- naphthyl)-p-phenylenediamine, N-isopropyl-N'-phenyl-p-phenylenediamine, N-( 1,3- dimethyl-butyl)-N'-phenyl-
• antioxidants include aliphatic or aromatic phosphites, esters of thiodipropionic acid or of thiodiacetic acid, or salts of dithiocarbamic or dithiophosphoric acid, 2,2,12,12-tetramethyl-5,9-dihydroxy- 3,7,ltrithiatridecane and 2,2,15,15- tetramethyl-5,12-dihydroxy-3,7, 10,14- tetrathiahexadecane, and combinations thereof.
• sulfurized fatty esters, sulfurized fats and sulfurized olefins, and combinations thereof may be used.
• the antioxidant can be used in various amounts.
• the antioxidant may be present in the lubricant composition in an amount ranging from 0.01 to 5, 0.1 to 3, or 0.5 to 2, wt. , based on the total weight of the lubricant composition.
• the antioxidant may be present in amounts of less than 5, less than 3, or less than 2, wt.%, based on the total weight of the lubricant composition.
• the metal deactivator can be of various types. Suitable metal deactivators include benzotriazoles and derivatives thereof, for example 4- or 5 alkylbenzotriazoles (e.g.
• tolutriazole and derivatives thereof, 4,5,6,7- tetrahydrobenzotriazole and 5,5'-methylenebisbenzotriazole; Mannich bases of benzotriazole or tolutriazole, e.g. l-[bis(2-ethylhexyl)aminomethyl)tolutriazole and 1- [bis(2-ethylhexyl)aminomethyl)benzotriazole; and alkoxyalkylbenzotriazoles such as
• suitable metal deactivators include 1 ,2,4-triazoles and derivatives thereof, and Mannich bases of 1,2,4-triazoles, such as l-[bis(2- ethylhexyl)aminomethyl-l,2,4-triazole; alkoxyalkyl- 1,2,4-triazoles such as 1-(1- butoxyethyl)-l,2,4-triazole; and acylated 3-amino- 1,2,4-triazoles, imidazole derivatives, for example 4,4'-methylenebis(2-undecyl-5-methylimidazole) and bis[(N- methyl)imidazol-2-yl]carbinol octyl ether, and combinations thereof.
• 1,2,4-triazoles such as l-[bis(2- ethylhexyl)aminomethyl-l,2,4-triazole; alkoxyalkyl- 1,2,4-triazoles such as 1-(1- butoxyethy
• suitable metal deactivators include sulfur-containing heterocyclic compounds, for example 2-mercaptobenzothiazole, 2,5-dimercapto-l,3,4-thiadiazole and derivatives thereof; and 3,5-bis[di(2-ethylhexyl)aminomethyl]-l,3,4-thiadiazolin-
• metal deactivators include amino compounds, for example salicylidenepropylenediamine, salicylaminoguanidine and salts thereof, and combinations thereof.
• the metal deactivator can be used in various amounts.
• the metal deactivator may be present in the lubricant composition in an amount ranging from 0.01 to 0.1, 0.05 to 0.01, or 0.07 to 0.1, wt.%, based on the total weight of the lubricant composition.
• the metal deactivator may be present in amounts of less than 1.0, less than 0.7, or less than 0.5, wt.%, based on the total weight of the lubricant composition.
• the rust inhibitor and/or friction modifier can be of various types. Suitable examples of rust inhibitors and/or friction modifiers include organic acids, their esters, metal salts, for example alkyl- and alkenylsuccinic acids and their partial esters with alcohols, diols or hydroxycarboxylic acids, partial amides of alkyl- and alkenylsuccinic acids, 4-nonylphenoxyacetic acid, alkoxy- and alkoxyethoxycarboxylic acids such as dodecyloxyacetic acid, dodecyloxy(ethoxy)acetic acid, and also N-oleoylsarcosine, sorbitan monooleate, lead naphthenate, alkenylsuccinic anhydrides, for example, dodecenylsuccinic anhydride, 2-carboxymethyl-l-dodecyl-3-methylglycerol, and combinations thereof.
• organic acids for example alkyl- and alkenyl
• heterocyclic compounds for example: substituted imidazolines and oxazolines, and 2-heptadecenyl-l-(2-hydroxyethyl)imidazoline
• phosphorus- containing compounds for example: amine salts of phosphoric acid partial esters or phosphonic acid partial esters, molybdenum- containing compounds, such as molydbenum dithiocarbamate and other sulphur and phosphorus containing derivatives
• sulfur-containing compounds for example: barium dinonylnaphthalenesulfonates, calcium petroleum sulfonates, alky lthio- substituted aliphatic carboxylic acids, esters of aliphatic 2-sulfocarboxylic acids and salts thereof
• glycerol derivatives for example: glycerol monooleate, l-(alkylphenoxy)-3-(2- hydroxyethyl)glycerols, l-(alkylphenoxy)-3-(
• the rust inhibitor and/or friction modifier can be used in various amounts.
• the rust inhibitor and/or friction modifier may be present in the lubricant composition in an amount ranging from 0.01 to 0.1, 0.05 to 0.01, or 0.07 to 0.1, wt.%, based on the total weight of the lubricant composition.
• the rust inhibitor and/or friction modifier may be present in amounts of less than 1 , less than 0.7, or less than 0.5, wt.%, based on the total weight of the lubricant composition.
• the viscosity index improver can be of various types. Suitable examples of viscosity index improvers include polyacrylates, polymethacrylates, vinylpyrrolidone/methacrylate copolymers, polyvinylpyrrolidones, polybutenes, olefin copolymers, styrene/acrylate copolymers and poly ethers, and combinations thereof.
• the viscosity index improver can be used in various amounts.
• the viscosity index improver may be present in the lubricant composition in an amount ranging from 0.01 to 20, 1 to 15, or 1 to 10, wt.%, based on the total weight of the lubricant composition.
• the viscosity index improver may be present in amounts of less than 10, less than 8, or less than 5, wt.%, based on the total weight of the lubricant composition.
• the pour point depressant can be of various types. Suitable examples of pour point depressants include polymethacrylate and alkylated naphthalene derivatives, and combinations thereof. [0095] If employed, the pour point depressant can be used in various amounts. The pour point depressant may be present in the lubricant composition in an amount ranging from 0.01 to 0.1, 0.05 to 0.01, or 0.07 to 0.1, wt. , each based on the total weight of the lubricant composition. Alternatively, the pour point depressant may be present in amounts of less than 1.0, less than 0.7, or less than 0.5, wt.%, based on the total weight of the lubricant composition.
• the detergent can be of various types. Suitable examples of detergents include overbased or neutral metal sulphonates, phenates and salicylates, and combinations thereof.
• the detergent can be used in various amounts.
• the detergent may be present in the lubricant composition in an amount ranging from 0.01 to 5, 0.1 to 4, 0.5 to 3, or 1 to 3, wt.%, based on the total weight of the lubricant composition.
• the detergent may be present in amounts of less than 5, less than 4, less than 3, less than 2, or less than 1, wt.%, based on the total weight of the lubricant composition.
• the lubricant composition is substantially free of water, e.g., the lubricant composition includes less than 5, less than 4, less than 3, less than 2, less than 1, less than 0.5, or less than 0.1, wt.%, of water, based on the total weight of the lubricant composition.
• the lubricant composition may be completely free of water.
• Preferred lubricant compositions provided for use and used pursuant to this invention include those which pass the CEC L-39-T96 seal compatibility test.
• the CEC L-39-T96 test involves keeping a test specimen of a fluoropolymer in a lubricant composition at 150 °C. The seal specimens are then removed and dried and the properties of the seal specimens are assessed and compared to the seal specimens which were not heated in the lubricant composition. The percent change in these properties is assessed to quantify the compatibility of the fluoropolymer seal with the lubricant composition.
• the incorporation of the boroxine compound into the lubricant composition decreases the tendency of the lubricant composition to degrade the seals versus lubricant compositions which are free from the boroxine compound
• the pass/fail criteria include maximum variation of certain characteristics after immersion for 7 days in fresh oil without pre-aging.
• the maximum variation for each characteristic depends on the type of elastomer used, the type of engine used, and whether an aftertreatment device is utilized.
• a conventional lubricant composition passes the test if the exposed test specimen exhibits a change in hardness from -1% to +5%; a tensile strength (as compared to an untested specimen) from -50% to +10%; a change in elongation at rupture (as compared to an untested specimen) from -60% to +10%; and a volume variation (as compared to an untested specimen) from -1% to +5%.
• the change in hardness can range from -1 to 5 %, -0.5 to 5 %, -0.1 to 5 %, 0.5 to 5 %, or 1 to 5 %;
• the change in tensile strength can range from -50 to 10 %, -45 to 10 %, -40 to 10 %, or -35 to 10%;
• the change in elongation at rupture can range from -60 to 10 %, -55 to 10 %, -50 to 10 %, or -45 to 10%;
• the change in volume variation can range from -1 to 5 %, -0.75 to 5 %, -0.5 to 5 %, -0.1 to 5 %, or 0 to 5 %.
• the resulting lubricant composition has a fluoropolymer compatibility such that a fluoropolymer seal submerged in said lubricant composition exhibits a change in tensile strength of less than 10, less than 15, less than 20, less than 25, less than 30, less than 35, less than 40, less than 45, less than 50, less than 55, or less than 60, %, when tested according to CEC L-39-T96 for Heavy-Duty Diesel Engines.
• the resulting lubricant composition has a fluoropolymer compatibility such that a fluoropolymer exhibits a change in tensile strength elongation at rupture of less than 20, less than 25, less than 30, less than 35, less than 40, less than 45, less than 50, less than 55, or less than 60, , when tested according to CEC L-39-T96 for Heavy-Duty Diesel Engines.
• Some of the compounds described above may interact in the lubricant composition, so that the components of the lubricant composition in final form may be different from those components that are initially added or combined together.
• Some products formed thereby, including products formed upon employing the lubricant composition of this invention in its intended use, are not easily described or describable. Nevertheless, all such modifications, reaction products, and products formed upon employing the lubricant composition of this invention in its intended use, are expressly contemplated and hereby included herein.
• Various embodiments of this invention include one or more of the modification, reaction products, and products formed from employing the lubricant composition, as described above.
• a method of lubricating a system includes contacting the system with the lubricant composition described above.
• the system may further comprise an internal combustion engine.
• the system may further comprise any combustion engine or application that utilizes a lubricant composition.
• the system includes at least one fluoropolymer seal.
• the fluoropolymer seal may comprise a fluoroelastomer.
• the fluoroelastomer may be categorized under ASTM D1418 and ISO 1629 designation of FKM for example.
• the fluoroelastomer may comprise copolymers of hexafluoropropylene (HFP) and vinylidene fluoride (VDF of VF2), terpolymers of tetrafluoroethylene (TFE), vinylidene fluoride and hexafluoropropylene, perfluoromethylvinylether (PMVE), copolymers of TFE and propylene and copolymers of TFE, PMVE and ethylene.
• the fluorine content varies for example between 66 to 70 wt.
• a method of forming the lubricant composition includes combining the base oil and the boroxine compound, and, optionally, the sterically hindered amine compound.
• the boroxine compound may be incorporated into the base oil in any convenient way.
• the boroxine compound can be added directly to the base oil by dispersing or dissolving it in the base oil at the desired level of concentration.
• the base oil may be added directly to the boroxine compound in conjunction with agitation until the boroxine compound is provided at the desired level of concentration.
• Such blending may occur at ambient or lower temperatures, such as 30, 25, 20, 15, 10, or 5°C.
• exemplary lubricant compositions were formulated by blending each of the components together until homogeneity was achieved.
• a fully formulated lubricating oil composition containing dispersant, detergent, aminic antioxidant, phenolic antioxidant, anti-foam, base oil, antiwear additive, pour point depressant and viscosity modifier was prepared.
• This lubricant composition which is representative of a commercial crankcase lubricant, is designated as the "reference lubricant" and used as a baseline to compare the effects of different components on seal compatibility.
• the reference lubricant was combined with various different boron- containing compounds and various different nitrogen-containing compounds to demonstrate the effect of the boron-containing compounds and the effect of nitrogen- containing compounds on seal compatibility.
• Practical Examples #1, #2, #3, and #4 each include one of the practical boroxine compounds and one of the practical amine compounds.
• Comparative Examples #1-5 do not include any of the practical boroxine compounds.
• Comparative Examples #6-8 do not include any of the practical amine compounds.
• Comparative Examples #9-#12 do not include either the practical amine compounds or the practical boroxine compounds.
• the boron-containing compound added to the reference lubricant in Practical Examples #1 and #2 is trimethoxyboroxine.
• the boron-containing compound added to the reference lubricant in Practical Example #3 is triethoxyboroxine.
• the boron- containing compound added to the reference lubricant in Practical Example #4 is tri- n-butoxyboroxine .
• Comparative Examples #1-5 do not include the practical boroxine compounds. Instead, the compositions of both Comparative Example #1 and Comparative Example #2 are free of any boron-containing compound. Comparative Example #1 includes the practical amine compound, whereas Comparative Example #2 does not include the practical amine compound.
• the boron-containing compound added to the reference lubricant in Comparative Example #3 was tris-(2-ethylhexyl)boroxine.
• the boron-containing compound added to the reference lubricant in Comparative Example #4 is tributyl borate.
• the boron- containing compound added to the reference lubricant in Comparative Example #5 is tri-isopropyl borate.
• Comparative Examples #6-9 include the practical boroxine compounds but do not include the practical amine compounds.
• the boroxine compound added to the reference lubricant in Comparative Examples #6 and 7 is trimethoxyboroxine.
• the boroxine compound added to the reference lubricant in Comparative Example #8 is triethoxyboroxine.
• the boroxine compound added to the reference lubricant in Comparative Example #9 is tri-n-butoxyboroxine.
• Comparative Examples #10-12 do not include either the practical boroxine compound or the practical amine compound.
• Comparative Example #10 is tris-(2-ethylhexyl)boroxine.
• the boron-containing compound in Comparative Example #11 is tributyl borate.
• the boron-containing compound in Comparative Example #12 is tri-isopropyl borate.
• Examples #1 and 3-5 is (2,2,6,6-tetramethyl-4-piperidyl) dodecanoate.
• the seal compatibility of the practical and comparative examples was evaluated using an industry- standard CEC L-39-T96 seal compatibility test.
• the CEC-L-39-T96 seal compatibility test is performed by submitting the seal or gaskets in the lubricant composition, heating the lubricant composition with the seal contained therein to an elevated temperature, and maintaining the elevated temperature for a period of time. The seals are then removed and dried, and the mechanical properties of the seal are assessed and compared to the seal specimens which were not heated in the lubricant composition. The percent change in these properties is analyzed to assess the compatibility of the seal with the lubricant composition. Each formulation was tested twice (Run #1 and Run #2) under the same conditions. The results of the seal compatibility test are shown below in Tables 5-10.
• Comparative Example #1 is illustrative of the effect of an amine compound on the seal compatibility of a lubricant composition.
• Comparative Example #2 which does not include the practical amine compound
• the inventors realized that the addition of a practical amine compound to the reference lubricant negatively impacts the seal compatibility of the reference lubricant.
• the negative impact is quantified by the fact that the tensile strength and elongation at rupture is much worse for Comparative Example #1 when compared to Comparative Example #2.
• Tables 5-8 demonstrate that the seal compatibility of Practical Examples #1 and 2 was improved in terms of tensile strength and elongation at rupture as compared to the seal compatibility of Comparative Examples #3-5.
• the tensile strength of Practical Example #1 was -39 and -32%; and the tensile strength of Practical Example #2 was -2 and -5%; whereas the tensile strength of Comparative Examples #3, 4, and 5, was -47 and -44%; -39 and -41; and -44 and -42%, respectively.
• Comparative Example #2 Comparative Examples #6-12 demonstrates that lubricant compositions which include boron- containing compounds but do not include the practical amine compound do not negatively affect the seal compatibility of the lubricant composition in a significant way. Accordingly, the inventors of the subject application have surprisingly realized that the combination of the practical amine compound and the practical boroxine compounds have a synergistic impact on seal compatibility when present in the reference lubricant.
• any ranges and subranges relied upon in describing various embodiments of the present invention independently and collectively fall within the scope of the appended claims and are understood to describe and contemplate all ranges, including whole and/or fractional values therein, even if such values are not expressly written herein.
• One of skill in the art readily recognizes that the enumerated ranges and subranges sufficiently describe and enable various embodiments of the present invention and such ranges and subranges may be further delineated into relevant halves, thirds, quarters, fifths, and so on. As just one example, a range "ranging from 0.1 to 0.9" may be further delineated into a lower third, i.e.
• a range of “at least 10” inherently includes a subrange ranging from at least 10 to 35, a subrange ranging from at least 10 to 25, a subrange from 25 to 35, and so on, and each subrange may be relied upon individually and/or collectively and provides adequate support for specific embodiments within the scope of the appended claims.
• an individual number within a disclosed range may be relied upon and provides adequate support for specific embodiments within the scope of the appended claims.
• a range "ranging from 1 to 9" includes various individual integers, such as 3, as well as individual numbers including a decimal point (or fraction), such as 4.1, which may be relied upon and provide adequate support for specific embodiments within the scope of the appended claims.
• Claim 3 can depend from any one of claims 1 through 2;
• Claim 4 can depend from any one of claims 1 through 3 ;
• Claim 5 can depend from any one of claims 1 through 4;
• Claim 6 can depend from any one of claims 1 through 5;
• Claim 7 can depend from any one of claims 1 through 6;
• Claim 9 can depend from any one of claims 1 through 8;
• Claim 10 can depend from any one of claims 1 through 9;
• Claim 11 can depend from any one of claims 1 through 10;
• Claim 12 can depend from any one of claims 1 through 11.

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