US20100099588A1 - Dispersant Combination for Improved Transmission Fluids - Google Patents

Dispersant Combination for Improved Transmission Fluids Download PDF

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Publication number
US20100099588A1
US20100099588A1 US12/523,339 US52333908A US2010099588A1 US 20100099588 A1 US20100099588 A1 US 20100099588A1 US 52333908 A US52333908 A US 52333908A US 2010099588 A1 US2010099588 A1 US 2010099588A1
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composition
dispersant
meth
nitrogen
percent
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Calvin A. James
Craig D. Tipton
William D. Abraham
Edward J. Konzman
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Lubrizol Corp
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Lubrizol Corp
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Priority to US12/523,339 priority Critical patent/US20100099588A1/en
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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
    • 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
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
    • C10M2215/24—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions having hydrocarbon substituents containing thirty or more carbon atoms, e.g. nitrogen derivatives of substituted succinic acid
    • C10M2215/28—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
    • C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2217/02—Macromolecular compounds obtained from nitrogen containing monomers by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2217/02—Macromolecular compounds obtained from nitrogen containing monomers by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2217/028—Macromolecular compounds obtained from nitrogen containing monomers by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a nitrogen-containing hetero ring
    • 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
    • C10M2223/043—Ammonium or amine salts thereof
    • 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
    • C10M2223/049—Phosphite
    • 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
    • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
    • 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
    • C10N2030/76—Reduction of noise, shudder, or vibrations
    • 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
    • C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
    • 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
    • C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
    • C10N2040/042—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives for automatic transmissions
    • 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
    • C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
    • C10N2040/045—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives for continuous variable transmission [CVT]
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2060/00—Chemical after-treatment of the constituents of the lubricating composition
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2060/00—Chemical after-treatment of the constituents of the lubricating composition
    • C10N2060/14—Chemical after-treatment of the constituents of the lubricating composition by boron or a compound containing boron

Definitions

  • the present invention relates to the field of additives for fluids such as automatic transmission fluids, traction fluids, fluids for continuously variable transmissions (CVTs), dual clutch automatic transmission fluids, farm tractor fluids, and engine lubricants.
  • fluids such as automatic transmission fluids, traction fluids, fluids for continuously variable transmissions (CVTs), dual clutch automatic transmission fluids, farm tractor fluids, and engine lubricants.
  • the fluids may also be used for lubricating devices such as gear boxes, transfer cases, and chains.
  • ATF oil of lubricating viscosity for automatic transmission fluids
  • DVMs dispersant-viscosity modifiers
  • Other additives include succinimide dispersants as disclosed, for instance, in U.S. Application 2005/0202981, Eveland et al., published Sep. 15, 2005.
  • Additives and formulations for lubricating automatic transmissions have been described in a great number of patents and patent applications, including, recently, U.S. Application 2006/0172899, Tipton et al., Aug. 3, 2006.
  • the present invention therefore, solves the problem of achieving such a balance by employing in such a formulation a high nitrogen-content dispersant viscosity modifier in combination with a succinimide dispersant prepared by a “direct alkylation” process, described below.
  • Such formulations may also impart good friction and high temperature oxidation performance at a relatively low treat rate
  • a lubricant composition comprising:
  • a dispersant viscosity modifier comprising a poly(meth)acrylate copolymer containing a nitrogen-containing monomer in an amount to provide at least about 0.4 percent by weight nitrogen to said dispersant viscosity modifier;
  • a succinimide dispersant prepared from reaction of an amine with a hydrocarbyl-substituted succinic acylating agent prepared by reaction of a polyalkene, at least about 70 percent of the chains thereof containing a terminal vinylidene end group, with maleic anhydride in the substantial absence of chlorine.
  • One component of the present invention is an oil of lubricating viscosity, which can be present in a major amount, for a lubricant composition, or in a concentrate forming amount, for a concentrate.
  • Suitable oils include natural and synthetic lubricating oils and mixtures thereof.
  • the oil of lubricating viscosity is generally present in a major amount (i.e. an amount greater than 50 percent by weight).
  • the oil of lubricating viscosity is present in an amount of 75 to 95 percent by weight, and often greater than 80 percent by weight of the composition.
  • the amount of oil will be reduced, e.g., 20 to 80 percent or 30 to 60 percent.
  • Natural oils useful in making the inventive lubricants and functional fluids include animal oils and vegetable oils as well as mineral lubricating oils such as liquid petroleum oils and solvent-treated or acid-treated mineral lubricating oils of the paraffinic, naphthenic or mixed paraffinic/-naphthenic types which may be further refined by hydrocracking and hydrofinishing processes.
  • Synthetic lubricating oils include hydrocarbon oils and halo-substituted hydrocarbon oils such as polymerized and interpolymerized olefins, also known as polyalphaolefins; polyphenyls; alkylated diphenyl ethers; alkyl- or dialkylbenzenes; and alkylated diphenyl sulfides; and the derivatives, analogs and homologues thereof. Also included are alkylene oxide polymers and inter-polymers and derivatives thereof, in which the terminal hydroxyl groups may have been modified by esterification or etherification.
  • esters of dicarboxylic acids with a variety of alcohols or esters made from C5 to C12 monocarboxylic acids and polyols or polyol ethers.
  • Other synthetic oils include silicon-based oils, liquid esters of phosphorus-containing acids, and polymeric tetrahydrofurans,
  • Unrefined, refined and rerefined oils can be used in the lubricants of the present invention.
  • Unrefined oils are those obtained directly from a natural or synthetic source without further purification treatment.
  • Refined oils have been further treated in one or more purification steps to improve one or more properties. They can, for example, be hydrogenated, resulting in oils of improved stability against oxidation.
  • the oil of lubricating viscosity is an API Group II, Group III, Group IV, or Group V oil, including a synthetic oil, or mixtures thereof. These are classifications established by the API Base Oil Interchangeability Guidelines. Both Group II and Group III oils contain ⁇ 0.03 percent sulfur and >99 percent saturates. Group ii oils have a viscosity index of 80 to 120, and Group III oils have a viscosity index >120, Polyalphaolefins are categorized as Group IV.
  • the oil can also be an oil derived from hydroisomerization of wax such as slack wax or a Fischer-Tropsch synthesized wax.
  • Group V is encompasses “all others” (except for Group 1, which contains >0.03% S and/or ⁇ 90% saturates and has a viscosity index of 80 to 120).
  • the present invention may be used in Group II oils, which may especially reveal its benefits.
  • the oils of the present invention can encompass oils of a single viscosity range or a mixture of high viscosity and low viscosity range oils.
  • the oil exhibits a 100° C. kinematic viscosity of 1 or 2 to 8 or 10 mm 2 /sec (cSt).
  • the overall lubricant composition may be formulated using oil and other components such that the viscosity at 100° C. is 1 or 1.5 to 10 or 15 or 20 mm 2 /sec and the Brookfield viscosity (ASTM-D-2983) at ⁇ 40° C. is less than 20 or 15 Pa-s (20,000 cP or 15,000 cP), or less than 10 Pa-s, even 5 or less.
  • a dispersant viscosity modifier in particular, a dispersant viscosity modifier comprising a polyacrylate or polymethacrylate (hereinafter referred to as “poly(meth)acrylate”) copolymer containing a nitrogen-containing monomer
  • Such materials typically include monomer-derived units from a monomer composition comprising one or more (meth)acrylates (that is, acrylates or methacrylates) of the formula (I), in which R denotes hydrogen or methyl and R 1 denotes hydrogen or a linear or branched alkyl radical having 1 to 40 carbon atoms.
  • Suitable monomers according to formula (I) include (meth)acrylates which are derived from saturated alcohols, such as methyl(meth)acrylate, ethyl(meth)acrylate, n-propyl(meth)acrylate, isopropyl(meth)acrylate, n-butyl(meth)acrylate, tert-butyl(meth)acrylate, pentyl(meth)acrylate, hexyl(meth)acrylate, b 2 -ethylhexyl(meth)acrylate, heptyl(meth)acrylate, 2-tert-butylheptyl(meth)acrylate, octyl(meth)acrylate, 3-isopropylheptyl(meth)acrylate, nonyl(meth)acrylate, decyl(meth)acrylate, undecyl(meth)acrylate, 5-methylundecyl(meth)acrylate, dodecy
  • the monomer composition may comprise one or more (meth)acrylates of the formula (I) in which R denotes hydrogen or methyl and R 1 denotes an alkyl radical substituted by an OH group and having 2 to 20 carbon atoms or denotes an alkoxylated radical of the formula (II) in which R 3 and R 4 independently represent hydrogen or methyl, R 5 represents hydrogen or an alkyl radical having 1 to 40 carbon atoms and n represents an integer from 1 to 90.
  • Such (meth)acrylates are known to a person skilled in the art and include hydroxyalkyl(meth)acrylates, such as 3-hydroxypropyl methacrylate, 3,4-dihydroxybutyl methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 2,5-dimethyl-1,6-hexanediol(meth)acrylate, 1,10-decanediol(meth)acrylate, 1,2-propanediol(meth)acrylate; polyoxyethylene and polyoxypropylene derivatives of (meth)acrylic acid, such as triethylene glycol(meth)acrylate, tetraethylene glycol(meth)acrylate and tetrapropylene glycol(meth)acrylate. (The products from the polyols are believed to comprises largely the mono(meth)acrylates).
  • the poly(meth)acrylate backbone may comprise acrylic or methacrylic ester monomers having an alcohol-derived moiety of the ester having 1 to 40 or 1 to 30 carbon atoms, or 2 to 24 carbon atoms, or mixtures thereof.
  • Certain esters include methyl esters, ethyl, butyl, C9-11, and C12-18 esters.
  • a suitable (meth)acrylate is methyl methacrylate.
  • mixtures of alcohols of 2 to 11 (or 9 to 11) or 1 to 4 carbon atoms, alone or further in combination with alcohols of 12 to 24 (or 12 to 18) carbon atoms may be used, as described in U.S. Pat. No. 6,881,780 or 6,124,249.
  • Suitable nitrogen-containing monomers for use in the DVM include nitrogen-containing (meth)acrylate (that is, acrylate or methacrylate) monomers such as amides or nitrogen-containing esters.
  • Suitable amides include the condensation products of (meth)acrylic acid with ammonia, monoamines, diamines, or polyamines.
  • the amine used to form the amide will normally contain at least one, and in certain embodiments exactly one, N—H group capable of condensing with carboxylic acid functionality, to form nitrogen-containing carboxylic derivatives with dispersant functionality.
  • Suitable amines include aromatic amines wherein a carbon atom of the aromatic ring structure is attached directly to the amino nitrogen.
  • the amines may be monoamines or polyamines.
  • the aromatic ring will typically be a mononuclear aromatic ring (i.e., one derived from benzene) but can include fused aromatic rings, especially those derived from naphthalene,
  • aromatic amines include aniline, N-alkylanilines such as N-methyl aniline, and N-butylaniline, di-(para-methylphenyl)amine, naphthylamine, 4-amino-diphenylamine, N,N-dimethylphenylenediamine, 4-(4-nitrophenylazo)aniline (disperse orange 3), sulfamethazine, 4-phenoxyaniline, 3-nitroaniline, 4-aminoacetanilide 4-amino-2-hydroxy-benzoic acid phenyl ester (phenyl amino salicylate),
  • aromatic amines also include amino-substituted aromatic compounds and amines in which the amine nitrogen is a part of an aromatic ring, such as 3-aminoquinoline, 5-aminoquinoline, and 8-aminoquinoline. Also included are aromatic amines such as 2-aminobenzimidazole, which contains one secondary amino group attached directly to the aromatic ring and a primary amino group attached to the imidazole ring.
  • amines include N-(4-anilinophenyl)-3-aminobutanamide (i.e., ⁇ -NH- ⁇ -NH—COCH 2 CH(CH 3 )NH 2 ).
  • Additional aromatic amines include aminocarbazoles, aminoindoles, aminopyrroles, amino-indazolinones, aminoperimidines, mercaptotriazoles, aminophenothiazines, aminopyridiens, aminopyrazines, aminopyrimidines, pyridines, pyrazines, pyrimidines, aminothiadiazoles, aminothiothiadiazoles, and aminobenzotriaozles.
  • aromatic amines include 3-amino-N-(4-anilinophenyl)-N-isopropyl butanamide, and N-(4-anilinophenyl)-3- ⁇ (3-aminopropyl)-(cocoalkyl)amino ⁇ butanamide.
  • Other aromatic amines include various aromatic amine dye intermediates containing multiple aromatic rings linked by, for example, amide structures. Examples include materials of the general structure ⁇ -CONH- ⁇ -NH 2 where the phenyl groups may be further substituted.
  • Aromatic amines include those in which the amine nitrogen is a substituent on an aromatic carboxylic compound, that is, the nitrogen is not sp 2 hybridized within an aromatic ring. Certain aromatic amines, such as alkylated diphenylamines, may be used as antioxidants. To the extent that these materials will condense with a carboxylic functionality, they may also be suitable
  • Aromatic amines can be used alone or in combination with each other or in combination with or aliphatic or cycloaliphatic amines.
  • the amount of such an aliphatic or cycloaliphatic amine may, in some embodiments, be a minor amount compared with the amount of the aromatic amine.
  • Aliphatic or cycloaliphatic amines include monoamines having, e.g., 1 to 8 carbon atoms, such as methylamine, ethylamine, and propylamine, as well as various higher amines. Aliphatic diamines or polyamines can also be used, and in certain embodiments they will have only a single primary or secondary amino group.
  • Examples include dimethylaminopropylamine, diethylaminopropylamine, dibutylaminopropylamine, dimethylaminoethylamine, diethylaminoethylamine, dibutylaminoethylamine, 1-(2-aminoethyl)piperidine, 1-(2-aminoethyl)pyrrolidone, aminoethylmorpholine, and aminopropylmorpholine.
  • the amine component may comprise an amine having at least two N—H groups capable of condensing with carboxylic acid functionality, to serve to link together two polymers containing carboxylic acid functionality.
  • linking amines include ethylene diamine, 2,4-diaminotoluene, phenylene diamine, propylene diamine, hexamethylene diamine, and ⁇ , ⁇ -polyalkylenediamines.
  • the nitrogen-containing monomer units may also include one or more (meth)acrylates or (meth) acrylamides of the formula (III), in which R denotes hydrogen or methyl, X denotes oxygen or an amino group of the formula —NH—or —NR 7 —, in which R 7 represents an alkyl radical having 1 to 40 carbon atoms, and R 6 denotes a linear or branched alkyl radical substituted by at least one —NR 8 R 9 group and having 2 to 20, or 2 to 6, carbon atoms, R 8 and R 9 independently representing hydrogen or an alkyl radical having 1 to 20 or 1 to 6 carbon atoms, or in which R 8 and R 9 , including the nitrogen atom and optionally a further nitrogen or oxygen atom, form a 5- or 6-membered ring which optionally may be substituted by a C1-C6-alkyl group.
  • R denotes hydrogen or methyl
  • X denotes oxygen or an amino group of the formula —NH—or —NR 7
  • the (meth)acrylates or the (meth)acrylamides according to formula (III) include amides of (meth)acrylic acid, such as N-(3-dimethylaminopropyl)methacrylamide, N-(diethylphosphono)methacrylamide, 1-methacryloylamido-2-methyl-2-propanot, N-(3-dibutylaminopropyl)methacrylamide, N-tert-butyl-N-(diethylphosphono)methacrylamide, N,N-bis(2-diethylaminoethyl)methacrylamide, 4-methacryloylamido-4-methyl-2-pentanol, N-(methoxymethyl)methacrylamide, N-(2-hydroxyethyl)methacrylamide, N-acetylmethacrylamide, N-(dimethylaminoethyl)methacrylamide, N-methyl-N-phenyl-methacrylamide, N
  • ethylenically unsaturated and copolymerizable monomers may be used along with or in place of the (meth)acrylic monomer.
  • maleic acid or maleic anhydride can be reacted with a reactive amine to provide an amide (half amide or bis-amide) or an imide and may similarly be reacted with various aminoalcohols to provide any of a variety of ester or amide or imide compounds.
  • maleic anhydride itself may be copolymerized or grafted onto a polymer chain to give a succinic anhydride moiety which may be further reacted with an amine or aminoalcohol.
  • Other monomers that may be reacted with amines or aminoalcohols to provide a nitrogen-containing monomer include vinyl substituted nitrogen heterocyclic monomers such as N-vinyl imidazole, N-vinyl pyrrolidinone, and N-vinyl caprolactam; dialkylaminoalkyl(meth)acrylate monomers, in which the alkyl or amino alkyl groups may independently contain 1 to 8 carbon atoms; dialkylaminoalkyl(meth)acrylamide monomers, and teriary alkyl(meth)acrylamides such as t-butyl acrylamide.
  • vinyl substituted nitrogen heterocyclic monomers such as N-vinyl imidazole, N-vinyl pyrrolidinone, and N-vinyl caprolactam
  • dialkylaminoalkyl(meth)acrylate monomers in which the alkyl or amino alkyl groups may independently contain 1 to 8 carbon atoms
  • monomers include piperazine N-alkylmethacrylamide, morpholine N-alkylacrylamide, N-2-aminoethyl-N′-hydroxyethyl methacrylamide, and N-2-aminoethyl-N′-pyridinyl methacylamide.
  • the monomer composition may comprise other monomers such as styrene compounds.
  • styrene substituted styrenes having an alkyl substituent in the side chain, such as alpha-methylstyrene and alpha-ethylstyrene, substituted styrenes having an alkyl substituent on the ring, such as vinyltoluene and p-methylstyrene, halogenated styrenes, such as monochlorostyrenes, dichlorostyrenes, tribrotnostyrenes and tetrabromostyrenes.
  • the amount of the nitrogen-containing monomer may be an amount suitable to provide at least 0.4 percent by weight of nitrogen to the dispersant viscosity modifier or alternatively 0.4 to 2 percent or to 1.5 percent or to 1.2 percent or to 1.0 percent, or alternatively 0.5 to 0.8 percent.
  • the amount of nitrogen-containing monomer required to deliver this amount of nitrogen to the polymer will depend, of course, on the particular monomer and its nitrogen content.
  • the monomer dimethylaminopropyl methacrylamide, having two nitrogens is itself about 16.5 percent by weight nitrogen. Suitable amounts of such monomers generally within the copolymer may thus be 1 to 10 percent by weight, or 2.5 to 6 percent or 3 to 5 percent or about 4 percent.
  • the dispersant viscosity modifier may be prepared by several different processes.
  • the nitrogen-containing copolymer is obtained by reacting, together, (meth)acrylate ester monomers and the nitrogen-containing monomer.
  • the nitrogen-containing monomer is grafted onto a preformed (meth)acrylate copolymer backbone, or maleic anhydride may be grafted and subsequently reacted with amine.
  • the polymer can be prepared by reacting a suitable amine with a (meth)acrylate copolymer, liberating the alcohol functionality from a portion of the ester groups.
  • the dispersant viscosity modifier may be prepared in an organic diluent, and specific amounts and types of diluent can affect the low temperature viscosity properties of lubricants containing them.
  • the molecular weight (number average molecular weight, M n ) of the dispersant viscosity modifier may be 10,000 to 300,000, or 20,000 to 150,000, or 30,000 to 100,000.
  • the amount of the dispersant viscosity modifier employed in final lubricating compositions may be 0.5 to about 10 weight percent, or 0.6 to 5% or 0.75 to 4.0% or 1 to 3.5% or 1.5 to 3.35%. In a concentrate, the amount of the dispersant viscosity modifier will be correspondingly greater, e.g., 2 to 50 or 5 to 45 or 10 to 35 percent by weight.
  • Another component of the present invention is a succinimide dispersant prepared by a certain method, sometimes referred to as “direct alkylation.”
  • Succinimide dispersants generally are characterized by a polar group attached to a relatively high molecular weight hydrocarbon chain.
  • Typical alkenyl succinimides have a variety of chemical structures including typically
  • each R 1 is independently an alkyl group, frequently a polyisobutyl group with a molecular weight of 500-5000, and R 2 are alkylene groups, commonly ethylene (C 2 H 4 ) groups.
  • R 2 are alkylene groups, commonly ethylene (C 2 H 4 ) groups.
  • Such molecules are commonly derived from reaction of an alkenyl acylating agent with a polyamine, and a wide variety of linkages between the two moieties is possible beside the simple imide structure shown above, including a variety of amides and quaternary ammonium salts.
  • a variety of modes of linkage of the R 1 groups onto the imide structure are possible, including various cyclic linkages. Succinimide dispersants are more fully described in U.S. Pat. Nos. 4,234,435 and 3,172,892.
  • the succinimide dispersants of the present invention are prepared from hydrocarbyl-substituted succinic acylating agents which are in turn prepared by the so-called “direct alkylation” or “thermal” route, as contrasted with the so-called “chlorine” route. These routes differ in the method by which a polyalkylene (typically polyisobutylene, but also copolymers including ethylene copolymer) substituent is prepared and by which it is affixed to a maleic, that is, succinic acid or anhydride moiety.
  • a polyalkylene typically polyisobutylene, but also copolymers including ethylene copolymer
  • isobutylene is polymerized in the presence of AlCl3 to produce a mixture of polymers comprising predominantly trisubstituted olefin (III) and tetrasubstituted olefin (IV) end groups, with only a very small amount (for instance, less than 20 percent) of chains containing a terminal vinylidene group (I).
  • isobutylene is polymerized in the presence of BF3 catalyst to produce a mixture of polymers comprising predominantly (for instance, at least 70 percent) terminal vinylidene groups, with smaller amounts of tetrasubstituted end groups and other structures.
  • BF3 catalyst BF3 catalyst
  • a thermal process for preparing polyisobutene-substituted maleic anhydride is described in European patent publication EP 0 355 895 A2.
  • the intermediate polyisobutene materials from a non-chlorine process sometimes referred to as “high vinylidene PIB,” are also described in U.S. Pat. No. 6,165,235, Table 1 of which is summarized below:
  • R is —H or —CH 3 and PIB represents a polyisobutene residue after reaction.
  • a certain amount of mono-reacted cyclic material can also be present, as shown:
  • the hydrocarbyl-substituted succinic anhydride of (a) contains on average 1.1 or 1.3 to 1.8 succinic anhydride moieties per hydrocarbyl group. It is also believed that a minor amount (e.g., up to 7 or 15 or 18 percent, e.g., 7 to 15 percent) of the product may contain a succinic anhydride moiety attached to the hydrocarbyl group by one sort or another of non-cyclic linkage.
  • the hydrocarbyl substituents on the succinic anhydride component should normally be of sufficient length to provide a desired degree of solubility in a lubricating oil.
  • Such substituent will typically have a molecular weight of at least 300, at least 800, or at least 1200, Typical upper limits to the molecular weight may be determined by considerations of solubility, cost, or other practical considerations, and may be up to 5000 or up to 2500.
  • the hydrocarbyl substituents can have a molecular weight of 300 to 5000 or 800 to 2500.
  • the hydrocarbyl-substituted succinic anhydride (or reactive equivalent thereof) is condensed an amine (or a mixture of amines) to form the succinimide dispersant.
  • Amines which can be used in preparing such dispersants include polyamines, such as aliphatic, cycloaliphatic, heterocyclic or aromatic polyamines. Examples of the polyamines include alkylene polyamines, hydroxy containing polyamines, arylpolyamines, and heterocyclic polyamines.
  • Alkylene polyamines are represented by the formula
  • n typically has an average value 1, or 2 to 10, or to 7, or to 5, and the “Alkylene” group has 1, or 2 to 10, or to 6, or to 4 carbon atoms.
  • Each R 5 is independently hydrogen, or an aliphatic or hydroxy-substituted aliphatic group of up to 30 carbon atoms.
  • alkylenepolyamines include polymethylenepolyamines, ethylenepolyamines, butylenepolyamines, propylenepolyamines, and pentylenepolyamines. The higher homologs and related heterocyclic amines such as piperazines and N-aminoalkyl-substituted piperazines are also included.
  • polyamines examples include ethylenediamine, diethylenetriamine (DETA), triethylenetetramine (TETA), tris-(2-aminoethyl)amine, propylenediamine, trimethylenediamine, tripropylenetetramine, tetraethylenepentamine (TEPA), hexaethyleneheptamine, and pentaethylenehexamine.
  • DETA diethylenetriamine
  • TETA triethylenetetramine
  • TEPA tetraethylenepentamine
  • hexaethyleneheptamine hexaethyleneheptamine
  • pentaethylenehexamine hexaethylenehexamine.
  • Higher homologs obtained by condensing two or more of the above-noted alkylene amines are similarly useful as are mixtures of two or more of the aforedescribed polyamines.
  • Such polyamines are described in detail under the heading Ethylene Amines in Kirk Othmer's “Encyclopedia of Chemical Technology”, 2d Edition, Vol.
  • polyamine mixtures are those resulting from stripping of the above-described polyamine mixtures to leave as residue what is often termed polyamine bottoms or, more specifically, polyethyleneamine bottoms.
  • Another useful polyamine is a condensation reaction between a hydroxy compound and a polyamine reactant containing at least one primary or secondary amino group, as. described in U.S. Pat. No. 5,053,152 and PCT publication WO86/05501.
  • the dispersants described herein may be post-treated by reaction with any of a variety of agents. Among these are urea, thiourea, dimercaptothiadiazoles, carbon disulfide, aldehydes, ketones, carboxylic acids such as terephthalic acid, hydrocarbon-substituted succinic anhydrides, nitrites, epoxides, boron compounds, and phosphorus compounds. References detailing such treatment are listed in U.S. Pat. No. 4,654,403.
  • borated dispersants may be prepared by reacting the dispersant with a boron compound such as boric acid or an alkali or mixed alkali metal and alkaline earth metal borate.
  • metal borates are generally a hydrated particulate metal borate which are known in the art.
  • Alkali metal borates include mixed alkali and alkaline metal borates. These metal borates are available commercially.
  • the boron content of the succinimide dispersant, if borated, may be 0.1 to about 1 weight percent or 0.2 to 0.6 or to 0.5 weight percent.
  • the nitrogen content of the dispersant may be 1 to 10 percent by weight, or 1 to 5%, or 1.5 to 3%, or 3 to 8%, or 5 to 6% (on an active chemical or diluent-free basis).
  • the dispersant may have a total base number (TBN) of 5 to 180 or 10 to 170 or 15 to 150 or 40 to 130 or 60 to 120, again, on an active chemical basis (factoring out the presence of any diluent).
  • the amount of the dispersant in compositions of the present invention may be 0.1 to 10 weight percent, or 0.5 to 7% or 1 to 5% or 2 to 3%. These amounts are particularly suitable for fully formulated lubricants. In concentrates, the amounts may be correspondingly greater, e.g., 5 to 70 or 10 to 50 or 15 to 35 or 20 to 30 percent by weight.
  • Suitable materials include antioxidants (such as dialkyl diarylamines, sulfur compounds such as hydroxyalkyl alkyl sulfides (e.g., 1-(tert-dodecylthio)-2-propanol), and hindered phenols including hindered phenolic esters such as those represented by the formula:
  • R 11 is a straight chain or branched chain alkyl group containing 2 to 22 carbon atoms, e.g., 2 to 8, 2 to 6, or 4 to 8 carbon such as 4 or 8 carbon atoms.
  • R 11 may be desirably a 2-ethylhexyl group or an n-butyl group.
  • compositions of the present invention may also include at least one phosphorus acid, phosphorus acid salt, phosphorus acid ester or derivative thereof, including sulfur-containing analogs thereof. Suitable amounts include 0.002-1.0 weight percent.
  • the phosphorus acids, salts, esters or derivative include phosphoric acid, phosphorous acid, phosphorus acid esters and salts thereof, phosphites, phosphorus-containing amides, phosphorus-containing carboxylic acids or esters, phosphorus-containing ethers, and mixtures thereof.
  • the phosphorus acid, ester or derivative can be an organic or inorganic phosphorus acid, phosphorus acid ester, phosphorus acid salt, or derivative thereof.
  • the phosphorus acids include the phosphoric, phosphonic, phosphinic, and thiophosphoric acids including dithiophosphoric acid as well as the monothiophosphoric, thiophosphinic and thiophosphonic acids.
  • One group of phosphorus compounds are alkylphosphoric acid mono alkyl primary amine salts as represented by the formula
  • R 1 , R 2 , R 3 are alkyl or hydrocarbyl groups or one of R 1 and R 2 can be H.
  • the materials can be a 1:1 mixture of dialkyl and monoalkyl phosphoric acid esters. Compounds of this type are described in U.S. Pat. No. 5,354,484, Other suitable materials include phosphates and phosphites, e.g., dialkyl hydrogen phosphites such as dibutyl hydrogen phosphite or mixed di(C16 alkyl/C18 alkenyl)hydrogen phosphonates, i.e., dialkyl hydrogen phosphonates such as dilauryl hydrogen phosphonate. Such materials may be present in amounts of 0.01 to 2 percent by weight, or 0.02 to 1.0% or 0.05 to 0.5%.
  • Eighty-five percent phosphoric acid is a suitable material for addition to the fully-formulated compositions.
  • the phosphoric acid may be added as such, if desired, or may be pre-reacted with some other component of the composition. It may be included at a level of 0.01-0.3 weight percent based on the weight of the composition, or alternatively 0.02 to 0.25% or 0.03 to 0.2%, or to 0.1 percent.
  • the total amount of phosphorus in the lubricant composition, from all sources, is, in certain embodiments, 0.005 to 0, 5 or 0.01 to 0.2 weight percent.
  • the lubricant may contain multiple species of phosphorus compounds, for instance, an inorganic phosphorus acid such as phosphoric acid and a phosphorus ester such as dibutyl hydrogen phosphite or dilauryl hydrogen phosphite.
  • an inorganic phosphorus acid such as phosphoric acid
  • a phosphorus ester such as dibutyl hydrogen phosphite or dilauryl hydrogen phosphite.
  • the formulations may also contain any of a variety of friction modifiers. These may include secondary and tertiary amines as described in U.S. application 2006/0172899, see in particular paragraph 0010 and the examples in Table II thereof. These amines are represented by the formula R 1 R 2 NR 3 , where R 1 and R 2 are each independently an alkyl group of at least 6 carbon atoms and R 3 is a hydroxyl-containing alkyl group, a hydroxyl-containing alkoxyalkyl group, an amine-containing alkyl group, a hydrocarbyl group, or hydrogen, provided that when R 3 is H, then at least one of R 1 and R 2 is an alkyl group of 8 to 16 carbon atoms.
  • friction modifiers containing at least two hydrocarbon groups derived from the reaction of a carboxylic acid with an amino alcohol, as disclosed in WO 04/007652, and also friction modifiers derived from the reaction of a carboxylic acid or reactive equivalent thereof with an aminoalcohol, wherein the friction modifier contains at least two hydrocarbyl groups of at least 6 carbon atoms, as disclosed in U.S. application US-2005-0250655.
  • friction modifiers which are known and commercially available include fatty phosphites, fatty acid amides, fatty epoxides, borated fatty epoxides, other fatty amines, glycerol esters including glycerol partial esters, borated glycerol esters and partial esters, alkoxylated fatty amines, borated alkoxylated fatty amines, metal salts of fatty acids, sulfurized olefins, fatty imidazolines, condensation products of carboxylic acids and polyalkylene-polyamines, metal salts of alkyl salicylates, amine salts of alkylphosphoric acids, and mixtures thereof. Specific examples of many of these materials are set forth in the above-mentioned US application 2006/0172899, see paragraphs 0058 through 0068.
  • the lubricant composition may contain a detergent.
  • Detergents are typically neutral or basic (overbased) salts of acidic materials. Overbased materials are generally single phase, homogeneous Newtonian systems characterized by a metal content in excess of that which would be present for neutralization according to the stoichiometry of the metal and the particular acidic organic compound reacted with the metal.
  • the overbased materials are prepared by reacting an acidic material (typically an inorganic acid or lower carboxylic acid, preferably carbon dioxide) with a mixture comprising an acidic organic compound, a reaction medium comprising at least one inert, organic solvent (e.g., mineral oil, naphtha, toluene, xylene) for said acidic organic material, a stoichiometric excess of a metal base, and a promoter such as a phenol or alcohol.
  • the acidic organic material will normally have a sufficient number of carbon atoms to provide a degree of solubility in oil. The amount of excess metal is commonly expressed in terms of metal ratio.
  • metal ratio is the ratio of the total equivalents of the metal to the equivalents of the acidic organic compound.
  • a neutral metal salt has a metal ratio of one.
  • a salt having 4.5 times as much metal as present in a neutral salt will have metal excess of 3.5 equivalents, or a ratio of 4.5.
  • Patents describing techniques for making basic salts of sulfonic acids, carboxylic acids, phenols, phosphoric acids, and mixtures of any two or more of these include U.S. Pat. Nos. 2,501,731; 2,616,905; 2,616,911; 2,616,925; 2,777,874; 3,256,186; 3,384,585; 3,365,396; 3,320,162; 3,318,809; 3,488,284; and 3,629,109.
  • salixarate detergents include overbased materials prepared from salicylic acid (which may be unsubstituted) with a hydrocarbyl-substituted phenol, such entities being linked through CH 2 or other alkylene bridges. It is believed that the salixarate derivatives have a predominantly linear although both linear and macrocyclic structures are encompassed by the term “salixarate,” Salixarate derivatives and methods of their preparation are described in greater detail in U.S. Pat. No. 6,200,936 and PCT Publication WO 01/56968.
  • the lubricants of the present invention may also contain pour point depressants. These are known materials and include those based on poly(alkyl(meth)acrylates) where the alkyl group may be long chain groups such as lauryl or stearyl; maleic anhydride/styrene copolymers esterified with aliphatic alcohols of, e.g., 13-16 carbons and optionally further reacted with an amine and optionally including other monomers such methyl methacrylate; alkylated aromatic compounds such as alkylated naphthalene; and copolymers of vinyl acetate with esters such as C18-22 fumarates.
  • the amount of pour point depressant may be 0.1 to 0.5 or 0.2 to 0.4 percent by weight.
  • corrosion inhibitors e.g., triazoles such as tolyltriazole, or thiadiazoles such as dimercaptothiadiazoles and derivatives thereof
  • dyes e.g., dyes, fluidizing agents, odor masking agents, and antifoam agents.
  • Organic borate esters and organic borate salts may also be included.
  • Seal swell agents such as sulfolanes (e.g., thiophene, 3-(decyloxy) tetrahydro-1,1-dioxide) or phthalate esters (e.g., dihexyl phthalates) may be also present, typically in amounts of 0.1% or more, e.g., 0.1 to 2.5 or 0.2 to 2.0 percent.
  • hydrocarbyl substituent or “hydrocarbyl group” is used in its ordinary sense, which is well-known to those skilled in the art. Specifically, it refers to a group having a carbon atom directly attached to the remainder of the molecule and having predominantly hydrocarbon character.
  • hydrocarbyl groups include:
  • hydrocarbon substituents that is, aliphatic (e.g., alkyl or alkenyl), alicyclic (e.g., cycloalkyl, cycloalkenyl) substituents, and aromatic-, aliphatic-, and alicyclic-substituted aromatic substituents, as well as cyclic substituents wherein the ring is completed through another portion of the molecule (e.g., two substituents together form a ring);
  • aliphatic e.g., alkyl or alkenyl
  • alicyclic e.g., cycloalkyl, cycloalkenyl
  • aromatic-, aliphatic-, and alicyclic-substituted aromatic substituents as well as cyclic substituents wherein the ring is completed through another portion of the molecule (e.g., two substituents together form a ring);
  • substituted hydrocarbon substituents that is, substituents containing non-hydrocarbon groups which, in the context of this invention, do not alter the predominantly hydrocarbon nature of the substituent (e.g., halo (especially chloro and fluoro), hydroxy, alkoxy, mercapto, alkylmercapto, nitro, nitroso, and sulfoxy);
  • hetero substituents that is, substituents which, while having a predominantly hydrocarbon character, in the context of this invention, contain other than carbon in a ring or chain otherwise composed of carbon atoms.
  • Heteroatoms include sulfur, oxygen, nitrogen, and encompass substituents as pyridyl, furyl, thienyl and imidazolyl.
  • no more than two, preferably no more than one, non-hydrocarbon substituent will be present for every ten carbon atoms in the hydrocarbyl group; typically, there will be no non-hydrocarbon substituents in the hydrocarbyl group.
  • Lubricant formulations of a type generally suitable for use in automatic transmission fluids are prepared with certain variations as detailed below. Each formulation is prepared in a mixture of API Group II and Group III oils and each contains 250 ppm red dye and 27-28 ppm commercial foam inhibitor. The formulations also contain 1.4 weight percent nitrogen- and sulfur-containing antioxidants, 0.2 wt. % nitrogen-containing friction modifiers, 0.15 wt. % (meth)acrylic polymer pour point depressant, 0.11 wt. % dialkyl hydrogen phosphite, 0.1 wt. % phosphoric acid (85%), and 0.02 wt. % corrosion inhibitor. Additional components are shown in the following Table:
  • Example 1 2* 3* 4* 5 6* 7 8* 9* “DA” dispt a 2.07 2.07 3.08 3.08 2.07 “Cl” dispt b 2.44 2.44 2.44 2.44 2.44 DVM low N c 1.65 1.65 1.65 DVM high N d 1.65 1.65 1.65 1.65 1.65 Test results
  • Certain of the formulations are subject to an oxidation test to evaluate undesirable increase in viscosity of lubricants due to oxidative deterioration.
  • the test comprises treating a sample of the oil with 200 ppm copper and 250 ppm iron and heating under air purging for about 500 hours at 157° C.
  • the viscosity (kinematic viscosity, 100° C.) of the sample after the oxidation treatment is compare with that before treatment, and the results are expressed in terms of percent change in viscosity.
  • the results (example 1 versus comparative examples 2, 3, and 4; example 5 versus comparative example 6) show no increase in viscosity and in fact a modest reduction in viscosity.
  • GM oxidation test is a part of the specification for fluids for certain General Motors automatic transmissions
  • the test utilizes a motored 4L60E automatic transmission run at steady state conditions (1755 RPM and 163° C.) for 450 hours.
  • This analysis includes viscosity, total acid number (TAN), and elemental analysis.
  • TAN total acid number
  • elemental analysis includes viscosity, total acid number (TAN), and elemental analysis.
  • the transmission is also disassembled and the forward clutch piston and housing are both rated for sludge build up on a scale of 1 to 10, with higher numbers representing superior performance. All of these parameters give an indication on the level of oxidation occurring in the automatic transmission fluid.
  • each chemical component is presented exclusive of any solvent or diluent oil, which may be customarily present in the commercial material, unless otherwise indicated. It is to be understood that the upper and lower amount, range, and ratio limits set forth herein may be independently combined. Similarly, the ranges and amounts for each element of the invention can be used together with ranges or amounts for any of the other elements. As used herein, the expression “consisting essentially of” permits the inclusion of substances that do not materially affect the basic and novel characteristics of the composition under consideration.

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WO2019036671A1 (en) * 2017-08-18 2019-02-21 Ecolab Usa Inc. INHIBITORS OF KINETIC HYDRATES FOR CONTROLLING THE FORMATION OF HYDRATE GAS IN WET GAS SYSTEMS

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