WO2019036285A1 - Composition lubrifiante pour une transmission de véhicule électrique hybride - Google Patents

Composition lubrifiante pour une transmission de véhicule électrique hybride Download PDF

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Publication number
WO2019036285A1
WO2019036285A1 PCT/US2018/046187 US2018046187W WO2019036285A1 WO 2019036285 A1 WO2019036285 A1 WO 2019036285A1 US 2018046187 W US2018046187 W US 2018046187W WO 2019036285 A1 WO2019036285 A1 WO 2019036285A1
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Prior art keywords
ester
lubricant composition
acid
composition
alkyl
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PCT/US2018/046187
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English (en)
Inventor
William D. Abraham
Masafumi TSUBOSAKA
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The Lubrizol Corporation
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Publication date
Application filed by The Lubrizol Corporation filed Critical The Lubrizol Corporation
Priority to JP2020508496A priority Critical patent/JP7204738B2/ja
Priority to CA3072337A priority patent/CA3072337A1/fr
Priority to EP18760166.1A priority patent/EP3668959B1/fr
Priority to US16/637,988 priority patent/US20200216774A1/en
Priority to CN201880059959.9A priority patent/CN111108182B/zh
Priority to KR1020207006533A priority patent/KR102669569B1/ko
Publication of WO2019036285A1 publication Critical patent/WO2019036285A1/fr

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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
    • C10M163/00—Lubricating compositions characterised by the additive being a mixture of a compound of unknown or incompletely defined constitution 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02—Hydroxy compounds
    • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/026—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings with tertiary alkyl groups
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/24—Epoxidised acids; Ester derivatives 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/26—Overbased carboxylic acid salts
    • C10M2207/262—Overbased carboxylic acid salts derived from hydroxy substituted aromatic acids, e.g. salicylates
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/281—Esters of (cyclo)aliphatic monocarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/285—Esters of aromatic polycarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/287—Partial esters
    • C10M2207/289—Partial esters containing free hydroxy groups
    • 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
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
    • C10M2209/084—Acrylate; Methacrylate
    • 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
    • C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
    • C10M2215/064—Di- and triaryl 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
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
    • C10M2219/046—Overbasedsulfonic acid salts
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/10—Heterocyclic compounds containing sulfur, selenium or tellurium compounds in the ring
    • C10M2219/104—Heterocyclic compounds containing sulfur, selenium or tellurium compounds in the ring containing sulfur and carbon with nitrogen or oxygen in the ring
    • C10M2219/106—Thiadiazoles
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
    • C10M2223/049—Phosphite
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2227/00—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
    • C10M2227/06—Organic compounds derived from inorganic acids or metal salts
    • C10M2227/061—Esters derived from boron
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • 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
    • C10N2030/02—Pour-point; Viscosity index
    • 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
    • C10N2030/40—Low content or no content compositions
    • 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
    • C10N2030/40—Low content or no content compositions
    • C10N2030/42—Phosphor free or low phosphor content compositions
    • 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
    • C10N2030/40—Low content or no content compositions
    • C10N2030/44—Boron free or low content boron compositions
    • 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
    • C10N2040/14—Electric or magnetic purposes
    • C10N2040/16—Dielectric; Insulating oil or insulators

Definitions

  • the disclosed technology relates to a lubricant composition for use in an automatic transmission of a hybrid electric vehicle, containing an oil of lubricating viscosity, at least one borate ester, and at least one phosphorus containing compound.
  • ATFs automatic transmission fluids
  • Many additive components are typically included in an ATF, providing such performance characteristics as lubrication, dispersancy, friction control (for clutches), anti- wear durability (e.g., gear wear) and pump durability, fuel economy, anti-shudder performance, anti-corrosion and anti -oxidation performance.
  • the additive components are consumed which may detrimentally damage transmissions.
  • lubricants for transmissions in electric vehicles can come into contact with electric componentry in the vehicle, such as parts of the electric motor.
  • one attribute desirable for such lubricants is a relatively low electrical conductivity to avoid potential current leakage and case resistance, particularly as the lubricant oil ages.
  • the lubricant must still provide proper lubrication, including, for example, dispersancy, cleanliness, anti-wear and anti-corrosion. Li kewise, it is desirable to maintain a low viscosity fluid for such vehicles to improve the vehicle efficiency. Accordingly, new transmission fluids are needed to achieve these often competing results.
  • the disclosed technology provides a lubricant composition having a kine- matic viscosity at 40°C of from 8 cSt to 18 cSt, the lubricant composition comprising an oil of lubricating viscosity, from 0.3 to 2.0 wt % of at least one borate ester, and at least one phosphorous containing compound present in an amount to deliver 100 to 450 ppm of phosphorus to the lubricating composition.
  • the borate ester can be a compound of formula I,
  • each R independently, is a C 3 to C 12 alkyl.
  • the phosphorous containing compound can include at least one of: (1) a C 3-8 hydrocarbyl phosphite, (2) a phosphite ester composition that comprises the reaction product of a monomeric phosphorous acid or an ester thereof with at least two alkylene diols, or (3) mixtures of (1) and (2).
  • the lubricant composition can further include 0.01 to 1.0 wt % of an ester of (1) a polyol, and 2) an aliphatic carboxylic acid containing about 12 to about 24 carbon atom, such as, for example, glycerol monooleate.
  • the lubricant composition can also include 0.1 to 3.0 wt % of an ester of (1) an alcohol, and 2) an aliphatic carboxylic acid containing about 4 to about 8 carbon atoms, such as, for example, an adipate ester.
  • the lubricant composition can contain 0.01 wt % to 0.5 wt % of a dimercaptothiadiazole or derivative thereof.
  • the lubricant composition can also contain from 0.1 wt % to 5 wt % of a poly(meth)acrylate ester polymer viscosity modifier.
  • the composition can contain a total amount of dis- persant of 1 wt.% or less.
  • the lubricant composition can additionally include 0.05 wt % to 1.0 wt % of a C12 to C24 hydrocarbyl phosphite.
  • the lubricant composition can also include 0.01 wt % to 1.0 wt % of a C12- 24 borated epoxide.
  • the lubricant composition can also include 0.1 wt % to 3.0 wt % of a mixture of at least two antioxidants selected from hindered phenols, aryl amines, and sulfur containing antioxidants.
  • the lubricant composition can be employed in a method of lubricating an automatic transmission, by supplying the lubricant composition to the automatic transmission, and operating the automatic transmission.
  • the lubricant composition can be employed to provide lubrication in an automatic transmission for a hybrid electric vehicle.
  • the composition can include, among other things, an oil of lubricating viscosity, at least one borate ester and a sufficient amount of at least one phosphorous containing compound to deliver 100 to 450 ppm of phosphorus to the lubricating composition.
  • the oil of lubricating viscosity may be defined as specified in the Ameri- can Petroleum Institute (API) Base Oil Interchangeability Guidelines.
  • the five base oil groups are as follows: Group I (sulphur content >0.03 wt %, and/or ⁇ 90 wt % saturates, viscosity index 80-120); Group II (sulphur content ⁇ 0.03 wt %, and >90 wt % saturates, viscosity index 80-120); Group III (sulphur content ⁇ 0.03 wt %, and >90 wt % saturates, viscosity index >120); Group IV (all polyalphaolefins (PAOs)); and Group V (all others not included in Groups I, II, III, or IV).
  • the oil of lubricating viscosity can include, for example, an API Group I, Group II, Group III, Group IV, Group V oil or mixtures thereof.
  • the oil of lubricating viscosity is an API Group I, Group II, Group III, Group IV oil or mixtures thereof.
  • the oil of lubricating viscosity can be an API Group II, Group III or Group IV oil or mixtures thereof.
  • the oil of lubricating viscosity may be prepared by a Fischer-Tropsch gas-to-liquid synthetic procedure as well as other gas-to-liquid oils.
  • the oil of lubricating viscosity may be an API Group IV oil.
  • the amount of Group IV oil may be 0 wt % to 20 wt %, or 0.1 wt % to 20 wt %, or 1 wt % to 15 wt %, or 5 to 10 wt % of the lubricating composition.
  • the amount of the oil of lubricating viscosity present is typically the balance remaining after subtracting from 100 wt % the sum of the amount of performance additives of the present invention.
  • the lubricating composition may be in the form of a concentrate and/or a fully formulated lubricant. If the performance additives of this invention are in the form of a concentrate (which may be combined with additional oil to form, in whole or in part, a finished lubricant), the ratio of the performance additives to the oil of lubricating viscosity and/or to diluent oil include the ranges of 1 :99 to 99: 1 by weight, or 80:20 to 10:90 by weight.
  • the lubricant composition can contain a boron-containing compound in an amount sufficient to provide from about 75ppm to about 500 ppm of boron to the lubricant composition, or from about 85 to about 450 ppm or about 95 to about 350 ppm boron, or from about 100 to about 400ppm boron to the lubricant composition.
  • the boron can be delivered by many types of boron-containing compounds.
  • the boron-containing compound can be a dispersant post-treated with a source of boron.
  • Such dispersants are generally obtained by reacting a carboxylic (e.g., succinimide), amine or Mannich dispersant with a boron compound reagent, such as boric acid (to give "borated dispersants").
  • a carboxylic e.g., succinimide
  • amine or Mannich dispersant e.g., amine or Mannich dispersant
  • boric acid e.g., boric acid
  • the borated dispersant may be further func- tionalized with a sulfur or phosphorus moiety.
  • the dispersant component in the borated dispersant may be a mixture of multiple dispersants which may be of different types; optionally at least one may be a succinimide dispersant.
  • the borated dispersant may be a borated polyisobutylene succinimide dispersant, in which the polyisobutylene portion thereof may have a number average molecular weight of 750 to 2200, or 750 to 1350, or 750 to 1 150.
  • the borated dispersant(s) may be prepared in such a way to have a N:CO ratio of 0.9: 1 to 1.6: 1, or 0.95: 1 to 1.5 : 1, or 1 : 1 to 1.4: 1.
  • the amount of borated dispersant in the compositions may be, for in- stance, 0.05 to 2.0 percent by weight. In other embodiments, the amount is 0.1 to 1.0 percent or 0.15 to 0.75 percent of the final blended fluid formulation.
  • the boron-containing compound can include boron containing friction modifiers, such as, for example, borated fatty epoxides, borated glycerol esters, and borated alkoxylated fatty amines.
  • the boron containing compound can also include borated detergents.
  • the borated detergents can include, for example, overbased borated materials, which are described in U. S. Patents 5,403,501 and 4,792,410.
  • the boron containing compound can also include a borate ester.
  • the borate ester may be a compound represented by one or more of the formulae:
  • each R can be, independently a hydrocarbyl group, as that term is defined herein, and any two adjacent R groups may together form a cyclic group. Mixtures of two or more of the foregoing may be used.
  • the total number of carbon atoms in the R groups in each formula should be sufficient to render the compound soluble in the oil of lubricating viscosity. Generally, the total number of carbon atoms in the R groups is at least about 3, and in one embodiment at least about 5, and in one embodiment at least about 8. There is no limit to the total number of carbon atoms in the R groups that is required, but a practical upper limit is about 400 or about 500 carbon atoms.
  • each R can independently be a hydrocarbyl group containing 1 to 14, or from 2 to 13 or even 3 to 10 or 12 carbon atoms, provided the sum total number of carbon atoms in all R is 3 or more, preferably 4 or more and even more preferably 6 or more.
  • each R independently, can be a C 3 to C22, or C 3 to Ci8, or C 3 to C 12 alkyl.
  • R groups examples include isopropyl, n-butyl, isobutyl, amyl, 4-methyl-2-pentyl, 2-ethyl-l -hexyl, isooctyl, decyl, dodecyl, 2-propylheptyl, tetradecyl, 2-pentenyl, dodecenyl, phenyl, naphthyl, alkylphenyl, and the like.
  • borate ester examples include, for example, tripropyl borate, tributyl borate, tripentyl borate, trihexyl borate, triheptyl borate, trioctyl borate, trinonyl borate and tridecyl borate.
  • Other borate ester examples can include, for example, the compound of formula I, wherein each R is, independently, a C 3 to C22, or C 3 to Ci8, or C 3 to C 12 alkyl, such as, for example, tri-2-ethylhexyl borate, tris(2- propylheptyl) borate and mixtures thereof.
  • the borate ester can be a C 8 borate ester, or a C 10 borate ester. In one embodiment the borate ester can be tris(2 -propylheptyl) borate. In some embodiments the borate ester can be tri-2- ethylhexyl borate.
  • the borated ester can be represented by the formula B(OC5Hii) 3 or B(OC4H ) 3 . In one embodiment, the borated ester can be tri-n-butyl borate.
  • the borated ester can be a phenolic compound represented by the formula
  • Ri, R 2 , R 3 and R 4 are independently hydrocarbyl groups of 1 to about 12 carbon atoms; and R 5 and R 6 are independently alkylene groups of 1 to about 6 carbon atoms, and in one embodiment about 2 to about 4 carbon atoms, and in one embodiment about 2 or about 3 carbon atoms.
  • Ri and R 2 independently contain 1 to about 6 carbon atoms, and in one embodiment each is a t- butyl group.
  • R 3 and R 4 are independently hydrocarbyl groups of about 2 to about 12 carbon atoms, and in one embodiment about 8 to about 10 carbon atoms.
  • R 5 and R 6 are independently — CH 2 CH 2 — or —
  • the borated ester can be a compound represented by the formula:
  • each R is independently hydrogen or a hydrocarbyl group.
  • Each of the hydrocarbyl groups may contain from 1 to about 12 carbon atoms, and in one embodiment 1 to about 4 carbon atoms.
  • An example is 2,2'-oxy-bis-(4,4,6-time- thyl-l,3,2-dioxaborinane).
  • the borate ester may be employed in the lubricant composition at about 0.2 or 0.3 to about 2.0 wt.% based on the weight of the lubricant composition, or in some cases about 0.35 to 2.0 wt.%, and in one embodiment from about 0.25 to about 1.0 wt.%), and in one embodiment about 0.25 to about 0.75 wt.%>.
  • the lubricant composition contains at least one phosphorous containing compound.
  • the phosphorus-containing compound may be an acid, salt or ester.
  • the phosphorus-containing compounds are in the form of a mixture of two or three, or two to four (typically two or three) phosphorus-containing compounds.
  • the phosphorus-containing compound is a phosphite. Suitable phosphites include those having at least one hydrocarbyl group with 3 or 4 or more, or 8 or more, or 12 or more, carbon atoms.
  • the phosphite may be a mono-hydrocarbyl substituted phosphite, a di -hydrocarbyl substituted phosphite, or a tri -hydrocarbyl substituted phosphite.
  • the phosphite is sulphur-free i.e., the phosphite is not a thiophosphite.
  • the phosphite may be represented by the formulae:
  • R may be a hydrocarbyl group containing at least 3 carbon atoms and the other R groups may be hydrogen.
  • two of the R groups are hydrocarbyl groups, and the third is hydrogen.
  • every R group is a hydrocarbyl group, i.e., the phosphite is a tri -hydrocarbyl substituted phosphite.
  • the hydrocarbyl groups may be alkyl, cycloalkyl, aryl, acyclic or mixtures thereof.
  • the R hydrocarbyl groups may be linear or branched, typically linear, and saturated or unsaturated, typically saturated.
  • the phosphorus-containing compound can be a C3-8 hydrocarbyl phosphite, or mixtures thereof, i.e., wherein each R may independently be hydrogen or a hydrocarbyl group having 3 to 8, or 4 to 6 carbon atoms, typically 4 carbon atoms.
  • the C3-8 hydrocarbyl phosphite comprises dibutyl phosphite.
  • the C3-8 hydrocarbyl phosphite may deliver at least 175 ppm, or at least 200 ppm of the total amount of phosphorus delivered by the phosphorus-containing compounds.
  • the C3-8 hydrocarbyl phosphite may deliver at least 45 wt %, or 50 wt % to 100 wt %, or 50 wt % to 90 wt % or 60 wt % to 80 wt % of the total amount of phosphorus from the phosphorus-containing compound.
  • the phosphorus-containing compound can be a C 12-22 hydrocarbyl phosphite, or mixtures thereof, i.e., wherein each R may independently be hydrogen or a hydrocarbyl group having 12 to 24, or 14 to 20 carbon atoms, typically 16 to 18 carbon atoms.
  • the C 12-22 hydrocarbyl phosphite comprises a C 16-18 hydrocarbyl phosphite.
  • alkyl groups for R 3 , R 4 and R 5 include octyl, 2-ethylhexyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, octadecenyl, nonadecyl, eicosyl or mixtures thereof.
  • the C 12-22 hydrocarbyl phosphite may be present in the lubricant composition at about 0.05 wt.% to about 1.0 wt.% of the lubricant composition, or from about 0.1 wt.%) to about 0.5 wt.%> of the lubricant composition.
  • the phosphorous containing compound can include both a C3-8 and a C 12 to C24 hydrocarbyl phosphite.
  • the phosphorus containing compound can be a phosphite ester composition that is the reaction product, e.g., condensation product, of a monomeric phos- phorous acid or an ester thereof with at least two alkyl ene diols.
  • the foregoing phosphite ester does not contain zinc.
  • monomeric phosphorous acid or ester a phosphorous acid or ester, typically containing one phosphorus atom, which may be reacted with a diol in order to form an oligomeric, polymeric, or other condensed species.
  • the mono- meric phosphorous acid or ester thereof may be phosphorous acid itself (H3PO3), although a monomeric partial ester such as a dialkylphosphite may be used for ease of handling or other reasons.
  • the alkyl group or groups may be relatively low molecular weight groups of 1 to 6 or 1 to 4 carbon atoms, such as methyl, ethyl, propyl, or butyl, such that the alcohol generated upon reaction with the alkylene diols may be easily removed.
  • An exemplary phosphorous acid ester is dimethyl phosphite; others include diethyl phosphite, dipropyl phosphite, and dibutyl phosphite. Sulfur-containing analogues may also be employed (e.g., thiophosphites). Other esters include trialkyl phosphites. Mixtures of di-and trialkyl phosphites may also be useful. In these materials, the alkyl groups may be the same or different each independently typically having 1 to 6 or 1 to 4 carbon atoms as described above.
  • the monomeric phosphorus acid or ester will be reacted or condensed with at least two alkylene diols to form a phosphorus containing compound, which may include a polymeric (or oligomeric) phosphorus ester and optionally monomeric species.
  • the first alkylene diol (i) will be a 1 ,4- or 1 ,5- or 1 ,6- alkylene diol. That is to say, there will be two hydroxy groups in a 1,4 or 1,5 or 1 ,6 relationship to each other, separated by a chain of 4, 5, or 6 carbon atoms, respectively.
  • the first hydroxy group may be literally on the 1 carbon atom, that is, on the a carbon of the diol, or it may be on a higher numbered carbon atom.
  • the diol may also be a 2,5- or 2,6-, or 2,7-diol or a 3,6- or 3,7- or 3,8-diol, as will be evident to the skilled person.
  • the alkylene diol may be branched (e.g., alkyl- substituted) or unbranched and in one embodiment is unbranched.
  • linear diols include 1,4- butanediol, 1,5-pentane diol, and 1,6-hexanediol.
  • Branched or substituted diols include 1,4-pentanediol, 2-methyl-l,5-pentanediol, 3-methyl-l,5-pentanediol, 3 ,3 -dimethyl -1,5 -pentanediol , 1,5-hexanediol, 2,5-hexanediol, and 2,5-dimethyl-2,5-hex- anediol.
  • a diol having one or more secondary hydroxy groups may be referred to as a branched or substituted diol, even though the carbon chain itself may be linear.
  • the location of the hydroxy groups in the 1,4-, 1,5-, or 1,6- positions may be helpful to promote oligomerization with the phosphorous species rather than formation of cyclic structures (which would be sterically disfavored).
  • the first alkylene diol may be 1 ,6-hexanediol.
  • the first alkylene dihydroxy compound (diol) may, if desired, have additional hydroxy groups, that is, more than two per molecule, or there may be exactly two. In one embodiment, there are exactly two hydroxy groups per molecule. If there are more than two hydroxy groups, care should be taken to assure that there is no excessive cyclization such as might interfere with the polymerization reaction, if there are fewer than 4 atoms separating any of the hydroxy groups. Also, care should be taken to avoid excessive branching or crosslinking in the product, which could lead to undesirable gel formation. Such problems may be avoided by careful control of reaction conditions such as control of the ratio of reagents and the order of their addition, performing the reaction under suitably dilute conditions, and reacting under low acid conditions.
  • the phosphorous acid or ester is also reacted with a second alkylene diol (ii).
  • the second alkylene diol is an alkyl-substituted 1,3 -propylene diol with one or more of the alkyl substituents thereof being on one or more of the carbon atoms of the propylene unit, the total number of carbon atoms in the alkyl-substituted 1 ,3- propylene diol being 5 to 12 or 6 to 12 or 7 to 1 1 or 8 to 18 or, in certain embodiments, 9. That is, the alkyl-substituted 1 ,3 -propylene diol may be represented by the general formula
  • the various R groups may be the same or different and may be hydrogen or an alkyl group, provided that at least 1 R is an alkyl group and that the total number of carbon atoms in the R groups is 2 to 9 or 3 to 9, so that the total carbon atoms in the diol will be 5 to 12 or 6 to 12, respectively, and likewise for the other ranges of total carbons.
  • 1 ,4-, 1,5-, or 1,6-diols reference here to 1 ,3-diols means that the two hydroxy groups are in a 1,3 relationship to each other, that is, separated by a chain of 3 carbon atoms.
  • a 1,3-diol may thus also be named as a 2,4- or 3,5-diol. If the 1,3-diol has one or more secondary hydroxy groups, such a molecule will be considered to be a substituted diol.
  • the number of alkyl substituents is 2 and the total number of carbon atoms in the molecule is 9.
  • Suitable substituents may include, for instance, methyl, ethyl, propyl, and butyl (in their various possible isomers).
  • Examples of the second alkylene diol may include 2,2-dimethyl- 1,3 -propanediol, 2-ethyl-2-butylpropane-l,3-diol, 2-ethylhexane- 1,3 -diol, 2,2-dibutylpro- pane- 1 ,3 -diol, 2,2-diisobutylpropane- 1 ,3 -diol, 2-methyl-2-propylpropane- 1 ,3 -diol, 2-propyl-propane-l,3-diol, 2-butylpropane- 1,3 -diol, 2-pentylpropane- 1,3 -diol, 2- methyl-2-propylpropane- 1,3 -diol, 2,2-diethylpropane-l,3-diol, 2,2,4-trimethylpen- tane-l,3-
  • the relative molar amounts of the first alkylene diol (i) and the second alkylene diol (ii) may be in a ratio of 30:70 to 65 :35, or alternatively 35 :65 to 60:40 or 40:60 to 50: 50 or 40:60 to 45 :55. If the ratio is less than about 30:70, the resulting product may not fully exhibit the benefits of the disclosed technology, and if it is greater than about 65 :35, its compatibility with other components in a lubricant formulation may be reduced.
  • the relative molar amounts of the monomeric phosphorous acid or ester thereof (a) and the total molar amounts of the alkylene diols (b) may be in a ratio of 0.9: 1.1 to 1.1 :0.9, or 0.95 : 1.05 to 1.05 :0.95, or 0.98: 1.02 to 1.02:0.98, or about 1 : 1.
  • Reaction in approximately equimolar ratios will tend to encourage formation of oligomers or polymer formation.
  • An exact 1 : 1 ratio could theoretically lead to ex- tremely long chain formation and consequently very high molecular weight. In practice, however, this is not typically attained since competing reactions and incompleteness of reaction will provide materials of a lesser degree of polymerization, and a certain fraction of the material will be in the form of cyclic monomer.
  • the reaction product will typically comprise a mixture of individual spe- cies, including some oligomeric or polymeric species as well as cyclic monomeric species.
  • the cyclic monomeric species may comprise 1 phosphorus atom and one alkylene group, derived principally from the 1,3-diol (ii), as the 1,3-diol is capable of either participation in oligomerization or cyclic ester formation.
  • the oligomeric or polymeric species may typically comprise 2 or 3 to 20 phosphorus atoms, or alter- natively 5 to 10 phosphorus atoms, linked together by alkylene groups derived from the diols (i) and (ii), and may exhibit a relative preference for incorporation of the 1,4-, 1,5-, or 1,6-diols, which are less readily able to cyclize with the phosphorus to form a cyclic monomeric species.
  • the product may be a mixture of species that may be represented by the structures shown:
  • x a d y represent the relative amounts of the two diols incorporated into the oligomer.
  • the structure shown is not intended to indicate that the polymer is necessarily a block polymer, since the structures represented by the x and y brackets may be more or less randomly distributed, as influenced by or depending on the availability of the various diol reactants.
  • Each X is independently a terminating group, which may be, for instance, an alkyl group (such as methyl), or hydrogen or a diol-derived moiety which might terminate in an OH group.
  • diene (i) is selected to be 1,6-hexanediol and diene (ii) is selected to be 2-butyl-2-ethyl- 1,3 -propanediol.
  • diene (ii) is selected to be 2-butyl-2-ethyl- 1,3 -propanediol.
  • Corresponding structures and mixtures would be formed using different diols (i) and (ii).
  • oligomeric species and cyclic monomer species in the reaction mixture will depend, to some extent, on the specific diols selected and the reaction conditions.
  • the amount of oligomeric product may be approximately as shown in the table below:
  • the amount of the cyclic monomer may be 100% minus the percentage of the oligomer. It is also possible that, regardless of the specific diols employed, mixtures having the above weight percentages of oligomer and cyclic monomer may be usefully prepared. In certain embodiments, 55 to 60 weight percent of the product is in oligomeric form and 45 to 40 percent is in cyclic monomer form. In some embodiments the relative amount of the cyclic monomeric species to the amount of the oli- gomeric species is 1 :3 to 1 : 1 or alternatively 1 :3 to 1 :0.8 by weight.
  • the condensation reaction between the phosphorus acid or ester and the diol may be accomplished by mixing the reagents and heating until the reaction is substantially complete.
  • the first and second alkylene diols may be mixed with the phosphorous compound at the same time or nearly the same time, that is, typically before the reaction with one of the alkylene diols is complete.
  • a small amount of a basic material such as sodium methoxide may also be present. If a methyl ester of the phosphorous acid is used as a reagent, substantial completion of the reaction may correspond with the cessation of evolution and distillation of methanol from the reaction mixture.
  • Suitable temperatures include those in the range of 100 to 140°C, such as 1 10 to 130°C or 1 15 to 120°C. If reaction temperatures in excess of about 140°C are employed, there is a risk that the desired product may not be formed in useful yields or with useful purity, since competing reactions may occur. Reaction times may typically be up to 12 hours, depending on temperature, applied pressure (if any), agitation, and other variables. In some instances, reaction times of 2 to 8 hours or 4 to 6 hours may be appropriate.
  • Other monomers may be included within the reaction mixture if desired.
  • the inclusion of a polycarboxylic acid, such as a dicarboxylic acid, is sometimes seen as beneficial.
  • inclusion of a relatively minor amount of tartaric acid or citric acid may provide products with useful properties.
  • the amount of polyacid or diacid may an amount suitable to incorporate at least 1 , or approximately 1 , monomeric unit of poly- or dicarboxylic acid per product oligomer molecule.
  • the amount of polyacid or diacid actually charged to the reaction mixture may be higher than this amount.
  • Suitable polyacids include maleic acid, fumaric acid, tartaric acid, citric acid, phthalic acid, terephthalic acid, malonic acid (e.g., ester), succinic acid, malic acid, adipic acid, oxalic acid, sebacic acid, dodecanedioic acid, glutaric acid, and glutamic acid.
  • Another type of monomer which may be included is a monocarboxylic acid which contains a reactive hydroxy group, or a reactive equivalent of such a material, such as an anhydride, ester, or lactone. Examples include glyoxylic acid, ca- prolactone, valerolactone, and hydroxystearic acid.
  • the amount of the phosphorous ester product described above used in lubricants may be an amount sufficient to provide 0.01 to 0.3 or to 0.1 weight percent phosphorus to the composition or, in other embodiments, 0.02 to 0.07 weight percent or 0.025 to 0.05 weight percent.
  • the actual amount of the product which corresponds to these amounts of phosphorus will, of course, depend upon its phosphorus content.
  • Suitable amounts of the ester product in the lubricant composition may be 0.01 to 1.0 weight percent, or 0.02 to 0.5 weight percent, or 0.03 to 0.30 weight percent, or even 0.05 to 0.25 weight percent.
  • the lubricant composition may also include a mixture of two or more.
  • the phosphorous containing compound can include a C3-8 hydrocarbyl phosphite and a phosphite ester prod- uct.
  • the phosphorous containing compound can include each of a C3-8 hydrocarbyl phosphite, a C 12 to C24 hydrocarbyl phosphite, and a phosphite ester product.
  • the phosphorus containing compound should be present in an amount to deliver 100 to 450 ppm of phosphorus to the lubricant composition.
  • the at least one phosphorus containing compound can be present in an amount to deliver 125 to 425 ppm of phosphorus, or from 150 to 400 ppm phosphorus to the lubricant composition.
  • the ratio of the level of phosphorous from the phosphite ester to the level of boron from the borate ester should be greater than 0.7, or greater than 0.8, or greater than 0.9 or even greater than 1.0.
  • the ratio can be, for example, from 0.7 to 5, or 0.8 to 4, or 0.9 to 3 or 1.0 to 2.
  • the lubricant composition can contain further additives aside from the borate ester and phosphorus containing compound.
  • the lubricant composition can include an ester of a polyol and an aliphatic carboxylic acid containing 12 to 24 carbon atoms.
  • Polyols include diols, triols, and alcohols with higher numbers of alcoholic OH groups.
  • Polyhydric alcohols include ethylene glycols, including di-, tri- and tet- raethylene glycols; propylene glycols, including di-, tri- and tetrapropylene glycols; glycerol; butane diol; hexane diol; sorbitol; arabitol; mannitol; sucrose; fructose; glu- cose; cyclohexane diol; erythritol; and pentaerythritols, including di- and tripentae- rythritol; preferably, diethylene glycol, triethylene glycol, glycerol, sorbitol, pentae- rythritol and dipentaerythritol.
  • the aliphatic carboxylic acids which form the esters are those acids containing 12 to 24 carbon atoms.
  • Such acid can be characterized by the following gen- eral formula Ri— (CO)OH, wherein Ri is a hydrocarbyl group, which can be a straight chain hydrocarbyl group, a branched chain or cyclic-containing hydrocarbyl group, or mixtures thereof.
  • Ri is a hydrocarbyl group, which can be a straight chain hydrocarbyl group, a branched chain or cyclic-containing hydrocarbyl group, or mixtures thereof.
  • Straight chain hydrocarbyl group containing 12 to 24 carbon atoms are preferred, for instance, 14 to 20 or 16 to 18 carbon atoms.
  • Such acids can be used in combination with acids with more or fewer carbon atoms as well.
  • the acid Ri— (CO)OH is a monocarboxylic acid since polycar- boxylic acids tend to form polymeric products if the reaction conditions and amounts of reactants are not carefully regulated. Mixtures of monocarboxylic acids and minor amounts of dicarboxylic acids or anhydrides, however, can be used in preparing the esters.
  • Examples of carboxylic acids include dodecanoic acid, stearic acid, lauric acid, behenic acid, and oleic acid.
  • esters are in particular the monoesters of such polyols and such carboxylic acids.
  • a preferred ester is glycerol monooleate.
  • glycerol monooleate is a mixture which includes such materials as glycerol, oleic acid, other long chain acids, glycerol dioleate, and glycerol trioleate.
  • the commercial material is believed to include about 60 ⁇ 5 percent by weight of the chemical species "glycerol monooleate, " along with 35 ⁇ 5 percent glycerol dioleate, and less than about 5 percent trioleate and oleic acid.
  • the amounts of the monoesters, described below, are calculated based on the actual, corrected, amount of polyol mo- noester present in any such mixture.
  • the amount of the foregoing ester in the lubricant composition is typically on the order of from about 0.01 to about 1.0 wt.%, but can also be from about 0.05 to about 0.5 or 0.8 or about 0. 1 to about 0.6 wt.% of the lubricant composition.
  • the lubricant composition can also contain an ester of an alcohol, and an aliphatic carboxylic acid containing about 4 to about 8 carbon atoms.
  • the alcohol includes both monohydric alcohol and polyhydric alcohol (i.e., polyol).
  • the carbon atoms of the alcohol may be linear, branched, or mixtures thereof.
  • Suitable polyols are the same as mentioned above.
  • the alcohol may be a Guerbet alcohol, or mixtures thereof.
  • the Guerbet alcohols may have alkyl groups including the following: 1) alkyl groups containing C 15-16 polymethylene groups, such as 2-C1-15 alkyl -hexadecyl groups (e.g. 2-octylhexadecyl) and 2-alkyl-octadecyl groups (e.g.
  • alkyl groups containing Cio-12 polymethylene groups such as 2-C1-15 alkyl-dodecyl groups (e.g. 2-octyldodecyl) and 2-C1-15 alkyl-dodecyl groups (2-hexyldodecyl and 2-octyldodecyl), 2-C 1-15 alkyl- tetradecyl groups (e.g.
  • alkyl groups con- taining C 6 -9 polymethylene groups such as 2-C1-15 alkyl-decyl groups (e.g. 2-oc- tyldecyl) and 2,4-di-Ci-i5 alkyl-decyl groups (e.g.
  • alkyl groups containing C 1-5 polymethylene groups such as 2-(3 -methylhexyl)-7-me- thyl-decyl and 2-(l ,4,4-trimethylbutyl)-5,7,7-trimethyl-octyl groups; and 6) and mixtures of two or more branched alkyl groups, such as alkyl residues of oxoalcohols corresponding to propylene oligomers (from hexamer to undecamer), ethylene/propylene (molar ratio 16: 1 - 1 : 1 1) oligomers, iso-butene oligomers (from pentamer to octamer), C5-17 a-olefin oligomers (from dimer to hexamer).
  • Examples of a suitable branched monohydric alcohol include 2-ethylhex- anol, 2-butyloctanol, 2-hexyldecanol, 2-octyldodecanol, 2-decyltetra-decanol, iso- tridecanol, iso-octanol, oleyl alcohol, Guerbet alcohols, or mixtures thereof.
  • Examples of a monohydric linear alcohol include methanol, ethanol, propanol, butanol, pentanol, hexanol, heptanol, octanol, nonanol, decanol, undecanol, dodecanol, tride- canol, tetradecanol, pentadecanol, hexadecanol, heptadecanol, octadecanol, non- adecanol, eicosanol, or mixtures thereof.
  • the monohydric alcohol contains 6 to 30, or 8 to 20, or 8 to 15 carbon atoms (typically 8 to 15 carbon atoms).
  • the aliphatic carboxylic acids which form the esters are those acids con- taining 4 to 8 carbon atoms. While aliphatic, the aliphatic carboxylic acids can contain ethylenic unsaturation along the C 4 to C 8 alkyl group backbone. In addition, such acids can be mono-carboxylic or di-carboxylic acids or anhydrides, or mixtures thereof.
  • carboxylic acids include, for example, succinic acid, maleic acid, fumaric acid, glutaconic acid, glutaric acid, adipic acid, citraconic acid, mesaconic acid, pimelic acid, suberic acid, butyric acid, valeric acid, caproic acid, enanthic acid, caprylic acid and the like.
  • a particularly preferred ester can be an adipate ester, such as, for example, a C 8- i3 or C 8 - i2 adipate ester, such as diisoctyl adipate or di-tridecyl adipate.
  • Other esters can include, for example, pentaerythritol esters, neo-pentyl esters and tri- methyl ol esters.
  • the amount of the foregoing ester in the lubricant composition is typically on the order of from about 0.1 to about 3.0 wt.%, but can also be from about 0.2 to about 2.5 or about 0.3 to about 2.0 wt.% of the lubricant composition.
  • the carboxylic esters are prepared by the very well-known reaction of at least one carboxylic acid (or reactive equivalent thereof, such as ester, halide, or anhydride) with at least one of the above-described hydroxy compounds.
  • Another component of the lubricant composition can be a metal deactivator.
  • metal deactivator examples include 2,5-dimercapto-l,3,4-thiadiazole and/or derivatives thereof. Such materials are described in European Patent Publication 0761805, incorporated herein by reference.
  • metal deactivators that are useful herein reduce the corrosion of metals, such as copper.
  • Metal deactivators are also referred to as metal passivators. These metal deactivators are typically nitrogen and/or sulfur containing heterocyclic compounds, such as dimercaptothiadiazoles, triazoles, aminomercaptothiadiazoles, imidazoles, thiazoles, tetrazoles, hydroxyquinolines, oxazolines, imidazolines, thio- phenes, indoles, indazoles, quinolines, benzoxazines, dithiols, oxazoles, oxatriazoles, pyridines, piperazines, triazines, and derivatives of any one or more thereof.
  • heterocyclic compounds such as dimercaptothiadiazoles, triazoles, aminomercaptothiadiazoles, imidazoles, thiazoles, tetrazoles, hydroxyquinolines, oxazolines, imidazo
  • the metal deactivator preferably comprises at least one triazole, which may be substituted or unsubstituted.
  • suitable compounds are benzotriazole, alkyl-substi- tuted benzotriazole (e.g., tolyltriazole, ethylbenzotriazole, hexylbenzotriazole, oc- tylbenzotriazole, etc.), aryl- substituted benzotriazole (e.g., phenol benzotriazoles, etc.), and alkylaryl- or arylalkyl-substituted benzotriazole and substituted benzotriazoles where the substituent may be hydroxy, alkoxy, halo (especially chloro), nitro, carboxy and carboxy alkoxy.
  • the triazole is a benzotriazole or an alkylben- zotriazole in which the alkyl group contains 1 to about 20 carbon atoms, preferably 1 to about 8 carbon atoms. Benzotriazole and tolyltriazole are useful.
  • the metal deactivator is the reaction product of a dis- persant with a dimercaptothiadiazole.
  • the dispersants may be generally characterized as the reaction products of carboxylic acids with amines and/or alcohols. These reaction products are commonly used in the lubricant arts as dispersants and are sometimes referred to generically as dispersants despite the fact that they may have other uses in addition to or instead of that as dispersants.
  • the carboxylic dispersants include succinimide dispersants, ester type dispersants and the like.
  • Succinimide dispersants are generally the reaction of a polyamine with an alkenyl succinic anhydride or acid.
  • Ester type dispersants are the reaction product of an alkenyl succinic anhydride or acid with a polyol compound. The reaction product may then be further treated with an amine such as a polyamine. Examples of useful dispersants are disclosed in U. S. Pat. Nos. 3,219,666 and 4,234,435, incorporated herein by reference. Useful dispersants also include the ashless dispersants discussed below. Generally, the reaction occurs between the dispersant and the dimercaptothiadiazole by mixing the two and heating to a temperature above about 100 °C. U.S. Pat. Nos. 4, 140,643 and 4, 136,043 describe compounds made by the reaction of such dispersants with a dimercaptothiadiazole. These patents are incorporated herein by reference for their disclosure of dispersants, dimercaptothiadiazole, the method for reacting the two and the products obtained from such reaction.
  • the metal deactivator is the reaction product of a phenol with an aldehyde and a dimercaptothiadiazole.
  • the phenol is preferably an alkyl phenol wherein the alkyl group contains at least about 6, preferably from 6 to about 24, more preferably about 6, or about 7, to about 12 carbon atoms.
  • the aldehyde is preferably an aldehyde containing from 1 to about 7 carbon atoms or an aldehyde synthon, such as formaldehyde.
  • the aldehyde is formaldehyde or paraformaldehyde.
  • the aldehyde, phenol and dimercaptothiadiazole are typically reacted by mixing them at a temperature up to about 150 °C, preferably about 50 °C to about 130 °C, in molar ratios of about 0.5 to about 2 moles of phenol and about 0.5 to about 2 moles of aldehyde per mole of dimercaptothiadiazole.
  • the three reagents are reacted in equal molar amounts.
  • the metal deactivator is a bis(hydrocarbyldithio)thia- diazole.
  • each hydrocarbyl group is independently an alkyl, aryl or aralkyl group, having from 6 to about 24 carbon atoms.
  • Each hydrocarbyl can be independently t-octyl, nonyl, decyl, dodecyl or ethylhexyl.
  • the metal deactivator can be bis-2,5-tert-octyl-dithio-l,3,4-thiadiazole or a mixture thereof with 2-tert-octylthio- 5-mercapto-l,3,4-thiadiazole.
  • dithiothiadiazole compounds are disclosed as Component (d) in PCT Publication WO 88/03551, incorporated by reference for its disclosure of dithiothiadiazole compounds.
  • the metal deactivator is a dimercaptothiadiazole derivative.
  • D-l and D-2 are specific examples.
  • the amount of metal deactivator in the lubricant composition is generally in the range of about 0.01 to about 0.5 wt.% by weight of the lubricant composition. In some embodiments, the amount of the metal deactivator is in the range of about 0.02 to about 0.42 wt.% or about 0.03 to about 0.33 wt,% or about 0.04 to about 0.24 wt.% by weight of the lubricant composition.
  • the lubricant composition can also contain a poly(meth)acrylate polymer viscosity modifier.
  • a poly(meth)acrylate polymer viscosity modifier As used herein ranges below for the viscosity modifier are measured by GPC using polystyrene standards with a weight average molecular weight ranging from 350 to 2,000,000.
  • the lubricant composition in one embodiment includes a linear poly(meth)acrylate polymer with a weight average molecular weight of 5,000 to 25,000, or 8000 to 20,000.
  • the linear poly(meth)acrylate polymer may be present in the lubricant composition at about 0.1 wt % to about 5 wt %, or 0.1 wt % to 4 wt %, or 0.2 wt % to 3 wt %, or 0.5 wt % to 3 wt %, 0.5 wt % to 4 wt % of the lubricating composition.
  • the poly(meth)acrylate polymer may be derived from a monomer compo- sition comprising:(a) 50 wt % to 95 wt %, or 60 wt % to 80 wt % of an alkyl (meth)acrylate, wherein the alkyl group of the (meth)acrylate has 10 to 15 carbon atoms; (b) 1 wt % to 40 wt %, or 4 wt % to 35 wt % of an alkyl (meth)acrylate, wherein the alkyl group of the (meth)acrylate has 1 to 9 carbon atoms; (c) 1 wt % to 10 wt %, or 1 wt % to 8 wt % of a monomer having dispersant functionality, (d) 0 wt % to 4 wt %, or 0 wt % to 2 wt %, or 0 wt % of a vinyl aromatic
  • the linear polymer includes a poly(meth)acrylate (typically a polymethacrylate) with units derived from a mixture of alkyl (meth) aery late ester monomers containing, (a) 8 to 24, or 10 to 18, or 12 to 15 carbon atoms in the alcohol-derived portion of the ester group and (b) 6 to 1 1, or 8 to 1 1, or 8 carbon atoms in the alcohol-derived portion of the ester group, and which have 2-(Ci-4 alkyl)-sub- stituents, and optionally, at least one monomer selected from the group consisting of (meth)acrylic acid esters containing 1 to 7 carbon atoms in the alcohol-derived portion of the ester group and which are different from (meth)acrylic acid esters (a) and (b), vinyl aromatic compounds (or vinyl aromatic monomers); and nitrogen-containing vinyl monomer; provided that no more than 60% by weight, or no more than 50% by weight, or no more than 35% by weight of the esters contain
  • the linear polymer of this type is described in more detail in US 6, 124,249, or EP 0 937 769 Al paragraphs [0019] and [0031] to [0067].
  • the linear polymer may further contain a third monomer.
  • the third monomer may be styrene, or mixtures thereof.
  • the third monomer may be present in an amount 0% to 25% of the polymer composition, or from 1% to 15% of the composition, 2% to 10% of the composition, or even from 1% to 3% of the composition.
  • the mole ratio of esters (a) to esters (b) in the copolymer ranges from 95 : 5 to 35 :65, or 90: 10 to 60:40, or 80:20 to 50:50.
  • the esters are usually aliphatic esters, typically alkyl esters.
  • the ester of (a) may be a C 12-15 alkyl (meth)acrylate and the ester of (b) may be 2-ethylhexyl (meth)acrylate.
  • the ester groups in ester (a) contain branched alkyl groups.
  • the ester groups may contain 2 to 65%, or 5 to 60% of the ester groups having branched alkyl groups.
  • the branched alkyl groups may be ⁇ -branched and may contain 8 to 60, or 8 to 30, or 8 to 16 carbon atoms.
  • branched alkyl groups may be derived from 2-ethylhexanol, 2-butyloctanol, 2-hexyldecanol, 2-oc- tyldodecanol, 2-decyltetradecanol, or mixtures thereof, or commercially available alcohols such as Isofol® branched Guerbet alcohols available from Sasol.
  • the C 1-4 alkyl substituents may be methyl, ethyl, and any isomers of propyl and butyl.
  • the weight average molecular weight of the linear poly(meth)acrylate may be 45,000 or less, or 35,000 or less, or 25,000 or less, or 8000 to 25,000, or, 10,000 to 35,000, or 12,000 to 20,000.
  • the linear polymer may be called a viscosity modifier, or a dispersant viscosity modifier as it may exhibit dispersant functionality.
  • a dispersant viscosity modifier herein is exclusive of dispersants, which are a separate class of compounds.
  • the linear polymer may be used as a sole viscosity modifier (or dispersant viscosity modifier) present at 0.5 wt % to 4 wt % of a linear (meth)acrylic polymer viscosity modifier having dispersant functionality, wherein the linear polymer has a weight average molecular weight of 5,000 to 25,000, or 10,000 to 20,000, and wherein oil the of lubricating viscosity has a kinematic viscosity at 100°C of 2.8 to 3.1 cSt (mm 2 /s) and a viscosity index of 104 to 130.
  • the lubricant composition in one embodiment may contain only two linear polymer viscosity modifiers having dispersant functionality, wherein the linear polymer has a weight average molecular weight of 5,000 to 25,000, or 10,000 to 20,000,
  • the lubricating composition may comprise 0.1 wt% to 4 wt % (or 0.2 wt % to 3 wt %) of a linear (meth)acrylic polymer viscosity modifier having dispersant functionality, wherein the linear polymer has a weight average molecular weight of greater than 25,000 to 400,000 (or to 350,000) or 30,000 to 150,000.
  • the linear (meth)acrylic polymer a weight average molecular weight of greater than 25,000 to 400,000 (or to 350,000) may be considered chemically similar to the linear (meth)acrylic polymer a weight average molecular weight of 5,000 to 25,000 except the weight average molecular weight is different.
  • the lubricating composition may comprise a linear polymer viscosity modifier having dispersant functionality comprises: 0.1 wt % to 4 wt % (or 0.2 wt % to 3 wt %) of a linear (meth)acrylic polymer viscosity modifier having dispersant functionality, wherein the linear polymer has a weight average molecular weight of 10,000 to 20,000; and 0.1 wt % to 4 wt % (or 0.2 wt % to 3 wt %) of a linear (meth)acrylic polymer viscosity modifier having dispersant functionality, wherein the linear polymer has a weight average molecular weight of greater than 20,000 to 250,000 (or 30,000 to 150,000).
  • the molecular weight of the viscosity modifier has been determined using known methods, such as GPC analysis using polystyrene standards. Methods for determining molecular weights of polymers are well known. The methods are described for instance: (i) P.J. Flory, “Principles of star polymer Chemistry", Cornell University Press 91953), Chapter VII, pp 266-315; or (ii) "Mac- romolecules, an Introduction to star polymer Science", F. A. Bovey and F. H. Wins- low, Editors, Academic Press (1979), pp 296-312. [00101] Another component of the present invention is a borated epoxide containing 12-24 carbon atoms. This material can alternatively described as a borate ester of a vicinal diol containing 12 to 24 carbon atoms. Such a material may be represented by the structures
  • each of R 1 , R 2 , R 3 , and R 4 are independently hydrogen or an aliphatic radical, or any two thereof together with the carbon atom or atoms to which they are attached form a cyclic radical.
  • at least one of the R groups is an alkyl group containing at least 8 or at least 10 carbon atoms.
  • one of the R groups is such an alkyl group and the remaining R groups are hydrogen.
  • Borated epoxides are described in detail in U.S. Pat. No. 4,584, 1 15. Borated epoxides are generally prepared by reacting an epoxide with a boron source such as boric acid or boron trioxide.
  • Borated epoxides are not themselves epoxides, but are the ring-opened boron-containing reaction products of epoxides. Suitable epoxides include commercial mixtures of C 14 . 16 or C 14 - 18 or C 16 -i8 epoxides, which can be purchased from Elf- Atochem or Union Carbide and which can be prepared from the corresponding olefins by known methods. Purified epoxy compounds such as 1,2-epoxyhexadecane can be purchased from Aldrich Chemicals. The borated compounds are prepared by blending the boron compound and the epoxide and heating them at a suitable temperature, typically 80° to 250°C, until the desired reaction has occurred.
  • An inert liquid such as toluene, xylene, or dimethylformamide can be used as a reaction medium. Water is formed and is typically distilled off during the reaction. Alkaline reagents can be used to catalyze the reaction.
  • a preferred borated epoxide is the borated epoxide of a predominantly 16 carbon olefin. The amount of the borate epoxide can be 0.01 or 0.05 to 0.5 or 1.0 parts by weight of the composition, or alternatively 0. 1 to 0.9 percent.
  • antioxidants may include a mixture of at least two antioxidants, e.g., aromatic amine antioxidants, hindered phenolic antioxidants including ester-containing hindered phenolic antioxidants, and sulfurized olefin antioxidants. These antioxidants may optionally be present in amounts of 0.01 to 5, or 0.15 to 4.5 or 0.2 to 4, or 0.2 to 2 percent by weight.
  • the lubricating composition of the invention includes an aryl amine antioxidant.
  • the aryl amine antioxidant may be a phenyl-a-naphthyla- mine (PANA) or a hydrocarbyl substituted diphenylamine, or mixtures thereof.
  • the hydrocarbyl substituted diphenylamine may include mono- or di- C 4 to C 16 -, or C 6 to Co-, or C9- alkyl diphenylamine.
  • the hydrocarbyl substituted diphenylamine may be octyl diphenylamine, or di-octyl diphenylamine, dinonyl diphenylamine, typically dinonyl diphenylamine.
  • the aryl amine antioxidant may be present at 0.2 wt % to 1.2 wt %, or 0.3 wt % to 1.0 wt %, or 0.4 wt % to 0.9 wt % or 0.5 wt % to 0.8 wt %, of the lubricating composition.
  • the hindered phenol antioxidant often contains a secondary butyl and/or a tertiary butyl group as a sterically hindering group.
  • the phenol group is often further substituted with a hydrocarbyl group and/or a bridging group linking to a second aromatic group.
  • Suitable hindered phenol antioxidants include 2,6-di- tert-butylphenol, 4-methyl-2,6-di-tert-butylphenol, 4-ethyl-2,6-di-tert-butylphenol, 4-propyl-2,6-di-tert-butylphenol or 4-butyl-2,6-di-tert-butylphenol, or 4-dodecyl- 2, 6-di -tert-butylphenol.
  • the hindered phenol antioxidant may be an ester and may include, e.g., IrganoxTM L-135 from Ciba, or butyl 3-(3,5-di-tert- butyl-4-hydroxyphenyl)propanoate.
  • the hindered phenol antioxidant may be present at 0.1 wt % to 1 wt %, or 0.2 wt % to 0.9 wt % or 0.1 wt % to 0.4 wt %, or 0.4 wt % to 1.0 wt %, of the lubricating composition.
  • Antioxidants also include sulfurized olefins such as mono-, or disulfides or mixtures thereof. These materials generally have sulfide linkages having 1 to 10 sulfur atoms, for instance, 1 to 4, or 1 or 2.
  • Materials which can be sulfurized to employ as sulfurized antioxidants in the lubricant composition can include oils, fatty acids and esters, olefins and polyolefins made thereof, terpenes, or Diels-Alder ad- ducts. Details of methods of preparing some such sulfurized materials can be found in U.S. Pat. Nos. 3,471 ,404 and 4, 191,659.
  • the lubricating composition may also include a calcium-containing deter- gent. While the calcium-containing detergent is preferably not present, it can be included in an amount to deliver up to 300 ppm of calcium to the composition, or from 30 ppm to 300 ppm, or 30 ppm to 275 ppm of calcium, or from 60 ppm to 250 ppm, or even from 60 ppm to 225 ppm of calcium.
  • the calcium-containing detergent may be present at 900 ppm or less, or from 1 to 900 ppm, or even from 5 to 800 ppm or 10 to 700 ppm, or even from 15 to 600 or 500 ppm.
  • the calcium-containing detergent may be an overbased detergent, a non- overbased detergent, or mixtures thereof. Typically, the detergent is overbased.
  • Patents describing the preparation of overbased calcium-containing detergents include U.S. patents 2,501,73 1 ; 2,616,905; 2,616,91 1 ; 2,616,925; 2,777,874; 3,256, 186; 3,384,585; 3,365,396; 3,320, 162; 3,3 18,809; 3,488,284; and 3,629, 109.
  • the calcium-containing detergent may be a non-overbased detergent (may also be referred to as a neutral detergent).
  • the TBN of a non-overbased may be 20 to less than 200, or 30 to 100, or 35 to 50 mg KOH/g.
  • the TBN of a non-overbased calcium-containing detergent may also be 20 to 175, or 30 to 100 mg KOH/g.
  • the TBN may be lower (for example 0 to 50 mg KOH/g, or 10 to 20 mg KOH/g).
  • TBN values quoted and associated range of TBN is on "an as is basis,” i.e., containing conventional amounts of diluent oil.
  • Conventional amounts of diluent oil typically range from 30 wt % to 60 wt % (often 40 wt % to 55 wt %) of the detergent component.
  • the calcium-containing detergent may be an overbased detergent, having, for example, a TBN of greater than 200 mg KOH/g (typically 250 to 600, or 300 to 500 mg KOH/g).
  • the overbased calcium-containing detergent may be formed by the reaction of a basic calcium compound and an acidic detergent substrate.
  • the acidic detergent substrate may include an alkyl aromatic sulphonic acid (such as, alkyl naphthalene sulphonic acid, alkyl toluene sulphonic acid or alkyl benzene sulphonic acid), an alkyl sali- cylic acid, or mixtures thereof.
  • the basic calcium compound is used to supply basicity to the detergent.
  • the basic calcium compound is a compound of a hydroxide or oxide of the calcium.
  • the oxides and/or hydroxides may be used alone or in combination.
  • the oxides or hydroxides may be hydrated or dehydrated, although hydrated is typical.
  • the basic calcium compound may be calcium hydroxide, which may be used alone or mixtures thereof with other metal basic compounds. Calcium hydroxide is often referred to as lime.
  • the calcium basic compound may be calcium oxide which may be used alone or mixtures thereof with other metal basic compounds.
  • the calcium-containing detergent may be a sulphonate, or mixtures thereof.
  • the sulphonate may be prepared from a mono- or di- hydro- carbyl-substituted benzene (or naphthalene, indenyl, indanyl, or bicyclopentadienyl) sulphonic acid, wherein the hydrocarbyl group may contain 6 to 40, or 8 to 35 or 9 to 30 carbon atoms.
  • the hydrocarbyl group may be derived from polypropylene or a linear or branched alkyl group containing at least 10 carbon atoms.
  • a suitable alkyl group include branched and/or linear decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, octadecenyl, nonodecyl, eicosyl, un-eicosyl, do-eicosyl, tri-eicosyl, tetra-eicosyl, penta-eicosyl, hexa-eicosyl or mixtures thereof.
  • the hydrocarbyl-substituted sulphonic acid may include polypropene benzenesulphonic acid and/or C 16-C24 alkyl benzenesulphonic acid, or mixtures thereof.
  • a calcium sulphonate detergent may be a predominantly linear alkylbenzene sulphonate detergent having a metal ratio of at least 8 as is described in paragraphs [0026] to [0037] of US Patent Application 2005065045 (and granted as US 7,407,919).
  • the linear alkyl group may be attached to the benzene ring anywhere along the linear chain of the alkyl group, but often in the 2, 3 or 4 position of the linear chain, and in some instances predominantly in the 2 position.
  • a calcium sulphonate detergent may have TBN of less than 100, or less than 75, typically 20 to 50 mg KOH/g, or 0 to 20 mg KOH/g.
  • a calcium sulphonate detergent may have a TBN greater than 200, or 300 to 550, or 350 to 450 mg KOH/g.
  • Phenate detergents are typically derived from p-hydrocarbyl phenols or, generally, alkylphenols. Alkylphenols of this type may be coupled with sulfur and overbased, coupled with aldehyde and overbased, or carboxylated to form salicylate detergents. Suitable alkyl salicylates include those alkylated with oligomers of propylene, oligomers of butene, especially tetramers and pentamers of n-butenes, as well as those alkylated with alpha-olefins, isomerized alpha-olefins, and polyolefins like polyisobutylene.
  • the lubricating composition comprises less than 0.2 wt %, or less than 0.1 wt %, or even less than 0.05 wt % of a salicylate detergent derived from PDDP.
  • the lubricant composition comprises a salicylate detergent that is not derived from PDDP.
  • the lubricating composition comprises a salicylate detergent prepared from PDDP, such detergent contains less than 1.0 weight percent unreacted PDDP, or less than 0.5 weight percent unreacted PDDP, or is substantially free of PDDP.
  • the detergent may be borated or non-borated.
  • the calcium-containing detergent may be an overbased calcium sulphonate, an overbased calcium salicylate, or mixtures thereof.
  • the detergent may be an overbased calcium sulphonate.
  • the calcium-containing detergent may be in a mixture with a zinc-, barium-, sodium-, or magnesium- containing detergent.
  • the zinc-, barium-, sodium-, or magnesium- containing detergent is also well known in the art and described in the same references describing a calcium-containing detergent.
  • the TBN and metal ratios may however, differ slightly.
  • the zinc-, barium-, sodium-, or magnesium- containing detergent may be a phenate, a sulphur-containing phenate, sulphonate, salixarate or salicylate.
  • a zinc-, barium-, sodium-, or magne- sium- containing detergent may be a magnesium phenate, a magnesium sulphur-containing phenate, or a magnesium sulphonate.
  • Dispersants can include, for example, "succinimide dispersants,” a species of carbox- ylic dispersants prepared by the reaction of a hydrocarbyl-substituted succinic an- hydride or reactive equivalent thereof with an amine such as a poly(ethyleneamine); “amine dispersants,” which are reaction products of relatively high molecular weight aliphatic or alicyclic halides and amines, such as polyalkylene polyamines; “Mannich dispersants,” i.e., the reaction products of alkyl phenols in which the al- kyl group contains at least 30 carbon atoms with aldehydes (especially formalde- hyde) and amines (especially polyalkylene polyamines); and “ester dispersants,” similar to the above-described succinimide dispersants except that they may be seen as having been prepared by reaction of a hydrocarbyl acylating agent and
  • Post-treated dispersants may also be used.
  • Post-treated dis- persants are generally obtained by reacting a carboxylic (e.g., succinimide), amine or Mannich dispersant with reagents such as urea, thiourea, carbon disulfide, aldehydes, ketones, carboxylic acids, hydrocarbon-substituted succinic anhydrides, ni- triles, epoxides, boron compounds such as boric acid (to give "borated dispersants” as noted above), phosphorus compounds such as phosphorus acids or anhydrides, 2,5-dimercaptothiadiazole (DMTD), or an aromatic diacid having acid groups in 1,3 or 1,4 positions on a benzene ring (such as terepthahlic acid).
  • a carboxylic e.g., succinimide
  • amine or Mannich dispersant reagents such as urea, thiourea, carbon disulf
  • the dispersant can have a nitrogen content of greater than or equal to about 1 1,000 ppm by weight of the dispersant, or greater than or equal to about 1 l ,500ppm or greater than or equal to about 12,000 ppm.
  • the total amount of dispersant or dispersants, whether post-treated or not (e.g., borated or non-borated, but preferably borated) or combinations thereof, in the compositions may be, for instance, 0.01 to 1.8 percent by weight, or, for example, 0.025 to 1.5 percent or 0.05 to 1.25 weight percent of the final blended fluid formulation, although in a concentrate, the amounts will be proportionately higher.
  • the dispersant may provide less then 100 ppm boron, or less than 90 ppm boron, or even less than 80 ppm boron to the com- position, and in some instances less than 70 ppm boron to the composition.
  • the lubricant composition preferably exhibits an electrical conductivity of up to 7.0xl 0- 10 S/cm as measured by ASTM D2624, or from 6.5x1 ⁇ -10 S/cm, or ⁇ . ⁇ "10 S/cm or 5.5xl 0 "10 S/cm or 5.0xl 0 "10 S/cm conductivity at 100°C and 500 V. It is highly preferably that the lubricant composition has no conductivity, but practically speaking conductivities on the order of 4.0xl0 "10 or 4.5xl0 "10 at 100°C may be achievable.
  • the lubricant composition is substantially free of friction modifiers. In some embodiments, the lubricant composition is completely free of friction modifiers.
  • the lubricant composition will be suitable for lubricating transmissions.
  • the lubricant composition will be suitable for lubricating a transmission in a vehicle with an electric motor, which may be a full electric vehicle or a hybrid- electric vehicle having both an electric motor and an engine powered by hydrocarbon or other fuels.
  • the lubricant composition for such use in transmissions preferably has a kinematic viscosity at 40°C of from 8 cSt to 18 cSt, or for example, from 8 cSt to 16 cSt, or even 8 cSt to 15 cSt, or from 9 cSt to 15 or 16 cSt, or, for example, from 8 cSt to 12.5 or 13 cSt, or even from 9 cSt to 12.5 or 13 cSt, or from 10 cSt to 12 cSt.
  • One aspect is therefore a method of lubricating a transmission, and particularly a transmission in a vehicle with an electric motor, comprising supplying to the trans- mission a lubricant composition as disclosed herein, and operating the transmission.
  • the transmissions in which the lubricant composition may be suitable include automatic transmissions and dual clutch transmissions.
  • the transmission may or may not include a shifting clutch, and, where the transmission includes a shifting clutch, the clutch may be a dry clutch or a wet clutch.
  • the lubricant may be used on a transmission that does not contain a shifting clutch.
  • the lubricant composition may be employed in a transmission having a wet clutch.
  • the lubricant composition may be employed on a transmission having a dry clutch.
  • condensation product is intended to encompass esters, amides, imides and other such materials that may be prepared by a condensation reaction of an acid or a reactive equivalent of an acid (e.g., an acid halide, anhydride, or ester) with an alcohol or amine, irrespective of whether a condensation reaction is actually performed to lead directly to the product.
  • an acid e.g., an acid halide, anhydride, or ester
  • an alcohol or amine irrespective of whether a condensation reaction is actually performed to lead directly to the product.
  • a particular ester may be prepared by a transesterification reaction rather than directly by a condensation reaction.
  • the resulting product is still considered a condensation product.
  • each chemical component described is presented exclusive of any solvent or diluent oil, which may be customarily present in the commercial material, that is, on an active chemical basis, unless otherwise indicated.
  • each chemical or composition referred to herein should be interpreted as being a commercial grade material which may contain the isomers, by-products, derivatives, and other such materials which are normally understood to be present in the commercial grade.
  • 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.
  • hydro- carbyl 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); [00140] 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 and encompass substituents as pyridyl, furyl, thienyl and imidazolyl.
  • Heteroatoms include sulfur, oxygen, and nitrogen.
  • no more than two, or no more than one, non-hydrocarbon substitu- ent will be present for every ten carbon atoms in the hydrocarbyl group; alternatively, there may be no non-hydrocarbon substituents in the hydrocarbyl group.
  • the term "about” means that a value of a given quantity is within ⁇ 20% of the stated value. In other embodiments, the value is within ⁇ 15% of the stated value. In other embodiments, the value is within ⁇ 10% of the stated value. In other embodiments, the value is within ⁇ 5% of the stated value. In other embodiments, the value is within ⁇ 2.5% of the stated value. In other embodiments, the value is within ⁇ 1% of the stated value.
  • the term "substantially” means that a value of a given quantity is within ⁇ 10% of the stated value. In other embodiments, the value is within ⁇ 5% of the stated value. In other embodiments, the value is within ⁇ 2.5%) of the stated value. In other embodiments, the value is within ⁇ 1% of the stated value. [00145]
  • the invention herein is useful for lubricating an automatic transmission for a hybrid electric vehicle, which may be better understood with reference to the following examples.
  • the conductivity of the samples was measured using a Tettex 2830/2831 oil dielectric analyzer outfitted with a test cell for liquid insulating materials (Tettex 2903) with a 2 mm electrode spacing. 40 ml of each sample was transferred into the test cell. Dissipation factor and dielectric constant (permittivity) were recorded at 100°C ⁇ 2°C and 600 V AC applied. The frequency was held constant at 50 Hz. Resistivity measurements were a lso made at this temperature at +500 V DC with a 3 minute shorting time and 1 minute electrification time. Conductivity was calculated from the final resistivity value recorded.
  • the samples were also tested for pitting according to an 80 hour FZG pitting test.
  • This test uses 1500 grams of oil sample and an FZG pitting rig where the speed is set at 1,500 RPM (8.65 m/s) with an arm length of 0.5% at 120°C sump temperature.
  • the test initially starts in load stage 7 for 8 hours and then is inspected for any wear issues. If there are no wear issues, the test is then restarted at a load stage 8 and run using the same speed and temperature for another 8 hours. After re-inspecting the gear from the second 8 hour run for any wear issues, the sample is run for an additional 64 hours at a load stage 9 with the same 1,500 RPM speed at 120°C.
  • each tooth on the pinion gear is inspected for the number and size (in millimeters) of micro pits using a measuring gauge. The area in millimeters of the highest micropitted tooth as well as the total of all micropits from all teeth is reported. Lower levels of pitting are preferred.
  • the transitional term "comprising,” which is synonymous with “including,” “containing,” or “characterized by,” is inclusive or open-ended and does not exclude additional, un-recited elements or method steps.
  • the term also encompass, as alternative embodiments, the phrases “consisting essentially of and “consisting of,” where “consisting of excludes any element or step not specified and “consisting essentially of permits the inclusion of additional un-recited elements or steps that do not materi- ally affect the essential or basic and novel characteristics of the composition or method under consideration.

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Abstract

La technologie de l'invention concerne une composition lubrifiante destinée à être utilisée dans une transmission automatique d'un véhicule électrique hybride, contenant une huile de viscosité lubrifiante, au moins un ester de borate et au moins un composé contenant du phosphore.
PCT/US2018/046187 2017-08-16 2018-08-10 Composition lubrifiante pour une transmission de véhicule électrique hybride WO2019036285A1 (fr)

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JP2020508496A JP7204738B2 (ja) 2017-08-16 2018-08-10 ハイブリッド電気自動車変速機用の潤滑組成物
CA3072337A CA3072337A1 (fr) 2017-08-16 2018-08-10 Composition lubrifiante pour une transmission de vehicule electrique hybride
EP18760166.1A EP3668959B1 (fr) 2017-08-16 2018-08-10 Composition lubrifiante pour une transmission de véhicule électrique hybride
US16/637,988 US20200216774A1 (en) 2017-08-16 2018-08-10 Lubricating composition for a hybrid electric vehicle transmission
CN201880059959.9A CN111108182B (zh) 2017-08-16 2018-08-10 用于混合动力电动车辆变速器的润滑组合物
KR1020207006533A KR102669569B1 (ko) 2017-08-16 2018-08-10 하이브리드 전기 차량 변속기용 윤활 조성물

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WO2020260460A1 (fr) * 2019-06-28 2020-12-30 Total Marketing Services Utilisation d'un composé de type amine aromatique ou phénol stériquement encombré à titre d'additif anticorrosion dans une composition lubrifiante destinée à un système de propulsion d'un véhicule électrique ou hybride
US11753599B2 (en) 2021-06-04 2023-09-12 Afton Chemical Corporation Lubricating compositions for a hybrid engine

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FR3109942B1 (fr) * 2020-05-05 2022-08-19 Total Marketing Services Composition lubrifiante pour vehicules electriques
US11332689B2 (en) * 2020-08-07 2022-05-17 Afton Chemical Corporation Phosphorylated dispersants in fluids for electric vehicles
WO2023196116A1 (fr) * 2022-04-06 2023-10-12 The Lubrizol Corporation Procédé pour réduire au minimum les dépôts conducteurs

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