LUBRICANT COMPOSITION COMPRISING UNHINDERED ALKYL AMINES

Abstract

A lubricant composition including a base oil and from 0.01 to 10 wt. % of an amine compound based on a total weight of the lubricant composition. The amine compound has the formula R1(R2)NH, where R1 and R2 are each independently straight or branched chain acyclic alkyl groups having from 1 to 20 carbon atoms. The alpha carbon of R1 or R2 is primary if R1 or R2 is an alkyl group having more than one carbon atom respectively. At least 90 wt. % of the amine compound remains unreacted in the lubricant composition based on a total weight of the amine compound prior to any reaction in the lubricant composition.

Description

RELATED APPLICATIONS

This application claims priority to U.S. Provisional Patent Application No. 61/682,882 filed on Aug. 14, 2012, U.S. Provisional Patent Application No. 61/682,883 filed on Aug. 14, 2012, and U.S. Provisional Patent Application No. 61/682,884 filed on Aug. 14, 2012, each of which is incorporated by reference herein in its entirety.

FIELD OF THE INVENTION

The present invention generally relates to a lubricant composition. More specifically, the invention relates to a lubricant composition comprising an amine compound and to a method of forming the lubricant composition.

BACKGROUND OF THE INVENTION

It is known and customary to add stabilizers to lubricant compositions based on mineral or synthetic oils in order to improve their performance characteristics. Antioxidants are one type of stabilizer of particular importance. Oxidative degradation of lubricant composition plays a significant role especially in motor oils because of the high temperatures prevailing in the combustion chambers of the engines and the presence, in addition to oxygen, of oxides of nitrogen which act as oxidation catalysts.

Some amine compounds are effective stabilizers for lubricants. These amine compounds may help neutralize acids formed during the combustion process. Conventional primary amines were added to a lubricant composition in conjunction with an acid to form an amine salt. Such primary amine salts conveyed useful properties to the lubricant composition. However, such amine salts required the addition of an acid, which adds additional expense to the lubricant composition. Thus, there remains a need for a cost effective additive for a lubricant composition that does not require additional components.

SUMMARY OF THE INVENTION

The present invention provides a lubricant composition comprising a base oil and an amine compound. The amine compound has the formula:

R¹ and R² are each independently straight or branched chain acyclic alkyl groups having from 1 to 20 carbon atoms. The alpha carbon of R¹ or R² is primary if R¹ or R² is an alkyl group having more than one carbon atom respectively. In the lubricant composition, at least 90 wt. % of the amine compound remains unreacted based on a total weight of the amine compound prior to any reaction in the lubricant composition. The present invention is also directed to an additive concentrate comprising the amine compound.

DETAILED DESCRIPTION OF THE INVENTION

One aspect of a lubricant composition is the amount of basic material dispersed/dissolved within it, which is referred to as the Total Base Number (“TBN”) of the lubricant composition. TBN is an industry standard measurement used to correlate the basicity of any material to that of potassium hydroxide. This value is measured by two ASTM titration methods, ASTM D2896 and ASTM D4739. Most TBN has been delivered by use of overbased metal soaps, but these soaps created problems with some newer engine technologies, such as diesel particulate filters. Formulations that minimize use of these metal soaps are of value and are referred to as “Low SAPS oils” (SAPS stands for Sulfated Ash, Phosphorus and Sulfur).

The requirements of the Low SAPS designation restricts the amount of traditional calcium and magnesium based detergents found in the lubricant composition. These traditional detergents had many functions, including neutralization of acids formed during the combustion process and generated from the oxidation of the base oil. However, the limitation on the amount of these traditional calcium and magnesium based detergents that can be included has lowered the capacity of lubricant composition to neutralize acids. The decreased capacity of the lubricant composition to neutralize acids results in the need to replace the lubricant composition more frequently.

The present invention provides a lubricant composition including a base oil and an amine compound. The present invention also provides a method of forming the lubricant composition and a method of lubricating a system with the lubricant composition. The present invention also provides an additive concentrate including the amine compound. The lubricant composition, the additive concentrate, and these methods, are described further below. The amine compound is useful for adjusting the total base number (TBN) of any lubricant composition. Lubricant compositions containing these amine compounds help neutralize acids formed during the combustion process and reduce the expense of adding additional components, such as acid.

As described above, the lubricant composition may include the amine compound in an amount ranging from 0.01 to 10 wt. %. The amine compound has the formula (I):

The alpha carbon of R¹ or R² is primary if R¹ or R² is an alkyl group having more than one carbon atom respectively. Said differently, if both R¹ and R² are alkyl groups having more than one carbon atom, at least one of R¹ and R² is primary. Said differently still, if R¹ is a methyl group and R² is a butyl group, R² is primary.

The term “alpha” refers to a first carbon that attaches to a functional group. For reference purposes only and to further elaborate on the meaning of “alpha,” see formula (II) below:

Formula (II) has two alpha carbons, one bonded to the phenyl functional group and the other bonded to the ketone functional group.

The term “primary” refers to the fact that the appointed carbon is bonded to only one carbon atom. For reference purposes only and to further elaborate on the meaning of “primary” see formula (III) below:

In formula (III), the carbon designated by “P” is primary because it is bonded to a single carbon atom opposite the hydroxyl group.

Referring again to formula (I), in certain embodiments, the alpha carbons of both R¹ and R² are primary if both R¹ and R² are independently alkyl groups having more than one carbon atom. Thus, R¹ can be primary, R² can be primary, or both R¹ and R² can be primary. R¹ and R² are each independently straight or branched chain alkyl groups having from 1 to 20 carbon atoms. Alternatively, R¹ and R² may each be independently straight or branched chain alkyl groups having from 1 to 17, 1 to 14, or 3 to 12, carbon atoms. Exemplary R¹ and R² groups include methyl, ethyl, n-propyl, n-butyl, sec-butyl, tert-butyl, n-hexyl, n-octyl, 2-ethylhexyl, n-nonyl, n-decyl, n-undecyl n-dodecyl, n-tridecyl, n-tetradecyl, n-hexadecyl, and n-octadecyl groups. R¹ and R² are both acyclic, meaning free from any cyclic structures.

In certain embodiments, at least one group designated by R¹ or R² is unsubstituted. By “unsubstituted,” it is intended that the designated group is free from pendant functional groups such as hydroxyl, carboxyl, oxide, thio, and thiol, and that the designated group is free from acyclic heteroatoms, such as oxygen, sulfur, and nitrogen. In other embodiments, both R¹ and R² are unsubstituted. In still yet other embodiments, it is contemplated that R¹ and/or R² may be substituted and include pendant functional groups such as hydroxyl, carboxyl, oxide, thio, or thiol, or may include acyclic heteroatoms, such as oxygen, sulfur, or nitrogen.

In one or more embodiments, the amine compound is non-polymeric. The term “non-polymeric” refers to the fact that the amine compound includes fewer than 50, 40, 30, or 20 repeating monomer units. Furthermore, the amine compound may include only one nitrogen atom.

In one or more embodiments, the amine compound is free of phosphorous. For example, the amine compound is not contained in a salt including phosphorous. It is also contemplated that the amine compound consists of nitrogen, hydrogen, and carbon atoms. More generally, in certain embodiments, the amine compound may not form salts or complexes with other materials present in the lubricant composition.

In one particular embodiment, the amine compound is:

or combinations thereof. Alternatively, the amine compound may include bis(2-ethylhexyl)amine, ditridecylamine, or combinations thereof.

Previous uses of conventional amine compounds involved forming a reaction product of such conventional amine compounds with various acids, oxides, triazoles, and other reactive components. In these applications, the conventional amine compounds are consumed by certain reactions, such that the ultimately formed lubricant composition does not contain significant amounts of the conventional amine compound. In such conventional applications, more than 50 wt. % of the conventional amine compound is typically reacted in the lubricant composition based on the total weight of the conventional amine compound. In contrast, the inventive lubricant compositions and inventive methods contain a significant amount of the amine compound in an unreacted state. In certain embodiments, at least 90 wt. % of the amine compound remains unreacted in the lubricant composition based on a total weight of the amine compound prior to any reaction in the lubricant composition. Alternatively, at least 95, 96, 97, 98, or 99 wt. % of the amine compound remains unreacted in the lubricant composition based on a total weight of the amine compound prior to any reaction in the lubricant composition.

The term “unreacted” refers to the fact that the unreacted portion of the amine compound does not react with any components in the lubricant composition. Accordingly, the unreacted portion of the amine compound remains in its virgin state when present in the lubricant composition before the lubricant composition has been used in an end-user application, such as an internal combustion engine.

The phrase “prior to any reaction in the lubricant composition” refers to the basis of the amount of the amine compound in the lubricant composition. This phrase does not require that the amine compound reacts in the lubricant composition either before or after use in an end-user application.

In one embodiment, the percentage of the amine compound that remains unreacted is determined after all of the components which are present in the lubricant composition reach equilibrium with one another. The time period necessary to reach equilibrium in the lubricant composition may vary widely. For example, the amount of time necessary to reach equilibrium may range from a single minute to many days, or even weeks. In certain embodiments, the percentage of the amine compound that remains unreacted in the lubricant composition is determined after 1 minute, 1 hour, 5 hours, 12 hours, 1 day, 2 days 3 days, 1 week, 1 month, 6 months, or 1 year.

In certain embodiments, the lubricant composition includes less than 0.1, 0.01, 0.001, or 0.0001, wt. %, of compounds which would react with the amine compound based on the total weight of the lubricant composition. In certain embodiments, the lubricant composition may include a collective amount of acids, anhydrides, triazoles, and/or oxides (compounds which would react with the amine compound) which is less than 0.1 wt. % of the total weight of the lubricant composition. The term “acids” may include both traditional acids and Lewis acids. For example, acids include carboxylic acids, such as glycolic acid; lactic acid; hydracylic acid; alkylated succinic acids; alkylaromatic sulfonic acids; and fatty acids. Exemplary Lewis acids include alkyl aluminates; alkyl titanates; molybdenumates, such as molybdenum thiocarbamates and molybdenum carbamates; and molybdenum sulfides. “Anhydrides” are exemplified by alkylated succinic anhydrides and acrylates. Triazoles may be represented by benzotriazoles and derivatives thereof, tolutriazole and derivatives thereof, 2-mercaptobenzothiazole, 2,5-dimercaptothiadiazole, 4,4′-methylene-bis-benzotriazole, 4,5,6,7-tetrahydro-benzotriazole, salicylidenepropylenediamine and salicylamino-guanidine and salts thereof. Oxides may be represented by alkylene oxides, such as ethylene oxide and propylene oxide; metal oxides; alkoxylated alcohols; alkoxylated amines; or alkoxylated esters. Alternatively, the lubricant composition may include a collective amount of acids, anhydrides, triazoles, and oxides which is less than 0.01, 0.001, or 0.0001, wt. %, based on the total weight of the lubricant compositions. Alternatively still, the lubricant composition may be free of acids, anhydrides, triazoles, and oxides.

In yet another embodiment, the lubricant composition may consist, or consist essentially of a base oil and the amine compound. It is also contemplated that the lubricant composition may consist of, or consists essentially of, the base oil and the amine compound in addition to one or more additives that do not compromise the functionality or performance of the amine compound. In various embodiments where the lubricant composition consists essentially of the base oil and the amine compound, the lubricant composition is free of, or includes less than 0.01, 0.001, or 0.0001, wt. %, of acids, anhydrides, triazoles, and oxides based on the total weight of the lubricant composition. In other embodiments, the terminology “consisting essentially of” describes the lubricant composition being free of compounds that materially affect the overall performance of the lubricant composition, e.g., in terms of lubricity, total base number, viscosity, corrosion resistance, or seal compatibility.

The lubricant composition includes the amine compound in an amount ranging from 0.1 to 10 wt. % based on the total weight of the lubricant composition. Alternatively, the lubricant composition may include the amine compound in an amount ranging from 0.5 to 5, or from 1 to 3, wt. %, based on the total weight of the lubricant composition.

Alternatively, if the lubricant composition is formulated as an additive concentrate, the amine compound may be included in the additive concentrate in an amount ranging from 0.5 to 90, 1 to 50, 1 to 30, or 5 to 25 wt. % based on the total weight of the additive concentrate.

As described above, the amine compound improves the TBN of the lubricant composition. The value is reported as mg KOH/g and is measured according to ASTM D4739 for the amine compound itself. The TBN of the amine compound is at least 70, 100 or 150 mg KOH/g of the amine compound.

In one embodiment, the lubricant composition derives at least 5%, at least 10%, at least 20%, at least 40%, at least 60%, at least 80%, or even 100% of the compositional TBN (as measured in accordance with ASTM D4739) from the amine compound. Furthermore, in certain embodiments, the lubricant composition includes an amount of the amine compound that contributes from 0.5 to 15, from 1 to 12, from 0.5 to 4, from 1 to 3, mg KOH/g of TBN (as measured in accordance with ASTM D4739) to the lubricant composition.

The lubricant composition, which includes the amine compound, may have a TBN value of at least 1 mg KOH/g of lubricant composition. Alternatively, the lubricant composition has a TBN value ranging from 1 to 15, 5 to 15, or 9 to 12 mg KOH/g of lubricant composition when tested according to ASTM D2896.

In certain embodiments, the base oil is selected from the group of API Group I base oils, API Group II base oils, API Group III base oils, API Group IV base oils, API Group V base oils, and combinations thereof. In one embodiment, the base oil includes an API Group II base oil.

The base oil is classified in accordance with the American Petroleum Institute (API) Base Oil Interchangeability Guidelines. In other words, the base oil may be further described as one or more of five types of base oils: Group I (sulphur content >0.03 wt. %, and/or <90 wt. % saturates, viscosity index 80-119); Group II (sulphur content less than or equal to 0.03 wt. %, and greater than or equal to 90 wt. % saturates, viscosity index 80-119); Group III (sulphur content less than or equal to 0.03 wt. %, and greater than or equal to 90 wt. % saturates, viscosity index greater than or equal to 119); Group IV (all polyalphaolefins (PAO's)); and Group V (all others not included in Groups I, II, III, or IV).

The base oil typically has a viscosity ranging from 1 to 20 cSt when tested according to ASTM D445 at 100° C. Alternatively, the viscosity of the base oil may range from 3 to 17, or from 5 to 14, cSt when tested according to ASTM D445 at 100° C.

The base oil may be further defined as a crankcase lubrication oil for spark-ignited and compression ignited internal combustion engines, including automobile and truck engines, two-cycle engines, aviation piston engines, and marine and railroad diesel engines. Alternatively, the base oil can be further defined as an oil to be used in gas engines, stationary power engines, and turbines. The base oil may be further defined as heavy or light duty engine oil.

In still other embodiments, the base oil may be further defined as synthetic oil which may include one or more alkylene oxide polymers and interpolymers and derivatives thereof wherein their terminal hydroxyl groups are modified by esterification, etherification, or similar reactions. Typically, these synthetic oils are prepared through polymerization of ethylene oxide or propylene oxide to form polyoxyalkylene polymers which can be further reacted to form the oils. For example, alkyl and aryl ethers of these polyoxyalkylene polymers (e.g., methylpolyisopropylene glycol ether having an average molecular weight of 1,000; diphenyl ether of polyethylene glycol having a molecular weight of 500-1,000; and diethyl ether of polypropylene glycol having a molecular weight of 1,000-1,500) and/or mono- and polycarboxylic esters thereof (e.g. acetic acid esters, mixed C₃-C₈ fatty acid esters, or the C₁₃ oxo acid diester of tetraethylene glycol) may also be utilized as the base oil.

The base oil is typically present in the lubricant composition in an amount ranging from 70 to 99.9, from 80 to 99.9, from 90 to 99.9, from 75 to 95, from 80 to 90, or from 85 to 95, wt. %, based on the total weight of the lubricant composition. Alternatively, the base oil may be present in the lubricant composition in amounts of greater than 70, 75, 80, 85, 90, 91, 92, 93, 94, 95, 96, 97, 98, or 99, wt. %, based on the total weight of the lubricant composition. In various embodiments, the amount of base oil in a fully formulated lubricant composition (including diluents or carrier oils presents) is from 80 to 99.5, from 85 to 96, or from 90 to 95, wt. %, based on the total weight of the lubricant composition. In one or more embodiments, the lubricant composition may be classified as a low SAPS lubricant having a sulfated ash content of no more than 3, 2, 1, or 0.5, wt. %, based on the total weight of the lubricant composition.

Alternatively, in embodiments where the lubricant composition is formulated as the additive concentrate, the base oil may be present in the additive concentrate in an amount ranging from 0.1 to 50, from 1 to 25, or from 1 to 15, wt. %, based on the total weight of the additive concentrate.

The lubricant composition may additionally include one or more additives to improve various chemical and/or physical properties of the lubricant composition. Specific examples of the one or more additives include anti-wear additives, antioxidants, metal deactivators (or passivators), rust inhibitors, viscosity index improvers, pour point depressors, dispersants, detergents, and antifriction additives. Each of the additives may be used alone or in combination. The additive(s) can be used in various amounts, if employed. The lubricant composition may be formulated with the additional of several auxiliary components to achieve certain performance objectives for use in certain applications. For example, the lubricant composition may be a rust and oxidation lubricant formulation, a hydraulic lubricant formulation, turbine lubricant oil, and an internal combustion engine lubricant formulation. Accordingly, it is contemplated that the base oil may be formulated to achieve these objectives as discussed below.

If employed, the anti-wear additive can be of various types. In one embodiment, the anti-wear additive is a dihydrocarbyl-dithio phosphate salt, such as a zinc dialkyldithiophosphate. The dihydrocarbyl dithiophosphate salt may be represented by the following general formula: [R³O(R⁴O)PS(S)]₂M, wherein R³ and R⁴ are each independently hydrocarbyl groups having from 1 to 20 carbon atoms, and wherein M is a metal atom or an ammonium group. For example, R³ and R⁴ are each independently C_1-20 alkyl groups, C_2-20 alkenyl groups, C_3-20 cycloalkyl groups, C_1-20 aralkyl groups or C_3-20 aryl groups. The metal atom is selected from the group including aluminum, lead, tin, manganese, cobalt, nickel, or zinc. The ammonium group may be derived from ammonia or a primary, secondary, or tertiary amine. The ammonium group may be of the formula R⁵R⁶R⁷R⁸N⁺, wherein R⁵, R⁶, R⁷, and R⁸ each independently designates a hydrogen atom or a hydrocarbyl group having from 1 to 150 carbon atoms. In certain embodiments, R⁵, R⁶, R⁷, and R⁸ may each independently designate hydrocarbyl groups having from 4 to 30 carbon atoms.

Alternatively, the anti-wear additive may include sulfur, phosphorus, and/or halogen containing compounds, e.g., sulfurised olefins and vegetable oils, alkylated triphenyl phosphates, tritolyl phosphate, tricresyl phosphate, chlorinated paraffins, alkyl and aryl di- and trisulfides, amine salts of mono- and dialkyl phosphates, amine salts of methylphosphonic acid, diethanolaminomethyltolyltriazole, bis(2-ethylhexyl)aminomethyltolyltriazole, derivatives of 2,5-dimercapto-1,3,4-thiadiazole, ethyl 3-[(diisopropoxyphosphinothioyl)thio]propionate, triphenyl thiophosphate (triphenylphosphorothioate), tris(alkylphenyl) phosphorothioate and mixtures thereof (for example tris(isononylphenyl) phosphorothioate), diphenyl monononylphenyl phosphorothioate, isobutylphenyl diphenyl phosphorothioate, the dodecylamine salt of 3-hydroxy-1,3-thiaphosphetane 3-oxide, trithiophosphoric acid 5,5,5-tris[isooctyl 2-acetate], derivatives of 2-mercaptobenzothiazole such as 1-[N,N-bis(2-ethylhexyl)aminomethyl]-2-mercapto-1H-1,3-benzothiazole, ethoxycarbonyl-5-octyldithio carbamate, and/or combinations thereof.

If employed, the anti-wear additive can be used in various amounts. The anti-wear additive is typically present in the lubricant composition in an amount ranging from 0.1 to 20, 0.5 to 15, 1 to 10, 0.1 to 1, 0.1 to 0.5, or 0.1 to 1.5, wt. %, each based on the total weight of the lubricant composition. Alternatively, the anti-wear additive may be present in amounts of less than 20, less than 10, less than 5, less than 1, less than 0.5, or less than 0.1, wt. %, each based on the total weight of the lubricant composition. Alternatively still, the additive concentrate may include the anti-wear additive in an amount ranging from 1 to 99.9, from 5 to 50, or from 10 to 40, wt. %, each based on the total weight of the additive concentrate. Alternatively, the additive concentrate may include the anti-wear additive in amounts of less than 20, less than 10, less than 5, less than 1, less than 0.5, or less than 0.1, wt. %, each based on the total weight of the additive concentrate.

If employed, the antioxidant can be of various types. Suitable antioxidants include alkylated monophenols, for example 2,6-di-tert-butyl-4-methylphenol, 2-tert-butyl-4,6-dimethylphenol, 2,6-di-tert-butyl-4-ethylphenol, 2,6-di-tert-butyl-4-n-butylphenol, 2,6-di-tert-butyl-4-isobutylphenol, 2,6-dicyclopentyl-4-methylphenol, 2-(α-methylcyclohexyl)-4,6-dimethylphenol, 2,6-dioctadecyl-4-methylphenol, 2,4,6-tricyclohexylphenol, 2,6-di-tert-butyl-4-methoxymethylphenol, 2,6-di-nonyl-4-methylphenol, 2,4-dimethyl-6(1′-methylundec-1′-yl)phenol, 2,4-dimethyl-6-(1′-methylheptadec-1′-yl)phenol, 2,4-dimethyl-6-(1′-methyltridec-1′-yl)phenol, and combinations thereof.

Further examples of suitable antioxidants includes alkylthiomethylphenols, for example 2,4-dioctylthiomethyl-6-tert-butylphenol, 2,4-dioctylthiomethyl-6-methylphenol, 2,4-dioctylthiomethyl-6-ethylphenol, 2,6-didodecylthiomethyl-4-nonylphenol, and combinations thereof. Hydroquinones and alkylated hydroquinones, for example 2,6-di-tert-butyl-4-methoxyphenol, 2,5-di-tert-butylhydroquinone, 2,5-di-tert-amylhydroquinone, 2,6-diphenyl-4-octadecyloxyphenol, 2,6-di-tert-butylhydroquinone, 2,5-di-tert-butyl-4-hydroxyanisole, 3,5-di-tert-butyl-4-hydroxyanisole, 3,5-di-tert-butyl-4-hydroxyphenyl stearate, bis-(3,5-di-tert-butyl-4-hydroxyphenyl) adipate, and combinations thereof, may also be utilized.

Furthermore, hydroxylated thiodiphenyl ethers, for example 2,2′-thiobis(6-tert-butyl-4-methylphenol), 2,2′-thiobis(4-octylphenol), 4,4′-thiobis(6-tert-butyl-3-methylphenol), 4,4′-thiobis(6-tert-butyl-2-methylphenol), 4,4′-thiobis-(3,6-di-sec-amylphenol), 4,4′-bis-(2,6-dimethyl-4-hydroxyphenyl)disulfide, and combinations thereof, may also be used.

It is also contemplated that alkylidenebisphenols, for example 2,2′-methylenebis(6-tert-butyl-4-methylphenol), 2,2′-methylenebis(6-tert-butyl-4-ethylphenol), 2,2′-methylenebis[4-methyl-6-(α-methylcyclohexyl)phenol], 2,2′-methylenebis(4-methyl-6-cyclohexylphenol), 2,2′-methylenebis(6-nonyl-4-methylphenol), 2,2′-methylenebis(4,6-di-tert-butylphenol), 2,2′-ethylidenebis(4,6-di-tert-butylphenol), 2,2′-ethylidenebis(6-tert-butyl-4-isobutylphenol), 2,2′-methylenebis[6-(α-methylbenzyl)-4-nonylphenol], 2,2′-methylenebis[6-(cc, α-dimethylbenzyl)-4-nonylphenol], 4,4′-methylenebis(2,6-di-tert-butylphenol), 4,4′-methylenebis(6-tert-butyl-2-methylphenol), 1,1-bis(5-tert-butyl-4-hydroxy-2-methylphenyl)butane, 2,6-bis(3-tert-butyl-5-methyl-2-hydroxybenzyl)-4-methylphenol, 1,1,3-tris(5-tert-butyl-4-hydroxy-2-methylphenyl)butane, 1,1-bis(5-tert-butyl-4-hydroxy-2-methyl-phenyl)-3-n-dodecylmercapto butane, ethylene glycol bis[3,3-bis(3′-tert-butyl-4′-hydroxyphenyl)butyrate], bis(3-tert-butyl-4-hydroxy-5-methyl-phenyl)dicyclopentadiene, bis[2-(3′-tert-butyl-2′-hydroxy-5′-methylbenzyl)-6-tert-butyl-4-methylphenyl]terephthalate, 1,1-bis-(3,5-dimethyl-2-hydroxyphenyl)butane, 2,2-bis-(3,5-di-tert-butyl-4-hydroxyphenyl)propane, 2,2-bis-(5-tert-butyl-4-hydroxy-2-methylphenyl)-4-n-dodecylmercaptobutane, 1,1,5,5-tetra-(5-tert-butyl-4-hydroxy-2-methyl phenyl)pentane, and combinations thereof may be utilized as antioxidants in the lubricant composition.

O-, N- and S-benzyl compounds, for example 3,5,3′,5′-tetra-tert-butyl-4,4′-dihydroxydibenzyl ether, octadecyl-4-hydroxy-3,5-dimethylbenzylmercaptoacetate, tris-(3,5-di-tert-butyl-4-hydroxybenzyl)amine, bis(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)dithiol terephthalate, bis(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, isooctyl-3,5di-tert-butyl-4-hydroxy benzylmercaptoacetate, and combinations thereof, may also be utilized.

Hydroxybenzylated malonates, for example dioctadecyl-2,2-bis-(3,5-di-tert-butyl-2-hydroxybenzyl)-malonate, di-octadecyl-2-(3-tert-butyl-4-hydroxy-5-methylbenzyl)-malonate, di-dodecylmercaptoethyl-2,2-bis-(3,5-di-tert-butyl-4-hydroxybenzyl)malonate, bis[4-(1,1,3,3-tetramethylbutyl)phenyl]-2,2-bis(3,5-di-tert-butyl-4-hydroxybenzyl)malonate, and combinations thereof are also suitable for use as antioxidants.

Triazine compounds, for example 2,4-bis(octylmercapto)-6-(3,5-di-tert-butyl-4-hydroxyanilino)-1,3,5-triazine, 2-octylmercapto-4,6-bis(3,5-di-tert-butyl-4-hydroxyanilino)-1,3,5-triazine, 2-octylmercapto-4,6-bis(3,5-di-tert-butyl-4-hydroxyphenoxy)-1,3,5-triazine, 2,4,6-tris(3,5-di-tert-butyl-4-hydroxyphenoxy)-1,2,3-triazine, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate, 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl 2,4,6-tris(3,5-di-tert-butyl-4-hydroxyphenylethyl)-1,3,5-triazine, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxyphenyl propionyl)-hexahydro-1,3,5-triazine, 1,3,5-tris-(3,5-dicyclohexyl-4-hydroxybenzyl)-isocyanurate, and combinations thereof, may also be used.

Additional examples of antioxidants include aromatic hydroxybenzyl compounds, for example 1,3,5-tris-(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene, 1,4-bis(3,5-di-tert-butyl-4-hydroxybenzyl)-2,3,5,6-tetramethylbenzene, 2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)phenol, and combinations thereof. Benzylphosphonates, for example dimethyl-2,5-di-tert-butyl-4-hydroxybenzylphosphonate, diethyl-3,5-di-tert-butyl-4-hydroxybenzylphosphonate, dioctadecyl3,5-di-tert-butyl-4-hydroxybenzylphosphonate, dioctadecyl-5-tert-butyl-4-hydroxy-3-methylbenzylphosphonate, the calcium salt of the monoethyl ester of 3,5-di-tert-butyl-4-hydroxybenzylphosphonic acid, and combinations thereof, may also be utilized. In addition, acylaminophenols, for example 4-hydroxylauranilide, 4-hydroxystearanilide, octyl N-(3,5-di-tert-butyl-4-hydroxyphenyl)carbamate.

Esters of [3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid with mono- or polyhydric alcohols, e.g. with methanol, ethanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol, 1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris(hydroxyethyl) isocyanurate, N,N′-bis(hydroxyethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo[2.2.2]octane, and combinations thereof, may also be used. It is further contemplated that esters of β-(5-tert-butyl-4-hydroxy-3-methylphenyl)-propionic acid with mono- or polyhydric alcohols, e.g. with methanol, ethanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol, 1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris(hydroxyethyl) isocyanurate, N,N′-bis(hydroxyethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo[2.2.2]octane, and combinations thereof, may be used.

Additional examples of suitable antioxidants include those that include nitrogen, such as amides of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid, e.g., N,N′-bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)hexamethylenediamine, N,N′-bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)trimethylenediamine, N,N′-bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)hydrazine. Other suitable examples of antioxidants include aminic antioxidants such as N,N′-diisopropyl-p-phenylenediamine, N,N′-di-sec-butyl-p-phenylenediamine, N,N′-bis(1,4-dimethylpentyl)-p-phenylenediamine, N,N′-bis(1-ethyl-3-methylpentyl)-p-phenylenediamine, N,N′-bis(1-methylheptyl)-p-phenylenediamine, N,N′-dicyclohexyl-p-phenylenediamine, N,N′-diphenyl-p-phenylenediamine, N,N′-bis(2-naphthyl)-p-phenylenediamine, N-isopropyl-N′-phenyl-p-phenylenediamine, N-(1,3-dimethyl-butyl)-N′-phenyl-p-phenylenediamine, N-(1-methylheptyl)-N′-phenyl-p-phenylenediamine, N-cyclohexyl-N′-phenyl-p-phenylenediamine, 4-(p-toluenesulfamoyl)diphenylamine, N,N′-dimethyl-N,N′-di-sec-butyl-p-phenylenediamine, diphenylamine, N-allyldiphenylamine, 4-isopropoxydiphenylamine, N-phenyl-1-naphthylamine, N-phenyl-2-naphthylamine, octylated diphenylamine, for example p,p′-di-tert-octyldiphenylamine, 4-n-butylaminophenol, 4-butyrylaminophenol, 4-nonanoylaminophenol, 4-dodecanoylaminophenol, 4-octadecanoylaminophenol, bis(4-methoxyphenyl)amine, 2,6-di-tert-butyl-4-dimethylamino methylphenol, 2,4′-diaminodiphenylmethane, 4,4′-diaminodiphenylmethane, N,N,N′,N′-tetramethyl-4,4′-diaminodiphenylmethane, 1,2-bis[(2-methyl-phenyl)amino]ethane, 1,2-bis(phenylamino)propane, (o-tolyl)biguanide, bis[4-(1′,3′-dimethylbutyl)phenyl]amine, tert-octylated N-phenyl-1-naphthylamine, a mixture of mono- and dialkylated tert-butyl/tert-octyldiphenylamines, a mixture of mono- and dialkylated isopropyl/isohexyldiphenylamines, mixtures of mono- and dialkylated tert-butyldiphenylamines, 2,3-dihydro-3,3-dimethyl-4H-1,4-benzothiazine, phenothiazine, N-allylphenothiazine, N,N,N′,N′-tetraphenyl-1,4-diaminobut-2-ene, N,N-bis(2,2,6,6-tetramethylpiperid-4-yl-hexamethylenediamine, bis(2,2,6,6-tetramethyl piperid-4-yl)sebacate, 2,2,6,6-tetramethylpiperidin-4-one and 2,2,6,6-tetramethyl piperidin-4-ol, and combinations thereof.

Even further examples of suitable antioxidants include aliphatic or aromatic phosphites, esters of thiodipropionic acid or of thiodiacetic acid, or salts of dithiocarbamic or dithiophosphoric acid, 2,2,12,12-tetramethyl-5,9-dihydroxy-3,7,1-trithiamidecane and 2,2,15,15-tetramethyl-5,12-dihydroxy-3,7,10,14-tetrathiahexadecane, and combinations thereof. Furthermore, sulfurized fatty esters, sulfurized fats and sulfurized olefins, and combinations thereof, may be used.

If employed, the antioxidant can be used in various amounts. The antioxidant is typically present in the lubricant composition in an amount ranging from 0.01 to 5, 0.1 to 3, or 0.5 to 2, wt. %, based on the total weight of the lubricant composition. Alternatively, the antioxidant may be present in amounts of less than 5, less than 3, or less than 2, wt. %, based on the total weight of the lubricant composition. The antioxidant may be present in the additive concentrate in an amount ranging from 0.1 to 99, from 1 to 70, from 5 to 50, or from 25 to 50, wt. %, based on the total weight of the additive concentrate.

If employed, the metal deactivator can be of various types. Suitable metal deactivators include benzotriazoles and derivatives thereof, for example 4- or 5-alkylbenzotriazoles (e.g. tolutriazole) and derivatives thereof, 4,5,6,7-tetrahydrobenzotriazole and 5,5′-methylenebisbenzotriazole; Mannich bases of benzotriazole or tolutriazole, e.g. 1-[bis(2-ethylhexyl)aminomethyl)tolutriazole and 1-[bis(2-ethylhexyl)aminomethyl)benzotriazole; and alkoxyalkylbenzotriazoles such as 1-(nonyloxymethyl)benzotriazole, 1-(1-butoxyethyl)benzotriazole and 1-(1-cyclohexyloxybutyl) tolutriazole, and combinations thereof.

Additional examples of suitable metal deactivators include 1,2,4-triazoles and derivatives thereof, for example 3-alkyl(or aryl)-1,2,4-triazoles, and Mannich bases of 1,2,4-triazoles, such as 1-[bis(2-ethylhexyl)aminomethyl-1,2,4-triazole; alkoxyalkyl-1,2,4-triazoles such as 1-(1-butoxyethyl)-1,2,4-triazole; and acylated 3-amino-1,2,4-triazoles, imidazole derivatives, for example 4,4′-methylenebis(2-undecyl-5-methylimidazole) and bis[(N-methyl)imidazol-2-yl]carbinol octyl ether, and combinations thereof. Further examples of suitable metal deactivators include sulfur-containing heterocyclic compounds, for example 2-mercaptobenzothiazole, 2,5-dimercapto-1,3,4-thiadiazole and derivatives thereof; and 3,5-bis[di(2-ethylhexyl)aminomethyl]-1,3,4-thiadiazolin-2-one, and combinations thereof. Even further examples of metal deactivators include amino compounds, for example salicylidenepropylenediamine, salicylaminoguanidine and salts thereof, and combinations thereof.

If employed, the metal deactivator can be used in various amounts. The metal deactivator is typically present in the lubricant composition in an amount ranging from 0.01 to 0.1, 0.05 to 0.01, or 0.07 to 0.1 wt. %, based on the total weight of the lubricant composition. Alternatively, the metal deactivator may be present in amounts of less than 0.1, less than 0.7, or less than 0.5, wt. %, based on the total weight of the lubricant composition. The metal deactivator may be present in the additive concentrate in an amount ranging from 0.1 to 99, from 1 to 70, from 5 to 50, or from 25 to 50, wt. %, based on the total weight of the additive concentrate.

If employed, the rust inhibitor and/or friction modifier can be of various types. Suitable examples of rust inhibitors and/or friction modifiers include organic acids, their esters, metal salts, amine salts and anhydrides, for example alkyl- and alkenylsuccinic acids and their partial esters with alcohols, diols or hydroxycarboxylic acids, partial amides of alkyl- and alkenylsuccinic acids, 4-nonylphenoxyacetic acid, alkoxy- and alkoxyethoxycarboxylic acids such as dodecyloxyacetic acid, dodecyloxy(ethoxy)acetic acid and the amine salts thereof, and also N-oleoylsarcosine, sorbitan monooleate, lead naphthenate, alkenylsuccinic anhydrides, for example, dodecenylsuccinic anhydride, 2-carboxymethyl-1-dodecyl-3-methylglycerol and the amine salts thereof, and combinations thereof. Additional examples include nitrogen-containing compounds, for example, primary, secondary or tertiary aliphatic or cycloaliphatic amines and amine salts of organic and inorganic acids, for example oil-soluble alkylammonium carboxylates, and also 1-[N,N-bis(2-hydroxyethyl)amino]-3-(4-nonylphenoxy)propan-2-ol, and combinations thereof. Further examples include heterocyclic compounds, for example: substituted imidazolines and oxazolines, and 2-heptadecenyl-1-(2-hydroxyethyl)imidazoline, phosphorus-containing compounds, for example: amine salts of phosphoric acid partial esters or phosphonic acid partial esters, and zinc dialkyldithiophosphates, molybdenum-containing compounds, such as molydbenum dithiocarbamate and other sulphur and phosphorus containing derivatives, sulfur-containing compounds, for example: barium dinonylnaphthalenesulfonates, calcium petroleum sulfonates, alkylthio-substituted aliphatic carboxylic acids, esters of aliphatic 2-sulfocarboxylic acids and salts thereof, glycerol derivatives, for example: glycerol monooleate, 1-(alkylphenoxy)-3-(2-hydroxyethyl)glycerols, 1-(alkylphenoxy)-3-(2,3-dihydroxypropyl) glycerols and 2-carboxyalkyl-1,3-dialkylglycerols, and combinations thereof.

If employed, the rust inhibitor and/or friction modifier can be used in various amounts. The rust inhibitor and/or friction modifier is typically present in the lubricant composition in an amount ranging from 0.01 to 0.1, 0.05 to 0.01, or 0.07 to 0.1, wt. %, based on the total weight of the lubricant composition. Alternatively, the rust inhibitor and/or friction modifier may be present in amounts of less than 1, less than 0.7, or less than 0.5 wt. %, based on the total weight of the lubricant composition. The rust inhibitor and/or friction modifier may be present in the additive concentrate in an amount ranging from 0.01 to 0.1, from 0.05 to 0.01, or from 0.07 to 0.1, wt. %, based on the total weight of the additive concentrate.

If employed, the viscosity index improver (VII) can be of various types. Suitable examples of VIIs include polyacrylates, polymethacrylates, vinylpyrrolidone/methacrylate copolymers, polyvinylpyrrolidones, polybutenes, olefin copolymers, styrene/acrylate copolymers and polyethers, and combinations thereof.

If employed, the VII can be used in various amounts. The VII is typically present in the lubricant composition in an amount ranging from 0.01 to 20, 1 to 15, or 1 to 10 wt. %, based on the total weight of the lubricant composition. Alternatively, the VII may be present in amounts of less than 10, less than 8, or less than 5, wt. %, based on the total weight of the lubricant composition. The VII may be present in the additive concentrate in an amount ranging from 0.01 to 20, from 1 to 15, or from 1 to 10, wt. %, based on the total weight of the additive concentrate.

If employed, the pour point depressant can be of various types. Suitable examples of pour point depressants include polymethacrylate and alkylated naphthalene derivatives, and combinations thereof.

If employed, the pour point depressant can be used in various amounts. The pour point depressant is typically present in the lubricant composition in an amount ranging from 0.01 to 0.1, 0.05 to 0.01, or 0.07 to 0.1, wt. %, each based on the total weight of the lubricant composition. Alternatively, the pour point depressant may be present in amounts of less than 0.1, less than 0.7, or less than 0.5 wt. %, based on the total weight of the lubricant composition. The pour point depressant may be present in the additive concentrate in an amount ranging from 0.1 to 99, from 1 to 70, from 5 to 50, or from 25 to 50, wt. %, based on the total weight of the additive concentrate.

If employed, the dispersant can be of various types. Suitable examples of dispersants include polybutenylsuccinic amides or -imides, polybutenylphosphonic acid derivatives and basic magnesium, calcium and barium sulfonates and phenolates, succinate esters and alkylphenol amines (Mannich bases), and combinations thereof.

The amine dispersant may be a polyalkene amine. The polyalkene amine includes a polyalkene moiety. The polyalkene moiety is the polymerization product of identical or different, straight-chain or branched C_2-6 olefin monomers. Examples of suitable olefin monomers are ethylene, propylene, 1-butene, isobutene, 1-pentene, 2-methylbutene, 1-hexene, 2-methylpentene, 3-methylpentene, and 4-methylpentene. The polyalkene moiety has a number average molecular weight Mn ranging from 200 to 10,000.

In one configuration, the polyalkene amine is derived from a polyisobutene. Particularly suitable polysiobutenes are known as “highly reactive” polyisobutenes which feature a high content of terminal double bonds. Suitable highly reactive polyisobutenes are, for example, polyisobutenes which have a fraction of terminal vinylidene double bonds of greater than 70 mol %, greater than 80 mol %, greater than 85 mol %, greater than 90 mol %, or greater than 92 mol %, based on the total number of double bonds in the polyisobutene. Further preference is given in particular to polyisobutenes which have uniform polymer frameworks. Uniform polymer frameworks are those polyisobutenes which are composed of at least 85, 90, or 95, wt. %, of isobutene units. Such highly reactive polyisobutenes preferably have a number-average molecular weight in the abovementioned range. In addition, the highly reactive polyisobutenes may have a polydispersity ranging from 1.05 to 7, or from 1.1 to 2.5. The highly reactive polyisobutenes may have a polydispersity less than 1.9, or less than 1.5. Polydispersity refers to the quotients of weight-average molecular weight Mw divided by the number-average molecular weight Mn.

The polyalkene amine may include moieties derived from succinic anhydride and may include hydroxyl and/or amino and/or amido and/or imido groups. For example, the amine dispersant may be derived from polyisobutenylsuccinic anhydride which is obtainable by reacting conventional or highly reactive polyisobutene having a number average molecular weight ranging from 300 to 5000 with maleic anhydride by a thermal route or via chlorinated polyisobutene. Particular interest attaches to derivatives with aliphatic polyamines such as ethylenediamine, diethylenetriamine, triethylenetetramine or tetraethylenepentamine.

To prepare the polyalkene amine, the polyalkene component may be aminated in a manner known per se. A preferred process proceeds via the preparation of an oxo intermediate by hydroformylation and subsequent reductive amination in the presence of a suitable nitrogen compound.

The amine dispersant may be represented by the general formula: HNR⁹R¹⁰, where R⁹ and R¹⁰ may each independently be a hydrogen atom or a hydrocarbyl group having from 1 to 17 carbon atoms, or analogs thereof which have been mono- or polyhydroxylated. The amine dispersant may also be a poly(oxyalkyl) radical or a polyalkylene polyamine radical of the general formula Z—NH—(C₁-C₆-alkylene-NH)_m—C₁-C₆-alkylene, where m is an integer ranging from 0 to 5, Z is a hydrogen atom or a hydrocarbyl group having from 1 to 6 carbon atoms with C₁-C₆ alkylene representing the corresponding bridged analogs of the alkyl radicals. The amine dispersant may also be a polyalkylene imine radical composed of from 1 to 10 C₁-C₄ alkylene imine groups; or, together with the nitrogen atom to which they are bonded, are an optionally substituted 5- to 7-membered heterocyclic ring which is optionally substituted by from one to three C₁-C₄ alkyl radicals and optionally bears one further ring heteroatom, such as O or N.

Examples of suitable alkyl radicals include straight-chain or branched radicals having from 1 to 18 carbon atoms, such as methyl, ethyl, iso- or n-propyl, n-, iso-, sec- or tert-butyl, n- or isopentyl; and also n-hexyl, n-heptyl, n-octyl, n-nonyl, n-decyl, n-undecyl, n-tridecyl, n-tetradecyl, n-pentadecyl, n-hexadecyl and n-octadecyl, and also the mono- or polybranched analogs thereof; and also corresponding radicals in which the hydrocarbon chain has one or more ether bridges.

Examples of suitable alkenyl radicals include mono- or polyunsaturated, preferably mono- or di-unsaturated analogs of alkyl radicals has from 2 to 18 carbon atoms, in which the double bonds may be in any position in the hydrocarbon chain.

Examples of C₄-C₁₈ cycloalkyl radical include cyclobutyl, cyclopentyl and cyclohexyl, and also the analogs thereof substituted by from 1 to 3 C₁-C₄ alkyl radicals: The C₁-C₄ alkyl radicals are, for example, selected from methyl, ethyl, iso- or n-propyl, n-, iso-, sec- or tert-butyl.

Examples of the arylalkyl radical include a C₁-C₁₈ alkyl group and an aryl group which are derived from a monocyclic or bicyclic, 4- to 7-membered, in particular, 6 membered aromatic or heteroaromatic group, such as phenyl, pyridyl, naphthyl and biphenyl.

Examples of suitable compounds of the general formula HNR⁹R¹⁰ are: ammonia; primary amines such as methylamine, ethylamine, n-propylamine, isopropylamine, n-butylamine, isobutylamine, sec-butylamine, tert-butylamine, pentylamine, hexylamine, cyclopentylamine and cyclohexylamine; primary amines of the formulas: CH₃—O—C₂H₄—NH₂, C₂H₅—O—C₂H₄—NH₂, CH₃—O—C₃H₆—NH₂, C₂H₅—O—C₃H₆—NH₂, C₄H₉—O—C₄H₈—NH₂, HO—C₂H₄—NH₂, HO—C₃H₆—NH₂ and HO—C₄H₈—NH₂; secondary amines, for example dimethylamine, diethylamine, methylethylamine, di-n-propylamine, diisopropylamine, diisobutylamine, di-sec-butylamine, di-tert-butylamine, dipentylamine, dihexylamine, dicyclopentylamine, dicyclohexylamine and diphenylamine; and also secondary amines of the formulas: (CH₃—O—C₂H₄)₂NH, (C₂H₅—O—C₂H₄)₂NH, (CH₃—O—C₃H₆)₂NH, (C₂H₅—O—C₃H₆)₂NH, (n-C₄H₉—O—C₄H₈)₂NH, (HO—C₂H₄)₂NH, (HO—C₃H₆)₂NH and (HO—C₄H₈)₂NH; and heterocyclic amines, such as pyrrolidine, piperidine, morpholine and piperazine, and also their substituted derivatives, such as N—C_1-6 alkylpiperazines and dimethylmorpholine; and polyamines and polyimines, such as n-propylenediamine, 1,4-butanediamine, 1,6-hexanediamine, diethylenetriamine, triethylenetetramine and polyethylene imines, and also their alkylation products, for example 3-(dimethylamino)-n-propylamine, N,N-dimethylethylenediamine, N,N-diethylethylenediamine and N,N,N′,N′-tetramethyldiethylenetriamine.

If employed, the dispersant can be used in various amounts. The dispersant is typically present in the lubricant composition in an amount ranging from 0.01 to 15, 0.1 to 12, 0.5 to 10, or 1 to 8, wt. %, based on the total weight of the lubricant composition. Alternatively, the dispersant may be present in amounts of less than 15, less than 12, less than 10, less than 5, or less than 1, wt. %, based on the total weight of the lubricant composition. These dispersants may be present in the additive concentrate in an amount ranging from 0.1 to 99, from 1 to 70, from 5 to 50, or from 25 to 50, wt. %, based on the total weight of the additive concentrate.

If employed, the detergent can be of various types. Suitable examples of detergents include overbased or neutral metal sulphonates, phenates and salicylates, and combinations thereof.

If employed, the detergent can be used in various amounts. The detergent is typically present in the lubricant composition in an amount ranging from 0.01 to 5, 0.1 to 4, 0.5 to 3, or 1 to 3 wt. %, based on the total weight of the lubricant composition. Alternatively, the detergent may be present in amounts of less than 5, less than 4, less than 3, less than 2, or less than 1 wt. %, based on the total weight of the lubricant composition. The detergent is typically present in the additive concentrate in an amount ranging from 0.1 to 99, from 1 to 70, from 5 to 50, or from 25 to 50, wt. %, based on the total weight of the additive concentrate.

In various embodiments, the lubricant composition is substantially free of water, e.g. the lubricant composition includes less than 5, less than 4, less than 3, less than 2, less than 1, less than 0.5, or less than 0.1, wt. %, of water based on the total weight of the lubricant composition. Alternatively, the lubricant composition may be completely free of water.

Some of the compounds described above may interact in the lubricant composition, so the components of the lubricant composition in final form may be different from those components that are initially added or combined together. Some products formed thereby, including products formed upon employing the lubricant composition of this invention in its intended use, are not easily described or describable. Nevertheless, all such modifications, reaction products, and products formed upon employing the lubricant composition of this invention in its intended use, are expressly contemplated and hereby included herein. Various embodiments of this invention include one or more of the modification, reaction products, and products formed from employing the lubricant composition, as described above.

A method of lubricating a system is provided. The method includes contacting the system with the lubricant composition described above. The system may further include an internal combustion engine. Alternatively, the system may further include any combustion engine or application that utilizes a lubricant composition.

In addition, a method of forming the lubricant composition is provided. The method includes combining the base oil and the amine compound. The amine compound may be incorporated into the base oil in any convenient way. Thus, the amine compound can be added directly to the base oil by dispersing or dissolving it in the base oil at the desired level of concentration. Alternatively, the base oil may be added directly to the amine compound in conjunction with agitation until the amine compound is provided at the desired level of concentration. Such blending may occur at ambient or elevated temperatures. In one embodiment, one or more of the additives are blended into the additive concentrate that is subsequently blended into the base oil to make the lubricant composition. The concentrate will typically be formulated to provide the desired concentration in the lubricant composition when the concentrate is combined with a predetermined amount of base oil.

This invention will be further understood by reference to the following examples, wherein all parts are parts by weight (or mass), unless otherwise noted.

EXAMPLES

A fully formulated lubricant composition containing dispersant, detergent, aminic antioxidant, phenolic antioxidant, anti-foam, base oil, ZDDP, pour point depressant and viscosity modifier was prepared. This lubricant composition, which was representative of a commercial crankcase lubricant, was used as a reference lubricant. The reference lubricant was combined with the amine compound to improve the TBN of the lubricant composition. The amine compound was added in an amount sufficient to provide 3 units of TBN over the TBN of the reference lubricant. These compositions are exemplified in Table 1. An additional amount of base oil was added to each of the samples to provide a total mass.

TABLE 1
Exemplary Lubricant Composition and Reference Lubricant.
	Reference Lubricant	Inventive #1
	Reference Lubricant (g)	94.00	94.00
	Additional Base Oil (g)	6	3.88
	1-dodecylamine	—	1.24
	Total Weight (g)	100.00	100.00
	Additional TBN	—	3

The TBN of the exemplary amine compound was determined in accordance with each of ASTM D4739 (in units of mg KOH/g). The exemplary amine compound (1-dodecylamine) has a TBN of 295 mg KOH/g.

It is to be understood that the appended claims are not limited to express and particular compounds, compositions, or methods described in the detailed description, which may vary between particular embodiments that fall within the scope of the appended claims. With respect to any Markush groups relied upon herein for describing particular features or aspects of various embodiments, it is to be appreciated that different, special, and/or unexpected results may be obtained from each member of the respective Markush group independent from all other Markush members. Each member of a Markush group may be relied upon individually and/or in combination and provides adequate support for specific embodiments within the scope of the appended claims.

It is also to be understood that any ranges and subranges relied upon in describing various embodiments of the present invention independently and collectively fall within the scope of the appended claims and are understood to describe and contemplate all ranges, including whole and/or fractional values therein, even if such values are not expressly written herein. One of skill in the art readily recognizes that the enumerated ranges and subranges sufficiently describe and enable various embodiments of the present invention and such ranges and subranges may be further delineated into relevant halves, thirds, quarters, fifths, and so on. As just one example, a range “ranging from 0.1 to 0.9” may be further delineated into a lower third, i.e., from 0.1 to 0.3, a middle third, i.e., from 0.4 to 0.6, and an upper third, i.e., from 0.7 to 0.9, which individually and collectively are within the scope of the appended claims and may be relied upon individually and/or collectively and provide adequate support for specific embodiments within the scope of the appended claims.

In addition, with respect to the language which defines or modifies a range, such as “at least,” “greater than,” “less than,” “no more than,” and the like, it is to be understood that such language includes subranges and/or an upper or lower limit. As another example, a range of “at least 10” inherently includes a subrange ranging from at least 10 to 35, a subrange ranging from at least 10 to 25, a subrange from 25 to 35, and so on, and each subrange may be relied upon individually and/or collectively and provides adequate support for specific embodiments within the scope of the appended claims. Finally, an individual number within a disclosed range may be relied upon and provides adequate support for specific embodiments within the scope of the appended claims. For example, a range “ranging from 1 to 9” includes various individual integers, such as 3, as well as individual numbers including a decimal point (or fraction), such as 4.1, which may be relied upon and provide adequate support for specific embodiments within the scope of the appended claims.

The invention has been described in an illustrative manner and it is to be understood that the terminology which has been used is intended to be in the nature of words of description rather than of limitation. Many modifications and variations of the present invention are possible in light of the above teachings and the invention may be practiced otherwise than as specifically described.

Claims

1. A lubricant composition comprising:

a base oil; and

from 0.01 to 10 wt. % of an amine compound based on a total weight of said lubricant composition, wherein said amine compound has the formula:

where R1 and R2 are each independently straight or branched chain acyclic alkyl groups having from 1 to 20 carbon atoms,

where the alpha carbon of R1 or R2 is primary if R1 or R2 is an alkyl group having more than one carbon atom respectively, and

wherein at least 90 wt. % of said amine compound remains unreacted in said lubricant composition based on a total weight of said amine compound prior to any reaction in the lubricant composition.

2. A lubricant composition according to claim 1 wherein at least 95 wt. % of said amine compound remains unreacted in said lubricant composition based on the total weight of said amine compound prior to any reaction in the lubricant composition.

3. A lubricant composition according to claim 2 wherein said lubricant composition comprises a collective amount of acids, anhydrides, triazoles, and/or oxides which is less than 0.1 wt. % based on the total weight of the lubricant composition.

4. A lubricant composition according to claim 1 free of acids, anhydrides, triazoles, and oxides.

5. A lubricant composition according to claim 1 comprising from 0.5 to 5 wt. % of said amine compound based on the total weight of said lubricant composition.

6. A lubricant composition according to claim 1 wherein said amine compound has a TBN value of at least 70 mg KOH/g of said amine compound when tested according to ASTM D4739.

7. A lubricant composition according to claim 6 wherein the alpha carbons of R1 and R2 are primary if both R1 and R2 are independently alkyl groups having more than one carbon atom.

8. A lubricant composition according to claim 1 wherein at least one group designated by R1 or R2 is unsubstituted.

9. A lubricant composition according to claim 1 wherein both R1 and R2 are un-substituted and each independently comprises an alkyl group having from 1 to 17 carbon atoms.

10. A lubricant composition according to claim 1 wherein said amine compound is bis(2-ethylhexyl)amine, ditridecylamine, n-hexylamine, N-octylamine, N-decylamine, n-dodecylamine, n-hexadecylamine, n-octadecylamine or combinations thereof.

11. A lubricant composition according to claim 10 wherein said base oil comprises an API Group I Oil, an API Group II Oil, an API Group III Oil, an API Group IV Oil, or combinations thereof, and wherein said base oil has a viscosity ranging from 1 to 20 cSt when tested at 100° C. according to ASTM D445.

12. A method of lubricating a system comprising an internal combustion engine with the lubricant composition of claim 1, said method comprising: contacting the internal combustion engine with the lubricant composition, wherein the lubricant composition provides a TBN ranging from 5 to 15 mg KOH/g of lubricant composition.

13. An additive concentrate for a lubricant composition comprising:

an anti-wear additive comprising sulfur and/or phosphorous; and

an amine compound having the formula:

where R1 and R2 are each independently straight or branched chain acyclic alkyl groups having from 1 to 14 carbon atoms,

where the alpha carbon of R1 or R2 is primary if R1 or R2 is an alkyl group having more than one carbon atom respectively.

14. An additive concentrate according to claim 13 wherein R1 and R2 are each independently straight or branched chain acyclic alkyl groups having from 3 to 12 carbon atoms.

15. An additive concentrate according to claim 13 wherein said amine compound has a TBN value of at least 70 mg KOH/g of said amine compound when tested according to ASTM D4739.

16. An additive concentrate according to claim 13 wherein said alpha carbon of both R1 and R2 is primary if both R1 and R2 are alkyl groups having more than one carbon atom, and wherein both R1 and R2 are un-substituted.

17. An additive concentrate according to claim 13 wherein said amine compound is bis(2-ethylhexyl)amine, ditridecylamine, n-hexylamine, N-octylamine, N-decylamine, n-dodecylamine, n-hexadecylamine, n-octadecylamine or combinations thereof.

18. An additive concentrate according to claim 13 further comprising a dispersant.

19. An additive concentrate according to claim 18 further comprising a detergent.

20. An additive concentrate according to claim 19 further comprising an antioxidant.