Lubricating composition for automotive transmissions

Abstract

The invention relates to an additive package comprising:-at least one phosphite compound of formula (1), and-at least one thiadiazole compound corresponding to one of formulae (2), (3), (4) or (5) [Chemical Formula 1] [Chemical Formula 2] [Chemical Formula 3] [Chemical Formula 4] [Chemical Formula 5] wherein: R and R1 independently of each other represent a hydrogen atom; or a linear or branched, saturated or unsaturated hydrocarbon group comprising 1 to 24 carbon atoms, said hydrocarbon group optionally comprising one or more heteroatoms, R2 and R3 independently of each other represent a hydrogen atom, or a linear or branched, saturated or unsaturated hydrocarbon group comprising 1 to 24 carbon atoms, said hydrocarbon group optionally comprising one or more heteroatoms, or a linear or branched, saturated or unsaturated hydrocarbon group comprising 1 to 24 carbon atoms, said hydrocarbon group optionally comprising one or more heteroatoms.

Description

Technical Field

[0001] This invention relates to the field of lubricating compositions, particularly for use in motor vehicles, especially for lubricating transmission components of motor vehicles, particularly transmission gears of internal combustion engines or electric motors. Background Technology

[0002] Motor vehicle transmission components operate under high loads and high speeds. Therefore, the oils used in these transmissions (also known as "lubricating compositions" or "lubricants") must be particularly effective in preventing component wear and fatigue, and especially in protecting gear teeth from scuffing.

[0003] Wear occurs under high load conditions and can be assessed by monitoring visible damage.

[0004] Prevention of this phenomenon includes reducing contact stress through appropriate component geometry and reducing friction by avoiding adhesion. Lubricating compositions participate in this prevention process primarily through the physicochemical reactivity of their additives.

[0005] Transmission fluids are typically given wear-protective properties by adding anti-wear and extreme pressure additives containing sulfur, phosphorus, or boron.

[0006] Therefore, these additives can have excellent effects on the durability of the lubricating oils they are incorporated into, but they have disadvantages from a corrosion perspective, especially for copper parts.

[0007] The inventors of this invention have discovered that specific combinations of phosphorus and sulfur-containing additives can be used in lubricating compositions that provide good corrosion resistance to copper in addition to good durability.

[0008] Therefore, the object of the present invention is to provide a composition that enables lubrication of components of manual or automatic transmissions, particularly transmission gears, preferably electric vehicle transmission gears, the composition having improved corrosion resistance and good durability. Summary of the Invention

[0009] More specifically, the present invention relates to an additive package comprising: - at least one phosphite compound of formula (1), and - At least one thiadiazole compound corresponding to one of formulas (2), (3), (4), or (5), [Chemical Formula 1]

[0010] [Chemical Formula 2]

[0011] [Chemical Formula 3]

[0012] [Chemical Formula 4]

[0013] [Chemical Formula 5]

[0014] in: R and R 1 Each of the following can independently represent a hydrogen atom, or a straight-chain or branched, saturated or unsaturated hydrocarbon group comprising 1 to 24 carbon atoms, wherein the hydrocarbon group optionally includes one or more heteroatoms. R 2 and R 3 Each of the above can represent a hydrogen atom independently, or a straight-chain or branched, saturated or unsaturated hydrocarbon group comprising 1 to 24 carbon atoms, wherein the hydrocarbon group optionally includes one or more heteroatoms.

[0015] A bond indicated by a dashed line means that it can be a double bond or a single bond. If the bond is an intracyclic double bond, then according to the valence state rules, the nitrogen atom bonded to this double bond will not be bonded to a hydrogen atom. If the bond is an exocyclic double bond, then according to the valence state rules, the sulfur atom will not be bonded to R. 2 Or R 3 Connect. At least one of the dashed keys is a double key.

[0016] Preferably, the mass ratio between the phosphite compound of formula (1) and the thiadiazole compound is in the range of 1 / 10 to 10 / 1, preferably 1 / 5 to 5 / 1, and more preferably 1 / 2 to 2 / 1.

[0017] According to one embodiment, the additive package further comprises at least one dispersant, preferably a borate dispersant, more preferably selected from borate succinimide, more preferably selected from borate polyisobutylene succinimide, preferably the at least one dispersant accounting for 10 to 70% by weight of the total weight of the additive package, more preferably 20 to 60% by weight.

[0018] Preferably, the mass ratio between the sulfur content and phosphorus content provided by the phosphite compound of formula (1) and the thiadiazole compound ranges from 1 / 1 to 3.5 / 1.

[0019] According to one embodiment of the additive package: R and R 1 Each of the terms represents a hydrogen atom or a straight-chain or branched alkyl group, wherein the alkyl group comprises 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, more preferably 2 to 8 carbon atoms, and preferably R and R 1The alkyl group refers to a straight-chain or branched alkyl group, wherein the alkyl group has 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, and more preferably 2 to 8 carbon atoms. and / or - The at least one thiadiazole compound corresponds to formula (2), wherein R 2 and R 3 The groups -SR' represent hydrogen atoms independently of each other, including straight-chain or branched alkyl groups comprising 6 to 18 carbon atoms, wherein R' may be a straight-chain or branched alkyl group comprising 6 to 18 carbon atoms.

[0020] According to one embodiment, the additive package according to the invention further comprises one or more thiophosphate compounds, wherein the mass ratio between the thiadiazole compound and the thiophosphate compound ranges from 1 / 5 to 2 / 1, preferably 1 / 2 to 1.5 / 1, and preferably the at least one thiophosphate compound corresponds to formula (6): [Chemical Formula 6]

[0021] in: R 5 and R 6 Each of the following can independently represent a hydrogen atom, or a straight-chain or branched, saturated or unsaturated hydrocarbon group comprising 1 to 24 carbon atoms, wherein the hydrocarbon group optionally includes one or more heteroatoms. R 4 Represents the group OR 4a Or the SR group 4a , where R 4a This refers to a straight-chain or branched, saturated or unsaturated hydrocarbon group comprising 1 to 24 carbon atoms, wherein the hydrocarbon group optionally includes one or more heteroatoms. X represents a sulfur atom or an oxygen atom. The understanding is that if X represents an oxygen atom, then R 4 Indicates the group SR 4a .

[0022] According to the preferred embodiment of the additive package: - R 5 and R 6 Each of the above can independently represent a hydrogen atom, or a straight-chain or branched alkyl group, wherein the alkyl group comprises 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, more preferably 2 to 8 carbon atoms, and / or - X represents a sulfur atom, and / or - R 4 Indicates the group SR 4a , where R 4a Represents group R 4b COOH, where R 4bThe alkyl group is a straight-chain or branched alkyl group, which comprises 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, and more preferably 2 to 8 carbon atoms.

[0023] According to one embodiment, the additive package further comprises at least one phosphate ester compound, preferably a phosphate ester compound corresponding to formula (7): [Chemical Formula 7]

[0024] in: R 7 and R 8 The two groups are independently selected from: hydrogen atoms, or straight-chain or branched, saturated or unsaturated hydrocarbon groups containing 4 to 24 carbon atoms, and two R groups. 7 Or R 8 At least one of them is a straight-chain or branched, saturated or unsaturated hydrocarbon group containing 4 to 24 carbon atoms.

[0025] According to one embodiment, the additive package comprises: - At least 0.5% by weight, preferably 0.5 to 20% by weight, more preferably 1 to 10% by weight, or even 2 to 5% by weight of a phosphite compound of formula (1), - At least 1% by weight, preferably 1 to 20% by weight, more preferably 2 to 15% by weight, or even 3 to 10% by weight of a thiadiazole compound. - Optionally 1 to 20% by weight, preferably 2 to 15% by weight, preferably 3 to 10% by weight, of compounds selected from: (i) thiophosphate compounds, preferably corresponding to formula (6), (ii) phosphate compounds, preferably corresponding to formula (7), and (iii) mixtures thereof. - Optionally up to 100% by weight of base oil and / or additives other than phosphites, thiadiazoles, phosphates, and thiophosphates. Relative to the total weight of the additive package.

[0026] The present invention also relates to a lubricating composition comprising:

[0027] - At least 60% by weight of base oil, relative to the total weight of the lubricating composition. - At least one additive package according to the invention.

[0028] Preferably, the lubricating composition according to the invention comprises: - 80 to 99.5% by weight, preferably 85 to 99% by weight of base oil, - 0.5 to 20% by weight, preferably 1 to 15% by weight of the additive package, Relative to the total weight of the lubricating composition.

[0029] According to a preferred embodiment, the lubricating composition according to the invention comprises: - 70 to 99% by weight, preferably 85 to 99% by weight of base oil, - 0.01 to 5% by weight, preferably 0.05 to 1% by weight, of a phosphite compound. - 0.01 to 5% by weight, preferably 0.05 to 1% by weight, of a thiadiazole compound. - Optionally 0.01 to 5% by weight, preferably 0.05 to 1% by weight, of compounds selected from: (i) thiophosphate compounds, preferably thiophosphate compounds corresponding to formula (6), (ii) phosphate compounds, preferably phosphate compounds corresponding to formula (7), and (iii) mixtures thereof. - Optionally 1 to 20% by weight of a dispersant, preferably 1 to 15% by weight, more preferably 2 to 10% by weight of a dispersant. - Optionally up to 100% by weight of an additive different from the aforementioned phosphites, thiadiazoles, thiophosphates, phosphates, and dispersant additives. Relative to the total weight of the lubricating composition.

[0030] Preferably, the lubricating composition according to the invention has a kinematic viscosity range of 1 to 20 mm at 100°C. 2 / s, preferably 1.5 to 15 mm 2 / s, more preferably 2 to 10 mm 2 / s.

[0031] The present invention also relates to the use of the additive package according to the invention in the preparation of a lubricating composition intended to lubricate at least one mechanical component of a motor vehicle. Preferably, the component is a transmission assembly, and / or Preferably, the motor vehicle is an electric vehicle.

[0032] Preferably, the lubricating composition according to the invention is used for lubricating at least one mechanical component of a motor vehicle. Preferably, the component is a transmission assembly, and / or Preferably, the motor vehicle is an electric vehicle.

[0033] The lubricating composition according to the invention has improved corrosion resistance.

[0034] The advantage of the lubricating composition according to the invention is that it has excellent properties for reducing wear.

[0035] The lubricating composition according to the invention also has good durability.

[0036] The lubricating composition also has particularly satisfactory properties of reducing corrosion and wear even under high loads, even in the absence of zinc-based additives.

[0037] In the remainder of the text, unless otherwise stated, the expressions “between… and…”, “ranging from… to…”, and “(from)… (changes) to…” are equivalent and are intended to include limits.

[0038] Unless otherwise stated, quantities in the product are expressed in weight relative to the total weight of the product. Detailed Implementation

[0039] This invention relates to lubricating compositions comprising: - At least one base oil, - At least one additive package.

[0040] The additive package of the present invention comprises: - at least one phosphite compound of formula (1), and - At least one thiadiazole compound corresponding to one of formulas (2), (3), (4), or (5), [Chemical Formula 1]

[0041] [Chemical Formula 2]

[0042] [Chemical Formula 3]

[0043] [Chemical Formula 4]

[0044] [Chemical Formula 5]

[0045] in: R and R 1 Each of the following can independently represent a hydrogen atom, or a straight-chain or branched, saturated or unsaturated hydrocarbon group comprising 1 to 24 carbon atoms, wherein the hydrocarbon group optionally includes one or more heteroatoms. R 2 and R 3Each of the above can represent a hydrogen atom independently, or a straight-chain or branched, saturated or unsaturated hydrocarbon group comprising 1 to 24 carbon atoms, wherein the hydrocarbon group optionally includes one or more heteroatoms.

[0046] A bond indicated by a dashed line means that it can be a double bond or a single bond. If the bond is a double bond, then according to the valence state rules, the nitrogen atom bonded to this double bond will not be bonded to a hydrogen atom. If the bond is an exocyclic double bond, then according to the valence state rules, the sulfur atom will not be bonded to R. 2 Or R 3 connect.

[0047] The inventors have indeed discovered that combining the two additives, phosphite and thiadiazole, unexpectedly improves the corrosion resistance and durability of lubricating compositions containing the additive combination.

[0048] Therefore, the present invention enables the provision of additive packages and lubricating compositions that improve corrosion resistance while maintaining good durability and possessing a simple composition. In particular, the additive packages and lubricating compositions according to the present invention do not require the addition of zinc-based anti-wear additives, or phenol salts / esters, sulfonates / esters, or salicylates / esters-type detergents, and do not require large amounts of phosphorus or sulfur.

[0049] Phosphite compounds of formula (1)

[0050] The additive package according to the present invention comprises one or more phosphite-type additives, said phosphite-type additives corresponding to formula (1): [Chemical Formula 1]

[0051] in, R and R 1 Each of the above can represent a hydrogen atom independently, or a straight-chain or branched, saturated or unsaturated hydrocarbon group comprising 1 to 24 carbon atoms, wherein the hydrocarbon group optionally includes one or more heteroatoms.

[0052] For the purposes of this invention, the term "hydrocarbon" means that the chain comprises carbon and hydrogen atoms, and optionally one or more heteroatoms, such as oxygen or nitrogen atoms.

[0053] Advantageously, the phosphite compounds of formula (1) do not contain sulfur atoms.

[0054] According to one implementation, R and R 1 Each of the terms represents a hydrogen atom or a straight-chain or branched alkyl group, wherein the alkyl group comprises 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, and more preferably 2 to 8 carbon atoms.

[0055] Preferably, R and R1 The alkyl group is a straight-chain or branched alkyl group, wherein the alkyl group has 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, and more preferably 2 to 8 carbon atoms.

[0056] Preferably, R and R 1 The same, and represents a straight-chain or branched alkyl group, wherein the alkyl group has 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, more preferably 2 to 8 carbon atoms.

[0057] In the context of this invention, the term "alkyl" refers to a saturated group consisting of carbon and hydrogen atoms.

[0058] In a particularly advantageous manner, the phosphite additive of formula (1) is dibutylhydrophosphite.

[0059] The additive package may optionally contain a mixture of compounds corresponding to formula (1).

[0060] According to one embodiment, the additive package contains at least 0.5% by weight, preferably 0.5 to 20% by weight, more preferably 1 to 10% by weight, or even 2 to 5% by weight of a phosphite compound of formula (1), relative to the total weight of the additive package.

[0061] Thiadiazole compounds

[0062] The additive package according to the present invention comprises one or more thiadiazole additives, said thiadiazole additives corresponding to one of formulas (2), (3), (4), or (5).

[0063] [Chemical Formula 2]

[0064] [Chemical Formula 3]

[0065] [Chemical Formula 4]

[0066] [Chemical Formula 5]

[0067] in: R 2 and R 3 Each of the above can represent a hydrogen atom independently, or a straight-chain or branched, saturated or unsaturated hydrocarbon group comprising 1 to 24 carbon atoms, wherein the hydrocarbon group optionally includes one or more heteroatoms.

[0068] A bond indicated by a dashed line means that it can be a double bond or a single bond. If the bond is a double bond, then according to the valence state rules, the nitrogen atom connected to the double bond is not connected to a hydrogen atom.

[0069] In particular, compounds of formulas (2), (3), (4), or (5) may correspond to one of formulas (2bis), (3bis), (4bis), or (5bis), respectively: [Chemical formula 2bis]

[0070] [Chemical formula 3bis]

[0071] [Chemical formula 4bis]

[0072] [Chemical formula 5bis]

[0073] For example, the compound of formula (2) can be a compound of formula (8), formula (9), formula (10), or formula (11): [Chemical Formula 8]

[0074] [Chemical Formula 9]

[0075] [Chemical Formula 10]

[0076] [Chemical Formula 11]

[0077] Preferably, R 2 and R 3 The groups -SR' represent hydrogen atoms independently of each other, including straight-chain or branched alkyl groups comprising 6 to 18 carbon atoms, wherein R' may be a straight-chain or branched alkyl group comprising 6 to 18 carbon atoms.

[0078] Preferably, in the thiadiazole compounds of formulas (2), (3), (4), and / or (5), R 2 and R 3 Not all of them are hydrogen atoms.

[0079] Preferably, the additive package according to the invention comprises at least one thiadiazole compound corresponding to formula (2).

[0080] The additive package may optionally contain a mixture of one or more thiadiazole compounds corresponding to formula (2), (3), (4), or (5).

[0081] According to an advantageous embodiment, the additive package according to the invention comprises a mixture of compounds corresponding to formula (2).

[0082] According to one embodiment, the additive package contains at least 1% by weight, preferably 1 to 20% by weight, more preferably 2 to 15% by weight, or even 3 to 10% by weight of a thiadiazole compound of formula (2), (3), (4), and / or (5), relative to the total weight of the additive package.

[0083] Preferably, the mass ratio between the amount of the phosphite compound of formula (1) and the amount of the thiadiazole compound of formulas (2), (3), (4), and / or (5) is in the range of 1 / 10 to 10 / 1, preferably 1 / 5 to 5 / 1, more preferably 1 / 2 to 2 / 1.

[0084] According to a particularly advantageous embodiment, the additive according to the invention comprises at least one phosphite compound of formula (1) and at least one thiadiazole compound of formula (2), wherein: R and R 1 Independently representing straight-chain or branched alkyl groups having 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, more preferably 2 to 8 carbon atoms; and / or R 2 and R 3 The groups -SR' represent hydrogen atoms independently of each other, including straight-chain or branched alkyl groups comprising 6 to 18 carbon atoms, wherein R' may be a straight-chain or branched alkyl group comprising 6 to 18 carbon atoms.

[0085] Advantageously, the additive package comprises a combination of phosphite and thiadiazole compounds as defined in this invention with at least one compound selected from: (i) thiophosphate compounds, particularly thiophosphate compounds of formula (6), or (ii) phosphate compounds, particularly phosphate compounds of formula (7).

[0086] Thiophosphate additives

[0087] According to one embodiment, the additive package further comprises at least one thiophosphate compound, preferably a thiophosphate compound corresponding to formula (6): [Chemical Formula 6]

[0088] in: R 5 and R 6Each of the following can independently represent a hydrogen atom, or a straight-chain or branched, saturated or unsaturated hydrocarbon group comprising 1 to 24 carbon atoms, wherein the hydrocarbon group optionally includes one or more heteroatoms. R 4 Represents the group OR 4a Or the SR group 4a , where R 4a This refers to a straight-chain or branched, saturated or unsaturated hydrocarbon group comprising 1 to 24 carbon atoms, wherein the hydrocarbon group optionally includes one or more heteroatoms. X represents a sulfur atom or an oxygen atom. The understanding is that if X represents an oxygen atom, then R 4 Indicates the group SR 4a .

[0089] Advantageously, when the additive comprises a thiophosphate compound, the mass ratio between the amount of the thiadiazole compound and the amount of the thiophosphate compound ranges from 1 / 5 to 2 / 1, preferably from 1 / 2 to 1.5 / 1. The inventors have indeed observed that when the lubricating composition has this mass ratio between the thiadiazole compound and the thiophosphate compound, the anti-corrosion properties are further improved.

[0090] Preferably, in equation (6): - R 5 and R 6 Each of the above can independently represent a hydrogen atom, or a straight-chain or branched alkyl group, wherein the alkyl group comprises 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, more preferably 2 to 8 carbon atoms, and / or - X represents a sulfur atom, and / or - R 4 Indicates the group SR 4a , where R 4a Represents group R 4b COOH, where R 4b The alkyl group is a straight-chain or branched alkyl group, which comprises 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, and more preferably 2 to 8 carbon atoms.

[0091] The additive package may optionally contain a mixture of thiophosphate compounds, or even a mixture of several compounds corresponding to formula (6).

[0092] According to one embodiment, the additive package contains 1 to 20% by weight, preferably 2 to 15% by weight, preferably 3 to 10% by weight, of a thiophosphate compound, preferably a thiophosphate compound corresponding to formula (6), relative to the total weight of the additive package.

[0093] Phosphate ester additives

[0094] According to one embodiment, the additive package further comprises at least one phosphate ester compound, preferably a phosphate ester compound corresponding to formula (7): [Chemical Formula 7]

[0095] in: R 7 and R 8 The two groups are independently selected from: hydrogen atoms, or straight-chain or branched, saturated or unsaturated hydrocarbon groups containing 4 to 24 carbon atoms, and two R groups. 7 Or R 8 At least one of them is a straight-chain or branched, saturated or unsaturated hydrocarbon group containing 4 to 24 carbon atoms.

[0096] Within the scope of this invention, phosphate ester compounds are different from thiophosphate ester compounds, especially in that phosphate ester compounds do not contain sulfur atoms.

[0097] Preferably, R 7 and R 8 The aliphatic groups are independently selected from hydrogen atoms or straight-chain or branched, saturated or unsaturated aliphatic groups containing 4 to 24 carbon atoms, preferably 8 to 20 carbon atoms.

[0098] The additive package may optionally contain a mixture of phosphate ester compounds, or even a mixture of several compounds corresponding to formula (7).

[0099] According to one embodiment, the additive package contains 1 to 25% by weight, preferably 2 to 20% by weight, preferably 3 to 15% by weight, of a phosphate ester compound, preferably corresponding to formula (7), relative to the total weight of the additive package.

[0100] Other components of the additive package or lubricating composition

[0101] The additive package may optionally further comprise one or more base oils, and / or one or more functional additives that are different from the phosphite additives, different from the thiadiazole additives, different from the thiophosphate additives, and different from the phosphate additives.

[0102] Among the functional additives that may be added, which are different from the phosphite additive, the thiadiazole additive, and the (thio)phosphate additive, dispersants, antioxidants, corrosion inhibitors, defoamers, viscosity index improvers, and mixtures thereof may be mentioned.

[0103] base oil

[0104] Preferably, the additive package according to the invention comprises at least one base oil having a kinematic viscosity range of 1.5 to 35 cSt at 100°C according to ASTM D445. Advantageously, the base oil in the additive package according to the invention has a kinematic viscosity range of 1.5 to 35 cSt at 100°C.

[0105] These base oils can be selected from base oils commonly used in the lubricant industry, such as mineral oils, synthetic oils, or natural oils, animal or vegetable oils, or mixtures thereof. Typically, the base oils are non-aqueous base oils.

[0106] It can be a mixture of several base oils, such as a mixture of two, three, or four base oils.

[0107] Specifically, the base oil may be a mineral base oil or a synthetic base oil or a mixture thereof, wherein the mineral base oil or synthetic base oil belongs to Group I to V of the type defined in the API classification (or its equivalent in the ATIEL classification), as presented in Table 1 below.

[0108] [Table 1]

[0109] Mineral base oils include all types of base oils obtained through atmospheric and vacuum distillation of crude oil, followed by refining operations such as solvent extraction, deasphalting, solvent dewaxing, hydrotreatment, hydrocracking, hydroisomerization, and hydrofinishing.

[0110] A mixture of bio-based synthetic oils and mineral oils can also be used.

[0111] Generally, there are no limitations on using different base oils to obtain the additive packages and lubricating compositions according to the invention, provided that they have properties suitable for transmissions, especially electric vehicle transmissions, particularly in terms of viscosity, viscosity index, or oxidation resistance.

[0112] The base oil of the additive package and lubricating composition according to the invention may also be selected from synthetic oils, such as esters of certain carboxylic acids and alcohols, polyalphaolefins (PAO), and polyalkylene glycols (PAG), which are obtained by polymerization or copolymerization of alkylene oxides containing 2 to 8 carbon atoms, particularly 2 to 4 carbon atoms.

[0113] PAO used as a base oil is derived, for example, from monomers containing 4 to 32 carbon atoms, such as octene or decene. The weight-average molecular weight of PAO can vary widely. Preferably, the weight-average molecular weight of PAO is less than 600 Da. The weight-average molecular weight of PAO can also range from 100 to 600 Da, 150 to 600 Da, or 200 to 600 Da.

[0114] Advantageously, the base oil in the additive package and / or lubricating composition according to the invention may be selected from Group II or Group III base oils.

[0115] According to alternative embodiments, the base oil in the additive package and / or composition according to the invention is selected from: polyalphaolefin (PAO), polyalkylene glycol (PAG), and esters of carboxylic acids and alcohols.

[0116] The additive package may contain 1 to 80% by weight of base oil, preferably 2 to 50% by weight of base oil, and more preferably 5 to 30% by weight of base oil.

[0117] dispersant

[0118] According to one embodiment, the additive package according to the invention further comprises: at least one dispersant, preferably a borate dispersant, more preferably selected from borate succinimide, and even more preferably from borate polyisobutylene succinimide. Typically, the dispersant ensures that insoluble solid contaminants remain suspended and are removed, said insoluble solid contaminants being secondary oxidation products formed during the operation of the lubricating composition.

[0119] According to this embodiment, preferably, the additive package contains 5 to 80% by weight of a dispersant, preferably 10 to 70% by weight of a dispersant, more preferably 20 to 60% by weight of a dispersant, relative to the total weight of the additive package.

[0120] The additive packages and / or lubricating compositions according to the invention may contain all types of dispersants known to those skilled in the art.

[0121] antioxidants

[0122] The additive package according to the present invention may contain at least one antioxidant additive.

[0123] The antioxidant additives typically delay the degradation of the composition during use. This degradation may specifically manifest as the formation of deposits, the presence of sludge, or an increase in the viscosity of the composition.

[0124] Specifically, antioxidant additives act as free radical inhibitors or hydroperoxide decomposers. Among commonly used antioxidant additives, phenolic and amine antioxidant additives are mentioned. Phenolic antioxidant additives can be ashless or in the form of neutral or basic metal salts. In particular, antioxidant additives can be selected from: sterically hindered phenols, sterically hindered phenolic esters, and sterically hindered phenols containing thioether bridges, diphenylamine, and those with at least one C1-C bond. 12 Alkyl-substituted diphenylamines, N,N'-dialkylaryl diamines, and mixtures thereof.

[0125] Preferably, according to the invention, the sterically hindered phenol is selected from compounds containing a phenolic group, wherein at least one carbon adjacent to a carbon having alcohol functionality is blocked by at least one C1-C2 bond. 10 Alkyl, preferably C1-C6 alkyl, preferably C4 alkyl, preferably tert-butyl substituted.

[0126] Amination compounds are another class of available antioxidant additives, which may optionally be combined with phenolic antioxidant additives. Examples of amination compounds are aromatic amines, such as NR. 10 R 11 R 12 Aromatic amines, of which R 10 R represents an optionally substituted aliphatic or aromatic group. 11 R represents an optionally substituted aromatic group. 12 Represents a hydrogen atom, alkyl group, aryl group, or formula R 13 S(O) z R 14 The group, wherein R 13 Indicates alkylene or alkenylene, R 14 represents alkyl, alkenyl, or aryl, while z represents 0, 1, or 2.

[0127] The additive packages and / or lubricating compositions according to the present invention may contain all types of antioxidant additives known to those skilled in the art.

[0128] According to this embodiment, preferably, the additive package contains 1 to 40% by weight of antioxidant, preferably 2 to 30% by weight, more preferably 5 to 25% by weight of antioxidant, relative to the total weight of the additive package.

[0129] These other functional additives (different from the phosphite additive, different from the thiadiazole additive, and different from the thiophosphate additive) can be added to the lubricating composition according to the invention via the additive package according to the invention, or they can be added directly to the lubricating composition according to the invention alone.

[0130] According to one embodiment, the additive package comprises: - at least one phosphite compound of formula (1), and - At least one thiadiazole compound corresponding to one of formulas (2), (3), (4), or (5), - At least one borate dispersant, [Chemical Formula 1]

[0131] [Chemical Formula 2]

[0132] [Chemical Formula 3]

[0133] [Chemical Formula 4]

[0134] [Chemical Formula 5]

[0135] in: R and R 1 Each of the following can independently represent a hydrogen atom, or a straight-chain or branched, saturated or unsaturated hydrocarbon group comprising 1 to 24 carbon atoms, wherein the hydrocarbon group optionally includes one or more heteroatoms. R 2 and R 3 Each of the following can independently represent a hydrogen atom, or a straight-chain or branched, saturated or unsaturated hydrocarbon group comprising 1 to 24 carbon atoms, wherein the hydrocarbon group optionally includes one or more heteroatoms. The additive package further comprises at least one compound selected from: (i) thiophosphate compounds, (ii) phosphate compounds corresponding to formula (7), and (iii) mixtures thereof. [Chemical Formula 7]

[0136] in: R 7 and R 8 The two groups are independently selected from: hydrogen atoms, or straight-chain or branched, saturated or unsaturated hydrocarbon groups containing 4 to 24 carbon atoms, and two R groups. 7 Or R 8 At least one of them is a straight-chain or branched, saturated or unsaturated hydrocarbon group containing 4 to 24 carbon atoms.

[0137] According to this embodiment, advantageously, when one or more thiophosphate compounds are present, the mass ratio between the thiadiazole compound and the thiophosphate compound ranges from 1 / 5 to 2 / 1, preferably from 1 / 2 to 1.5 / 1.

[0138] According to one embodiment of the present invention, the additive package comprises: - At least 0.5% by weight, preferably 0.5 to 20% by weight, more preferably 1 to 10% by weight, or even 2 to 5% by weight of a phosphite compound of formula (1), - At least 1% by weight, preferably 1 to 20% by weight, more preferably 2 to 15% by weight, or even 3 to 10% by weight of a thiadiazole compound, preferably a thiadiazole compound corresponding to formula (2), - Optionally 1 to 20% by weight, preferably 2 to 15% by weight, of compounds selected from: (i) thiophosphate compounds, preferably thiophosphate compounds of formula (6), (ii) phosphate compounds, preferably phosphate compounds corresponding to formula (7), and (iii) mixtures thereof. - Optionally up to 100% by weight of base oil and / or additives other than phosphites, thiadiazoles, phosphates, and thiophosphates. It is understood that if the additive package further comprises a thiophosphate compound, the mass ratio between the thiadiazole compound and the thiophosphate compound ranges from 1 / 5 to 2 / 1. Relative to the total weight of the additive package.

[0139] According to one embodiment of the present invention, the additive package comprises: - 2 to 5% by weight of the phosphite compound of formula (1), - 3 to 10% by weight of a thiadiazole compound, preferably corresponding to a thiadiazole compound of formula (2), - Optionally 2 to 15% by weight of compounds selected from: (i) thiophosphate compounds, preferably thiophosphate compounds corresponding to formula (6), (ii) phosphate compounds, preferably phosphate compounds corresponding to formula (7), and (iii) mixtures thereof. - Optionally up to 100% by weight of base oil and / or additives other than phosphites, thiadiazoles, phosphates, and thiophosphates. It is understood that if the additive package further comprises a thiophosphate compound, the mass ratio between the thiadiazole compound and the thiophosphate compound ranges from 1 / 5 to 2 / 1. Relative to the total weight of the additive package.

[0140] According to one embodiment of the present invention, the additive package comprises: - At least 0.5% by weight, preferably 0.5 to 20% by weight, more preferably 1 to 10% by weight, or even 2 to 5% by weight of a phosphite compound of formula (1), wherein R and R 1 The alkyl group is a straight-chain or branched alkyl group, having 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, and more preferably 2 to 8 carbon atoms. - At least 1% by weight, preferably 1 to 20% by weight, more preferably 2 to 15% by weight, or even 3 to 10% by weight of a thiadiazole compound, preferably a thiadiazole compound corresponding to formula (2), - Optionally 1 to 20% by weight, preferably 2 to 15% by weight, of compounds selected from: (i) thiophosphate compounds, preferably thiophosphate compounds of formula (6), (ii) phosphate compounds, preferably phosphate compounds corresponding to formula (7), and (iii) mixtures thereof. - Optionally up to 100% by weight of base oil and / or additives other than phosphites, thiadiazoles, phosphates, and thiophosphates. Relative to the total weight of the additive package.

[0141] According to one embodiment of the present invention, the additive package comprises: - At least 0.5% by weight, preferably 0.5 to 20% by weight, more preferably 1 to 10% by weight, or even 2 to 5% by weight of a phosphite compound of formula (1), - At least 1% by weight, preferably 1 to 20% by weight, more preferably 2 to 15% by weight, or even 3 to 10% by weight of a thiadiazole compound, preferably a thiadiazole compound corresponding to formula (2), - Optionally 1 to 20% by weight, preferably 2 to 15% by weight, of compounds selected from: (i) thiophosphate compounds, preferably thiophosphate compounds corresponding to formula (6), (ii) phosphate compounds, preferably phosphate compounds corresponding to formula (7), and (iii) mixtures thereof. - Optionally 5 to 80% by weight of a dispersant, preferably 10 to 70% by weight of a dispersant, more preferably 20 to 60% by weight of a dispersant, preferably at least one of the dispersants being a borate dispersant. - Optionally up to 100% by weight of base oil and / or additives different from the phosphites, thiadiazoles, thiophosphates, phosphates, and dispersant additives, Relative to the total weight of the additive package.

[0142] According to one embodiment of the present invention, the additive package comprises: - 2 to 5% by weight of the phosphite compound of formula (1), - 3 to 10% by weight of a thiadiazole compound, preferably corresponding to a thiadiazole compound of formula (2), - 2 to 15% by weight of compounds selected from: (i) thiophosphate compounds, preferably thiophosphate compounds corresponding to formula (6), (ii) phosphate compounds, preferably phosphate compounds corresponding to formula (7), and (iii) mixtures thereof. - Optionally 20 to 60% by weight of a dispersant, preferably at least one of which is a borate dispersant. - Optionally up to 100% by weight of base oil and / or additives different from the phosphites, thiadiazoles, thiophosphates, phosphates, and dispersant additives, Relative to the total weight of the additive package.

[0143] According to one embodiment of the present invention, the additive package comprises: - At least 0.5% by weight, preferably 0.5 to 20% by weight, more preferably 1 to 10% by weight, or even 2 to 5% by weight of a phosphite compound of formula (1), - At least 1% by weight, preferably 1 to 20% by weight, more preferably 2 to 15% by weight, or even 3 to 10% by weight of a thiadiazole compound, preferably a thiadiazole compound corresponding to formula (2), - 1 to 20% by weight, preferably 2 to 15% by weight, of compounds selected from: (i) thiophosphate compounds corresponding to formula (6), wherein R 4 Indicates the group SR 4a , where R 4a Represents group R 4b COOH, where R 4b The terms refer to straight-chain or branched alkyl groups comprising 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, more preferably 2 to 8 carbon atoms; (ii) phosphate ester compounds, preferably corresponding to phosphate ester compounds of formula (7); and (iii) mixtures thereof. - Optionally 5 to 80% by weight of a dispersant, preferably 10 to 70% by weight of a dispersant, more preferably 20 to 60% by weight of a dispersant, preferably at least one of the dispersants being a borate dispersant. - Optionally up to 100% by weight of base oil and / or additives different from the phosphites, thiadiazoles, thiophosphates, phosphates, and dispersant additives, Relative to the total weight of the additive package.

[0144] This embodiment is particularly advantageous when the additive package is used in the lubrication composition itself used in electric vehicles.

[0145] According to one embodiment of the present invention, the additive package comprises: - 2 to 5% by weight of the phosphite compound of formula (1), - 3 to 10% by weight of a thiadiazole compound, preferably corresponding to a thiadiazole compound of formula (2), - 2 to 15% by weight of compounds selected from: (i) thiophosphate compounds, preferably thiophosphate compounds corresponding to formula (6), (ii) phosphate compounds, preferably phosphate compounds corresponding to formula (7), and (iii) mixtures thereof. - 20 to 60% by weight of a dispersant, preferably at least one of which is a borate dispersant. - Optionally up to 100% by weight of base oil and / or additives different from the phosphites, thiadiazoles, thiophosphates, phosphates, and dispersant additives, Relative to the total weight of the additive package.

[0146] According to one embodiment of the present invention, the additive package comprises: - 2 to 5% by weight of the phosphite compound of formula (1), - 3 to 10% by weight of a thiadiazole compound, preferably corresponding to a thiadiazole compound of formula (2), - 2 to 15% by weight of compounds selected from: (i) thiophosphate compounds, preferably thiophosphate compounds corresponding to formula (6), (ii) phosphate compounds corresponding to formula (7), and (iii) mixtures thereof. - 20 to 60% by weight of a dispersant, preferably at least one of which is a borate dispersant. - Optionally up to 100% by weight of base oil and / or additives different from the phosphites, thiadiazoles, thiophosphates, phosphates, and dispersant additives, Relative to the total weight of the additive package.

[0147] According to one embodiment of the present invention, the additive package comprises: - At least 0.5% by weight, preferably 0.5 to 20% by weight, more preferably 1 to 10% by weight, or even 2 to 5% by weight of a phosphite compound of formula (1), - At least 1% by weight, preferably 1 to 20% by weight, more preferably 2 to 15% by weight, or even 3 to 10% by weight of a thiadiazole compound, preferably a thiadiazole compound corresponding to formula (2), - Optionally 1 to 20% by weight, preferably 2 to 15% by weight, of compounds selected from: (i) thiophosphate compounds, preferably thiophosphate compounds corresponding to formula (6), (ii) phosphate compounds, preferably phosphate compounds corresponding to formula (7), and (iii) mixtures thereof. - Optionally 5 to 80% by weight of a dispersant, preferably 10 to 70% by weight of a dispersant, more preferably 20 to 60% by weight of a dispersant, preferably at least one of the dispersants being a borate dispersant. - Optionally up to 100% by weight of base oil and / or additives different from the phosphites, thiadiazoles, thiophosphates, phosphates, and dispersant additives, Relative to the total weight of the additive package.

[0148] According to one embodiment of the present invention, the additive package comprises: - At least 0.5% by weight, preferably 0.5 to 20% by weight, more preferably 1 to 10% by weight, or even 2 to 5% by weight of a phosphite compound of formula (1), wherein R and R 1 Each of the above can independently represent a hydrogen atom, or include straight-chain or branched alkyl groups comprising 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, more preferably 2 to 8 carbon atoms. - At least 1% by weight, preferably 1 to 20% by weight, more preferably 2 to 15% by weight, or even 3 to 10% by weight of a thiadiazole compound, wherein at least one corresponds to formula (2), - 1 to 20% by weight, preferably 2 to 15% by weight, preferably 3 to 10% by weight, of compounds selected from: (i) thiophosphate compounds corresponding to formula (6), (ii) phosphate compounds corresponding to formula (7), and (iii) mixtures thereof, wherein the compounds are preferably selected from (i) thiophosphate compounds corresponding to formula (6). - Optionally 5 to 80% by weight of a dispersant, preferably 10 to 70% by weight of a dispersant, more preferably 20 to 60% by weight of a dispersant, preferably at least one of the dispersants being a borate dispersant. - Optionally up to 100% by weight of base oil and / or additives different from the phosphites, thiadiazoles, thiophosphates, phosphates, and dispersant additives, Relative to the total weight of the additive package, It is understood that if the additive package contains a thiophosphate compound, the mass ratio between the thiadiazole compound and the thiophosphate compound is in the range of 1 / 5 to 2 / 1, preferably 1 / 2 to 1.5 / 1.

[0149] Preferably, the additive package according to the invention contains 4,000 to 30,000 ppm by weight of sulfur, preferably 5,000 to 15,000 ppm by weight of sulfur.

[0150] Preferably, the additive package according to the invention contains 6,000 to 40,000 ppm by weight of phosphorus, preferably 10,000 to 30,000 ppm by weight of phosphorus.

[0151] Preferably, the additive package according to the invention does not contain zinc-containing anti-wear additives.

[0152] Preferably, the additive package according to the invention does not contain sulfonate / ester detergents, or phenolate / ester detergents, or salicylate / ester detergents.

[0153] Preferably, the additive package according to the invention does not contain phosphorus-containing compounds different from those corresponding to formulas (1) and (7).

[0154] The phosphite compound of formula (1), and the thiadiazole compound of formulas (2), (3), (4), and / or (5) provide sulfur and / or phosphorus for the additive package according to the invention. Preferably, the phosphite compound of formula (1) provides phosphorus but not sulfur, while the thiadiazole compound of formulas (2), (3), (4), and / or (5) provides sulfur but not phosphorus.

[0155] Advantageously, the mass ratio of sulfur content to phosphorus content provided by the phosphite compound of formula (1) and the thiadiazole compound ranges from 1 / 1 to 3.5 / 1. Preferably, the mass ratio of sulfur content provided by the thiadiazole compound of formula (2), (3), (4), and / or (5) to phosphorus content provided by the phosphite compound of formula (1) ranges from 1 / 1 to 3.5 / 1.

[0156] The present invention relates to lubricating compositions obtained by mixing an additive package according to the invention with at least one base oil and one or more functional additives, optionally typically different from the additives in the additive package.

[0157] The base oil used to obtain the lubricating composition according to the invention may be the same as or different from the base oil optionally present in the additive package.

[0158] Therefore, the present invention relates to a lubricating composition comprising the following: - At least 60% by weight of base oil, relative to the total weight of the lubricating composition. - at least one phosphite compound of formula (1), and - At least one thiadiazole compound corresponding to one of formulas (2), (3), (4), or (5).

[0159] The compounds of formulas (1), (2), (3), (4), and (5) are as defined within the additive package framework and preferably have one or more of the advantageous properties defined within the additive package framework.

[0160] The base oil is as defined within the additive package framework and may have one or more of the advantageous properties defined within the additive package framework.

[0161] According to one embodiment, the lubricating composition according to the invention comprises, or even consists of, the following: - 80 to 99.5% by weight, preferably 85 to 99% by weight of base oil, - 0.5 to 20% by weight, preferably 1 to 15% by weight, of the additive packet according to the invention. Relative to the total weight of the lubricating composition.

[0162] According to one embodiment, the lubricating composition according to the invention further comprises: (i) at least one thiophosphate compound, preferably corresponding to a thiophosphate compound of formula (6), and / or (ii) at least one phosphate compound, preferably corresponding to a phosphate compound of formula (7).

[0163] The compound of formula (6) is as defined in the additive package framework and preferably has one or more of the advantageous properties defined in the additive package framework.

[0164] When the lubricating composition contains a thiophosphate compound, the mass ratio between the amounts of the thiadiazole compound and the thiophosphate compound ranges from 1 / 5 to 2 / 1, preferably from 1 / 2 to 1.5 / 1.

[0165] The compound of formula (7) is as defined in the additive package framework and preferably has one or more of the advantageous properties defined in the additive package framework.

[0166] Preferably, the lubricating composition according to the invention comprises, or even consists of, the following: - 70 to 99% by weight, preferably 85 to 99% by weight of base oil, - 0.01 to 5% by weight, preferably 0.05 to 1% by weight, of a phosphite compound. - 0.01 to 5% by weight, preferably 0.05 to 1% by weight, of a thiadiazole compound. - Optionally 0.01 to 5% by weight, preferably 0.05 to 1% by weight, of compounds selected from: (i) thiophosphate compounds, preferably thiophosphate compounds of formula (6), (ii) phosphate compounds, preferably phosphate compounds corresponding to formula (7), and (iii) mixtures thereof. - Optionally up to 100% by weight of an additive different from the aforementioned phosphites, thiadiazoles, and thiophosphates. Relative to the total weight of the lubricating composition, If the lubricating composition comprises (i) a thiophosphate compound, the mass ratio between the thiadiazole compound and the thiophosphate compound is in the range of 1 / 5 to 2 / 1, preferably 1 / 2 to 1.5 / 1.

[0167] Preferably, the lubricating composition according to the invention comprises, or even consists of, the following: - 70 to 99% by weight, preferably 85 to 99% by weight of base oil, - 0.01 to 5% by weight, preferably 0.05 to 1% by weight, of a phosphite compound of formula (1), wherein R and R 1 The alkyl group is a straight-chain or branched alkyl group, having 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, and more preferably 2 to 8 carbon atoms. - 0.01 to 5% by weight, preferably 0.05 to 1% by weight, of a thiadiazole compound. - Optionally 0.01 to 5% by weight, preferably 0.05 to 1% by weight, of compounds selected from: (i) thiophosphate compounds, preferably thiophosphate compounds corresponding to formula (6), (ii) phosphate compounds, preferably phosphate compounds corresponding to formula (7), and (iii) mixtures thereof. - Optionally up to 100% by weight of an additive different from the aforementioned phosphites, thiadiazoles, and thiophosphates. Relative to the total weight of the lubricating composition, If the lubricating composition comprises (i) a thiophosphate compound, the mass ratio between the thiadiazole compound and the thiophosphate compound is in the range of 1 / 5 to 2 / 1, preferably 1 / 2 to 1.5 / 1.

[0168] Preferably, the lubricating composition according to the invention comprises, or even consists of, the following: - 70 to 99% by weight, preferably 85 to 99% by weight of base oil, - 0.01 to 5% by weight, preferably 0.05 to 1% by weight, of a phosphite compound. - 0.01 to 5% by weight, preferably 0.05 to 1% by weight, of a thiadiazole compound. - 0.01 to 5% by weight, preferably 0.05 to 1% by weight, of compounds selected from: (i) thiophosphate compounds, preferably thiophosphate compounds corresponding to formula (6), (ii) phosphate compounds, preferably phosphate compounds corresponding to formula (7), and (iii) mixtures thereof. - Optionally up to 100% by weight of an additive different from the aforementioned phosphites, thiadiazoles, phosphates, and thiophosphates. Relative to the total weight of the lubricating composition, If the lubricating composition comprises (i) a thiophosphate compound, the mass ratio between the thiadiazole compound and the thiophosphate compound is in the range of 1 / 5 to 2 / 1, preferably 1 / 2 to 1.5 / 1.

[0169] According to one embodiment, the lubricating composition according to the invention further comprises: at least one dispersant, preferably a borate dispersant, more preferably selected from borate succinimide, and even more preferably selected from borate polyisobutylene succinimide.

[0170] According to one embodiment, the lubricating composition according to the invention comprises, or even consists of, the following: - 70 to 99% by weight, preferably 85 to 99% by weight of base oil, - 0.01 to 5% by weight, preferably 0.05 to 1% by weight, of a phosphite compound. - 0.01 to 5% by weight, preferably 0.05 to 1% by weight, of a thiadiazole compound. - Optionally 0.01 to 5% by weight, preferably 0.05 to 1% by weight, of compounds selected from: (i) thiophosphate compounds, preferably thiophosphate compounds corresponding to formula (6), (ii) phosphate compounds, preferably phosphate compounds corresponding to formula (7), and (iii) mixtures thereof. - Optionally 1 to 20% by weight of a dispersant, preferably 1 to 15% by weight, more preferably 2 to 10% by weight of a dispersant. - Optionally up to 100% by weight of base oil and / or additives different from the phosphites, thiadiazoles, thiophosphates, phosphates, and dispersant additives, Relative to the total weight of the lubricating composition, If the lubricating composition comprises (i) a thiophosphate compound, the mass ratio between the thiadiazole compound and the thiophosphate compound is in the range of 1 / 5 to 2 / 1, preferably 1 / 2 to 1.5 / 1.

[0171] According to one embodiment, the lubricating composition according to the invention further comprises at least one antioxidant. The lubricating composition according to the invention may contain 0.2 to 2% by weight, preferably 0.3 to 1% by weight, of an antioxidant additive relative to the total weight of the composition.

[0172] The lubricating composition according to the invention may further comprise at least one viscosity index improver (VI improver). Examples of VI improvers include polymethacrylate, polyisobutylene, or fatty acid esters. The viscosity index improver additive may comprise 0.01 to 10% by weight, or even 0.05 to 5% by weight, of the total weight of the lubricating composition.

[0173] The lubricating composition according to the invention may further comprise at least one defoamer. The defoamer may be selected from silicone. The lubricating composition according to the invention may comprise 0.01 to 5% by weight, preferably 0.1 to 1.5% by weight, or even 0.1 to 2% by weight, of the defoamer relative to the total weight of the composition.

[0174] According to one embodiment, the lubricating composition according to the invention comprises, or even consists of, the following: - 70 to 99% by weight, preferably 85 to 99% by weight of base oil, - 0.01 to 5% by weight, preferably 0.05 to 1% by weight, of a phosphite compound. - 0.01 to 5% by weight, preferably 0.05 to 1% by weight, of a thiadiazole compound. - 0.01 to 5% by weight, preferably 0.05 to 1% by weight, of compounds selected from: (i) thiophosphate compounds, preferably thiophosphate compounds corresponding to formula (6), (ii) phosphate compounds, preferably phosphate compounds corresponding to formula (7), and (iii) mixtures thereof. - 1 to 15% by weight, more preferably 2 to 10% by weight of dispersant, - Optionally 0.2 to 2% by weight, preferably 0.3 to 1% by weight of antioxidant additives, - Optionally 0.01 to 5% by weight, preferably 0.1 to 1.5% by weight of defoaming additive, - Optionally 0.01 to 10% by weight, or even 0.05 to 5% by weight, of a viscosity index improver. Relative to the total weight of the lubricating composition, If the lubricating composition comprises (i) a thiophosphate compound, the mass ratio between the thiadiazole compound and the thiophosphate compound is in the range of 1 / 5 to 2 / 1, preferably 1 / 2 to 1.5 / 1.

[0175] According to one embodiment, the lubricating composition according to the invention comprises, or even consists of, the following: - 70 to 99% by weight, preferably 85 to 99% by weight of base oil, - 0.01 to 5% by weight, preferably 0.05 to 1% by weight, of a phosphite compound. - 0.01 to 5% by weight, preferably 0.05 to 1% by weight, of a thiadiazole compound. - 0.01 to 5% by weight, preferably 0.05 to 1% by weight, of compounds selected from: (i) thiophosphate compounds corresponding to formula (6), (ii) phosphate compounds corresponding to formula (7), and (iii) mixtures thereof, wherein the compounds are preferably selected from (i) thiophosphate compounds corresponding to formula (6). - 1 to 15% by weight, more preferably 2 to 10% by weight of dispersant, - Optionally 0.2 to 2% by weight, preferably 0.3 to 1% by weight of antioxidant additives, - Optionally 0.01 to 5% by weight, preferably 0.1 to 1.5% by weight of defoaming additive, - Optionally 0.01 to 10% by weight, or even 0.05 to 5% by weight, of a viscosity index improver. Relative to the total weight of the lubricating composition, If the lubricating composition comprises (i) a thiophosphate compound, the mass ratio between the thiadiazole compound and the thiophosphate compound is in the range of 1 / 5 to 2 / 1, preferably 1 / 2 to 1.5 / 1.

[0176] Preferably, the thiophosphate compound provides 100 to 1,000 ppm by weight of sulfur, preferably 150 to 700 ppm by weight, for the lubricating composition according to the invention.

[0177] Preferably, the thiadiazole compounds of formulas (2), (3), (4), and / or (5) provide 100 to 3,000 ppm by weight of sulfur, preferably 200 to 2,000 ppm by weight, for the lubricating composition according to the invention.

[0178] Preferably, the phosphite compound of formula (1) provides 100 to 1,000 ppm by weight of phosphorus, preferably 120 to 500 ppm by weight, for the lubricating composition according to the invention.

[0179] Preferably, the lubricating composition according to the invention contains 200 to 4,000 ppm by weight of sulfur, preferably 350 to 2,700 ppm by weight of sulfur.

[0180] Preferably, the lubricating composition according to the invention contains 100 to 1,200 ppm by weight of phosphorus, preferably 120 to 1,000 ppm by weight of phosphorus.

[0181] Preferably, the lubricating composition according to the invention does not contain zinc-containing anti-wear additives.

[0182] Preferably, the lubricating composition according to the invention does not contain sulfonate / ester detergents, or phenolate / ester detergents, or salicylate / ester detergents.

[0183] Preferably, the lubricating composition according to the invention does not contain phosphorus-containing compounds other than those corresponding to formulas (1) and (7).

[0184] Advantageously, the kinematic viscosity of the lubricating composition according to the invention is in the range of 5 to 300 mm. 2 / s, preferably 10 to 30 mm 2 / s, more preferably 15 to 25 mm² / s, wherein the kinematic viscosity is measured according to ASTM D445 at 40°C.

[0185] Advantageously, the kinematic viscosity of the lubricating composition according to the invention is in the range of 1 to 20 mm. 2 / s, preferably 1.5 to 15 mm 2 / s, more preferably 2 to 10 mm 2 / s, the kinematic viscosity is measured at 100°C according to ASTM D445.

[0186] The subject matter of this invention also includes the use of the additive package according to the invention for formulating lubricating compositions intended to lubricate transmissions, particularly transmission gears, in motor vehicles. The transmission may be a manual transmission or an automatic transmission.

[0187] The additive package defined in this invention enables the improvement of the corrosion resistance properties of lubricating compositions containing the additive package, particularly for copper.

[0188] Additive packages as defined in this invention also enable improvements in the durability of lubricating compositions containing said additive packages.

[0189] In fact, when the lubricating composition is used in a transmission, combining the phosphite additive of formula (1) with the thiadiazole additive of formulas (2), (3), (4) and / or (5) unexpectedly improves corrosion resistance and durability.

[0190] The subject matter of this invention also includes the use of the lubricating composition according to the invention for lubricating motor vehicle transmissions, particularly transmission gears. The transmission may be a manual transmission or an automatic transmission.

[0191] Preferably, the lubricating composition according to the invention is used to reduce wear on mechanical components of a motor vehicle transmission, particularly on gears. Therefore, according to this embodiment, the lubricating composition according to the invention reduces wear on transmission gears.

[0192] Preferably, the lubricating composition according to the invention is used to reduce pitting of mechanical components of motor vehicle transmissions, particularly motor vehicle gears.

[0193] According to an advantageous embodiment, the lubricating composition according to the invention is used to reduce both wear on mechanical components (especially gears) of a motor vehicle transmission and pitting on mechanical components (especially gears) of a motor vehicle transmission.

[0194] Preferably, the lubricating composition according to the invention is used in electric vehicles.

[0195] According to another aspect, the present invention further relates to a method for lubricating at least one motor vehicle transmission component, particularly a motor vehicle gear, the method comprising at least one step of contacting at least the component with a lubricating composition according to the present invention.

[0196] According to another aspect, the present invention further relates to a method for improving the anti-corrosion properties of a lubricating composition, the method comprising the steps of: mixing at least one phosphite additive of formula (1) as defined in the present invention with at least one thiadiazole additive as defined in the present invention; preferably, the additive is further mixed with a thiophosphate additive.

[0197] The properties and preferences described for all lubricating compositions according to the invention also apply to these methods.

[0198] According to the invention, the particular, advantageous, or preferred properties of the composition according to the invention make it possible to define the use according to the invention, which is also particularly, advantageous, or preferred.

[0199] The present invention will now be described by way of the following embodiments, which are of course illustrative and not limiting of the invention.

[0200] Example

[0201] Example 1: Preparation of Additive Package

[0202] The additive package is prepared by mixing the components at a temperature of about 40°C according to methods known to those skilled in the art.

[0203] Table 2 shows the weight proportions of the components in the tested additive packages.

[0204] [Table 2]

[0205] in: - The phosphite compound is dibutylhydrophosphite. - The thiadiazole compound comprises a mixture of thiadiazole compounds corresponding to formula (2), wherein R 2 and R 3 Independently represented by: a hydrogen atom, a straight-chain or branched alkyl group comprising 6 to 18 carbon atoms, and a group -SR', wherein R' may be a straight-chain or branched alkyl group comprising 6 to 18 carbon atoms. It is understood that, in each thiadiazole compound, R... 2 and R 3 Not all of them are hydrogen atoms. - The thiophosphate compound corresponds to formula (6), where X is a sulfur atom; R 5 and R 6 Independently represented by: a hydrogen atom, or a straight-chain or branched alkyl group comprising 2 to 8 carbon atoms; R 4 Indicates the group SR 4a , where R 4a Represents group R 4b COOH, where R 4b This indicates a straight-chain or branched alkyl group consisting of 2 to 8 carbon atoms; - The phosphate compound is an acid phosphate, corresponding to formula (7), wherein R 7 and R 8 They are independently selected from: hydrogen atoms or straight-chain or branched, saturated or unsaturated aliphatic groups containing 8 to 20 carbon atoms. - The dispersant compound is borate-modified PIBSI. - The corrosion inhibitor is a triazole derivative. - The base oil is a Group III base oil with a viscosity of approximately 4 cSt at 100°C.

[0206] Example 2: Preparation of a lubricating composition

[0207] A lubricating composition was prepared by mixing the additive package defined in Example 1 with a base oil and additives at a temperature of about 40°C, according to methods well known to those skilled in the art.

[0208] Table 3 shows the weight percentages (%) of the components of the tested lubricating composition, as well as the properties of the additive packages used.

[0209] [Table 3]

[0210] The additives are selected from defoamers and viscosity index improvers.

[0211] The elemental contents of phosphorus and sulfur were determined by inductively coupled plasma spectroscopy (“ICP”) and are shown in ppm by weight in Table 3.

[0212] The viscosity of the tested lubricating composition at 100°C was approximately 4.5 cSt, as measured according to ASTM D445.

[0213] Example 3: Research on Lubricating Compositions

[0214] The corrosion resistance properties of the lubricating composition are as described in Table 3 of ASTM D130, modified as follows: - The lubricating composition is suitable for temperatures up to 150°C. - The test lasted for 168 hours. - Weigh the copper strip before and after the test. - At the end of the test, perform an ICP measurement of the copper content in the lubricating composition.

[0215] These operating conditions correspond to greater constraints on lubricating compositions for electric vehicle applications.

[0216] Table 4 shows the quality difference (Δ mass) before and after the test.

[0217] [Table 4]

[0218] The compositions according to the present invention also demonstrate very low mass difference in the copper strips, indicating excellent corrosion resistance. Compositions CI1 to CI4 further exhibit superior corrosion resistance compared to composition CI5, which has a mass ratio of 3 / 1 between a thiadiazole compound and a thiophosphate compound.

[0219] Furthermore, the compositions according to the invention exhibit very good load-bearing capacity. In particular, compositions CI1 to CI5 show values ​​of at least 7 in the FZG A10 / 16.6R / 90 test. These load-bearing capacity (FZG) values ​​indicate that the lubricating compositions have very good durability, especially for use in transmissions.

[0220] The additive package as defined in this invention enables improvements in the performance of the lubricating composition. More specifically, the lubricating composition according to the invention, comprising the additive package according to the invention, exhibits improved corrosion resistance and durability.

Claims

1. An additive package, said additive package comprising: - at least one phosphite compound of formula (1), and - At least one thiadiazole compound corresponding to one of formulas (2), (3), (4) or (5), [Chemical Formula 1] [Chemical Formula 2] [Chemical Formula 3] [Chemical Formula 4] [Chemical Formula 5] in: R and R 1 Each of the following can independently represent a hydrogen atom, or a straight-chain or branched, saturated or unsaturated hydrocarbon group comprising 1 to 24 carbon atoms, wherein the hydrocarbon group optionally includes one or more heteroatoms. R 2 and R 3 Each of the above can represent a hydrogen atom independently, or a straight-chain or branched, saturated or unsaturated hydrocarbon group comprising 1 to 24 carbon atoms, wherein the hydrocarbon group optionally includes one or more heteroatoms.

2. The additive package according to claim 1, wherein the mass ratio between the phosphite compound of formula (1) and the thiadiazole compound ranges from 1 / 10 to 10 / 1, preferably from 1 / 5 to 5 / 1, and more preferably from 1 / 2 to 2 / 1.

3. The additive package according to claim 1 or 2, wherein the additive package further comprises: - At least one borate dispersant, and - At least one compound selected from: (i) thiophosphate compounds, (ii) phosphate compounds corresponding to formula (7), and (iii) mixtures thereof, [Chemical Formula 7] in: R 7 and R 8 The two groups are independently selected from: hydrogen atoms, or straight-chain or branched, saturated or unsaturated hydrocarbon groups containing 4 to 24 carbon atoms, and two R groups. 7 Or R 8 At least one of them is a straight-chain or branched, saturated or unsaturated hydrocarbon group containing 4 to 24 carbon atoms. It is understood that if one or more thiophosphate compounds are present, the mass ratio between the thiadiazole compound and the thiophosphate compound is preferably from 1 / 5 to 2 / 1, and more preferably from 1 / 2 to 1.5 / 1.

4. The additive package according to any one of claims 1 to 3, wherein the additive package further comprises: at least one dispersant, preferably a borate dispersant, more preferably a borate dispersant selected from: borate succinimide, more preferably borate polyisobutylene succinimide, wherein the at least one dispersant preferably accounts for 10 to 70% by weight of the total weight of the additive package, more preferably 20 to 60% by weight.

5. The additive package according to any one of claims 1 to 4, wherein the mass ratio between the sulfur content and the phosphorus content provided by the phosphite compound of formula (1) and the thiadiazole compound ranges from 1 / 1 to 3.5 / 1.

6. The additive package according to any one of claims 1 to 5, wherein: - R and R 1 Each of the terms represents a hydrogen atom or a straight-chain or branched alkyl group, wherein the alkyl group comprises 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, more preferably 2 to 8 carbon atoms, and preferably R and R 1 The alkyl group refers to a straight-chain or branched alkyl group, wherein the alkyl group has 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, and more preferably 2 to 8 carbon atoms. and / or - The at least one thiadiazole compound corresponds to formula (2), wherein R 2 and R 3 The groups -SR' represent hydrogen atoms independently of each other, including straight-chain or branched alkyl groups comprising 6 to 18 carbon atoms, wherein R' may be a straight-chain or branched alkyl group comprising 6 to 18 carbon atoms.

7. The additive package according to any one of claims 1 to 6, wherein the additive package further comprises: at least one thiophosphate compound, wherein the mass ratio between the thiadiazole compound and the thiophosphate compound ranges from 1 / 5 to 2 / 1, preferably from 1 / 2 to 1.5 / 1, and preferably the at least one thiophosphate compound corresponds to formula (6): [Chemical Formula 6] in: R 5 and R 6 Each of the following can independently represent a hydrogen atom, or a straight-chain or branched, saturated or unsaturated hydrocarbon group comprising 1 to 24 carbon atoms, wherein the hydrocarbon group optionally includes one or more heteroatoms. R 4 Represents the group OR 4a Or the SR group 4a , where R 4a This refers to a straight-chain or branched, saturated or unsaturated hydrocarbon group comprising 1 to 24 carbon atoms, wherein the hydrocarbon group optionally includes one or more heteroatoms. X represents a sulfur atom or an oxygen atom. The understanding is that if X represents an oxygen atom, then R 4 Indicates the group SR 4a , Preferably, wherein: - R 5 and R 6 Each of the above can independently represent a hydrogen atom, or a straight-chain or branched alkyl group, wherein the alkyl group comprises 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, more preferably 2 to 8 carbon atoms, and / or - X represents a sulfur atom, and / or - R 4 Indicates the group SR 4a , where R 4a Represents group R 4b COOH, where R 4b The alkyl group refers to a straight-chain or branched alkyl group, wherein the alkyl group comprises 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, and more preferably 2 to 8 carbon atoms. More preferably, wherein: - R 5 and R 6 Each of these can be represented independently as a hydrogen atom, or a straight-chain or branched alkyl group, wherein the alkyl group comprises 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, more preferably 2 to 8 carbon atoms, and - X represents a sulfur atom, and - R 4 Indicates the group SR 4a , where R 4a Represents group R 4b COOH, where R 4b The alkyl group is a straight-chain or branched alkyl group, which comprises 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, and more preferably 2 to 8 carbon atoms.

8. The additive package according to any one of claims 1 to 7, wherein the additive package further comprises at least one phosphate ester compound, preferably corresponding to a phosphate ester compound of formula (7): [Chemical Formula 7] in: R 7 and R 8 The two groups are independently selected from: hydrogen atoms, or straight-chain or branched, saturated or unsaturated hydrocarbon groups containing 4 to 24 carbon atoms, and two R groups. 7 Or R 8 At least one of them is a straight-chain or branched, saturated or unsaturated hydrocarbon group containing 4 to 24 carbon atoms.

9. The additive package according to any one of claims 1 to 8, wherein the additive package comprises: - At least 0.5% by weight, preferably 0.5 to 20% by weight, more preferably 1 to 10% by weight, or even 2 to 5% by weight of a phosphite compound of formula (1), - At least 1% by weight, preferably 1 to 20% by weight, more preferably 2 to 15% by weight, or even 3 to 10% by weight of a thiadiazole compound. - Optionally 1 to 20% by weight, preferably 2 to 15% by weight, preferably 3 to 10% by weight, of compounds selected from: (i) thiophosphate compounds, preferably thiophosphate compounds of formula (6), (ii) phosphate compounds, preferably phosphate compounds corresponding to formula (7), and (iii) mixtures thereof. - Optionally up to 100% by weight of base oil and / or additives other than phosphites, thiadiazoles, phosphates, and thiophosphates. Relative to the total weight of the additive package.

10. A lubricating composition comprising: - At least 60% by weight of base oil, relative to the total weight of the lubricating composition. - At least one additive package according to any one of claims 1 to 9.

11. The lubricating composition according to the preceding claim, wherein the lubricating composition comprises: - 80 to 99.5% by weight, preferably 85 to 99% by weight of base oil, - 0.5 to 20% by weight, preferably 1 to 15% by weight of the additive package, Relative to the total weight of the lubricating composition.

12. The lubricating composition according to claim 10 or 11, wherein the lubricating composition comprises: - 70 to 99% by weight, preferably 85 to 99% by weight of base oil, - 0.01 to 5% by weight, preferably 0.05 to 1% by weight, of a phosphite compound. - 0.01 to 5% by weight, preferably 0.05 to 1% by weight, of a thiadiazole compound. - Optionally 0.01 to 5% by weight, preferably 0.05 to 1% by weight, of compounds selected from: (i) thiophosphate compounds, preferably thiophosphate compounds corresponding to formula (6), (ii) phosphate compounds, preferably phosphate compounds corresponding to formula (7), and (iii) mixtures thereof. - Optionally 1 to 20% by weight of a dispersant, preferably 1 to 15% by weight, more preferably 2 to 10% by weight of a dispersant. - Optionally up to 100% by weight of an additive different from the aforementioned phosphites, thiadiazoles, thiophosphates, phosphates, and dispersant additives. Relative to the total weight of the lubricating composition.

13. The lubricating composition according to any one of claims 10 to 12, wherein the kinematic viscosity at 100°C is in the range of 1 to 20 mm. 2 / s, preferably 1.5 to 15 mm 2 / s, more preferably 2 to 10 mm 2 / s.

14. Use of the additive package according to any one of claims 1 to 9 for preparing a lubricating composition intended to lubricate at least one mechanical component of a motor vehicle. Preferably, the component is a transmission assembly, and / or Preferably, the motor vehicle is an electric vehicle.

15. Use of the lubricating composition according to any one of claims 10 to 13 for lubricating at least one mechanical component of a motor vehicle, Preferably, the component is a transmission assembly, and / or Preferably, the motor vehicle is an electric vehicle.

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