JPH09165590A - Functional fluid containing boronized epoxide, carboxyl solubilizing agent and calcium complex - Google Patents

Abstract

A multipurpose functional fluid which is comprised of a major amount of a hydrocarbon oil and a minor amount, sufficient to improve characteristics of the fluid of a novel additive. The aditive is comprised of a calcium salt complex, a group II metal dithiophosphate salt, a borated epoxide and a carboxylic solubilizer. The calcium salt is preferably in the form of an overbased calcium sulfonate salt, the antiwear agent is preferably in the form of a zinc dithiophosphate salt, the borated epoxide is preferably the reaction product of boric acid and a 16 carbon 1,2-epoxide and the carboxylic solubilizer is preferably in the form of a reaction product of an acylating agent containing a substituted hydrocarbyl-based substituent containing about 12 to 500 carbon atoms. Other components such as viscosity improvers and anti-foaming agent are generally present in the fluid. The resulting fluid has improved low temperature fluidity and filterability, improved EP/antiwear performance, excellent friction improving properties, antichatter capability as well as being capable of passing hydraulic/transmission tests, power steering and brake capacity tests. These features are maintained simultaneously without harming other desirable performance characteristics of the fluid. The EP/antiwear performance characteristics are maintained concurrently with the anticorrosion characteristics and transmission performance capabilities. The improved water tolerance is maintained concurrently with the improved EP performance characteristics.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a functional fluid, and more particularly to a functional fluid having a wide variety of various functional characteristics when used as a fluid for a tractor.

[0002]

BACKGROUND OF THE INVENTION Functional fluids are fluids for tractors, fluids for automatic transmissions, fluids for manual transmissions, hydraulic fluids, fluids for power steering, fluids for power transmission devices, and the ability to act in a variety of different functions. Including fluid with
It is a term that includes various fluids, but is not limited to these. Within each of these fluids are different types for different transmissions with different designs that require fluids with significantly different functional characteristics, such as fluids for automatic transmissions. It is noteworthy that the fluid of exists. One type of functional fluid is commonly known as a tractor fluid. This fluid can be used with various types of tractor devices to provide maneuverability for tractor transmissions, gears, bearings, hydraulics, power steering, mechanical power interruptions, and hydraulic brakes.

The constituents contained in a functional fluid, such as a tractor fluid, are such that the resulting final fluid composition provides all of the required properties required to pass various different types of tests. Must be carefully selected to do. In general, the tractor fluid must act as an oil lubricant, power transfer means and heat transfer means.

Tractor fluids have many important and unique properties that provide the ability to operate within a tractor device. Such characteristics include the ability to provide the proper friction characteristics to prevent squeaking of the oil brake, but at the same time provide the ability to act on the oil brake and provide power interruption.
(PTO) Provides clutch action. The tractor fluid is
It should provide sufficient abrasion resistance and extreme pressure properties and water resistance / filtration performance.

The extreme pressure (EP) characteristics of tractor fluids are that the fluid is a spiral bevel test and a straight spur gear test.
indicated by the ability to pass the eartest). The tractor fluid should provide sufficient oil brake capability, as well as pass the brake squeak test when using an oil disc brake consisting of bronze, a graphite composition and asbestos. The tractor fluid should exhibit friction holding capabilities for power shift transmission clutches, such as clutches including graphite and bronze clutches.

US Pat. No. 4,410,438 discloses a lubricant and liquid fuel composition containing a borated epoxide. The borated epoxides have been shown to be useful in fluids such as heat exchange fluids, transmission fluids and hydraulic fluids.

US Pat. No. 3,933,659 discloses a functional fluid for a lubricating oil composition containing a major amount of a lubricating viscosity oil and an effective amount of an additive. The additive is an effective amount of an alkaline succinimide, a group II metal salt of dihydrocarbyldithiophosphoric acid, a basic salt of a sulfurized alkylphenol and an alkaline earth metal, and a fatty acid ester, a fatty acid amide or a fatty acid amine, or a mixture thereof. Containing a component that is a mixture of. This patent
It has been shown that the lubricating composition is useful as a functional fluid in systems requiring fluid coupling, hydraulic fluid and / or lubrication of relatively moving parts. The lubricating composition has been shown to be useful as a functional fluid in automatic transmissions, especially in passenger car automatic transmissions.

US Pat. No. 4,116,877 discloses a sealswell additive that is compatible with elastomers. This additive can be used with automatic transmissions, power transmission fluids and hydraulic steering fluids. The fluid is a basic mineral lubricating oil, containing oil-soluble bis (hydrocarbyl) phosphite, and oil-soluble hydrocarbyl-substituted phenol, in which a specific weight ratio of phosphite and phenol is maintained. There is. The patent shows that inclusion of these particular additive compounds in the disclosed proportions improves the compatibility of the elastomer with the fluid.

European Patent Application Publication No. 113,199, 1984 7
Published on March 11 discloses not only a tractor hydraulic fluid containing thioethyl octadecenyl succinate, but also a tractor hydraulic fluid containing oleyl phosphite in a tractor lubricating hydraulic fluid.

British Patent No. 1,452,513, dated October 13, 1976, contains fatty acids and fatty acid amides in tractor wet braking systems that have been found to be effective in reducing noise over a wide temperature range. A lubricant composition is disclosed.

British Patent No. 1,440,261 discloses a composition for reducing noise in wet braking systems of tractors. The fluid contained a lubricating oil and a surfactant or dispersant mixed with stearic acid. The composition was shown to also contain an alkylene polyamine dispersant, calcium and barium sulfonate and phenol salts, antiwear-antioxidants, and oleic acid.

[0012]

SUMMARY OF THE INVENTION A first object of the present invention is to provide a functional fluid having a wide variety of different functional properties, especially when used as a tractor fluid.

Another object of the present invention is to provide a functional fluid capable of passing a wide variety of tests relating to properties of EP / antiwear agents such as water resistance, brake capacity and friction and filterability. Is.

Yet another object of the present invention is improved low temperature fluidity / filterability, EP / antiwear performance, friction improvement properties, wet brake squeak control, and hydraulic equipment, transmissions, power steering and brake applications. In the area of competence for action, it is to provide improved performance at the same time without compromising performance in other areas.

Yet another object is to improve performance with respect to EP / antiwear performance without having undesirable effects on corrosion testing and transmission performance.

Yet another object is to provide improved water resistance without limiting the performance of the EP, rather than including a surfactant.

Another object of the present invention relates to properties such as friction properties, cold flow properties, seal swell properties, defoaming properties, antioxidant properties, and EP protection as shown in spiral bevel and straight spur gear tests. It is to provide a functional fluid that can pass a wide variety of tests.

Another object is to provide sufficient power steering performance and at the same time to provide turbo hydra-matic (Turbo
Hydra-matic) Oxidation test (General Motor Company test)
Is to give sufficient transmission performance.

Another object is to provide the power-shift transmission clutch with sufficient friction retention and corrosion inhibition, especially with respect to the corrosion of yellow metal (ie, copper, brass, bronze), as well as improved EP performance and wet braking. It is to provide a fluid that provides adequate friction characteristics for squeak control and, at the same time, wet braking capability and power disengagement clutch capability.

A first object of the present invention is to provide a functional fluid which contains essential ingredients such that the fluid simultaneously provides various desirable properties.

These and other objects of the invention include:
It will be apparent to those of skill in the art upon reading this specification.

[0022]

Disclosed is a functional fluid, especially in the form of a tractor fluid. The functional fluid comprises a major amount of hydrocarbon oil and characteristics of the fluid (eg,
It contains small amounts of additives sufficient to improve the lubrication capacity, power transmission means capacity, and heat transfer means capacity).
This additive contains four essential ingredients, each present in an amount sufficient to improve the above-mentioned properties, in order to improve these properties or also to give the fluid more desirable properties. , May contain other ingredients. This additive is in the form of calcium salt, zinc salt of dithiophosphoric acid.
Inevitably contains EP / antiwear agents, borated epoxides, and carboxyl solubilizers. The carboxyl solubilizer is preferably in the form of an amine reaction product of an acylating agent containing a substituted hydrocarbyl-based substituent having about 12 to 500 carbon atoms. Additives and 4
The specific amounts and ranges for the two essential ingredients are described below. However, these amounts can vary, as the additives can be used in many different types of fluids. And again, it may vary slightly with other ingredients and the amount of that ingredient.

The inventors of the present invention are
There is some flexibility with respect to the amounts of each of the four essential ingredients, and generally with respect to the detailed definitions of each of these four ingredients, as described above, but the amount limitation is either completely ignored or the other ingredients are It has been discovered that no useful functional fluid is obtained when randomly substituted for these four essential components.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION The functional fluid of the present invention can be manufactured and sold in the form of a final product of the functional fluid, which can be included in various mechanical devices such as tractors. However, the functional fluids of the present invention are generally manufactured in the form of concentrates, which are subsequently substantially diluted in hydrocarbon oils to form the desired fluid. Concentrates are themselves composed of various components, sometimes these components themselves are contained in some type of oil, a diluent or "diluted" oil. It should be noted that with respect to the percentage of components, it is the parts by weight of the components present in the functional fluid. The parts by weight stated with respect to the amount of each component present in the functional fluid are parts by weight of the active chemical, not parts of the component that can be added in combination with the "diluting" oil.

The four essential components of the functional fluid of the present invention are: (1) a calcium salt; (2) an antiwear agent in the form of a Group II metal salt of dithiophosphoric acid; (3) boration. Epoxide; (4) Carboxyl solubilizer. Each of these four components, as well as the other components suitably present in the functional fluids of the present invention, will now be described in detail. It should be pointed out that not all of these components themselves are new compounds. However, the presence of these compounds in combination with each other provides new functional fluids that provide previously unattainable improved properties.

A wide variety of metal salts have been disclosed that neutralize the surface active or dispersant properties and undesirable acidic substances formed in the lubricating oil during operation of the engine in which the lubricating oil is contained. Shown as particularly valuable by ability. Such metal salts are generally
It is in the form of overbased and / or neutral complexes with high molecular weight aliphatic carboxylic acids, sulfonic acids, anhydrides, esters, amides, imides or salts. These overbased complexes can be used as additives in lubricating oils, gasoline or other organic materials.

Common overbased complexes are described in US Pat.
No. 4,042, which is incorporated herein by reference for the purpose of disclosing calcium salts and calcium salt complexes which may be used in connection with the present invention. The inventors of the present invention have found that many other types of metal salts and metal salt complexes are commonly used in the art, but only calcium salts and calcium salt complexes provide the desired properties of the functional fluids of the present invention. I found that I would provide it. Further, an overbased and / or neutral calcium complex may be added to the overbased and / or neutral calcium sulfonate, an overbased and / or
It has now been found that it is preferable to contain in the form of neutral calcium sulfonate-calcium carboxylate and overbased calcium carboxylate.

Mixtures of overbased calcium carbonate complexes are useful in connection with the functional fluids of this invention,
By carbonating an oil-soluble sulfonic acid (eg, a type of sulfonic acid including petroleum sulfonic acid, alkylbenzene sulfonic acid, etc.) alone or in combination with an alkylphenol calcium salt, a mixture of lower alcohol and excess lime, Can be formed. Oil-soluble sulfonic acids, or mixtures of acids with alkylphenol calcium salts, are overbased by the use of lime. At this point an overbased calcium carbonate complex is formed.
Such complexes can be used in the context of the present invention. However, it is desirable to use a solution that has been overbased with lime and then stabilized by post-treating the complex with a polyisobutene-substituted succinic anhydride. The overbased calcium complex used in connection with the present invention may be used in combination with other similar compounds containing, for example, a calcium sulfonate salt combined with a phenol calcium salt. This component of the invention appears to contain a mixture of neutral and overbased salt complexes.

The use of the term "complex" relates to basic metal salts which contain an excess of metal than is present in neutral or conventional metal salts. The "metal ratio" which characterizes the complex is therefore the ratio of the total equivalents of metal to the equivalents of metal in the neutral or normal metal form. The "base number" of a complex is the number of milligrams of KOH that is equivalent to 1 gram of the complex, as measured by titration.

The "base number" of the calcium complex used in connection with the present invention varies over the range of about 0 to about 500 TBN. When such a complex is present in the diluent oil, the base number of the calcium complex is preferably in the range of about 200 to about 400, more preferably about 300.

In the present invention, the metal salt complex must contain some calcium metal salt complex. However, other metal salt complexes may be present and calcium salts that are not "overbased" may be present.

Calcium complexes useful for use in connection with the present invention can be prepared by the following steps: A solution of a basic calcium carbonate salt of alkylbenzene sulfonic acid (average molecular weight 385) in mineral oil (base number about 300, calcium--
12.0% and sulfur--1.4%) 950 g are treated with 50 g of polyisobutene (molecular weight 1000) -substituted succinic anhydride (having a saponification number of 100) at 25 ° C. and then added. The mixture
Stir at 55-57 ℃ for 0.65 hours, then at 152-153 ℃ for 0.5 hours, and filter at 150 ℃. The filtrate has a base number of about 300,
Contains 53% mineral oil.

The calcium salt complexes preferably used in connection with the present invention are useful for imparting improved properties such as dispersibility and rust protection, and when used in tractor fluids, the weight of the fluid is reduced. Based on about 0.5 to about 5.5 parts by weight.

The EP / antiwear agent used in connection with the present invention is in the form of zinc dithiophosphate. Although there are a great many different types of antiwear agents that can be utilized with such functional fluids, the inventors of the present invention have found that zinc dithiophosphate type antiwear agents provide the desired properties. It has been found to work particularly well in relation to the other ingredients of. Particularly useful zinc dithiophosphate antiwear agents are disclosed in US Pat. No. 4,263,150, which is incorporated herein by reference for purposes of disclosing suitable zinc dithiophosphates.

It has been found that salts of dialkyldithiophosphoric acids treated with phosphorous acid and / or olefins are particularly good for the present invention. More specifically, such salts or acid precursors thereof are treated with triaryl phosphite,
Especially when treated with triphenyl phosphite, functional fluids,
Especially with regard to the tractor fluid of the invention, very good results are obtained. By treating these zinc salts or their acid precursors with triaryl phosphite compounds, the treated zinc salts have a reduced tendency to rust or corrode the metal parts in which they are used. In particular, such treated zinc salts or acid precursors hardly rust or corrode the copper part.

Salts of dialkyldithiophosphoric acids are known to be effective with respect to their wear resistance when used with lubricating compositions. However, the antiwear agents used in connection with the present invention have somehow removed the sulfur activity of such zinc salts. One means for removing sulfur activity involves treating the salt or its acid precursor with phosphite. For example, antiwear agents useful in the context of the present invention can be prepared by the following method: Triphenyl phosphite is heated with zinc dialkyldithiophosphate or a mixed zinc salt of dialkyldithiophosphoric acid and a carboxylic acid. The dialkyldithiophosphoric acid used to prepare the zinc salt is prepared by the reaction of at least one alcohol with phosphorus pentasulfide containing a stoichiometric excess of sulfur.

The zinc dithiophosphate component of the present invention is added in an amount sufficient to improve the wear resistance of the fluid. When used in a tractor fluid, this component is present in an amount of about 1 to about 4 weight percent, based on the weight of the fluid.

Various compounds containing boron are known to be effective for functional fluids. Currently, borated epoxides have been found to work particularly well when combined with the other components described herein to provide functional fluids with improved properties. Such borated epoxides can be obtained by reacting an epoxide represented by the following general structural formula with boric acid, boric oxide, or an alkyl borate:

[0039]

Embedded image

Here, R, R ′, R ² and R ³ are hydrogen or a C _8-30 hydrocarbyl group, and at least one of them is a hydrocarbyl group. The alkyl borate has the formula (RO) xB (OH) y, where x is 1-3, and y is 0-2, the sum of which is 3, or boron oxide. And R is an alkyl group having 1 to 6 carbon atoms. Such borated epoxide compounds are disclosed in US Pat. No. 4,410,438, incorporated herein by reference for the purpose of disclosing the borated epoxides used in connection with the functional fluids of the present invention.

One preferred borated epoxide is boric acid and the 1,2-containing epoxide has about 16 carbon atoms.
Obtained as a result of reaction with an epoxide mixture.

Borated epoxides useful in the present invention can be prepared by including hexadecane-1,2-epoxide with boric acid. The mixture is heated to about 180 ° C in the presence of water and toluene. This reaction is
It can be carried out in the presence of diluent oil. The resulting product is a borated epoxide compound useful with the functional fluids of the present invention.

The borated epoxide is present in an amount sufficient to give the fluid the ability to pass tests on the fluid, and for tractor fluids, the borated epoxide is based on the weight of the fluid. , About 0.1 to about 1.5
Present in weight percent.

The fourth essential component of the functional fluid of the present invention is
It is a carboxyl solubilizer. This component can interact with other components in such a way as to produce a microemulsion of water particles that provides improved water resistance and filterability. The carboxyl solubilizer component is present in an amount sufficient to provide these properties, improved water resistance and filterability, and for tractor fluids, about 0.1 based on the weight of the fluid. % To about 1% by weight. Preferred examples of such a carboxyl solubilizer include:
US Pat. No. 4,435,297, incorporated herein by reference, to disclose carboxyl solubilizers useful with the functional fluids of the present invention.

The carboxyl solubilizer used in connection with the functional fluid of the present invention is a carboxylic acid derivative containing nitrogen but not phosphorus. These derivatives are obtained by reacting an acylating agent with an alkanol tertiary monoamine. It has now been found that certain solubilizers work particularly well with functional fluids, especially those useful as tractor fluids. The most preferred carboxyl solubilizer found by the inventors of the present invention is the product obtained by reacting polybutylene succinic anhydride with N, N-diethylethanolamine in a molar ratio of 1: 2. . The product is predominantly an ester-salt with a small amount of diester. In addition, this product contains a small amount of free unreacted polybutylene and N, N
-Contains traces of maleic anhydride reacted with diethylethanolamine.

The carboxyl solubilizers most preferably used in the context of the present invention are nitrogen-containing but phosphorus-free carboxylic acid derivatives. The carboxylic acid derivative is
It is obtained by reacting (A) a carboxylic acylating agent with (B) an alkanol tertiary monoamine at a temperature in the range from about 30 ° C. to the decomposition temperature of one or more reaction components. The acylating agent has at least one hydrocarbyl substituent having about 20 to about 500 carbon atoms,
Monoamine (B) contains one hydroxyl group and about
It has up to 40 carbon atoms.

In addition to the four essential components mentioned above, the functional fluid of the present invention preferably contains a viscosity improver and an antifoaming agent. The type and amount of each component is adjusted depending on factors such as operating temperature, desired viscosity and amount of fluid agitated, and amount of foaming allowed. Since functional fluids are utilized in equipment over a wide temperature range, it is highly desirable to include a viscosity improver to help control the viscosity of the fluid. The viscosity improver is generally present in an amount of about 0.5 to about 8% by weight, based on the weight of the fluid. In addition, the fluid is generally subject to considerable mechanical agitation and pressure,
It is highly desirable to include an antifoaming agent to reduce and / or eliminate foaming which can cause problems with the mechanical operation of the equipment with which this fluid is used. The defoamer is generally present in an amount of about 0.005-0.08% by weight, based on the weight of the fluid.

Some useful viscosity index improvers include the well-known polymethacrylate compounds, hydrogenated styrene-butyldiene viscosity improvers, and styrene-malan copolymers. Useful defoamers include about 90% by weight kerosene and about 10% by weight silicone agent (DC 200, VIS 30,000 c
St, at 25 ° C).

The functional fluids of the present invention can be in the form of various specific types of functional fluids, such as hydraulic / transmission fluids, brake fluids, power steering fluids, and tractor fluids. These exact compositions may vary slightly. The precise composition of such fluids can be formulated by those of ordinary skill in the art by reading the present disclosure and considering the properties of the fluid that are effective in the ranges of ingredients and amounts disclosed. In order to provide the invention in the form of a final product, it is necessary to include four essential ingredients in the hydrocarbon oil. The four essential ingredients in the form of active chemicals are:
From about 0.5 to about 1 based on the total weight of the functional fluid of the present invention.
It is present in hydrocarbon oils in amounts ranging from 9.5% by weight. Therefore, hydrocarbon oils, based on the total weight of the functional fluid,
It is present in an amount ranging from about 81.5 to about 99.5%.

The four essential ingredients of the invention may be contained in the concentrate by themselves or in combination with other ingredients. The concentrate may contain from about 1% to about 99% by weight of active chemicals, while the balance of the concentrate contains hydrocarbon oils.

When formulating a tractor fluid, the hydrocarbon oil is generally present in an amount ranging from about 81.5% to about 99.5% by weight. Each essential component of the tractor fluid is
Present in the following amounts: Calcium salt is about 0.5% by weight to about
Present in an amount of 5.5% by weight; EP / antiwear agent about 1% by weight
Is present in an amount of about 4% by weight; the borated epoxide is about
0.1% to about 1.5% by weight and the carboxyl solubilizer is present in an amount of about 0.1% to about 1% by weight. All of these amounts are based on the weight of active chemicals in the total tractor fluid.

In a particularly preferred embodiment of the present invention, the calcium salt is present in an amount of about 1.41% or about 3% by weight with the diluent oil. The EP / antiwear agent is present in an amount of about 1.7% by weight; the borated epoxide is present in an amount of about 0.5% by weight and the carboxylic solubilizer is based on the weight of the total tractor fluid and the active chemistry. It is present in an amount of about 0.25% by weight of the material.

[0053]

Example I 2.82% by weight of overbased calcium sulfonate complex;
38% by weight zinc dithiophosphate; 1% by weight borated epoxide and 0.5% by weight carboxyl solubilizer; 1.93
Wt% styrene / maleic anhydride VI improver and 0.02
A formulation containing wt% silicone antifoam was dissolved in a hydrocarbon oil.

Example II 1.76 wt% overbased calcium sulfonate complex; 2.14 wt% zinc dithiophosphate treated with triphenyl phosphite; 0.63 wt% borated epoxide and 0.
A formulation containing 31% by weight of a carboxyl solubilizer as an essential ingredient and 1.93% by weight of styrene / maleic anhydride VI improver; and 0.02% by weight of a silicone defoamer was dissolved in a hydrocarbon oil. It was

Example III 1.41 wt% overbased calcium sulfonate complex; olefin treated 1.71 wt% zinc dithiophosphate; 0.5 wt% borated epoxide and 0.25 wt%
Contains the carboxyl solubilizer of
A formulation containing 1.93 wt% styrene / maleic anhydride VI improver; and 0.02 wt% silicone antifoam was dissolved in a hydrocarbon oil.

With respect to each of the embodiments described above, it is possible to make some modifications to each of the actual components. For example, for the use of overbased calcium sulfonate complexes, the actual component utilized is overbased with a calcium compound and then polyisobutylene succinic acid or polysulfate having a molecular weight in the range of about 700 to about 5,000. It can be a calcium sulfonate complex treated with isobutylene succinic anhydride. With respect to zinc dithiophosphate, this component is bis (2-) treated with triphenyl phosphite.
It can be a mixture of a zinc salt of ethylhexyl) dithiophosphoric acid and a zinc salt of 2-ethylhexylcarboxylic acid treated with triphenylphosphite. This salt is preferably combined with a stoichiometric excess of zinc. That is, the salt is preferably overzincified and stoichiometrically contains about 1.2 to about 1.4 equivalents of zinc. Borated epoxides are boric acid and 1, 2 having about 16 carbon atoms.
It may be the product resulting from the reaction of the epoxide. The carboxyl solubilizer may be the product resulting from the reaction of polybutenyl succinic anhydride with N, N-diethylethanolamine in a molar ratio of about 1: 2. In addition, these formulations may contain other ingredients depending on the desired end use. The actual specific compounds used as each essential ingredient, their amounts, and other added active chemicals can be selected by one of ordinary skill in the art depending on the particular requirements of the functional fluid being manufactured. The amount of chemical components and the actual specific type of variability can be inferred by one of ordinary skill in the art having regard to the needs and reading the description herein.

The present invention has been disclosed and described herein in what is considered to be the preferred embodiments. However, it is recognized that one of ordinary skill in the art will appreciate, upon reading this disclosure, some modifications that are considered to be within the scope of the invention.

[0058]

According to the present invention, a functional fluid having a wide variety of various functional characteristics, especially when used as a fluid for a tractor, is provided.

The present invention also provides a functional fluid that can pass a wide variety of tests relating to EP / antiwear properties, water resistance, properties such as brake capacity, friction and filterability.

The invention further relates to improved low temperature fluidity / filterability, EP / wear resistance, friction improving properties, wet brake squeak control, and action of hydraulic equipment, transmissions, power steering and brakes. In the area of competence, improved performance is provided at the same time without compromising performance in other areas.

Further, according to the present invention, the performance relating to EP / wear resistance performance is improved without having an undesired effect on the corrosion test and the transmission performance.

The present invention also provides improved water resistance without limiting the performance of the EP by including a surfactant.

Furthermore, according to the present invention, friction characteristics, low temperature fluidity, seal swell characteristics, defoaming characteristics, antioxidant characteristics,
And functional fluids are provided that can pass a wide variety of tests for properties, such as EP protection as shown in the spiral bevel test and straight spur gear test.

Further, according to the present invention, sufficient power steering performance is provided, and at the same time, sufficient transmission performance shown by the Turbo Hydra-matic oxidation test (test by General Motor Co.) is provided.

Furthermore, according to the present invention, the power shift transmission clutch is provided with sufficient friction retention, and in particular, it is provided with corrosion inhibition relating to the corrosion of yellow metal (that is, copper, brass, bronze) and improved EP performance, A fluid is provided that provides adequate friction characteristics for squeaking of the wet brake, and at the same time provides wet braking capability and power disconnect clutch performance.

According to the present invention, a functional fluid is provided that contains essential ingredients such that the fluid simultaneously provides various desirable properties.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location C10M 139: 00 159: 12) (C10M 159/12 129: 93 133: 08) C10N 10:04 30 : 00 30:04 30:06 40:04 40:08 60:00 60:12 (71) Applicant 594099901 29400 Lakeland Boulevard, Wickliffe, Ohio 44092, U.S.A. S. A. (72) Inventor Craig Dee. Tipton USA Ohio 44081, Perry, Cole Road 3593, (72) Inventor Reed H. Walsh United States Ohio 44060 Mentor, Spring Valley Drive 8785

Claims (2)

[Claims] 1. 81.5% to 99.5% by weight of hydrocarbon oil and 0.5% to 19.5% by weight sufficient to improve fluid properties.
A functional fluid containing, by weight, an additive, the additive being overbased with a calcium compound, and then 700-
Treated with polyisobutylene succinic acid or polyisobutylene succinic anhydride having a molecular weight in the range of 5,000,
Calcium sulfonate complex; antiwear agent in the form of a mixture of zinc salt of bis (2-ethylhexyl) dithiophosphoric acid and zinc salt of 2-ethylhexanoic acid treated with triphenyl phosphite; boric acid and 16 Borated epoxides obtained as reaction products with 1,2-epoxides having 5 carbon atoms; and carboxyls obtained as reaction products of N, N-diethylethanolamine with polybutenyl succinic anhydride in a molar ratio of 1: 2 Contains a solubilizer,
Functional fluid. 2. The calcium salt is present in an amount of 0.5-5.5 wt% based on the weight of the fluid; and the EP / antiwear agent is 1-4 wt% based on the weight of the fluid.
Is present in an amount of 0.1 to 1.5% by weight based on the weight of the fluid; and the carboxylic solubilizer is 0.1 to 1% based on the weight of the fluid. A fluid according to claim 1, which is present in an amount of% by weight.