(19)
(11) EP 4 541 873 A1

(12) EUROPEAN PATENT APPLICATION

(43) Date of publication:
23.04.2025 Bulletin 2025/17

(21) Application number: 23205912.1

(22) Date of filing: 25.10.2023
(51) International Patent Classification (IPC): 
C10M 111/00(2006.01)
C10M 171/00(2006.01)
(52) Cooperative Patent Classification (CPC):
C10M 171/00; C10M 2203/1085; C10M 2205/006; C10M 2205/026; C10M 2205/0265; C10M 169/044; C10M 111/00; C10N 2030/02; C10N 2020/02; C10N 2030/06; C10N 2030/12; C10N 2030/14; C10N 2050/04; C10N 2040/04; C10M 2219/066
 
C-Sets:
C10M 2219/066, C10N 2010/12;
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA
Designated Validation States:
KH MA MD TN

(30) Priority: 20.10.2023 PT 2023118991

(71) Applicant: Moolix Consulting Unipessoal Lda.
2765-447 Estoril (PT)

(72) Inventor:
  • POLACEK SENGER, Roberto Pablo
    Estoril (PT)

   


(54) ULTRA-HIGH VISCOSITY LUBRICANT COMPOSITIONS AND USE THEREOF


(57) The present disclosure is directed lubricant compositions comprising from 60% to 90% (w/w) of a base oil, and from 5% to 30% (w/w) of an additive, wherein the composition has a kinematic viscosity at 40 °C from 150 000 to 250 000 mm2/s. Methods for producing such compositions and uses thereof, are also disclosed.


Description

FIELD OF THE INVENTION



[0001] The present disclosure relates generally to lubricant compositions having ultra-high viscosity and use thereof, e.g for open gears.

BACKGROUND OF THE INVENTION



[0002] Open gear systems are integral components in various industrial sectors such as mining, cement, paper, fertilizers, power and chemical industries. Lubricants used for open gears must withstand extreme conditions and provide efficient protection against wear, corrosion, and other forms of damage.

[0003] Traditionally, lubricants used in open gear applications have faced challenges in maintaining effective film thickness, reducing wear and friction, and preventing corrosion and pitting. Additionally, environmental concerns and stringent regulations have further necessitated the development of lubricants that are both effective and environmentally friendly.

[0004] Patent WO1997034970A1 discloses mist oil lubricants based on polycarboxylic acid esters as the base oil which have added 1 to 5 % of polyisobutylene Mn 400-2500 as stray mist suppressants.

[0005] Patent WO1988008023A1 discloses a lubricant or lubricant concentrate based on mineral and/or synthetic oil with improved lubricating properties, in particular improved load-bearing, sliding and anticorrosion properties, contains a) one or more mineral and/or synthetic oils as basic oil, and b) at least one compound, which has at least one quaternary carbon atom and at least one ester and/or ether bond per molecule, as well as c) other usual additives.

SUMMARY OF THE INVENTION



[0006] In one aspect of the disclosure, there is provided a lubricant composition comprising from 60% to 90% (w/w) of a base oil, and from 5% to 30% (w/w) of an additive, wherein the composition has a kinematic viscosity at 40 °C from 150 000 to 250 000 mm2/s.

[0007] In some embodiments, the composition comprises from 65% to 80% (w/w), preferably from 70% to 80%, of the base oil.

[0008] In some embodiments, the composition comprises from 7% to 30% (w/w), preferably from 7% to 25% (w/w), more preferably from 10% to 17% (w/w), of the additive.

[0009] In some embodiments, the base oil comprises a brightstock oil, a hydrocarbon resin and poly-isobutylene.

[0010] In some embodiments, the base oil comprises from 25% to 35% (w/w) of brightstock oil, from 30% to 40% (w/w) of hydrocarbon resin and from 5% to 15% (w/w) of poly-isobutylene.

[0011] In some embodiments, the composition comprises from 5% to 20% (w/w), preferably from 7% to 15% (w/w) of a low viscosity oil.

[0012] In some embodiments, the low viscosity oil has a kinematic viscosity at 40 °C from 1 to 5 mm2/s, preferably from 1 to 3 mm2/s.

[0013] In some embodiments, the composition has a kinematic viscosity at 40 °C from 3000 to 5000 mm2/s, preferably from 3000 to 4000 mm2/s.

[0014] In some embodiments, the additive comprises extreme pressure (EP) additive, antiwear (AW) additive, molybdenum dialkyldithiocarbamate (DTCM), or any combination thereof.

[0015] In some embodiments, the additive comprises from 5% to 10% (w/w) of extreme pressure (EP) additive, from 1.5% to 3% (w/w) of antiwear (AW) additive and from 1% to 2% (w/w) of molybdenum dialkyldithiocarbamate (DTCM).

[0016] In some embodiments, the composition comprises from 0.01% to 0.09 % (w/w) of a colorant.

[0017] In some embodiments, the composition is a sprayable composition.

[0018] In another aspect of the disclosure, there is provided a method for obtaining a composition according to the present disclosure, the method comprising: contacting 60% to 90% (w/w) of a base oil, with from 5% to 30% (w/w) of an additive, and measuring a kinematic viscosity with means for measuring a viscosity, until a kinematic viscosity at 40 °C from 150 000 to 250 000 mm2/s is obtained.

[0019] In another aspect of the disclosure, there is provided a method for obtaining a composition according to the present disclosure, the method comprising: heating a brightstock oil to a temperature from 70 °C to 120 °C; adding a hydrocarbon resin and poly-isobutylene under slow agitation for a period of time until a base oil blended mixture is obtained; cooling the mixture to a temperature from 40 °C to 68 °C and adding an additive and optionally a colorant.

[0020] In some embodiments, the method further comprises a step of cooling the mixture to a temperature from 10 °C to 25 °C and adding a low viscosity oil.

[0021] In another aspect of the disclosure, there is provided a use of the composition according to the present disclosure, in mining industry, cement industry, paper industry, fertilizers industry, power industry, chemical industry, or any combination thereof.

[0022] Unless otherwise defined, all technical and/or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the disclosure pertains. Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of embodiments of the disclosure, exemplary methods and/or materials are described below. In case of conflict, the patent specification, including definitions, will control. In addition, the materials, methods, and examples are illustrative only and are not intended to be necessarily limiting.

[0023] Further embodiments and the full scope of applicability of the present disclosure will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the disclosure, are given by way of illustration only, since various changes and modifications within the spirit and scope of the disclosure will become apparent to those skilled in the art from this detailed description.

DETAILED DESCRIPTION OF THE INVENTION



[0024] According to some embodiments, the present disclosure provides a lubricant composition.

[0025] In some embodiments, the composition comprises from 60% to 90% (w/w) of a base oil, and from 5% to 30% (w/w) of an additive. In some embodiments, the base oil has a kinematic viscosity at 40 °C from 150 000 mm2/s to 250 000 mm2/s. In some embodiments, the composition comprising from 60% to 90% (w/w) of a base oil, and from 5% to 30% (w/w) of an additive, has a kinematic viscosity at 40 °C from 150 000 mm2/s to 250 000 mm2/s.

[0026] In some embodiments, the composition comprises from 65% to 80% (w/w) of the base oil. In some embodiments, the composition comprises from 70% to 80%, of the base oil.

[0027] In some embodiments, the composition comprises from 7% to 30% (w/w) of the additive. In some embodiments, the composition comprises from 7% to 25% (w/w) of the additive. In some embodiments, the composition comprises from 10% to 17% (w/w), of the additive.

[0028] The present disclosure is based, in part, on the finding that a lubricant composition as described herein, combining a base oil with ultra-high viscosity (from 150 000 mm2/s to 250 000 mm2/s) and a specific set of additives as described herein, demonstrates exceptional performance in terms of gear protection, longevity, and operational efficiency.

[0029] As used herein, "ultra-high viscosity" refers to substances or materials that have an exceptionally high level of resistance to flow. Such materials may behave more like a solid than a liquid. They are typically very thick and may flow very slowly, if at all.

[0030] According to the present disclosure, an ultra-high viscosity oil is an oil with a kinematic viscosity of at least 5000 cSt at 40°C. In some embodiments, an ultra-high viscosity oil is an oil with kinematic viscosity of at least 10 000 cSt at 100°C. In some embodiments, an ultra-high viscosity oil is an oil with kinematic viscosity of at least 100 000 cSt at 100°C.

[0031] As used herein, "lubricant composition" refers to a mixture of various components designed to be applied to gear, to reduce friction, minimize wear, and provide protection to moving parts in machinery and equipment. Lubricant compositions have a crucial role in a wide range of applications across industries by reducing the mechanical forces that occur when two surfaces slide or roll against each other.

[0032] In some embodiments, the base oil is a mixture of oils. As used herein, "base oil" refers to one or a mixture of base oils. A base oil according to the present disclosure refers to the primary components of lubricants. Non-limiting examples of base oil according to the present disclosure includes mineral oil (derived from petroleum), synthetic hydrocarbons, polyalphaolefins (PAOs), esters, and any combination thereof.

[0033] In some embodiments, the base oil comprises a brightstock oil, a hydrocarbon resin and poly-isobutylene.

[0034] In some embodiments, the base oil comprises from 25% to 35% (w/w) of brightstock oil, from 30% to 40% (w/w) of hydrocarbon resin and from 5% to 15% (w/w) of poly-isobutylene. In some embodiments, the base oil consists of from 25% to 35% (w/w) of brightstock oil, from 30% to 40% (w/w) of hydrocarbon resin and from 5% to 15% (w/w) of poly-isobutylene.

[0035] In some embodiments, the composition comprises 25% to 35% (w/w) of brightstock oil, from 30% to 40% (w/w) of hydrocarbon resin and from 5% to 15% (w/w) of poly-isobutylene, as base oil, and from 5% to 30% (w/w) of an additive.

[0036] In some embodiments, the brightstock oil has a kinematic viscosity at 40 °C of about 900 to 1100 mm2/s (cSt).

[0037] In some embodiments, the hydrocarbon resin is solid at room temperature. Suitable hydrocarbon resin according to the present disclosure include oil soluble resins. Non-limiting examples of hydrocarbon resin according to the present disclosure include C5-C9 hydrocarbon resins. In some embodiments, the hydrocarbon resin is a C5 hydrocarbon resin. According to the present disclosure, a mixture of a hydrocarbon resin and a brightstock oil has a viscosity at 40 °C of about 100 000 cSt.

[0038] In some embodiments, the poly-isobutylene has a kinematic viscosity at 100 °C of about 4.700 cSt. According to the present disclosure, the use of poly-isobutylene provides thermal stability and a higher viscosity to the composition. In some embodiments, poly-isobutylene increases the viscosity of the composition.

[0039] The present disclosure is based, in part, on the finding that a lubricant composition as described herein, comprising a base oil with ultra-high viscosity does not solidify at sub-zero temperatures and does not loose adhesiveness at high temperatures.

[0040] The present disclosure is based, in part, on the finding that a lubricant composition as described herein, comprising a base oil with ultra-high viscosity, ensures exceptional load-carrying capacity and film formation, even under extreme conditions. A base oil as described herein provides enhanced adhesion to gear surfaces, reducing fling-off and ensuring long-lasting lubrication. Reference is made to Example 1, table 1, presenting the results of tests such as 4- ball and FZG test rigs. The values obtained on the tests, are the highest according to OEM's recommendations.

[0041] In some embodiments, the composition comprises from 10% to 30% (w/w) of the additive.

[0042] In some embodiments, the additive comprises extreme pressure (EP) additive, antiwear (AW) additive, molybdenum dialkyldithiocarbamate (DTCM), or any combination thereof.

[0043] In some embodiments, the additive comprises from 5% to 10% (w/w) of extreme pressure (EP) additive, from 1.5% to 3% (w/w) of antiwear (AW) additive and from 1% to 2% (w/w) of molybdenum dialkyldithiocarbamate (DTCM). In some embodiments, the additive consists of from 5% to 10% (w/w) of extreme pressure (EP) additive, from 1.5% to 3% (w/w) of antiwear (AW) additive and from 1% to 2% (w/w) of molybdenum dialkyldithiocarbamate (DTCM).

[0044] The present disclosure is based, in part, on the finding that a combination of additives as described hereinabove, provides important benefits to the composition. A composition as described herein comprising the additives provides increased protection against metal-to-metal contact which lowers the wear in gears. Moreover, a composition as described herein has the ability to smoothen and flatten a gear surface by chemically active plastic deformation of asperities of gears.

[0045] In some embodiments, the composition comprises a low viscosity oil. In some embodiments, the composition comprises from 5% to 20% (w/w) of a low viscosity oil. In some embodiments, the composition comprises from 7% to 15% (w/w) of a low viscosity oil. In some embodiments, the composition comprises from 5% to 10% (w/w) of a low viscosity oil. In some embodiments, the low viscosity oil has a kinematic viscosity at 40 °C from 1 to 5 mm2/s, preferably from 1 to 3 mm2/s.

[0046] As used herein, the terms "low viscosity oil" and "light oil" are used interchangeably to refer to an oil with a relatively thin consistency and with ability to flow easily. A low viscosity oil typically has a low numerical value for viscosity or kinematic viscosity, indicating that it flows more easily and is less resistant to movement compared to oils with higher viscosities. According to the present disclosure, a low viscosity oil is an oil with a kinematic viscosity of less than 20 cSt at 100°C. In some embodiments, a low viscosity oil is an oil with kinematic viscosity of less than 10 cSt at 100°C. In some embodiments, a low viscosity oil is an oil with kinematic viscosity of less than 5 cSt at 100°C. Low viscosity oils are known in the art and are commonly used in various applications, especially where quick and efficient lubrication or fluid flow is needed. Non-limiting example of a suitable low viscosity oil according to the present disclosure includes evanescent spindle oil ISO 2 (2 cSt at 40 °C).

[0047] In some embodiments, a composition comprising from 60% to 90% (w/w) of a base oil described hereinabove, from 7% to 20% (w/w) of an additive as described hereinabove and from 5% to 20% (w/w) of a low viscosity oil as described hereinabove, has a kinematic viscosity at 40 °C from 3000 to 5000 mm2/s.

[0048] The present disclosure is based, in part, on the finding that the light oil fraction (low viscosity oil as described herein) determines the final viscosity of the composition. The use of a light oil as described herein acts as a carrier and it makes the composition sprayable. According to the present disclosure, the ratio of low viscosity oil used and final composition kinematic viscosity is essential. If the amount of low viscosity oil used is less than the range described herein above, the final composition will be extremely viscous which makes it not possible to apply it by spray. If too much light oil is used (more than the range described herein), the composition won't have ability to lubricate properly the gears and will sling-off by centrifugal force.

[0049] According to the present disclosure, the final viscosity of the base oil mixture and additives is extremely high for a spray application process, which is made e.g., by a grease-air spray system. Automatic lubrication systems are able to pulverize lubricants with up to 20.000 cSt viscosity. The present disclosure is based, in part, to the fact that the addition of a special light oil (low viscosity oil as described herein) with a kinematic viscosity at 40 °C of about 2 cSt, lowers the viscosity of the final composition making it possible for the application by grease-air systems.

[0050] In some embodiments, the final viscosity of a composition as described herein with about 10% of this oil is about 3500 cSt at 40 °C.

[0051] The present disclosure is based, in part, to the fact that once the composition is applied (e.g., sprayed) and covering gear surfaces, the low viscosity oil gradually evaporates, therefore gradually increasing the viscosity of the composition. This physical effect causes a higher lubricant film adhesiveness and shear resistance. The present feature as described herein promotes prevention of metal-to-metal contact in gears.

[0052] In some embodiments, a composition as described herein is a sprayable composition. In some embodiments, a composition as described herein is a sprayable composition from at least 5°C. According to the present disclosure, a composition as described herein may be pump and sprayed below 5 °C, by slightly heating the composition (e.g., in a drum, in a nozzle, or both).

[0053] As used herein the term "sprayable composition" refers to a fluid that is formulated to be easily sprayed or applied as a spray over a broader range of surfaces and equipment. In some embodiments, a sprayable composition as described herein is an oil sprayable composition. A sprayable composition as can be applied using various methods, non-limiting examples include hand-held spray bottles, spray guns, or automated spray systems. Sprayable oil compositions are often used for maintenance and general lubrication tasks. They can also be used for applications such as coating surfaces with a protective oil layer.

[0054] A sprayable composition, particularly a sprayable oil composition is formulated to have specific characteristics that make it suitable for application using spray equipment or aerosol dispensers. These characteristics (such as viscosity) enable the oil to be atomized into fine droplets and effectively sprayed onto surfaces or components. According to the present disclosure, a composition as described herein is a sprayable composition due to its: i) appropriate viscosity (that allows the oil to flow more easily through spray nozzles and atomize into fine droplets when subjected to pressure); ii) fine atomization (breaks down into droplets when sprayed); iii) stability under pressure and operating temperature; iv) adherence to a surface to provide lasting lubrication or protection against corrosion.

[0055] According to the present disclosure, a sprayable composition as described hereinabove is devoid of solvents as carrier fluids.

[0056] In some embodiments, the composition comprises a colorant. In some embodiments, the composition comprises from 0.01% to 0.09 % (w/w) of a colorant. A concentration of the colorant as described herein, was calculated in order to recognize different color intensities according to the composition thickness (depending on the light oil present). The present disclosure is based, in part, on the finding that this feature is unique in lubricants, particularly in open gear lubricants and it facilitates to a user to check very quickly the presence or absence of lubricant on the gears.

[0057] According to the present disclosure a colorant is a blue dye, preferably a Prussian Blue colorant, which improves the visibility for technical inspections of gears. A composition as described herein comprising a colorant, preferably a Prussian Blue colorant is a blue colored and translucent composition, wich improves the identification of the lubrican composition and the inspection of gears.

[0058] According to some embodiments, the present disclosure provides a method for obtaining a composition as described hereinabove.

[0059] In some embodiments the method comprises: contacting 60% to 90% (w/w) of a base oil, with from 5% to 30% (w/w) of an additive, and measuring a kinematic viscosity with means for measuring a viscosity, until a kinematic viscosity at 40 °C from 150 000 to 250 000 mm2/s is obtained.

[0060] As used herein "means for measuring a viscosity" refers to a method, apparatus, device, instrument, equipment, or any other system that can perform the function of measuring kinematic viscosity. Kinematic viscosity is a property of a fluid that characterizes its resistance to flow under the influence of gravity and is often used to describe the thickness of a fluid. Methods or technology used for measuring kinematic viscosity are well known in the art and will become apartment to those skilled in the art. Non-limiting examples include instruments such as viscometers, rheometers, or other measurement devices designed to assess the kinematic viscosity of a fluid.

[0061] In some embodiments the method comprises: heating a mineral brightstock oil to a temperature from 70 °C to 120 °C; adding a hydrocarbon resin and poly-isobutylene under slow agitation for a period of time until a blended mixture is obtained; cooling the mixture to a temperature from 40 °C to 68 °C and adding an additive and optionally a colorant.

[0062] In some embodiments, the method further comprises a step of cooling the mixture to a temperature from 10 °C to 25 °C and adding a low viscosity oil.

[0063] According to some embodiments, the present disclosure provides a use of the composition as described hereinabove, in mining industry, cement industry, paper industry, fertilizers industry, power industry, chemical industry, or any combination thereof.

[0064] As used herein the term "about" refers to ± 10 %.

[0065] The terms "comprises", "comprising", "includes", "including", "having" and their conjugates mean "including but not limited to".

[0066] The word "exemplary" is used herein to mean "serving as an example, instance or illustration". Any embodiment described as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments and/or to exclude the incorporation of features from other embodiments.

[0067] As used herein, the singular form "a", "an" and "the" include plural references unless the context clearly dictates otherwise. For example, the term "a compound" or "at least one compound" may include a plurality of compounds, including mixtures thereof.

[0068] Throughout this application, various embodiments of this disclosure may be presented in a range format. It should be understood that the description in range format is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the disclosure. Accordingly, the description of a range should be considered to have specifically disclosed all the possible subranges as well as individual numerical values within that range. For example, description of a range such as from 1 to 6 should be considered to have specifically disclosed subranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6 etc., as well as individual numbers within that range, for example, 1, 2, 3, 4, 5, and 6. This applies regardless of the breadth of the range.

[0069] Whenever a numerical range is indicated herein, it is meant to include any cited numeral (fractional or integral) within the indicated range. The phrases "ranging/ranges between" a first indicate number and a second indicate number and "ranging/ranges from" a first indicate number "to" a second indicate number are used herein interchangeably and are meant to include the first and second indicated numbers and all the fractional and integral numerals therebetween.

[0070] As used herein the term "method" refers to manners, means, techniques and procedures for accomplishing a given task including, but not limited to, those manners, means, techniques and procedures either known to, or readily developed from known manners, means, techniques and procedures by practitioners of the chemical, pharmacological, biological, biochemical and medical arts.

[0071] It is appreciated that certain features of the disclosure, which are, for clarity, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, various features of the disclosure, which are, for brevity, described in the context of a single embodiment, may also be provided separately or in any suitable subcombination or as suitable in any other described embodiment of the disclosure.

[0072] Various embodiments and aspects of the present disclosure as delineated hereinabove and as claimed in the claims section below find experimental support in the following examples.

EXAMPLES



[0073] Reference is now made to the following examples, which together with the above descriptions illustrate some embodiments of the disclosure in a non-limiting fashion.

Materials and methods


General procedure



[0074] A process for obtaining a lubricant composition according to the present disclosure is performed in a kettle or reactor where all ingredients are blended at different temperatures. The kettle or reactor is equipped with a hot oil heating system, cooling system and a variable speed stirring shaft with adapted blades for grease. A mineral oil is added to the kettle and heated to about 95 °C. Once the temperature has been reached, a petroleum resin is slowly added with the agitator at low speed (30 to 60 rpm). The time of complete blending may vary depending on reactor (temperature induction, speed, size, design). The mixture is cooled down to about 60 °C with agitation and additives EP, AW, DTCM and colorant are added. Agitation is maintained until additives are dissolved and then the mixture is cooled to about 15-20 °C. Once the temperature is reached, the light oil low viscosity oil) is added. Agitation is maintained until the viscosity of the entire mass decreases and stabilizes.

EXAMPLE 1


COMPOSITIONS



[0075] Table 1 presents the technical characteristics of a lubricant composition comprising about 74.4% of a base oil (mineral oil), about 14,6% of additives, and about 11% of a light oil (low viscosity oil), according to the present disclosure.

[0076] The pumpability and sprayability of the composition was tested at different pressures and temperatures normally used in mills and kilns open gear spray systems and its results were satisfactory from 5 °C and above.
Table 1.
TEST METHOD RESULT
Color Visual Intense transparent blue
Kinematic viscosity of base fluid ASTM D-445  
at 40 °C, cSt (calculated)   ∼200,000
at 100 °C, cSt   1,400
Kinematic viscosity at 40°C of finished product, cSt (with diluent)   3450
Viscosity Index ASTM D-2270 568
Flash point, °C ASTM D-92 184
Pour point, °C ASTM D-97 -2
Density at 15 °C ASTM D1298-12b 0.946
Four Ball machine: ASTM D-2783 >800
Weld load, kg Scar diameter, mm ASTM D-4172 0.42
FZG machine FZG A 8,3/90 DIN >12
Load stage 51354, part 1 <0.20
Specific wear, mg/kW    
Copper strip corrosion, 100°C/3h ASTM D-4048 1b
Sprayability test Bijur DeLimon method Sprayable from 5°C
Kesternich flow pressure at 5°C, mbar DIN 51805 ≤1400
Operating temperature range, °C   0 to 130


[0077] Despite the ultra-high viscosity of the composition, it does not contain a thickener (like greases) and it does not remain stuck on gear surroundings like casings, nozzle plates, etc. Therefore, the lubricant as disclosed herein will flow down easily to the bottom of the carter for collection purpose.

[0078] Although the disclosure has been described in conjunction with specific embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, it is intended to embrace all such alternatives, modifications and variations that fall within the spirit and broad scope of the appended claims.


Claims

1. Lubricant composition comprising from 60% to 90% (w/w) of a base oil, and from 5% to 30% (w/w) of an additive, wherein said composition has a kinematic viscosity at 40 °C from 150 000 to 250 000 mm2/s.
 
2. Composition according to claim 1, wherein said base oil comprises a brightstock oil, a hydrocarbon resin and poly-isobutylene.
 
3. Composition according to claim 1 or 2, wherein said base oil comprises from 25% to 35% (w/w) of brightstock oil, from 30% to 40% (w/w) of hydrocarbon resin and from 5% to 15% (w/w) of poly-isobutylene.
 
4. Composition according to any one of claims 1 to 3, comprising from 65% to 80% (w/w), preferably from 70% to 80%, of said base oil.
 
5. Composition according to any one of claims 1 to 4, comprising from 7% to 30% (w/w), preferably from 7% to 25% (w/w), more preferably from 10% to 17% (w/w), of said additive.
 
6. Composition according to any one of claims 1 to 5, comprising from 5% to 20% (w/w), preferably from 7% to 15% (w/w) of a low viscosity oil.
 
7. Composition according to claim 6, wherein said low viscosity oil has a kinematic viscosity at 40 °C from 1 to 5 mm2/s, preferably from 1 to 3 mm2/s.
 
8. Composition according to any one of claims 6 or 7, wherein said composition has a kinematic viscosity at 40 °C from 3000 to 5000 mm2/s, preferably from 3000 to 4000 mm2/s.
 
9. Composition according to any one of claims 1 to 8, wherein said additive comprises extreme pressure (EP) additive, antiwear (AW) additive, molybdenum dialkyldithiocarbamate (DTCM), or any combination thereof, preferably said additive comprises from 5% to 10% (w/w) of extreme pressure (EP) additive, from 1.5% to 3% (w/w) of antiwear (AW) additive and from 1% to 2% (w/w) of molybdenum dialkyldithiocarbamate (DTCM).
 
10. Composition according to any one of claims 1 to 9, comprising from 0.01% to 0.09 % (w/w) of a colorant.
 
11. Composition according to any one of claims 6 to 10, wherein said composition is a sprayable composition.
 
12. Method for obtaining a composition according to any one of claims 1 to 11, the method comprising:
contacting 60% to 90% (w/w) of a base oil, with from 5% to 30% (w/w) of an additive, and measuring a kinematic viscosity with means for measuring a viscosity, until a kinematic viscosity at 40 °C from 150 000 to 250 000 mm2/s is obtained.
 
13. Method according to claim 12, the method comprising:

heating a brightstock oil to a temperature from 70 °C to 120 °C;

adding a hydrocarbon resin and poly-isobutylene under slow agitation for a period of time until a base oil blended mixture is obtained;

cooling the mixture to a temperature from 40 °C to 68 °C and adding an additive and optionally a colorant.


 
14. Method according to any one of claims 12 to 13, further comprising a step of cooling the mixture to a temperature from 10 °C to 25 °C and adding a low viscosity oil.
 
15. Use of the composition according to any one of claims 1 to 11, in mining industry, cement industry, paper industry, fertilizers industry, power industry, chemical industry, or any combination thereof.
 





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Cited references

REFERENCES CITED IN THE DESCRIPTION



This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

Patent documents cited in the description