CA1043322A - Multigrade lubricants containing non-aromatic mono-olefin polymers - Google Patents
Multigrade lubricants containing non-aromatic mono-olefin polymersInfo
- Publication number
- CA1043322A CA1043322A CA209,981A CA209981A CA1043322A CA 1043322 A CA1043322 A CA 1043322A CA 209981 A CA209981 A CA 209981A CA 1043322 A CA1043322 A CA 1043322A
- Authority
- CA
- Canada
- Prior art keywords
- composition
- oil
- weight percent
- sae
- polymer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/04—Mixtures of base-materials and additives
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M101/00—Lubricating compositions characterised by the base-material being a mineral or fatty oil
- C10M101/02—Petroleum fractions
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
- C10M105/02—Well-defined hydrocarbons
- C10M105/06—Well-defined hydrocarbons aromatic
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
- C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
- C10M105/32—Esters
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- C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
- C10M105/50—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing halogen
- C10M105/52—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing halogen containing carbon, hydrogen and halogen only
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- C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
- C10M105/74—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing phosphorus
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- C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
- C10M105/76—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing silicon
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- C—CHEMISTRY; METALLURGY
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- C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
- C10M107/02—Hydrocarbon polymers; Hydrocarbon polymers modified by oxidation
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- C10M107/08—Hydrocarbon polymers; Hydrocarbon polymers modified by oxidation containing butene
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- C10M107/20—Lubricating compositions characterised by the base-material being a macromolecular compound containing oxygen
- C10M107/30—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M107/32—Condensation polymers of aldehydes or ketones; Polyesters; Polyethers
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- C10M107/34—Polyoxyalkylenes
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- C10M129/26—Carboxylic acids; Salts thereof
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- C10M129/68—Esters
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- C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
- C10M135/02—Sulfurised compounds
- C10M135/04—Hydrocarbons
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- C10M137/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus
- C10M137/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having no phosphorus-to-carbon bond
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- C10M137/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus
- C10M137/12—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having a phosphorus-to-carbon bond
- C10M137/14—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having a phosphorus-to-carbon bond containing sulfur
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- C10M139/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing atoms of elements not provided for in groups C10M127/00 - C10M137/00
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- C10M143/00—Lubricating compositions characterised by the additive being a macromolecular hydrocarbon or such hydrocarbon modified by oxidation
- C10M143/06—Lubricating compositions characterised by the additive being a macromolecular hydrocarbon or such hydrocarbon modified by oxidation containing butene
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- C10M145/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C10M145/10—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate
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- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
- C10M2203/02—Well-defined aliphatic compounds
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- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
- C10M2203/02—Well-defined aliphatic compounds
- C10M2203/022—Well-defined aliphatic compounds saturated
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Abstract
TITLE: LUBRICANT COMPOSITIONS
INVENTOR: Zenowie Michael Holubec ABSTRACT OF THE DISCLOSURE:
Oil compositions useful as lubricants and multi-graded between SAE 75W and SAE 250 can be made by combining about 95 to about 30 weight percent of a base oil consisting of an oil having a viscosity of about 40 to 2000 SUS at 100°F., about 5 to about 70 weight percent of at least one oil-soluble polymer, said polymer being exemplified by a homopolymer of a non-aromatic monoolefin having at least three carbon atoms, and an extreme pressure improving amount of at least one extreme pressure agent.
INVENTOR: Zenowie Michael Holubec ABSTRACT OF THE DISCLOSURE:
Oil compositions useful as lubricants and multi-graded between SAE 75W and SAE 250 can be made by combining about 95 to about 30 weight percent of a base oil consisting of an oil having a viscosity of about 40 to 2000 SUS at 100°F., about 5 to about 70 weight percent of at least one oil-soluble polymer, said polymer being exemplified by a homopolymer of a non-aromatic monoolefin having at least three carbon atoms, and an extreme pressure improving amount of at least one extreme pressure agent.
Description
FIELD OF T~3 INVENTION
This invention concerns lubricating oil compo-sitions which are especially adapted for use in mechanical systems where gears are subjected to great stresses and extremely high pressures such as those found in automotive rear axles and tractor transmissions. In particular, the invention concerns a gear lubricant comprising in combina~
tion a base oil, at least one polymer of specified structure and molecular weightJ and at least one extreme pressure or load-carrying agent.
~3ACKGROI~ND OF THE INVENTION
The problems associated with the lubrication of automotive rear axle and transmission gears are well known to those of skill in the art. Such gears are usually hypoid in nature and for reasons inherent in their design develop great pressures between the contacting metal surfaces of the gear. These pressures literally squeeze out ordinary mineral oil lubricants from between the gears and result in metal-to-metal contact between the parts of the gear under extreme high pressures. Such metal-to-metal contact soon leads to deformation and destruction of the gear surfaces.
To alleviate these and other problems it has become a common practice to add to gear oils certain chemical substances which are generally called additives.
Among such additives are extreme pressure agents which are widely believed to react with the metal surfaces of the gear under the elevated temperatures and high pressures generally encountered during operation of the gear to form thin films. These newly formed layers act as separants ~0433ZZ
and lubricants for the gear surfaces and thus prevent or reduce destructive metal-to-metal contact.
~ecently a demand has arisen for lubricants which will function satisfactorily as gear lubricants under a wide range of temperature conditions Such compositions are characterized by a relatively small change in their viscosity with changing temperature and they are commonly graded according to SAE standards according to their viscosities at low (e.g., 0F.) and high temperatures (e.g., 210F.).
Because of this grading, such gear oils are often said to be "multigraded." In terms of widely accepted concepts such multigraded gear lubricants can also be said to have high viscosity indices. Multigraded gear lubricants thus have the desirable property of being able to function immediatelyJ though cold, upon being put into service and continue to function satisfactorily as they become heated during operation.
In addition to being multigraded, it is desirable that lubricant compositions especially adapted for use as
This invention concerns lubricating oil compo-sitions which are especially adapted for use in mechanical systems where gears are subjected to great stresses and extremely high pressures such as those found in automotive rear axles and tractor transmissions. In particular, the invention concerns a gear lubricant comprising in combina~
tion a base oil, at least one polymer of specified structure and molecular weightJ and at least one extreme pressure or load-carrying agent.
~3ACKGROI~ND OF THE INVENTION
The problems associated with the lubrication of automotive rear axle and transmission gears are well known to those of skill in the art. Such gears are usually hypoid in nature and for reasons inherent in their design develop great pressures between the contacting metal surfaces of the gear. These pressures literally squeeze out ordinary mineral oil lubricants from between the gears and result in metal-to-metal contact between the parts of the gear under extreme high pressures. Such metal-to-metal contact soon leads to deformation and destruction of the gear surfaces.
To alleviate these and other problems it has become a common practice to add to gear oils certain chemical substances which are generally called additives.
Among such additives are extreme pressure agents which are widely believed to react with the metal surfaces of the gear under the elevated temperatures and high pressures generally encountered during operation of the gear to form thin films. These newly formed layers act as separants ~0433ZZ
and lubricants for the gear surfaces and thus prevent or reduce destructive metal-to-metal contact.
~ecently a demand has arisen for lubricants which will function satisfactorily as gear lubricants under a wide range of temperature conditions Such compositions are characterized by a relatively small change in their viscosity with changing temperature and they are commonly graded according to SAE standards according to their viscosities at low (e.g., 0F.) and high temperatures (e.g., 210F.).
Because of this grading, such gear oils are often said to be "multigraded." In terms of widely accepted concepts such multigraded gear lubricants can also be said to have high viscosity indices. Multigraded gear lubricants thus have the desirable property of being able to function immediatelyJ though cold, upon being put into service and continue to function satisfactorily as they become heated during operation.
In addition to being multigraded, it is desirable that lubricant compositions especially adapted for use as
2~ gear lubricants exhibit shear stability. This means that they will not degrade or lose their viscosity as a result of the shearing forces encountered during their use.
Compositions exhibiting desirable shear stability will be found to generally have a viscosity within 85 to 95~ of their original viscosity after many hours (say 1000) of service. It has been recognized that many ordinary viscosity index improvers commonly added to crankcase lubricating oils, such as high molecular weight polyisobutylene and polyacrylates, do not possess the desired shear stability for use in improving the viscosity properties of gear lubricants.
~04332Z
It has now been found that, multigrade lubri-cants exhibiting exceptional shear stabilities can be made by combining in certain proportions base oils, polymers of specified structure and molecular weight and extreme pressure agents.
SUMMARY OF THE INVENTION
The lubricants of the present invention comprise (A) about 95 to about 30, preferably about 90 to about 50, weight percent of a base oil (B) at least one extreme pressure agent in an amount sufficient to improve the extreme pressure properties thereof, and (C) about 5 to about 70 weight percent of at least one oil-soluble polymer, said polymer being a homopolymer of a non-aromatic mono-olefin having at least three carbon atoms and having a number average molecular weight (Mn) of about 750 to about 10,000, and present in an amount sufficient to make the lubricant SAE multigraded between SAE 75W and SAE 250.
DESCRIPTION OF SPECIFIC EMBODIMENTS
The base oils of the present invention, that is, component (A), have viscosities of about 40 to about 2000 SUS (Saybolt Universal Seconds) at 100F. Preferably they have viscosities of about 75 to about 500 SUS at 100F., and most preferably of about 100 to about 300 SUS at 100F.
These base oils may be natural oils, synthetic oils, or they can be combinations of two or more of these types of oils;
e.g., combinations of different natural oils, combinations of different synthetic oils, or combinations of one or more natural oils with one or more synthetic oils. Selection of materials suitable as base oils is within the skill of the art using the parameters herein set forth.
When the base oil is a mixture of natural and synthetic oils, the mixture contains about 5 to about 95 weight percent of at least one synthetic oil. Preferably such mixtures contain ~0 to about 90% natural oil and 60 to about 10% synthetic oil. Of course, both the natural oils and synthetic oils can themselves be mixtures of various types of natural oils or synthetic oils.
When the base oil consists of natural oils, they are often derived from petroleum, although oils derived from other natural sources such as shale, coal, animals and plants can also be used. Among the general types of petroleum oils useful in the compositions of this invention are solvent neutrals, bright stocks, cylinder stocks, residual oils, hydrocracked base stocks, paraffin oils including pale oils, and solvent extracted naphthenic oils. Such oils and blends of them are produced by a number of conventional techniques which are widely known by those of skill in the art. All that is required of oils useful in this invention is that they have viscosities falling within the above-noted ranges which enable the final composition to have the below-recited SAE multigrade properties and that they be generally compatible with the other components of the gear lubricant and the materials used in construction of the gear assemblies in which they function.
As is noted above, the base oil can consist essentially of or comprise a portion of one or more synthetic oils. Among the suitable synthetic oils are homo- and inter-polymers of C2-~2 olefins, carboxylic acid esters of both monoalcohols and polyols, polyethers, silicones, polyglycols, silicates, alkylated aromatics, carbonates, thiocarbonates, orthoformates, phosphates and phosphites, borates and halo-genated hydrocarbons. Representative of such oils are homo-and interpolymers of C2 12 mono-hydrocarbyl olefins, alkylated benzenes (e.g., dodecyl benzenes, didodecyl benzenes, tetradecyl benzenes, dinonyl benzenes, di(2-ethylhexyl)benzenes, wax alkylated naphthalenes, etc.); polyphenyls (e.g. biphenyls, terphenyls, etc.); and the like.
Alkylene oxide polymers and interpolymers and derivatives thereof where the terminal hydroxyl groups have been modified by esterification, etherification, etc., constitute another class of useful synthetic oils. These are exemplified by the oils pre-pared through polymerization of alkylene oxides such as ethylene oxide or propylene oxide, and the alkyl and aryl ethers of these polyoxyalkylene polymers (e.g., methylpolyisopropylene glycol ether having an average molecular weight of 1000, diphenyl ether of polyethylene glycol having a molecular weight of 500-1000, diethyl ether of polypropylene glycol having a molecular weight of 1000-15QO, etc.) or mono- and polycarboxylic esters thereof, for example, the acetic acid esters, mixed C3-C8 fatty acid esters, or the C13 Oxo acid diester of tetraethylene glycol. Among such glycols are the polyalkylene glycols sold by the Union Carbide Corporation of New York under UCON LB-135*, UCON LB-385*, and UCON LB-1145*.
Another suitable class of synthetic oils comprises the esters of dicarboxylic acids ~e.g. phthalic acid, succinic acid, maleic acid, azeliac acid, suberic acid, sebacic acid, fumaric acid, adipic acid, linoleic acid dimer, etc.) with a variety of alcohols (e.g., butyl alcohol, hexyl alcohol, dodecyl alcohol, 2-ethylhexyl alcohol, ethylene glycol, etc.). Specific examples of these esters include dibutyl adepate, di(2-ethylhexy~ sebacate, di-n-hexyl fumarate, dioctyl sebacate, diisooctyl azelate, diisodecyl azelate, dioctyl phthalate, didecyl phthalate, di(eicosyl) sebacate, the 2-ethylhexyl diester of linoleic acid dimer, the * Trade Marks r~ .
complex ester formed by reacting one mole of sebacic acid with two moles of tetraethylene glycol and two moles of 2-ethylhexanoic acid and the like. Among the halogenated hydrocarbons useful as base oils are chlorinated phenyl and biphenyls, low molecular weight chlorotrifluoro ethylene polymers, polytetrafluoroethylenes of appropriate molecular weights, and the like.
Esters useful as synthetic oils also include those made from C5 to C12 monocarboxylic acids and polyols and polyol ethers such as neopentyl glycol, trimethylol propane, pentaerythritol, dipentaerythritol, etc.
Silicon-based oils such as the polyalkyl-, polyaryl-, polyalkoxy-, or polyaryloxy-siloxane oils and silicate oils com-prise another useful class of synthetic lubricants (e.g., tetra-ethyl silicate, tetraisopropyl silicate, tetra-(2-ethylhexyl) silicate, tetra-(4-methyl-2-tetraethyl)silicate, tetra-(p-tert-butylphenyl)silicate, hexyl-(4-methyl-2-pentoxy)-disiloxane, poly(methyl)siloxanes, poly(methylphenyl)-siloxanes, etc.).
Among these are the oils sold by the Dow Chemical Co. of Michigan, under DC-200*, DC-500*, and DC-700*. Other synthetic lubricating oils include liquid esters of phosphorus containing acids (e.g.
tricresyl phosphate, trioctyl phosphate, triphenyl phosphite, diethyl ester of decane phosphonic acid, etc.).
Organic carbonates and thiocarbonates such as those formed from the well known Oxo alcohols as well as orthoformates, mercaptals, thiolor thioformates and the like * Trade Marks D
can also be used as synthetic oils in this invention, if in the form they are used (e.g. J as blends) they exhibit viscosities within the aforesaid limits.
The fact that the base oils of this invention may consist of natural, syntheticJ or natural-synthetic blended oils does not mean that these three types of oils are necessarily equivalents of each other. Certain types of base oils may be used in certain inventive compositions for the specific properties they possess such as non-flammability or lack of corrosivity towards specific metals (e.g., silver or cadmium) which are used in certain specialized gear assemblies. In other compositions, other types of base oils may be preferred for reasons of avail-ability or low cost. Thus, the skilled artisan will recog-nize that while the three types of base oils discussed above are all useful in the compositions of the present inventionJ
they are not necessarily functional equivalents of each other in every instance.
It is preferable thatJ if the lubricants of the present invention consists essentially of only one synthe-tic base oil and only one polymerJ i.e. J component (C) J
the base oil should not be derived from the same olefin as the polymer. ThusJ for example, if the polymer is a poly-butene, it is preferable that the base oil not consist essentially of only polybutene. IfJ howeverJ the base oil is a polypropene or a mixture of polybutene and mineral oil, then the polymer can be a polybutene and so forth.
As is clear from the above discussion, in certain embodiments of this invention the synthetic oil is not solely hydrocarbyl in nature, but can contain atoms of oxygen, sulfur, siliconJ halogenJ as well as those of carbon 10433zz and hydrogen, etc.; of course, in other embodiments the synthetic oil will be solely hydrocarbyl in nature. This is also true of the natural oils used in this invention.
In many embodiments it is preferable that the synthetic oil have a number average molecular weight below about 800D Naturally, such oils must also conform to the viscosity limitations set forth above.
A second component of the gear oils of this invention, that is, component (C), is at least one oil-soluble polymer selected from the group consisting of homopolymers of non-aromatic monoolefins having at least three carbon atoms.
The characterization of these polymers as oil-soluble does not necessarily mean they are soluble in all base oils in all proportions; it means they are soluble in the base oils with which they are formulated to a degree sufficient to allow the lubricant composition to be multi-graded between SAE 75W and SAE 250. These polymers have the common property of having number average molecular weights within the range of about 750 to about 10,000;
preferably their molecular weights lie between about 900 and about 5,000.
The above-mentioned homopolymers can be prepared from non-aromatic monoolefins having at least three carbon atoms and preferably no more than twenty carbon atoms by a number of polymerization techniques well known to those of skill in the art. It should be noted that "homopolymer"
as used herein, describes polymers made from monoolefins having the same number of carbon atoms. Thus, polymers made from a mixture of butene-l and isobutylene are, in the terms of this specification and the appended claims, homo-polymers of butylene. When they contain predominantly units derived from a single isomer, they may be referred to as polymers of that isomer; but, such terminology does not exclude the possibility of the presence of a minor amount of~units derived from other isomers. Thus, a "polyisobutylene- polymer" might contain units, 80% of which are derived from isobutylene, 15% from l-butene and 5%
from 2-butene.
Particularly preferred are homopolymers made from C3 to C20 monoolefins such as propene, 2-butene, isobutene, hexene-l, decene-3, tetradecene-4, etc. More preferable are homopolymers derived from C~ to C8 l-olefins such as butene, isobutene, pentene-l, heptene-l, etc. The most preferred homopolymers are those of propene and the various butenes.
Techniques such as Ziegler, cationic, free-radical, anionic, emulsion polymerization and so forth can be used in appropriate circumstances to prepare these polymers. A particularly convenient technique for poly-merizing such olefins for use in this invention is through the use of a Lewis acid catalyst such as aluminum chloride, boron trifluoride, titanium tetrafluoride and the like.
These polymerizations are well known in the art and need not be described further at this point.
Among the polymers that are useful in the compositions of the present invention are the following: a polyisobutene of Mn 1300, a poly(l-octene) of Mn 4300, a poly (3-heptene) of Mn 900, a poly(l-eicosene) of Mn of 9500, a poly(l-nonene) of Mn 3700, a poly(2-methyl-1-pentene) of Mn 1700, a poly(5-ethyl-1-hexene) of Mn of 2200, and a poly(8 -methyl-l-tetradecene) of Mn 1900.
In general, it is preferred that ~he polymers of the present invention, i.e., component (C), for reasons of oxidative stability, contain no more than ~ive percent unsaturation on the basis of the total number of carbon-to-carbon covalent linkages present within an average molecule.
Such unsaturation can be measured by a number of means well known to those of skill in the art, such as in~rared, NMR, etc. Most preferably these polymers contain no discernable unsaturation.
A particularly preferred polymer meeting all the above requirements is polyisobutene, although other polymers such as polypropylene may also prove equally useful and desirable.
The-third co~ponent, i-e., component (B~, of the lubricant compositions of this invention, is an oil-soluble extreme pressure agent, or a combination of two or more such agents. Substances which function as extreme pressure agents in lubricating oils are of an extremely diverse nature as is well known to those of skill in the art. See, for example, the particularly useful discussions in the books "Lubricant Additives" by C.V. Smalheer and R.
Kennedy Smith (Lezius-Hiles Co. Publishers, Cleveland, Ohio, 1967), pages 9 et seq.; "Gear and Transrnission Lubricants", by C.T. Boner (Reinhold Publishing Corp., New York, 1964), pages 85-100; and "Lubricant Additives" by M.W. Ranney (Noyes Data Corporation, New Jersey, 197~), pages 146-221. These publications discuss how to make and/or use extreme pressure agents as well as discuss the state of the art with regard to extreme pressure agents.
Among the types of compounds known by those B -lo-skilled in the art to be useful as extreme pressure agents in the lubricating compos:itions and, thereforc, useful as component (B) of this invention, are organo-boron, organo-sulfur, or~a3l0-halogen, organo-halosulfur, organo-phosphorus, organo-halophosphorus, and organo-thiophcsphorus compounds as well as esters, amides, and salts of phosphorus and car-boxylic acids and oil-soluble molybdenum-containing complexes such as those disclosed in U.S. patent 3,5~1,014.
Each of these types of compounds can be exemplified by the following:
(1) Borate esters of C 1-8 alkanols and adducts pre-pared by reaction of succinimides of polyalkylene amines and boric acid. Specific examples inc]ude trioctyl borate and the adduct formed by reaction of boric acid with a polyisobutenyl succinimide of-tetraethylene pentamine.
(2) Sulfurized olefinsl sulfurized fatty acid esters of both natural (e.g., sperm oil) and synthetic origins, trithiones, thienyl derivatives, sulfurized terpenes, sulfurized oligomers of C2-8 monoolefins, xanthates of alkanols and other organo-hydroxy compounds such as phenols, thiocarbamates made from alkyl amines and other organo amines, etc.; sulfurized Diels-Alder adducts such as those disclosed in U.S. reissue patent RE 27,331. Specific examples include sulfurized polyisobutene of Mn 1100, sulfurized triisobutene, dicyclohexyl disulfide, diphenyl - and dibenzyl disulfide, etc.
Compositions exhibiting desirable shear stability will be found to generally have a viscosity within 85 to 95~ of their original viscosity after many hours (say 1000) of service. It has been recognized that many ordinary viscosity index improvers commonly added to crankcase lubricating oils, such as high molecular weight polyisobutylene and polyacrylates, do not possess the desired shear stability for use in improving the viscosity properties of gear lubricants.
~04332Z
It has now been found that, multigrade lubri-cants exhibiting exceptional shear stabilities can be made by combining in certain proportions base oils, polymers of specified structure and molecular weight and extreme pressure agents.
SUMMARY OF THE INVENTION
The lubricants of the present invention comprise (A) about 95 to about 30, preferably about 90 to about 50, weight percent of a base oil (B) at least one extreme pressure agent in an amount sufficient to improve the extreme pressure properties thereof, and (C) about 5 to about 70 weight percent of at least one oil-soluble polymer, said polymer being a homopolymer of a non-aromatic mono-olefin having at least three carbon atoms and having a number average molecular weight (Mn) of about 750 to about 10,000, and present in an amount sufficient to make the lubricant SAE multigraded between SAE 75W and SAE 250.
DESCRIPTION OF SPECIFIC EMBODIMENTS
The base oils of the present invention, that is, component (A), have viscosities of about 40 to about 2000 SUS (Saybolt Universal Seconds) at 100F. Preferably they have viscosities of about 75 to about 500 SUS at 100F., and most preferably of about 100 to about 300 SUS at 100F.
These base oils may be natural oils, synthetic oils, or they can be combinations of two or more of these types of oils;
e.g., combinations of different natural oils, combinations of different synthetic oils, or combinations of one or more natural oils with one or more synthetic oils. Selection of materials suitable as base oils is within the skill of the art using the parameters herein set forth.
When the base oil is a mixture of natural and synthetic oils, the mixture contains about 5 to about 95 weight percent of at least one synthetic oil. Preferably such mixtures contain ~0 to about 90% natural oil and 60 to about 10% synthetic oil. Of course, both the natural oils and synthetic oils can themselves be mixtures of various types of natural oils or synthetic oils.
When the base oil consists of natural oils, they are often derived from petroleum, although oils derived from other natural sources such as shale, coal, animals and plants can also be used. Among the general types of petroleum oils useful in the compositions of this invention are solvent neutrals, bright stocks, cylinder stocks, residual oils, hydrocracked base stocks, paraffin oils including pale oils, and solvent extracted naphthenic oils. Such oils and blends of them are produced by a number of conventional techniques which are widely known by those of skill in the art. All that is required of oils useful in this invention is that they have viscosities falling within the above-noted ranges which enable the final composition to have the below-recited SAE multigrade properties and that they be generally compatible with the other components of the gear lubricant and the materials used in construction of the gear assemblies in which they function.
As is noted above, the base oil can consist essentially of or comprise a portion of one or more synthetic oils. Among the suitable synthetic oils are homo- and inter-polymers of C2-~2 olefins, carboxylic acid esters of both monoalcohols and polyols, polyethers, silicones, polyglycols, silicates, alkylated aromatics, carbonates, thiocarbonates, orthoformates, phosphates and phosphites, borates and halo-genated hydrocarbons. Representative of such oils are homo-and interpolymers of C2 12 mono-hydrocarbyl olefins, alkylated benzenes (e.g., dodecyl benzenes, didodecyl benzenes, tetradecyl benzenes, dinonyl benzenes, di(2-ethylhexyl)benzenes, wax alkylated naphthalenes, etc.); polyphenyls (e.g. biphenyls, terphenyls, etc.); and the like.
Alkylene oxide polymers and interpolymers and derivatives thereof where the terminal hydroxyl groups have been modified by esterification, etherification, etc., constitute another class of useful synthetic oils. These are exemplified by the oils pre-pared through polymerization of alkylene oxides such as ethylene oxide or propylene oxide, and the alkyl and aryl ethers of these polyoxyalkylene polymers (e.g., methylpolyisopropylene glycol ether having an average molecular weight of 1000, diphenyl ether of polyethylene glycol having a molecular weight of 500-1000, diethyl ether of polypropylene glycol having a molecular weight of 1000-15QO, etc.) or mono- and polycarboxylic esters thereof, for example, the acetic acid esters, mixed C3-C8 fatty acid esters, or the C13 Oxo acid diester of tetraethylene glycol. Among such glycols are the polyalkylene glycols sold by the Union Carbide Corporation of New York under UCON LB-135*, UCON LB-385*, and UCON LB-1145*.
Another suitable class of synthetic oils comprises the esters of dicarboxylic acids ~e.g. phthalic acid, succinic acid, maleic acid, azeliac acid, suberic acid, sebacic acid, fumaric acid, adipic acid, linoleic acid dimer, etc.) with a variety of alcohols (e.g., butyl alcohol, hexyl alcohol, dodecyl alcohol, 2-ethylhexyl alcohol, ethylene glycol, etc.). Specific examples of these esters include dibutyl adepate, di(2-ethylhexy~ sebacate, di-n-hexyl fumarate, dioctyl sebacate, diisooctyl azelate, diisodecyl azelate, dioctyl phthalate, didecyl phthalate, di(eicosyl) sebacate, the 2-ethylhexyl diester of linoleic acid dimer, the * Trade Marks r~ .
complex ester formed by reacting one mole of sebacic acid with two moles of tetraethylene glycol and two moles of 2-ethylhexanoic acid and the like. Among the halogenated hydrocarbons useful as base oils are chlorinated phenyl and biphenyls, low molecular weight chlorotrifluoro ethylene polymers, polytetrafluoroethylenes of appropriate molecular weights, and the like.
Esters useful as synthetic oils also include those made from C5 to C12 monocarboxylic acids and polyols and polyol ethers such as neopentyl glycol, trimethylol propane, pentaerythritol, dipentaerythritol, etc.
Silicon-based oils such as the polyalkyl-, polyaryl-, polyalkoxy-, or polyaryloxy-siloxane oils and silicate oils com-prise another useful class of synthetic lubricants (e.g., tetra-ethyl silicate, tetraisopropyl silicate, tetra-(2-ethylhexyl) silicate, tetra-(4-methyl-2-tetraethyl)silicate, tetra-(p-tert-butylphenyl)silicate, hexyl-(4-methyl-2-pentoxy)-disiloxane, poly(methyl)siloxanes, poly(methylphenyl)-siloxanes, etc.).
Among these are the oils sold by the Dow Chemical Co. of Michigan, under DC-200*, DC-500*, and DC-700*. Other synthetic lubricating oils include liquid esters of phosphorus containing acids (e.g.
tricresyl phosphate, trioctyl phosphate, triphenyl phosphite, diethyl ester of decane phosphonic acid, etc.).
Organic carbonates and thiocarbonates such as those formed from the well known Oxo alcohols as well as orthoformates, mercaptals, thiolor thioformates and the like * Trade Marks D
can also be used as synthetic oils in this invention, if in the form they are used (e.g. J as blends) they exhibit viscosities within the aforesaid limits.
The fact that the base oils of this invention may consist of natural, syntheticJ or natural-synthetic blended oils does not mean that these three types of oils are necessarily equivalents of each other. Certain types of base oils may be used in certain inventive compositions for the specific properties they possess such as non-flammability or lack of corrosivity towards specific metals (e.g., silver or cadmium) which are used in certain specialized gear assemblies. In other compositions, other types of base oils may be preferred for reasons of avail-ability or low cost. Thus, the skilled artisan will recog-nize that while the three types of base oils discussed above are all useful in the compositions of the present inventionJ
they are not necessarily functional equivalents of each other in every instance.
It is preferable thatJ if the lubricants of the present invention consists essentially of only one synthe-tic base oil and only one polymerJ i.e. J component (C) J
the base oil should not be derived from the same olefin as the polymer. ThusJ for example, if the polymer is a poly-butene, it is preferable that the base oil not consist essentially of only polybutene. IfJ howeverJ the base oil is a polypropene or a mixture of polybutene and mineral oil, then the polymer can be a polybutene and so forth.
As is clear from the above discussion, in certain embodiments of this invention the synthetic oil is not solely hydrocarbyl in nature, but can contain atoms of oxygen, sulfur, siliconJ halogenJ as well as those of carbon 10433zz and hydrogen, etc.; of course, in other embodiments the synthetic oil will be solely hydrocarbyl in nature. This is also true of the natural oils used in this invention.
In many embodiments it is preferable that the synthetic oil have a number average molecular weight below about 800D Naturally, such oils must also conform to the viscosity limitations set forth above.
A second component of the gear oils of this invention, that is, component (C), is at least one oil-soluble polymer selected from the group consisting of homopolymers of non-aromatic monoolefins having at least three carbon atoms.
The characterization of these polymers as oil-soluble does not necessarily mean they are soluble in all base oils in all proportions; it means they are soluble in the base oils with which they are formulated to a degree sufficient to allow the lubricant composition to be multi-graded between SAE 75W and SAE 250. These polymers have the common property of having number average molecular weights within the range of about 750 to about 10,000;
preferably their molecular weights lie between about 900 and about 5,000.
The above-mentioned homopolymers can be prepared from non-aromatic monoolefins having at least three carbon atoms and preferably no more than twenty carbon atoms by a number of polymerization techniques well known to those of skill in the art. It should be noted that "homopolymer"
as used herein, describes polymers made from monoolefins having the same number of carbon atoms. Thus, polymers made from a mixture of butene-l and isobutylene are, in the terms of this specification and the appended claims, homo-polymers of butylene. When they contain predominantly units derived from a single isomer, they may be referred to as polymers of that isomer; but, such terminology does not exclude the possibility of the presence of a minor amount of~units derived from other isomers. Thus, a "polyisobutylene- polymer" might contain units, 80% of which are derived from isobutylene, 15% from l-butene and 5%
from 2-butene.
Particularly preferred are homopolymers made from C3 to C20 monoolefins such as propene, 2-butene, isobutene, hexene-l, decene-3, tetradecene-4, etc. More preferable are homopolymers derived from C~ to C8 l-olefins such as butene, isobutene, pentene-l, heptene-l, etc. The most preferred homopolymers are those of propene and the various butenes.
Techniques such as Ziegler, cationic, free-radical, anionic, emulsion polymerization and so forth can be used in appropriate circumstances to prepare these polymers. A particularly convenient technique for poly-merizing such olefins for use in this invention is through the use of a Lewis acid catalyst such as aluminum chloride, boron trifluoride, titanium tetrafluoride and the like.
These polymerizations are well known in the art and need not be described further at this point.
Among the polymers that are useful in the compositions of the present invention are the following: a polyisobutene of Mn 1300, a poly(l-octene) of Mn 4300, a poly (3-heptene) of Mn 900, a poly(l-eicosene) of Mn of 9500, a poly(l-nonene) of Mn 3700, a poly(2-methyl-1-pentene) of Mn 1700, a poly(5-ethyl-1-hexene) of Mn of 2200, and a poly(8 -methyl-l-tetradecene) of Mn 1900.
In general, it is preferred that ~he polymers of the present invention, i.e., component (C), for reasons of oxidative stability, contain no more than ~ive percent unsaturation on the basis of the total number of carbon-to-carbon covalent linkages present within an average molecule.
Such unsaturation can be measured by a number of means well known to those of skill in the art, such as in~rared, NMR, etc. Most preferably these polymers contain no discernable unsaturation.
A particularly preferred polymer meeting all the above requirements is polyisobutene, although other polymers such as polypropylene may also prove equally useful and desirable.
The-third co~ponent, i-e., component (B~, of the lubricant compositions of this invention, is an oil-soluble extreme pressure agent, or a combination of two or more such agents. Substances which function as extreme pressure agents in lubricating oils are of an extremely diverse nature as is well known to those of skill in the art. See, for example, the particularly useful discussions in the books "Lubricant Additives" by C.V. Smalheer and R.
Kennedy Smith (Lezius-Hiles Co. Publishers, Cleveland, Ohio, 1967), pages 9 et seq.; "Gear and Transrnission Lubricants", by C.T. Boner (Reinhold Publishing Corp., New York, 1964), pages 85-100; and "Lubricant Additives" by M.W. Ranney (Noyes Data Corporation, New Jersey, 197~), pages 146-221. These publications discuss how to make and/or use extreme pressure agents as well as discuss the state of the art with regard to extreme pressure agents.
Among the types of compounds known by those B -lo-skilled in the art to be useful as extreme pressure agents in the lubricating compos:itions and, thereforc, useful as component (B) of this invention, are organo-boron, organo-sulfur, or~a3l0-halogen, organo-halosulfur, organo-phosphorus, organo-halophosphorus, and organo-thiophcsphorus compounds as well as esters, amides, and salts of phosphorus and car-boxylic acids and oil-soluble molybdenum-containing complexes such as those disclosed in U.S. patent 3,5~1,014.
Each of these types of compounds can be exemplified by the following:
(1) Borate esters of C 1-8 alkanols and adducts pre-pared by reaction of succinimides of polyalkylene amines and boric acid. Specific examples inc]ude trioctyl borate and the adduct formed by reaction of boric acid with a polyisobutenyl succinimide of-tetraethylene pentamine.
(2) Sulfurized olefinsl sulfurized fatty acid esters of both natural (e.g., sperm oil) and synthetic origins, trithiones, thienyl derivatives, sulfurized terpenes, sulfurized oligomers of C2-8 monoolefins, xanthates of alkanols and other organo-hydroxy compounds such as phenols, thiocarbamates made from alkyl amines and other organo amines, etc.; sulfurized Diels-Alder adducts such as those disclosed in U.S. reissue patent RE 27,331. Specific examples include sulfurized polyisobutene of Mn 1100, sulfurized triisobutene, dicyclohexyl disulfide, diphenyl - and dibenzyl disulfide, etc.
(3) Chlorinated waxes of both the paraffinic and microcrystalline type, polyhaloaromatics such as di- and trichlorobenzene, trifluoromethyl naphthalenes, perchloro-benzene, pentachlorophenol, dichloro diphenyl trichloro-.~
~04;~32Z
ethane, etc.
~04;~32Z
ethane, etc.
(4) Chlorosulfurized olefins and olefinic waxes, ~ulfurized chlorophenyl methyl chlorideR, chloroxanthates, etc.; specific examples include chlorodibenzyl disulfide, chlorosulfurized polyisobutene of ~n 600, chlorosulfurized pinene and lard oil, etc.
(5) Trialkyl and triaryl phosphites, phosphonates and phosphates, dihydrocarbyl phosphites, etc.; such as tricre~yl phosphate, tributyl phosphite, tris(2-chloroethyl)phosphate and phosphite, dibutyl trichloromethyl phosphonates, di(n-butyl) phosphite, tolyl phosphinic acid dipropyl ester, etc.
(6) Metal dithio dihydrocarbyl phosphates, particularly tho~e of lead and zinc,phosphorus pentasulfideolefin reaction product~, esters of dithiophosphorus acids, esters and salts of thio and dithiopho~phates, etc. Specific examples include lead, zinc and sodium dioctyl dithiophosphates, lead and zinc dibenzyl dithio-phosphatec, etc.
(7) Reaction product~ of olefin oxides (e.g., ethylene and propylene oxide) and pho~phoru~ halides oxyhalides or thiohalides, reaction product~ of pho~phites and chloral or bromal, chloro-and bromo-alkyl phosphites and phosphates and amine salts thereof, etc.
(8) Pho~phate salts of amine~, ammonia and metal~, analogous phosphonic acid derivatives, neutral phosphite~, pho~phonites, phosphates and phosphonate~ and their thioanalogs, etc. Specific examples include the dihexyl ammonium salt of trichloromethane phosphonic acid, the diethyl hexyl ammonium salt of dioctyl dithiophosphate, etc.
(9) Fatty acids, dimerized and trimerized unsaturated natural acids (e.g., linoleic) and esters, amine, amrnonia, and metal (particular]y lead) salts thereof, and aMides and imidazoline salt and condensation products thereof, oxa-zolinesJ and esters o~ fatty acids, such as amrnonium di-(linoleic) acid, lard oil, oleic acid, animal glycerides, lead stearate, etc.
Many of these extreme pressure agents and further - specifiC examFles are described in detail in the afore-mentioned books, "Lubricant Additives" and "Gear and Transmission Lubricants".
Particular classes of extreme pressure agents useful in this invention are the sulfurized hydrocarbons and organo-thiophosphonyl salts, and mixtures of such com-pounds. The preparation of such compounds is well known in the art. See, for example, the disclosures of U.S.
Patents 3,231,558 and 3,197,405~ and the above-noted books~ In brief, the organo-sulfur compounds are made by reacting an organic-material such as isobutylene with a halosulfurizing agent such as æulfur monochloride and subsequently treatingt~
intermediate formed with a sulfurizing agent such as sodium sulfide or polysulfide to produce the desired organo-sulfur extreme pressure agent The organo-thiophosphorus compounds are conveniently made by reacting a phosphorus sulfide (e.g., P~S10) with a rnercaptan or alcohol.
At least one of the afore-described extreme pressure agents is present in the compositions of this invention in an amount sufficient to improve the extreme pressure properties of the composition. In general, this amount will be about 0.25 to about 20 weight percent of the total composition. More preferably, it ranges from about B
lU433ZZ
0,5 to about 10 weight percent of the total composition.
Often it is desirable to use combinations of two or more of the above-described extreme pressure agents.
Such combinations can include mixtures of two or more compounds selected from a single class, or compounds selected from two or more classes of extreme pressure agents. What-ever the particular combination is, howeverJ the total amount of extreme pressure agent will fall within the above-recited ranges.
Lubricating oils for gears can be classified according to a scheme introduced by the American Society of Automotive Engineers (SAE). According to this so-called SAE classification such lubricating oils are classified into two groups on the basis of their minimum viscosities at 210F.J (98C). These groups are the winter grades and the normal grades. Each of the two groups is divided into a number of classes. The classes of the winter - grades are indicated with the letter W preceded by a number, e.g. J a 75WJ 80W or 85W oil. The winter grades have a specified minimum viscosity at 210F. The classes of the normal grades are indicated by a number onlyJ viz. a 90J
140 or 250 oil. The normal grades must have a viscosity at 210F. within a specified range. GenerallyJ oils complying to a certain winter grade do not comply with the viscosity requirement for any normal grade as wellJ andJ converselyJ
oils complying to a certain normal grade do not comply with the viscosity requirement for a winter grade. Lubri-cating oils that fall within one SAE class only (viz.
either comply with a normal or a winter grade) are designated 3 as single-grade lubricating oils. Examples of widely used single-grade lubricating oils are SAE 75W and SAE 90 oils.
~ l4~
Many of these extreme pressure agents and further - specifiC examFles are described in detail in the afore-mentioned books, "Lubricant Additives" and "Gear and Transmission Lubricants".
Particular classes of extreme pressure agents useful in this invention are the sulfurized hydrocarbons and organo-thiophosphonyl salts, and mixtures of such com-pounds. The preparation of such compounds is well known in the art. See, for example, the disclosures of U.S.
Patents 3,231,558 and 3,197,405~ and the above-noted books~ In brief, the organo-sulfur compounds are made by reacting an organic-material such as isobutylene with a halosulfurizing agent such as æulfur monochloride and subsequently treatingt~
intermediate formed with a sulfurizing agent such as sodium sulfide or polysulfide to produce the desired organo-sulfur extreme pressure agent The organo-thiophosphorus compounds are conveniently made by reacting a phosphorus sulfide (e.g., P~S10) with a rnercaptan or alcohol.
At least one of the afore-described extreme pressure agents is present in the compositions of this invention in an amount sufficient to improve the extreme pressure properties of the composition. In general, this amount will be about 0.25 to about 20 weight percent of the total composition. More preferably, it ranges from about B
lU433ZZ
0,5 to about 10 weight percent of the total composition.
Often it is desirable to use combinations of two or more of the above-described extreme pressure agents.
Such combinations can include mixtures of two or more compounds selected from a single class, or compounds selected from two or more classes of extreme pressure agents. What-ever the particular combination is, howeverJ the total amount of extreme pressure agent will fall within the above-recited ranges.
Lubricating oils for gears can be classified according to a scheme introduced by the American Society of Automotive Engineers (SAE). According to this so-called SAE classification such lubricating oils are classified into two groups on the basis of their minimum viscosities at 210F.J (98C). These groups are the winter grades and the normal grades. Each of the two groups is divided into a number of classes. The classes of the winter - grades are indicated with the letter W preceded by a number, e.g. J a 75WJ 80W or 85W oil. The winter grades have a specified minimum viscosity at 210F. The classes of the normal grades are indicated by a number onlyJ viz. a 90J
140 or 250 oil. The normal grades must have a viscosity at 210F. within a specified range. GenerallyJ oils complying to a certain winter grade do not comply with the viscosity requirement for any normal grade as wellJ andJ converselyJ
oils complying to a certain normal grade do not comply with the viscosity requirement for a winter grade. Lubri-cating oils that fall within one SAE class only (viz.
either comply with a normal or a winter grade) are designated 3 as single-grade lubricating oils. Examples of widely used single-grade lubricating oils are SAE 75W and SAE 90 oils.
~ l4~
10~3 3 2Z
On the other hand, lubricating oils which do in fact comply with the speci~ication of both a winter grade and a normal grade are designated as multigrade lubricating oils.
It is a particular feature of the compositions of this invention that they may be multigraded according to SAE standards within the multigrade range lying between SAE 75w and SAE 250 This means that the compositions have viscosities which allow them to be characterized as multi-grade; that is, they may be, for example, SAE 75w/85w, SAE go/250, SAE 85W/140 and so forth. The viscosity pro-perties required to be exhibited by compositions meeting such standards are summarized in the following table:
SAE SAE SAE SAE SAE SAE
75W 80w 8~w 90 l40 2 vis.~ 210F(99C) (a) Min. cSt~(b)4.2 7.0 11 o 14.0 25.0 43. o Max cSt no rea.no req.no req. 25.0 43.0 no req.
Min SUS (c)40.0 49. o 63. o 74.0 120.0 200.0 Max. SUS) no req.no req.no req. 120.0 200.0 no req.
(a) Viscosities determined by ASTM D-445 procedure as set forth by the American Society for Testing and Materials, 1916 Race Street, Philadelphia, Pa. 19103, u. s .A.
(b) Centistokes (c) Saybolt Universal Seconds _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Thus the lower SAE value is the minimum viscosity the oil can have (and still meet the standard), while the upper value is the maximum viscosity the oil can have. For example, an oil multigraded as SAE 75W/go has (as the data in Table I shows) a minimum viscosity of 4.2 cSt(or 40 sus) at 210qF. and a maximum viscosity o~ 25 cSt (or 120 SUS) at 210F., while an oil multigraded as SAE go/140 has a minimum viscosity of 14.0 cSt (or 74.0 sus) and a maximum viscosity of 43.0 cSt (or 200 SUS), both measured at 210~.
It is these viscosity properties which make the compositions of this invention especially useful since they can function satisfactorily over a wide range of tempera-tures. Thus, the compositions can function to lubricate a gear at extremely cold temperatures during start-up or while flying at high altitude and still maintain satisfac-tory lubricating properties well after operation of the gear has resulted in a substantial increase in temperature or the gear-containing device has returned to a warm environment.
Many of the preferred embodiments of this inven-tion are also characterized by properties which permit them to conform with the requirements of MIL-L-2105B specifica-tions promulgated by the U.S. Government for gear lubricants.
They thus possess adequate properties with respect to foaming, thermal and oxidative stability, water separation, compa-tability and copper corrosion.
In addition to the three essential components discussed above, the compositions of this invention can also include other conventional lubricant additives which confer a variety of beneficial properties upon the composition.
Such additives as antiwear agents and additives to improve the load-carrying properties of lubricants such as tri-hydrocarbyl phosphates or metal, particularly zinc hydrocar-byl dithiophosphates; antioxidants such as hindered alkyl phenols (e.g., 2,6-Di-t-butyl-4-methyl phenol); rust inhibitors such as alkylated succinic acids and anhydrides or calcium, barium or sodium sulfonates; ashless detergent/
dispersants such as those noted below; ash-forming deter-gent/dispersants such as metal phenates and sulfonates;
~0433ZZ
anti-foaming agents, such as silicones, anti-friction agents~ such as stearyl alcohol or stearyl cyanide; dyes, metal deactivators and so forth may be included in appro-priate amounts, in the composition of this invention.
Among the ashless detergent/dispersants which can be used to advantage in the oil compositions of this inven-tion are those which are I`o~med by reaction of a mono-alcohol or polyol with a high molecular weight mono- or polycarboxylic acid acylating agent containing at least thirty carbon atoms in the acyl moiety. Such ester compo-sitions are well known to those of skill in the art. See, for example, French Patent Specification 1,396,645, British Patent Specifications 981,850; 1,055,337; and 1,306,529 as well as U.S. Patents 3,255,108; 3,311,588; 3,311,776;
3,346,345; 3,381,022; 3,522,179; 3,542,680;
3,576,743; 3,579,450; 3,632,510; and 3,639,242. Each of the foregoing~U.S. and foreign patent publications describe how to make and use such compositions.
Another type of particularly useful ashless dispersant is formed by the reaction of a mono- or poly-carboxylic acid acylating agent with polyamines. Other related useful dispersants can be prepared by post-treating such dispersants with alkoxides, cyanides, etc. See,for example, U.S. Patents, RE 26,433; 3,172,892; 3,216,936;
3,219,666; 3,256,185; 3,272,746; 3,278,550; 3,306,493;
3,341,542; 3,366,569; 3,373,111; 3,374,171~; 3,502,677;
3,541,012. Other useful ashless dispersan-ts are formed by the ~eaction of a halogenated polymer with a polyalkylene polyamine. Such dispersants are described in U.S. Patents 3,573,010; 3,574,576; 3,438,757; 3,565,804;and ~,565,492.
, ~ ~ -17-Still other ashless dispersants are formed by reaction of an alkylated phenol, a lower aldehyde and an amine or polyamine via the well-known Mannich reactionO Tlle preparation of such materials in lubricants are disclosed in UOS~ Patents 3,036,003; 3,368,972; 3,413,347, 3,448,047;
3,539, 633; and 3, 649,2290 A particularly useful type of additive often included in compositions of this invention is one or more pour point depressants. The use of such pour point depres-sants in oil-base compositions to improve the low tempera-ture properties of the compositions is well known to the art. See, for example, the aforementioned book "Lubricant Additives" by Smalheer and Smith, page 8, and "Gear and Transmission Lubricants", pO 102, and ''Lubricant Additives"
by Ranney. Among the types of compounds which function satisfactorily as pour point depres~ants in the composi--tion of the present invention are polymethacrylates, poly-acrylates, condensation products of haloparaffin waxes and aromatic compounds, and vinyl carboxylate polymers.
A particularly useful class of pour point depressants are terpolymers made by polymerizing a dialkyl fumarate, vinyl ester of a fatty acid and a vinyl alkyl ether.
Techniques for preparing such polymers and their uses are disclosed in U.S. patent 3,250, 715. Generally, when they are present, in the compositions of this invention, the pour point depressants are present in the amount of 0.01 to about 5 weight percent of the total composition.
' Di Examples It is believed that the nature of the invention may be more accurately appreciated from a study of the following examples which are given mainly for illustrative purposes and are in no way intended to limit the scope of the claimed invention.
A number of compositions embodying the present invention are prepared by blending together the components outlined in Table II in the indicated proportions which are all percentages by weight.
The viscosity properties of these compositions are also summarized in Table II. It should be noted that where the percentages of components does not add up to 100, the balance of the composition consists of a pour point depressing terpolymer of a C12-C14 fumarate diester, ethyl vinyl ether and vinyl acetate.
The extreme pressure agents used in preparing these blends of Examples 1-10 are all commercially available mixtures comprising organo-thiophosphonyl salts and sulfurized hydrocarbons sold by The Lubrizol Corporation of Cleveland, Ohio, under Anglamol 93*, Anglamol 98A* and Anglamol 99*.
As can be seen from an examination of the data in Table II, each of the blends of Examples 1-10 is multigraded according to SAE standards between SAE 75W and SAE 250. These blends also satisfactorily lubricate automotive differential gears and exhibit outstanding shear resistant properties over prolonged use.
Lubricating oil concentrates can also be used conveniently to prepare such compositions, and are within the scope of the present invention. For example, a similar composition to that of Example 6 can be prepared by first * Trade Mark forming a concentrate of polymer, extreme pressure agent and pour point depressant in the relative amounts of 62 parts, 16 parts and l part in 21 parts of solvent neutral diluent oil (all parts by weight). Such a concentrate is then blended with an equal part of an appropriate synthetic alkylated aromatic oil to form a composition closely resembling that of Example 6.
These concentrates comprise (B) at least one of the afore-described extreme pressure agents and (C) homo-polymers, the amounts of (B) and (C) incorporated in said concentrate being such that when about 75 to about 25 parts by weight of the concentrate is blended with about 25 to 75 parts by weight of at least one natural, synthetic or synthetic-natural oil mixture having a viscosity of about 40 to about 2000 SUS at 100F., the resulting blend is a lubricating oil composition multigraded according to SAE
standards within the multigrade range of SAE 75W to SAE 250.
For example, these concentrates comprise about 15 to 70 percent of an oil (which can be natural, synthetic or a mixture of the two), about 85 to 30 percent of the afore-described polymer and about 5 to about 30 percent of the afore-descr~bed extreme pressure agents. Optionally such concentrates can also contain about 0 5 to about 5 percent of a pour point depressant.
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On the other hand, lubricating oils which do in fact comply with the speci~ication of both a winter grade and a normal grade are designated as multigrade lubricating oils.
It is a particular feature of the compositions of this invention that they may be multigraded according to SAE standards within the multigrade range lying between SAE 75w and SAE 250 This means that the compositions have viscosities which allow them to be characterized as multi-grade; that is, they may be, for example, SAE 75w/85w, SAE go/250, SAE 85W/140 and so forth. The viscosity pro-perties required to be exhibited by compositions meeting such standards are summarized in the following table:
SAE SAE SAE SAE SAE SAE
75W 80w 8~w 90 l40 2 vis.~ 210F(99C) (a) Min. cSt~(b)4.2 7.0 11 o 14.0 25.0 43. o Max cSt no rea.no req.no req. 25.0 43.0 no req.
Min SUS (c)40.0 49. o 63. o 74.0 120.0 200.0 Max. SUS) no req.no req.no req. 120.0 200.0 no req.
(a) Viscosities determined by ASTM D-445 procedure as set forth by the American Society for Testing and Materials, 1916 Race Street, Philadelphia, Pa. 19103, u. s .A.
(b) Centistokes (c) Saybolt Universal Seconds _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Thus the lower SAE value is the minimum viscosity the oil can have (and still meet the standard), while the upper value is the maximum viscosity the oil can have. For example, an oil multigraded as SAE 75W/go has (as the data in Table I shows) a minimum viscosity of 4.2 cSt(or 40 sus) at 210qF. and a maximum viscosity o~ 25 cSt (or 120 SUS) at 210F., while an oil multigraded as SAE go/140 has a minimum viscosity of 14.0 cSt (or 74.0 sus) and a maximum viscosity of 43.0 cSt (or 200 SUS), both measured at 210~.
It is these viscosity properties which make the compositions of this invention especially useful since they can function satisfactorily over a wide range of tempera-tures. Thus, the compositions can function to lubricate a gear at extremely cold temperatures during start-up or while flying at high altitude and still maintain satisfac-tory lubricating properties well after operation of the gear has resulted in a substantial increase in temperature or the gear-containing device has returned to a warm environment.
Many of the preferred embodiments of this inven-tion are also characterized by properties which permit them to conform with the requirements of MIL-L-2105B specifica-tions promulgated by the U.S. Government for gear lubricants.
They thus possess adequate properties with respect to foaming, thermal and oxidative stability, water separation, compa-tability and copper corrosion.
In addition to the three essential components discussed above, the compositions of this invention can also include other conventional lubricant additives which confer a variety of beneficial properties upon the composition.
Such additives as antiwear agents and additives to improve the load-carrying properties of lubricants such as tri-hydrocarbyl phosphates or metal, particularly zinc hydrocar-byl dithiophosphates; antioxidants such as hindered alkyl phenols (e.g., 2,6-Di-t-butyl-4-methyl phenol); rust inhibitors such as alkylated succinic acids and anhydrides or calcium, barium or sodium sulfonates; ashless detergent/
dispersants such as those noted below; ash-forming deter-gent/dispersants such as metal phenates and sulfonates;
~0433ZZ
anti-foaming agents, such as silicones, anti-friction agents~ such as stearyl alcohol or stearyl cyanide; dyes, metal deactivators and so forth may be included in appro-priate amounts, in the composition of this invention.
Among the ashless detergent/dispersants which can be used to advantage in the oil compositions of this inven-tion are those which are I`o~med by reaction of a mono-alcohol or polyol with a high molecular weight mono- or polycarboxylic acid acylating agent containing at least thirty carbon atoms in the acyl moiety. Such ester compo-sitions are well known to those of skill in the art. See, for example, French Patent Specification 1,396,645, British Patent Specifications 981,850; 1,055,337; and 1,306,529 as well as U.S. Patents 3,255,108; 3,311,588; 3,311,776;
3,346,345; 3,381,022; 3,522,179; 3,542,680;
3,576,743; 3,579,450; 3,632,510; and 3,639,242. Each of the foregoing~U.S. and foreign patent publications describe how to make and use such compositions.
Another type of particularly useful ashless dispersant is formed by the reaction of a mono- or poly-carboxylic acid acylating agent with polyamines. Other related useful dispersants can be prepared by post-treating such dispersants with alkoxides, cyanides, etc. See,for example, U.S. Patents, RE 26,433; 3,172,892; 3,216,936;
3,219,666; 3,256,185; 3,272,746; 3,278,550; 3,306,493;
3,341,542; 3,366,569; 3,373,111; 3,374,171~; 3,502,677;
3,541,012. Other useful ashless dispersan-ts are formed by the ~eaction of a halogenated polymer with a polyalkylene polyamine. Such dispersants are described in U.S. Patents 3,573,010; 3,574,576; 3,438,757; 3,565,804;and ~,565,492.
, ~ ~ -17-Still other ashless dispersants are formed by reaction of an alkylated phenol, a lower aldehyde and an amine or polyamine via the well-known Mannich reactionO Tlle preparation of such materials in lubricants are disclosed in UOS~ Patents 3,036,003; 3,368,972; 3,413,347, 3,448,047;
3,539, 633; and 3, 649,2290 A particularly useful type of additive often included in compositions of this invention is one or more pour point depressants. The use of such pour point depres-sants in oil-base compositions to improve the low tempera-ture properties of the compositions is well known to the art. See, for example, the aforementioned book "Lubricant Additives" by Smalheer and Smith, page 8, and "Gear and Transmission Lubricants", pO 102, and ''Lubricant Additives"
by Ranney. Among the types of compounds which function satisfactorily as pour point depres~ants in the composi--tion of the present invention are polymethacrylates, poly-acrylates, condensation products of haloparaffin waxes and aromatic compounds, and vinyl carboxylate polymers.
A particularly useful class of pour point depressants are terpolymers made by polymerizing a dialkyl fumarate, vinyl ester of a fatty acid and a vinyl alkyl ether.
Techniques for preparing such polymers and their uses are disclosed in U.S. patent 3,250, 715. Generally, when they are present, in the compositions of this invention, the pour point depressants are present in the amount of 0.01 to about 5 weight percent of the total composition.
' Di Examples It is believed that the nature of the invention may be more accurately appreciated from a study of the following examples which are given mainly for illustrative purposes and are in no way intended to limit the scope of the claimed invention.
A number of compositions embodying the present invention are prepared by blending together the components outlined in Table II in the indicated proportions which are all percentages by weight.
The viscosity properties of these compositions are also summarized in Table II. It should be noted that where the percentages of components does not add up to 100, the balance of the composition consists of a pour point depressing terpolymer of a C12-C14 fumarate diester, ethyl vinyl ether and vinyl acetate.
The extreme pressure agents used in preparing these blends of Examples 1-10 are all commercially available mixtures comprising organo-thiophosphonyl salts and sulfurized hydrocarbons sold by The Lubrizol Corporation of Cleveland, Ohio, under Anglamol 93*, Anglamol 98A* and Anglamol 99*.
As can be seen from an examination of the data in Table II, each of the blends of Examples 1-10 is multigraded according to SAE standards between SAE 75W and SAE 250. These blends also satisfactorily lubricate automotive differential gears and exhibit outstanding shear resistant properties over prolonged use.
Lubricating oil concentrates can also be used conveniently to prepare such compositions, and are within the scope of the present invention. For example, a similar composition to that of Example 6 can be prepared by first * Trade Mark forming a concentrate of polymer, extreme pressure agent and pour point depressant in the relative amounts of 62 parts, 16 parts and l part in 21 parts of solvent neutral diluent oil (all parts by weight). Such a concentrate is then blended with an equal part of an appropriate synthetic alkylated aromatic oil to form a composition closely resembling that of Example 6.
These concentrates comprise (B) at least one of the afore-described extreme pressure agents and (C) homo-polymers, the amounts of (B) and (C) incorporated in said concentrate being such that when about 75 to about 25 parts by weight of the concentrate is blended with about 25 to 75 parts by weight of at least one natural, synthetic or synthetic-natural oil mixture having a viscosity of about 40 to about 2000 SUS at 100F., the resulting blend is a lubricating oil composition multigraded according to SAE
standards within the multigrade range of SAE 75W to SAE 250.
For example, these concentrates comprise about 15 to 70 percent of an oil (which can be natural, synthetic or a mixture of the two), about 85 to 30 percent of the afore-described polymer and about 5 to about 30 percent of the afore-descr~bed extreme pressure agents. Optionally such concentrates can also contain about 0 5 to about 5 percent of a pour point depressant.
` ~0433ZZ
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Claims (27)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a multigraded gear oil composition comprising (A) about 95 to about 30 weight percent of a base oil having a viscosity of about 40 to about 2000 SUS at 100°F. and (B) at least one extreme pressure agent in an amount sufficient to impart extreme pressure properties thereto, the improvement in said composition comprising incorporating therein (C) about 5 to about 70 weight percent of at least one oil-soluble homopolymer of a non-aromatic monoolefin having at least 3 carbon atoms, said polymer having a number average molecular weight of about 750 to about 10,000 and present in an amount so as to allow the lubricating oil composition to be multigraded according to SAE standards in the multigrade range between SAE 75W and SAE 250, and said base oil being selected from the group consisting of natural oil, synthetic oils and mix-tures of about 5 to about 95 weight percent of at least one natural oil and about 95 to about 5 weight percent of at least one synthetic oil.
2. A composition as claimed in claim 1 wherein the base oil has a viscosity of about 75 to about 500 SUS at 100°F.
3. A composition as claimed in claim 1 wherein the base oil has a viscosity of about 100 to about 300 SUS at 100°F.
4. A composition as claimed in claim 1 wherein the amount of extreme pressure agent is from about 0.25 to about 20 weight percent of the total composition.
5. A composition as claimed in claim 4 wherein the extreme pressure agent is selected from the group consisting of organo-boron-, organo-sulfur-, organo-halo-, organo-halosulfur-, organo-phosphorus-, and organo-thiophosphorus-compounds and esters, amides and salts of phosphorus and carboxylic acids.
6. A composition as claimed in claim 5 wherein the extreme pressure agent is a mixture of organo-thiophosphonyl salts and sulfurized hydrocarbons.
7. A composition comprising the composition of claim 1 and about 0.01 to about 5 weight percent of at least one pour point depressant.
8. A composition as claimed in claim 7 wherein the pour point depressant is selected from the group consisting of poly-methacrylates, polyacrylates, condensation products of haloparaffin waxes and aromatic compounds, vinyl carboxylates and terpolymers of fumarate alkyl esters, vinyl alkyl ethers and vinyl carboxylates.
9. A composition as claimed in claim 8 wherein the pour point depressant is a terpolymer of a dialkyl fumarate, alkyl vinyl ether, and vinyl carboxylate.
10. A composition as claimed in claim 1 wherein the homo-polymer is derived from a C3-C20 olefin.
11. A composition as claimed in claim 10 wherein the polymer has a number average molecular weight of about 900 to about 5000.
12. A composition as claimed in claim 11 wherein the homo-polymer is derived from a C4-C8 1-olefin.
13. A composition as claimed in claim 12 wherein the homo-polymer is derived from propene or a butene.
14. A composition as claimed in claim 1 wherein the polymer has a number average molecular weight of about 900 to about 5000.
15. In a lubricating oil composition comprising (A) about 90 to about 50 weight percent of a base oil consisting essentially of natural oil having a viscosity of about 75 to about 500 SUS at 100°F., and (B) about 0.25 to about 20 weight percent of at least one extreme pressure agent selected from the group consisting of organo-thiophosphonyl salts, sulfurized hydrocarbons and mixtures thereof, the improvement which comprises incorporating therein (C) about 10 to about 50 weight percent of at least one oil-soluble homopolymer of a non-aromatic monoolefin having between three and twenty carbon atoms, said polymer having a number average molecular weight of about 750 to about 10,000, and present in an amount so as to allow the lubricating oil composition to be multi-graded according to SAE standards in the multigrade range between SAE 75W and SAE 250.
16. A composition as claimed in claim 15 wherein the homo-polymer is polyisobutene having a number average molecular weight of about 900 to about 5000.
17. In a lubricating oil composition comprising (A) about 90 to about 50 weight percent of a base oil having a viscosity of about 75 to about 500 SUS at 100°F., said base oil comprising a mixture of about 5 to about 95 weight percent of at least one natural oil and about 95 to about 5 weight percent of at least one synthetic oil, and (B) about 0.25 to about 20 weight percent of at least one extreme pressure agent selected from the group consisting of organo-thiophosphonyl salts, sulfurized hydrocarbons and mixtures thereof, the improvement which comprises incorporating therein (C) about 10 to about 50 weight percent of at least one oil-soluble homopolymer of a non-aromatic monoolefin having between three and twenty carbon atoms, said polymer having a number average molecular weight of about 750 to about 10,000, and present in an amount so as to allow the lubricating oil composition to be multi-graded according to SAE standards in the multigrade range between SAE 75W and SAE 250.
18. A composition as claimed in claim 17 wherein the homo-polymer is polyisobutene having a number average molecular weight of about 900 to about 5000.
19. A composition as claimed in claim 1 wherein the synthetic oil is not derived from the same olefins as the polymer.
20. A composition as claimed in claim 1 wherein the synthetic oil is not solely hydrocarbyl in composition.
21. A composition as claimed in claim 1 wherein the synthetic oil is selected from the group consisting of homopolymers and interpolymers of C2-C12 olefins, carboxylic acid esters, carbonates, thiocarbonates, orthofumarates, phosphates, phosphites, alkylated aromatics, silicones, polyglycols, polyethers, silicates, and halogenated hydrocarbons.
22. A composition as claimed in claim 1 wherein the base oil comprises about 40 to about 90 weight percent of at least one natural oil and about 60 to about 10 weight percent of at least one synthetic oil.
23. The composition as claimed in claim 1 wherein the synthetic oil has a number average molecular weight below about 800.
24. In a lubricating oil composition comprising (A) about 90 to about 50 weight percent of a base oil consisting essentially of synthetic oil having a viscosity of about 75 to about 500 SUS
at 100°F., and (B) about 0.25 to about 20 weight percent of at least one extreme pressure agent selected from the group consisting of organo-thiophosphonyl salts, sulfurized hydrocarbons and mixtures thereof, the improvement which comprises incorporating therein (C) about 10 to about 50 weight percent of at least one oil-soluble homopolymer of a non-aromatic monoolefin having between three and twenty carbon atoms, said polymer having a number average molecular weight of about 750 to about 10,000 and present in an amount so as to allow the lubricating oil composition to be multigraded according to SAE standards in the multigrade range between SAE 75W and SAE 250.
at 100°F., and (B) about 0.25 to about 20 weight percent of at least one extreme pressure agent selected from the group consisting of organo-thiophosphonyl salts, sulfurized hydrocarbons and mixtures thereof, the improvement which comprises incorporating therein (C) about 10 to about 50 weight percent of at least one oil-soluble homopolymer of a non-aromatic monoolefin having between three and twenty carbon atoms, said polymer having a number average molecular weight of about 750 to about 10,000 and present in an amount so as to allow the lubricating oil composition to be multigraded according to SAE standards in the multigrade range between SAE 75W and SAE 250.
25. A composition as claimed in claim 24 wherein the homo-polymer is polyisobutene having a number average molecular weight of about 900 to about 5000.
26. A concentrate comprising (B) an extreme pressure agent and (C) at least one oil-soluble homopolymer of non-aromatic mono-olefins having at least three carbon atoms, said polymer having a number average molecular weight of about 750 to about 10,000, the amounts of (B) and (C) incorporated in said concentrate being such that when about 75 to about 25 parts by weight of said con-centrate is blended with about 25 to about 75 parts by weight of at least one base oil of viscosity of about 40 to about 2,000 SUS
at 100°F., the resulting blend is a lubricating oil composition which incorporates about five to about 70 weight percent of (C) and which is multi-graded according to SAE standards within the multigrade range of SAE 75W to SAE 250 exhibiting extreme pressure properties, said base oil being selected from the group consisting of natural oil, synthetic oils and mixtures of about 5 to about 95 weight percent of at least one natural oil and about 95 to about 5 weight percent of at least one synthetic oil.
at 100°F., the resulting blend is a lubricating oil composition which incorporates about five to about 70 weight percent of (C) and which is multi-graded according to SAE standards within the multigrade range of SAE 75W to SAE 250 exhibiting extreme pressure properties, said base oil being selected from the group consisting of natural oil, synthetic oils and mixtures of about 5 to about 95 weight percent of at least one natural oil and about 95 to about 5 weight percent of at least one synthetic oil.
27. The concentrate claimed in claim 26 wherein there is also present about 0.5 to about 5 percent of a pour point depressant.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US40223173A | 1973-10-01 | 1973-10-01 | |
ZA00738714A ZA738714B (en) | 1973-10-01 | 1973-11-14 | Lubricant compositions |
Publications (1)
Publication Number | Publication Date |
---|---|
CA1043322A true CA1043322A (en) | 1978-11-28 |
Family
ID=27017779
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA209,981A Expired CA1043322A (en) | 1973-10-01 | 1974-09-23 | Multigrade lubricants containing non-aromatic mono-olefin polymers |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS5321686B2 (en) |
CA (1) | CA1043322A (en) |
FR (1) | FR2245757B1 (en) |
GB (1) | GB1489405A (en) |
ZA (1) | ZA738714B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5883057A (en) * | 1996-01-16 | 1999-03-16 | The Lubrizol Corporation | Lubricating compositions |
US6962895B2 (en) | 1996-01-16 | 2005-11-08 | The Lubrizol Corporation | Lubricating compositions |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1088446A (en) * | 1976-05-25 | 1980-10-28 | Polysar Limited | Mineral oil compositions |
EP0326975B1 (en) * | 1988-02-05 | 1991-07-31 | Mineralölwerke Wenzel und Weidmann Zweigniederlassung der Fuchs Mineralölwerke GmbH, Mannheim | Lubricant for traction drive with continuously variable transmission |
-
1973
- 1973-11-14 ZA ZA00738714A patent/ZA738714B/en unknown
- 1973-12-10 FR FR7343950A patent/FR2245757B1/fr not_active Expired
-
1974
- 1974-09-18 GB GB40708/74A patent/GB1489405A/en not_active Expired
- 1974-09-20 JP JP10789274A patent/JPS5321686B2/ja not_active Expired
- 1974-09-23 CA CA209,981A patent/CA1043322A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5883057A (en) * | 1996-01-16 | 1999-03-16 | The Lubrizol Corporation | Lubricating compositions |
US6962895B2 (en) | 1996-01-16 | 2005-11-08 | The Lubrizol Corporation | Lubricating compositions |
Also Published As
Publication number | Publication date |
---|---|
JPS5321686B2 (en) | 1978-07-04 |
GB1489405A (en) | 1977-10-19 |
JPS5062208A (en) | 1975-05-28 |
FR2245757A1 (en) | 1975-04-25 |
ZA738714B (en) | 1975-06-25 |
FR2245757B1 (en) | 1978-04-21 |
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