U.S. patent application number 12/781035 was filed with the patent office on 2010-09-09 for tartaric acid derivatives as fuel economy improvers and antiwear agents in crankcase oils and preparations thereof.
This patent application is currently assigned to Th Lubrizol Corporation. Invention is credited to Daniel E. Barrer, Jason R. Brown, Jody Kocsis, Patrick E. Mosier, Richard J. Vickerman, Jonathan S. Vilardo.
Application Number | 20100227784 12/781035 |
Document ID | / |
Family ID | 38222525 |
Filed Date | 2010-09-09 |
United States Patent
Application |
20100227784 |
Kind Code |
A1 |
Kocsis; Jody ; et
al. |
September 9, 2010 |
Tartaric Acid Derivatives as Fuel Economy Improvers and Antiwear
Agents in Crankcase Oils and Preparations Thereof
Abstract
Formulations using tartaric compounds of the present invention
in a low sulfur, low ash and low phosphorous lubricant lower wear,
and friction and improves fuel economy.
Inventors: |
Kocsis; Jody; (Chagrin
Falls, OH) ; Vilardo; Jonathan S.; (Chardon, OH)
; Brown; Jason R.; (Chester, GB) ; Barrer; Daniel
E.; (Richmond Heights, OH) ; Vickerman; Richard
J.; (Stow, OH) ; Mosier; Patrick E.; (Bay
Village, OH) |
Correspondence
Address: |
THE LUBRIZOL CORPORATION;ATTN: DOCKET CLERK, PATENT DEPT.
29400 LAKELAND BLVD.
WICKLIFFE
OH
44092
US
|
Assignee: |
Th Lubrizol Corporation
Wickliffe
OH
|
Family ID: |
38222525 |
Appl. No.: |
12/781035 |
Filed: |
May 17, 2010 |
Related U.S. Patent Documents
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Application
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Patent Number |
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11348031 |
Feb 6, 2006 |
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12781035 |
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10963082 |
Oct 12, 2004 |
7651987 |
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11348031 |
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Current U.S.
Class: |
508/287 ;
508/370; 508/423; 508/510 |
Current CPC
Class: |
C10M 2223/045 20130101;
C10M 2207/262 20130101; C10M 2215/086 20130101; C10M 2215/28
20130101; C10N 2030/06 20130101; C10N 2030/54 20200501; C10M
2219/046 20130101; C10M 2207/026 20130101; C10N 2030/43 20200501;
C10M 2207/028 20130101; C10M 2207/288 20130101; C10N 2030/45
20200501; C10N 2030/42 20200501; C10N 2010/04 20130101; C10M
2215/08 20130101; C10M 163/00 20130101; C10M 129/72 20130101; C10M
2215/064 20130101; C10M 2207/282 20130101; C10M 2215/082 20130101;
C10N 2040/25 20130101; C10M 129/76 20130101; C10M 133/16 20130101;
C10N 2060/14 20130101; C10M 2227/061 20130101; C10M 2215/042
20130101; C10M 2215/04 20130101; C10M 2207/289 20130101; C10M
2223/045 20130101; C10N 2010/04 20130101; C10M 2207/028 20130101;
C10N 2010/04 20130101; C10M 2207/262 20130101; C10N 2010/04
20130101; C10M 2219/046 20130101; C10N 2010/04 20130101; C10M
2223/045 20130101; C10N 2010/04 20130101; C10M 2207/028 20130101;
C10N 2010/04 20130101; C10M 2207/262 20130101; C10N 2010/04
20130101; C10M 2219/046 20130101; C10N 2010/04 20130101 |
Class at
Publication: |
508/287 ;
508/370; 508/423; 508/510 |
International
Class: |
C10M 169/04 20060101
C10M169/04; C10M 137/10 20060101 C10M137/10 |
Claims
1. A low-sulfur, low-phosphorus, low-ash lubricant composition
suitable for use in an internal combustion engine, comprising: (a)
an oil of lubricating viscosity, and (b) a condensation product of
a material represented by formula I and an alcohol or amine having
1 to about 150 carbon atoms and combinations thereof; ##STR00006##
wherein each R is independently H, or a hydrocarbyl group, or
wherein the R groups together form a ring; and wherein if R is H,
the condensation product is optionally further functionalized by
acylation or reaction with a boron compound; wherein said lubricant
composition has a sulfated ash value of up to about 1.0, a
phosphorus content of up to about 0.08 percent by weight and a
sulfur content of up to about 0.4 percent by weight.
2. The composition of claim 1, wherein the amount of the
condensation product is about 0.05 to about 5.0 percent by
weight.
3. The composition of claim 2, wherein the amount of condensation
product is about 0.1 to about 2.0 percent by weight.
4. The composition of claim 2, wherein the amount of condensation
product is about 0.25 to about 1.25 percent by weight.
5. The composition of claim 1, further comprising a metal
dialkyldithiophosphate.
6. The composition of claim 1, wherein the metal
dialkyldithiophosphate is zinc dialkyldithiophosphate wherein at
least about 50 percent of the alkyl groups thereof are secondary
alkyl groups.
7. The composition of claim 1, further comprising a dispersant.
8. The composition of claim 7, wherein the dispersant is a
succinimide.
9. The composition of claim 1, further comprising at least one
calcium overbased detergent.
10. The composition of claim 9, wherein the calcium overbased
detergent is selected from the group consisting of calcium
sulfonates, calcium phenates, calcium salicylates, calcium
salixarates and mixtures thereof.
11. The composition of claim 1, further comprising at least one
antioxidant.
12. The composition of claim 11, wherein the antioxidant is
selected from the group consisting of hindered phenols, aryl amines
and mixtures thereof.
13. The composition of claim 1, further comprising additional
friction modifiers other than (b).
14. The additional friction modifiers are selected from the group
consisting of glycerol monooleates, oleyl amides, diethanol fatty
amines and mixtures thereof.
15. The composition of claim 1, further comprising a defoamer.
16. A method of lubricating an internal combustion engine,
comprising supplying to said engine an oil of lubricating
viscosity, and a condensation product of a material represented by
formula I and an alcohol or amine having 1 to about 150 carbon
atoms and combinations thereof; ##STR00007## wherein in the product
each R is independently H or a hydrocarbyl group, or wherein the R
groups together form a ring; or wherein if R is H, then the
resulting hydroxyl group is further functionalized by acylation or
reaction with a boron compound; wherein said lubricant composition
has a sulfated ash value of up to about 1.0, a phosphorus content
of up to about 0.08 percent by weight and a sulfur content of up to
about 0.4 percent by weight.
17. The method of making a lubricant composition comprising: (a)
blending an oil of lubricating viscosity and a condensation product
of a material represented by formula I and an alcohol or amine
having 1 to about 150 carbon atoms and combinations thereof;
##STR00008## wherein in the product each R is independently H or a
hydrocarbyl group, or wherein the R groups together form a ring; or
wherein if R is H, then the resulting hydroxyl group is further
functionalized by acylation or reaction with a boron compound;
resulting in a lubricant composition wherein said lubricant
composition has a sulfated ash value of up to about 1.0, a
phosphorus content of up to about 0.08 percent by weight and a
sulfur content of up to about 0.4 percent by weight.
18. The composition of claim 1 wherein the alcohol or amine has
about 8 to about 30 carbon atoms.
19. The composition of claim 1 wherein the condensation product (b)
is the product of condensation with an alcohol.
20. The composition of claim 19 wherein the alcohol is a branched
alcohol of 6 to about 18 carbon atoms.
21. The composition of claim 19 wherein the alcohol is a linear
alcohol of 6 to about 18 carbon atoms.
22. The composition of claim 20 wherein the condensation product
(b) is a branched C.sub.12-16-alkyl tartrate ester.
23. The composition of claim 21 wherein the condensation product
(b) is a linear C.sub.12-16-alkyl tartrate ester.
24. The composition of claim 18 further comprising an additional
friction modifier.
25. The composition of claim 18 wherein the additional friction
modifier is an ester of a polyol.
26. The composition of claim 24 wherein the ester of a polyol
comprises glycerol monooleate.
27. The method of claim 16 wherein the condensation product (b) is
the product of condensation with an alcohol.
28. The method of claim 27 wherein the alcohol comprises a branched
alcohol of 6 to about 18 carbon atoms.
29. The method of claim 27 wherein the alcohol comprises a linear
alcohol of 6 to about 18 carbon atoms.
30. The method of claim 27 wherein said lubricating composition
further comprises glycerol monooleate.
Description
CROSS-REFERENCE TO PRIOR APPLICATION
[0001] This is a continuation-in-part of U.S. Ser. No. 10/963,082,
filed Oct. 12, 2004.
BACKGROUND OF THE INVENTION
[0002] The present invention relates to a low sulfur, low ash, low
phosphorous lubricant composition and method for lubricating an
internal combustion engine, providing improved fuel economy and
retention of fuel economy and wear and friction reduction.
[0003] Fuel economy is of great importance, and lubricants which
can foster improved fuel economy by, for instance, reducing
friction within an engine, are of significant value. The present
invention provides a low sulfur, low ash, low phosphorous lubricant
composition, including an additive package, which leads to improved
fuel economy in an internal combustion engine. This improvement is
effected by providing an additive package in which the friction
modifier component is exclusively or predominantly a tartrimide or
a tartramide or combinations thereof.
[0004] U.S. Pat. No. 4,237,022, Barrer, Dec. 2, 1980, discloses
tartrimides useful as additives in lubricants and fuels for
effective reduction in squeal and friction as well as improvement
in fuel economy.
[0005] U.S. Pat. No. 4,952,328, Davis et al., Aug. 28, 1990,
discloses lubricating oil compositions for internal combustion
engines, comprising (A) oil of lubricating viscosity, (B) a
carboxylic derivative produced by reacting a succinic acylating
agent with certain amines, and (C) a basic alkali metal salt of
sulfonic or carboxylic acid. An illustrative lubricant composition
(Lubricant III) includes base oil including viscosity index
modifier; a basic magnesium alkylated benzene sulfonate; an
overbased sodium alkylbenzene sulfonate; a basic calcium alkylated
benzene sulfonate; succinimide dispersant; and zinc salts of a
phosphorodithioic acids.
[0006] U.S. Pat. No. 4,326,972, Chamberlin, Apr. 27, 1982,
discloses lubricant compositions for improving fuel economy of
internal combustion engines. The composition includes a specific
sulfurized composition (based on an ester of a carboxylic acid) and
a basic alkali metal sulfonate. Additional ingredients may include
at least one oil-dispersible detergent or dispersant, a viscosity
improving agent, and a specific salt of a phosphorus acid.
SUMMARY OF THE INVENTION
[0007] The present invention provides a low-sulfur, low-phosphorus,
low-ash lubricant composition suitable for lubricating an internal
combustion engine, comprising the following components:
[0008] (a) an oil of lubricating viscosity, and
[0009] (b) a condensation product of a material represented by
formula I and an alcohol or amine having 1 to about 150 carbon
atoms and combinations thereof;
##STR00001##
[0010] wherein each R is independently H or a hydrocarbyl group, or
wherein the R groups together form a ring; and wherein if R is H,
the condensation product is optionally further functionalized by
acylation or reaction with a boron compound;
[0011] wherein said lubricant composition has a sulfated ash value
of up to about 1.0, a phosphorus content of up to about 0.08
percent by weight and a sulfur content of up to about 0.4 percent
by weight.
[0012] It further provides a method of lubricating an internal
combustion engine, comprising supplying the lubricant composition
to the engine.
DETAILED DESCRIPTION OF THE INVENTION
[0013] Various preferred features and embodiments will be described
below by way of non-limiting illustration.
[0014] The present invention provides a composition as described
above. Often the composition has total sulfur content in one aspect
below 0.4 percent by weight, in another aspect below 0.3 percent by
weight, in yet another aspect 0.2 percent by weight or less and in
yet another aspect 0.1 percent by weight or less. Often the major
source of sulfur in the composition of the invention is derived
from conventional diluent oil. A typical range for the total sulfur
content is 0.1 to 0.01 percent by weight.
[0015] Often the composition has a total phosphorus content of less
than or equal to 800 ppm, in another aspect equal to or less than
500 ppm, in yet another aspect equal to or less than 300 ppm, in
yet another aspect equal to or less than 200 ppm and in yet another
aspect equal to or less than 100 ppm of the composition. A typical
range for the total phosphorus content is 500 to 100 ppm.
[0016] Often the composition has a total sulfated ash content as
determined by ASTM D-874 of below 1.0 percent by weight, in one
aspect equal to or less than 0.7 percent by weight, in yet another
aspect equal to or less than 0.4 percent by weight, in yet another
aspect equal to or less than 0.3 percent by weight and in yet
another aspect equal to or less than 0.05 percent by weight of the
composition. A typical range for the total sulfate ash content is
0.7 to 0.05 percent by weight.
Oil of Lubricating Viscosity
[0017] The low-sulfur, low-phosphorus, low-ash lubricating oil
composition is comprised of one or more base oils which are
generally present in a major amount (i.e. an amount greater than
about 50 percent by weight). Generally, the base oil is present in
an amount greater than about 60 percent, or greater than about 70
percent, or greater than about 80 percent by weight of the
lubricating oil composition. The base oil sulfur content is
typically less than 0.2 percent by weight.
[0018] The low-sulfur, low-phosphorus, low-ash lubricating oil
composition may have a viscosity of up to about 16.3 mm.sup.2/s at
100.degree. C., and in one embodiment 5 to 16.3 mm.sup.2/s (cSt) at
100.degree. C., and in one embodiment 6 to 13 mm.sup.2/s (cSt) at
100.degree. C. In one embodiment, the lubricating oil composition
has an SAE Viscosity Grade of 0W, 0W-20, 0W-30, 0W-40, 0W-50,
0W-60, 5W, 5W-20, 5W-30, 5W-40, 5W-50, 5W-60, 10W, 10W-20, 10W-30,
10W-40 or 10W-50.
[0019] The low-sulfur, low-phosphorus, low-ash lubricating oil
composition may have a high-temperature/high-shear viscosity at
150.degree. C. as measured by the procedure in ASTM D4683 of up to
4 mm.sup.2/s (cSt), and in one embodiment up to 3.7 mm.sup.2/s
(cSt), and in one embodiment 2 to 4 mm.sup.2/s (cSt), and in one
embodiment 2.2 to 3.7 mm.sup.2/s (cSt), and in one embodiment 2.7
to 3.5 mm.sup.2/s (cSt).
[0020] The base oil used in the low-sulfur low-phosphorus, low-ash
lubricant composition may be a natural oil, synthetic oil or
mixture thereof, provided the sulfur content of such oil does not
exceed the above-indicated sulfur concentration limit required for
the inventive low-sulfur, low-phosphorus, low-ash lubricating oil
composition. The natural oils that are useful include animal oils
and vegetable oils (e.g., castor oil, lard oil) as well as mineral
lubricating oils such as liquid petroleum oils and solvent treated
or acid-treated mineral lubricating oils of the paraffinic,
naphthenic or mixed paraffinic-naphthenic types. Oils derived from
coal or shale are also useful. Synthetic lubricating oils include
hydrocarbon oils such as polymerized and interpolymerized olefins
(e.g., polybutylenes, polypropylenes, propylene isobutylene
copolymers, etc.); poly(1-hexenes), poly-(1-octenes),
poly(1-decenes), etc. and mixtures thereof; alkylbenzenes (e.g.,
dodecylbenzenes, tetradecylbenzenes, dinonylbenzenes,
di-(2-ethylhexyl)benzenes, etc.); polyphenyls (e.g., biphenyls,
terphenyls, alkylated polyphenyls, etc.); alkylated diphenyl ethers
and the derivatives, analogs and homologs thereof and the like.
[0021] Alkylene oxide polymers and interpolymers and derivatives
thereof where the terminal hydroxyl groups have been modified by
esterification, etherification, etc., constitute another class of
known synthetic lubricating oils that can be used. These are
exemplified by the oils prepared through polymerization of ethylene
oxide or propylene oxide, the alkyl and aryl ethers of these
polyoxyalkylene polymers (e.g., methyl-polyisopropylene glycol
ether having an average molecular weight of about 1000, diphenyl
ether of polyethylene glycol having a molecular weight of about
500-1000, diethyl ether of polypropylene glycol having a molecular
weight of about 1000-1500, etc.) or mono- and polycarboxylic esters
thereof, for example, the acetic acid esters, mixed C3-8 fatty acid
esters, or the carboxylic acid diester of tetraethylene glycol.
[0022] Another suitable class of synthetic lubricating oils that
can be used comprises the esters of dicarboxylic acids (e.g.,
phthalic acid, succinic acid, alkyl succinic acids, alkenyl
succinic acids, maleic acid, azelaic acid, suberic acid, sebacic
acid, fumaric acid, adipic acid, linoleic acid dimer, malonic acid,
alkyl malonic acids, alkenyl malonic acids, etc.) with a variety of
alcohols (e.g., butyl alcohol, hexyl alcohol, dodecyl alcohol,
2-ethylhexyl alcohol, ethylene glycol, diethylene glycol monoether,
propylene glycol, etc.) Specific examples of these esters include
dibutyl adipate, di(2-ethylhexyl) sebacate, di-n-hexyl fumarate,
dioctyl sebacate, diisooctyl azelate, diisodecyl azelate, dioctyl
phthalate, didecyl phthalate, dieicosyl sebacate, the 2-ethylhexyl
diester of linoleic acid dimer, the 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.
[0023] 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, tripentaerythritol, etc.
[0024] The oil can be a poly-alpha-olefin (PAO). Typically, the
PAOs are derived from monomers having from 4 to 30, or from 4 to
20, or from 6 to 16 carbon atoms. Examples of useful PAOs include
those derived from octene, decene, mixtures thereof, and the like.
These PAOs may have a viscosity from 2 to 15, or from 3 to 12, or
from 4 to 8 mm.sup.2/s (cSt), at 100.degree. C. Examples of useful
PAOs include 4 mm.sup.2/s (cSt) at 100.degree. C.
poly-alpha-olefins, 6 mm.sup.2/s (cSt) at 100.degree. C.
poly-alpha-olefins, and mixtures thereof. Mixtures of mineral oil
with one or more of the foregoing PAOs may be used.
[0025] Unrefined, refined and rerefined oils, either natural or
synthetic (as well as mixtures of two or more of any of these) of
the type disclosed hereinabove can be used in the lubricants of the
present invention. Unrefined oils are those obtained directly from
a natural or synthetic source without further purification
treatment. For example, a shale oil obtained directly from
retorting operations, a petroleum oil obtained directly from
primary distillation or ester oil obtained directly from an
esterification process and used without further treatment would be
an unrefined oil. Refined oils are similar to the unrefined oils
except they have been further treated in one or more purification
steps to improve one or more properties. Many such purification
techniques are known to those skilled in the art such as solvent
extraction, secondary distillation, acid or base extraction,
filtration, percolation, etc. Rerefined oils are obtained by
processes similar to those used to obtain refined oils applied to
refined oils which have been already used in service. Such
rerefined oils are also known as reclaimed or reprocessed oils and
often are additionally processed by techniques directed to removal
of spent additives and oil breakdown products.
[0026] Additionally, oils prepared by a Fischer-Tropsch gas to
liquid synthetic procedure are known and can be used.
Friction Modifier
[0027] The tartrates, tartrimides, tartramides or combinations
thereof of the present invention can be prepared by the reaction of
tartaric acid and one or more alcohols or amines. The amines, for
example, may have the formula RR'NH wherein R and R' each
independently represent H, a hydrocarbon-based radical of 1 or 8 to
30 or to 150 carbon atoms, that is, 1-150 or 8-30 or 1-30 or 8-150
atoms. Other amines may be be employed within a range having a
lower carbon number of 2, 3, 4, 6, 10, or 12 carbon atoms and an
upper carbon number of 120, 80, 48, 24, 20, 18, or 16 carbon atoms.
In one embodiment, each of the groups R and R' has 8 to 30 carbon
atoms. In one embodiment, the sum of carbon atoms in R and R' is at
least 8. The substituent R and R' may also be --R''OR''' in which
R'' is a divalent alkylene radical of 2 to 6 carbon atoms and R'''
is a hydrocarbyl radical of 5 to 150 or to 148 or to 146 or to 144
carbon atoms.
[0028] Amines suitable for the present tartrimide, tartramides or
combinations thereof include those represented by the formula or
RR'NH wherein R and R' represent H or a hydrocarbyl radical of 1 to
150 carbon atoms provided that, in certain embodiments, the sum of
the carbon atoms in R and R' is at least 8. In one embodiment R or
R' contain 8 to 26 carbons and in another embodiment from 12 to 18
carbon atoms.
[0029] The tartrimides, tartramides or combinations thereof of the
present invention may be prepared conveniently by reacting tartaric
acid or a reactive equivalent of the tartaric acid (such as an
ester, acid halide, or anhydride) with one or more of the
corresponding amines by a well-known condensation process.
[0030] The alcohols useful for preparing the tartrates will
similarly contain 1 or 8 to 30 or to 150 carbon atoms, that is,
1-150 or 8-30 or 1-30 or 8-150 atoms. Other alcohols may be
employed within a range having a lower carbon number of 2, 3, 4, 6,
10, or 12 carbon atoms and an upper carbon number of 120, 80, 48,
24, 20, 18, or 16 carbon atoms. In certain embodiments the number
of carbon atoms in the alcohol-derived group may be 8-24 or 10-18
or 12 to 16, or 13. The alcohols employed may be linear or
branched, and, if branched, the branching may occur at any point in
the chain and the branching may be of any length.
[0031] It is believed that using alcohols of at least 6 carbon
atoms will lead to products having reduced volatility compared with
those products prepared from shorter chain alcohols. It is also
believed that using alcohols having at least one branch will
promote solubility of the product in oil. Accordingly, certain
embodiments of the invention employ the product prepared from
branched alcohols of at least 6 carbon atoms, for instance,
branched C.sub.6-18 or C.sub.8-18 alcohols or branched C.sub.12-16
alcohols, either as single materials or as mixtures. Such branched
alcohols may provide maximum solubility and compatibility in an
oil. Specific examples include 2-ethylhexanol and isotrideyl
alcohol, the latter of which may represent a commercial grade
mixture of various isomers. Also, certain embodiments of the
invention employ the product prepared from linear alcohols of at
least 6 carbon atoms, for instance, linear C.sub.6-18 or C.sub.8-18
alcohols or linear C.sub.12-16 alcohols, either as single materials
or as mixtures. Such linear alcohols my provide optimal friction
performance to an oil.
[0032] The tartrates of the present invention may be prepared
conveniently by reacting tartaric acid or a reactive equivalent of
the tartaric acid (such as an ester, acid halide, or anhydride)
with one or more of the corresponding alcohols by a well-known
condensation process.
[0033] Likewise, the alkyl groups of the amines may similarly be
linear or branched.
[0034] The tartaric acid used for preparing the tartrates,
tartrimides, or tartramides of the invention can be the
commercially available type (obtained from Sargent Welch), and it
is likely to exist in one or more isomeric forms such as dtartaric
acid, l-tartaric acid or mesotartaric acid, often depending on the
source (natural) or method of synthesis (e.g. from maleic acid).
These derivatives can also be prepared from functional equivalents
to the diacid readily apparent to those skilled skilled in the art,
such as esters, acid chlorides, anhydrides, etc.
[0035] The tartrates, tartrimides, tartramides or combinations
thereof of the present invention can be solids, semi-solids, or
oils depending on the particular alcohol or amine used in preparing
the tartrate, tartrimide, or tartramides. For use as additives in
oleaginous compositions including lubricating and fuel compositions
the tartrates, tartrimides, or tartramides are advantageously
soluble and/or stably dispersible in such oleaginous compositions.
Thus, for example, compositions intended for use in oils are
typically oil-soluble and/or stably dispersible in an oil in which
they are to be used. The term "oil-soluble" as used in this
specification and appended claims does not necessarily mean that
all the compositions in question are miscible or soluble in all
proportions in all oils. Rather, it is intended to mean that the
composition is soluble in an oil (mineral, synthetic, etc.) in
which it is intended to function to an extent which permits the
solution to exhibit one or more of the desired properties.
Similarly, it is not necessary that such "solutions" be true
solutions in the strict physical or chemical sense. They may
instead be micro-emulsions or colloidal dispersions which, for the
purpose of this invention, exhibit properties sufficiently close to
those of true solutions to be, for practical purposes,
interchangeable with them within the context of this invention.
[0036] As previously indicated, the tartrates, tartrimides,
tartramides or combinations thereof compositions of this invention
are useful as additives for lubricants, in which they may function
as rust and corrosion inhibitors, friction modifiers, antiwear
agents and demulsifiers. They can be employed in a variety of
lubricants based on diverse oils of lubricating viscosity,
including natural and synthetic lubricating oils and mixtures
thereof. These lubricants include crankcase lubricating oils for
spark-ignited and compression-ignited internal combustion engines,
including automobile and truck engines, two-cycle engines, aviation
piston engines, marine and railroad diesel engines, and the like.
They can also be used in gas engines, stationary power engines and
turbines, and the like. Automatic transmission fluids, transaxle
lubricants, gear lubricants, metalworking lubricants, hydraulic
fluids and other lubricating oil and grease compositions can also
benefit from the incorporation therein of the compositions of the
present invention.
[0037] Other friction modifiers maybe present in the lubricants of
the present invention and can include esters of polyols such as
glycerol monooleates; oleyl amides; diethanol fatty amines and
mixtures thereof. A useful list of friction modifiers is included
in U.S. Pat. No. 4,792,410.
[0038] Esters of polyols include fatty acid esters of glycerol.
These can be prepared by a variety of methods well known in the
art. Many of these esters, such as glycerol monooleate and glycerol
monotallowate, are manufactured on a commercial scale. The esters
useful for this invention are oil-soluble and are preferably
prepared from C.sub.8 to C.sub.22 fatty acids or mixtures thereof
such as are found in natural products. The fatty acid may be
saturated or unsaturated. Certain compounds found in acids from
natural sources may include licanic acid which contains one keto
group. Useful C.sub.8 to C.sub.22 fatty acids are those of the
formula R--COOH wherein R is alkyl or alkenyl.
[0039] The fatty acid monoester of glycerol is useful. Mixtures of
mono and diesters may be used. Mixtures of mono- and diester can
contain at least about 40% of the monoester. Mixtures of mono- and
diesters of glycerol containing from about 40% to about 60% by
weight of the monoester can be used. For example, commercial
glycerol monooleate containing a mixture of from 45% to 55% by
weight monoester and from 55% to 45% diester can be used.
[0040] Useful fatty acids are oleic, stearic, isostearic, palmitic,
myristic, palmitoleic, linoleic, lauric, linolenic, and
eleostearic, and the acids from the natural products tallow, palm
oil, olive oil, peanut oil.
[0041] Although tartrates and esters of polyols such as glycerol
monooleate may appear to have superficially similar molecular
structures, it is observed that certain combinations of these
materials may actually provide better performance, e.g., in wear
prevention, than either material used alone.
[0042] Fatty acid amides have been discussed in detail in U.S. Pat.
No. 4,280,916. Suitable amides are C.sub.8-C.sub.24 aliphatic
monocarboxylic amides and are well known. Reacting the fatty acid
base compound with ammonia produces the fatty amide. The fatty
acids and amides derived therefrom may be either saturated or
unsaturated. Important fatty acids include lauric C.sub.12,
palmitic C.sub.16 and steric C.sub.18. Other important unsaturated
fatty acids include oleic, linoleic and linolenic acids, all of
which are C.sub.18. In one embodiment, the fatty amides of the
instant invention are those derived from the C.sub.18 unsaturated
fatty acids.
[0043] The fatty amines and the diethoxylated long chain amines
such as N,N-bis-(2-hydroxyethyl)-tallowamine themselves are
generally useful as components of this invention. Both types of
amines are commercially available. Fatty amines and ethoxylated
fatty amines are described in greater detail in U.S. Pat. No.
4,741,848
Miscellaneous
[0044] Antioxidants (that is, oxidation inhibitors), including
hindered phenolic antioxidants such as 2,6,-di-t-butylphenol, and
hindered phenolic esters such as the type represented by the
following formula:
##STR00002##
and in a specific embodiment,
##STR00003##
wherein R.sup.3 is a straight chain or branched chain alkyl group
containing 2 to 10 carbon atoms, in one embodiment 2 to 4, and in
another embodiment 4 carbon atoms. In one embodiment, R.sup.3 is an
n-butyl group. In another embodiment R.sup.3 can be 8 carbons, as
found in Irganox L-135.TM. from Ciba. The preparation of these
antioxidants can be found in U.S. Pat. No. 6,559,105.
[0045] Further antioxidants can include secondary aromatic amine
antioxidants such as dialkyl (e.g., dinonyl) diphenylamine,
sulfurized phenolic antioxidants, oil-soluble copper compounds,
phosphorus-containing antioxidants, molybdenum compounds such as
the Mo dithiocarbamates, organic sulfides, disulfides, and
polysulfides (such as sulfurized Diels Alder adduct of butadiene
and butyl acrylate). An extensive list of antioxidants is found in
U.S. Pat. No. 6,251,840.
[0046] The EP/antiwear agent used in connection with the present
invention is typically in the form of a zinc
dialkyldithiophosphate. Although there are an extremely large
number of different types of antiwear agents which might be
utilized in connection with such functional fluids, the present
inventors have found that zinc dialkyldithiophosphate type antiwear
agents work particularly well in connection with the other
components to obtain the desired characteristics. In one
embodiment, at least 50% of the alkyl groups (derived from the
alcohol) in the dialkyldithiophosphate are secondary groups, that
is, from secondary alcohols. In another embodiment, at least 50% of
the alkyl groups are derived from isopropyl alcohol.
[0047] Ashless detergents and dispersants depending on their
constitution may upon combustion yield a non-volatile material such
as boric oxide or phosphorus pentoxide. However, ashless detergents
and dispersants do not ordinarily contain metal and therefore do
not yield a metal-containing ash on combustion. Many types of
ashless dispersants are known in the art. Such materials are
commonly referred to as "ashless" even though they may associate
with a metal ion from another source in situ.
[0048] (1) "Carboxylic dispersants" are reaction products of
carboxylic acylating agents (acids, anhydrides, esters, etc.)
containing at least 34 and preferably at least 54 carbon atoms
which are reacted with nitrogen containing compounds (such as
amines), organic hydroxy compounds (such as aliphatic compounds
including monohydric and polyhydric alcohols, or aromatic compounds
including phenols and naphthols), and/or basic inorganic materials.
These reaction products include imide, amide, and ester reaction
products of carboxylic ester dispersants.
[0049] The carboxylic acylating agents include fatty acids,
isoaliphatic acids (e.g. 8-methyl-octadecanoic acid), dimer acids,
addition dicarboxylic acids 4+2 and 2+2 addition products of an
unsaturated fatty acid with an unsaturated carboxylic reagent),
trimer acids, addition tricarboxylic acids (Empol.RTM. 1040,
Hystrene.RTM. 5460 and Unidyme.RTM. 60), and hydrocarbyl
substituted carboxylic acylating agents (from olefins and/or
polyalkenes). In one embodiment, the carboxylic acylating agent is
a fatty acid. Fatty acids generally contain from 8 up to 30, or
from 12 up to 24 carbon atoms. Carboxylic acylating agents are
taught in U.S. Pat. Nos. 2,444,328, 3,219,666, 4,234,435 and
6,077,909.
[0050] The amine may be a mono- or polyamine. The monoamines
generally have at least one hydrocarbyl group containing from 1 to
24 carbon atoms, or from 1 to 12 carbon atoms. Examples of
monoamines include fatty (C.sub.8-30) amines (Armeens.TM.), primary
ether amines (SURFAM.RTM. amines), tertiaryaliphatic primary amines
(Primenes.TM.), hydroxyamines (primary, secondary or tertiary
alkanol amines), ether N-(hydroxyhydrocarbyl) amines, and
hydroxyhydrocarbyl amines (Ethomeens.TM. and Propomeens.TM.). The
polyamines include alkoxylated diamines (Ethoduomeens.TM.), fatty
diamines (Duomeens.TM.), alkylenepolyamines (ethylenepolyamines),
hydroxy-containing polyamines, polyoxyalkylene polyamines
(Jeffamines.TM.), condensed polyamines (a condensation reaction
between at least one hydroxy compound with at least one polyamine
reactant containing at least one primary or secondary amino group),
and heterocyclic polyamines. Useful amines include those disclosed
in U.S. Pat. No. 4,234,435 (Meinhart) and U.S. Pat. No. 5,230,714
(Steckel).
[0051] The polyamines from which the dispersant is derived include
principally alkylene amines conforming, for the most part, to the
formula
##STR00004##
wherein t is an integer typically less than 10, A is hydrogen or a
hydrocarbyl group typically having up to 30 carbon atoms, and the
alkylene group is typically an alkylene group having less than 8
carbon atoms. The alkylene amines include principally methylene
amines, ethylene amines, hexylene amines, heptylene amines,
octylene amines, other polymethylene amines. They are exemplified
specifically by: ethylene diamine, diethylene triamine, triethylene
tetramine, propylene diamine, decamethylene diamine, octamethylene
diamine, di(heptamethylene) triamine, tripropylene tetramine,
tetraethylene pentamine, trimethylene diamine, pentaethylene
hexamine, di(-trimethylene) triamine. Higher homologues such as are
obtained by condensing two or more of the above-illustrated
alkylene amines likewise are useful. Tetraethylene pentamines is
particularly useful.
[0052] The ethylene amines, also referred to as polyethylene
polyamines, are especially useful. They are described in some
detail under the heading "Ethylene Amines" in Encyclopedia of
Chemical Technology, Kirk and Othmer, Vol. 5, pp. 898-905,
Interscience Publishers, New York (1950).
[0053] Hydroxyalkyl-substituted alkylene amines, i.e., alkylene
amines having one or more hydroxyalkyl substituents on the nitrogen
atoms, likewise are useful. Examples of such amines include
N-(2-hydroxyethyl)ethylene diamine,
N,N'-bis(2-hydroxyethyl)-ethylene diamine,
1-(2-hydroxyethyl)piperazine, monohydroxypropyl)-piperazine,
di-hydroxypropy-substituted tetraethylene pentamine,
N-(3-hydroxypropyl)-tetra-methylene diamine, and
2-heptadecyl-1-(2-hydroxyethyl)-imidazoline.
[0054] Higher homologues, such as are obtained by condensation of
the above-illustrated alkylene amines or hydroxy alkyl-substituted
alkylene amines through amino radicals or through hydroxy radicals,
are likewise useful. Condensed polyamines are formed by a
condensation reaction between at least one hydroxy compound with at
least one polyamine reactant containing at least one primary or
secondary amino group and are described in U.S. Pat. Nos. 5,230,714
and 5,296,154 (Steckel).
[0055] Examples of these "carboxylic dispersants" are described in
British Patent 1,306,529 and in many U.S. patents including the
following: U.S. Pat. Nos. 3,219,666, 3,316,177, 3,340,281,
3,351,552, 3,381,022, 3,433,744, 3,444,170, 3,467,668, 3,501,405,
3,542,680, 3,576,743, 3,632,511, 4,234,435, 6,077,909 and
6,165,235.
[0056] (2) Succinimide dispersants are a species of carboxylic
dispersants. They are the reaction product of a hydrocarbyl
substituted succinic acylating agent with an organic hydroxy
compound or, an amine containing at least one hydrogen attached to
a nitrogen atom, or a mixture of said hydroxy compound and amine.
The term "succinic acylating agent" refers to a
hydrocarbon-substituted succinic acid or succinic acid-producing
compound (which term also encompasses the acid itself). Such
materials typically include hydrocarbyl-substituted succinic acids,
anhydrides, esters (including half esters) and halides.
[0057] Succinic based dispersants have a wide variety of chemical
structures including typically structures such as
##STR00005##
[0058] In the above structure, each R.sup.1 is independently a
hydrocarbyl group, such as a polyolefin-derived group having an
M.sub.n of 500 or 700 to 10,000. Typically the hydrocarbyl group is
an alkyl group, frequently a polyisobutyl group with a molecular
weight of 500 or 700 to 5000, or alternatively 1500 or 2000 to
5000. Alternatively expressed, the R.sup.1 groups can contain 40 to
500 carbon atoms, for instance at least 50, e.g., 50 to 300 carbon
atoms, such as aliphatic carbon atoms. The R.sup.2 are alkylene
groups, commonly ethylene (C.sub.2H.sub.4) groups. Such molecules
are commonly derived from reaction of an alkenyl acylating agent
with a polyamine, and a wide variety of linkages between the two
moieties is possible beside the simple imide structure shown above,
including a variety of amides and quaternary ammonium salts.
Succinimide dispersants are more fully described in U.S. Pat. Nos.
4,234,435, 3,172,892 and 6,165,235.
[0059] The polyalkenes from which the substituent groups are
derived are typically homopolymers and interpolymers of
polymerizable olefin monomers of 2 to 16 carbon atoms; usually 2 to
6 carbon atoms. The amines which are reacted with the succinic
acylating agents to form the carboxylic dispersant composition can
be monoamines or polyamines as described above.
[0060] The succinimide dispersant is referred to as such since it
normally contains nitrogen largely in the form of imide
functionality, although it may be in the form of amine salts,
amides, imidazolines as well as mixtures thereof. To prepare the
succinimide dispersant, one or more of the succinic acid-producing
compounds and one or more of the amines are heated, typically with
removal of water, optionally in the presence of a normally liquid,
substantially inert organic liquid solvent/diluent at an elevated
temperature, generally in the range of 80.degree. C. up to the
decomposition point of the mixture or the product; typically
100.degree. C. to 300.degree. C.
[0061] Additional details and examples of the procedures for
preparing the succinimide dispersants of the present invention are
included in, for example, U.S. Pat. Nos. 3,172,892, 3,219,666,
3,272,746, 4,234,435, 6,440,905 and 6,165,235.
[0062] (3) "Amine dispersants" are reaction products of relatively
high molecular weight aliphatic halides and amines, preferably
polyalkylene polyamines. Examples thereof are described, for
example, in the following U.S. Pat. Nos. 3,275,554, 3,438,757,
3,454,555, and 3,565,804.
[0063] (4) "Mannich dispersants" are the reaction products of alkyl
phenols in which the alkyl group contains at least 30 carbon atoms
with aldehydes (especially formaldehyde) and amines (especially
polyalkylene polyamines). The materials described in the following
U.S. patents are illustrative: U.S. Pat. Nos. 3,036,003, 3,236,770,
3,414,347, 3,448,047, 3,461,172, 3,539,633, 3,586,629, 3,591,598,
3,634,515, 3,725,480, 3,726,882, and 3,980,569.
[0064] (5) Post-treated dispersants are obtained by reacting
carboxylic, amine or Mannich dispersants with reagents such as
dimercaptothiadiazoles, urea, thiourea, carbon disulfide,
aldehydes, ketones, carboxylic acids, hydrocarbon-substituted
succinic anhydrides, nitriles epoxides, boron compounds, phosphorus
compounds or the like. Exemplary materials of this kind are
described in the following U.S. Pat. Nos. 3,200,107, 3,282,955,
3,367,943, 3,513,093, 3,639,242, 3,649,659, 3,442,808, 3,455,832,
3,579,450, 3,600,372, 3,702,757, and 3,708,422.
[0065] (6) Polymeric dispersants are interpolymers of
oil-solubilizing monomers such as decyl methacrylate, vinyl decyl
ether and high molecular weight olefins with monomers containing
polar substituents, e.g., aminoalkyl acrylates or acrylamides and
poly-(oxyethylene)-substituted acrylates. Examples of polymer
dispersants thereof are disclosed in the following U.S. Pat. Nos.
3,329,658, 3449,250, 3,519,656, 3,666,730, 3,687,849, and
3,702,300.
[0066] The composition can also contain one or more detergents,
which are normally salts, and specifically overbased salts.
Overbased salts, or overbased materials, are single phase,
homogeneous Newtonian systems characterized by a metal content in
excess of that which would be present according to the
stoichiometry of the metal and the particular acidic organic
compound reacted with the metal. The overbased materials are
prepared by reacting an acidic material (typically an inorganic
acid or lower carboxylic acid, preferably carbon dioxide) with a
mixture comprising an acidic organic compound, a reaction medium
comprising at least one inert, organic solvent (such as mineral
oil, naphtha, toluene, xylene) for said acidic organic material, a
stoichiometric excess of a metal base, and a promoter.
[0067] The acidic organic compounds useful in making the overbased
compositions of the present invention include carboxylic acids,
sulfonic acids, phosphorus-containing acids, phenols or mixtures
thereof. Preferably, the acidic organic compounds are carboxylic
acids or sulfonic acids with sulfonic or thiosulfonic groups (such
as hydrocarbyl-substituted benzenesulfonic acids), and
hydrocarbyl-substituted salicylic acids. Another type of compound
useful in making the overbased composition of the present invention
is salixarates. A description of the salixarates useful for of the
present invention can be found in publication WO 04/04850.
[0068] The metal compounds useful in making the overbased salts are
generally any Group 1 or Group 2 metal compounds (CAS version of
the Periodic Table of the Elements). The Group 1 metals of the
metal compound include Group 1a alkali metals (e.g., sodium,
potassium, lithium) as well as Group 1b metals such as copper. The
Group 1 metals are preferably sodium, potassium, lithium and
copper, preferably sodium or potassium, and more preferably sodium.
The Group 2 metals of the metal base include the Group 2a alkaline
earth metals (e.g., magnesium, calcium, strontium, barium) as well
as the Group 2b metals such as zinc or cadmium. Preferably the
Group 2 metals are magnesium, calcium, barium, or zinc, preferably
magnesium or calcium, more preferably calcium.
[0069] Examples of the overbased detergent of the present invention
include, but are not limited to calcium sulfonates, calcium
phenates, calcium salicylates, calcium salixarates and mixtures
thereof.
[0070] The amount of the overbased material, that is, the
detergent, if present, is in one embodiment 0.05 to 3 percent by
weight of the composition, or 0.1 to 3 percent, or 0.1 to 1.5
percent, or 0.15 to 1.5 percent by weight.
[0071] Anti-foam agents used to reduce or prevent the formation of
stable foam include silicones or organic polymers. Examples of
these and additional anti-foam compositions are described in "Foam
Control Agents", by Henry T. Kerner (Noyes Data Corporation, 1976),
pages 125-162.
[0072] The compositions of the present invention are employed in
practice as lubricants by supplying the lubricant to an internal
combustion engine (such as a stationary gas-powered internal
combustion engine) in such a way that during the course of
operation of the engine the lubricant is delivered to the critical
parts of the engine, thereby lubricating the engine.
[0073] As used herein, the term "hydrocarbyl substituent" or
"hydrocarbyl group" is used in its ordinary sense, which is
well-known to those skilled in the art. Specifically, it refers to
a group having a carbon atom directly attached to the remainder of
the molecule and having predominantly hydrocarbon character.
Examples of hydrocarbyl groups include: hydrocarbon substituents,
that is, aliphatic (e.g., alkyl or alkenyl), alicyclic (e.g.,
cycloalkyl, cycloalkenyl) substituents, and aromatic-, aliphatic-,
and alicyclic-substituted aromatic substituents, as well as cyclic
substituents wherein the ring is completed through another portion
of the molecule (e.g., two substituents together form a ring);
substituted hydrocarbon substituents, that is, substituents
containing non-hydrocarbon groups which, in the context of this
invention, do not alter the predominantly hydrocarbon nature of the
substituent (e.g., halo (especially chloro and fluoro), hydroxy,
alkoxy, mercapto, alkylmercapto, nitro, nitroso, and sulfoxy);
hetero substituents, that is, substituents which, while having a
predominantly hydrocarbon character, in the context of this
invention, contain other than carbon in a ring or chain otherwise
composed of carbon atoms. Heteroatoms include sulfur, oxygen,
nitrogen, and encompass substituents as pyridyl, furyl, thienyl and
imidazolyl. In general, no more than two, preferably no more than
one, non-hydrocarbon substituent will be present for every ten
carbon atoms in the hydrocarbyl group; typically, there will be no
non-hydrocarbon substituents in the hydrocarbyl group.
[0074] It is known that some of the materials described above may
interact in the final formulation, so that the components of the
final formulation may be different from those that are initially
added. For instance, metal ions (of, e.g., a detergent) can migrate
to other acidic or anionic sites of other molecules. The products
formed thereby, including the products formed upon employing the
composition of the present invention in its intended use, may not
be susceptible of easy description. Nevertheless, all such
modifications and reaction products are included within the scope
of the present invention; the present invention encompasses the
composition prepared by admixing the components described
above.
EXAMPLES
[0075] The invention will be further illustrated by the following
examples, which set forth particularly advantageous embodiments.
While the examples are provided to illustrate the present
invention, they are not intended to limit it.
[0076] The lubricants are evaluated in the Sequence VIB fuel
economy test as defined by the ILSAC GF-4 specification for fuel
economy and durability.
[0077] The following formulations are prepared in an oil of
lubricating viscosity, where the amounts of the additive components
are in percent by weight, including conventional diluent oil.
TABLE-US-00001 TABLE I Example C1 C2 Ex. 3 Succinimide dispersant
5.1 5 5 Zinc dialkyldithiophosphate 0.84 0.86 0.86 Antioxidants
2.44 2.2 2.2 Pour Point Depressant 0 0 0.3 Overbased calcium
sulfonate 1.53 1.53 1.53 detergent(s) Viscosity Index Improver 8.15
8.15 8 Alkyl Borate 0 0.05 0.05 Friction Modifier 0 0.1 0.1
Glycerol monooleate n.p 0.4 n.p. Oleylamine Tartrimide n.p. n.p.
0.5 Sequence VIB Engine Initial Fuel Economy 1.5 1.8 1.9 (passing
.gtoreq.1.5) Durability (passing .gtoreq.1.5) 1.2 1.4 1.9 * n.p. =
not present in the formulation
[0078] The results show that formulations using oleylamine
tartrimide in a low sulfur, ash and phosphorous crankcase lubricant
significantly improves fuel economy compared to formulations using
glycerol monooleate, a conventional friction modifier, as
demonstrated in the Sequence VIB engine test.
[0079] The lubricants are further evaluated in the 4 Ball Low
Phosphorous/Sulfur (4 Ball Low PS) test, High Frequency
Reciprocating Rig 1% cumene hydroperoxide (HFRR 1% CHP) test and
the Cameron-Plint High Temperature Reciprocating Wear test for wear
and friction reduction.
[0080] The 4 Ball Low PS procedure utilizes the same test
conditions as ASTM D4172 with the addition of cumene hydroperoxide
(CHP) as a lubricant prestress. The basic operation of the four
ball wear test can be described as three stationary 0.5 diameter
steel ball bearings locked in a triangle pattern. A fourth steel
ball bearing is loaded against and rotated against the three
stationary balls. The wear scar is measured on each of the three
stationary balls using a microscope and averaged to determine the
average wear scar diameter in millimeters.
[0081] The HFRR 1% CHP test is used to evaluated the friction and
wear performance of lubricants containing reduced levels of
phosphorous and sulfur. The wear scar diameter and percent film
thickness by using a reciprocating steel ball bearing which slides
against a flat steel plate is measured. This test is run using 1%
cumene hydroperoxide (CHP) in conjunction with the High Frequency
Reciprocating Wear Rig, which is a commercially available piece of
tribology test equipment.
[0082] The Cameron-Plint High Temperature Reciprocating Wear test
is used to evaluate the friction and wear performance of
lubricants. The wear scar diameter and percent film thickness are
obtained by using a reciprocating steel ball bearing which slides
against a flat steel plate is measure. This test is run using the
Cameron-Plint Reciprocating Wear Rig, which is a commercially
available piece of tribology test equipment.
[0083] The following formulations are prepared in an oil of
lubricating viscosity, where the amounts of the additive components
are in percent by weight, unless indicated otherwise: 0.15% pour
point depressant (including about 35% diluent oil), 8% viscosity
index improver (including about 91% diluent oil), 0.89% diluent
oil, 5.1% succinimide dispersant (including about 47% diluent oil),
0.48% zinc dialkyldithiophosphate (except for C3, which contains
0.98%) (each including about 9% diluent oil), 1.53% overbased
calcium sulfonate detergent (including about 42% diluent oil), 0.1%
glycerol monooleate (including about 0% diluent oil), antioxidants
(including about 5% diluent oil), 90-100 ppm of a commercial
defoamer, and the remainder base oil.
[0084] To the above formulation are added the components, as found
in the following table and run in the 4 Ball Low PS test, the High
Frequency Reciprocating Rig 1% Cumene Hydroperoxide test and the
Cameron-Plint High Temperature Reciprocating Wear test. The results
are found in the table below.
TABLE-US-00002 TABLE II C3 C4 Ex. 5 Ex. 6 Ex. 7 Ex. 8 Ex. 9 Ex. 10
0.1% P 0.05% P 0.05% P 0.05% P 0.05% P 0.05% P 0.05% P 0.05% P
Additional Component: [1,3]Dioxolane C12-14 0.5 Alkyl Tartrate
Ester Oleyl Tartrimide 0.5 Oleyl Tartrimide 1 Branched C13 Alkyl 1
Tartrate Ester TriDecylPropoxy 1 Amine Tartrimide Borated TriDecyl-
1 PropoxyAmine Tartrimide Test: 1. 4 Ball Low PS Test Average Scar
0.59 0.61, 0.77 0.51 0.7 n.r. n.r. 0.45 0.41 Diameter (mm) 2. HFRR
1% CHP Test Wear Scar Diameter 161, 185 285, 295, 435 236 251 260
286 297 183 (.mu.m) Film Thickness (%) 94, 83 1, 1, 23 86 66 58 56
97 50 3. Cameron-Plint High Temperature Reciprocating Wear Test
Wear Scar Diameter 339 661 n.r. n.r. 375 352 n.r. n.r. (.mu.m) Film
Thickness (%) 100 62 n.r. n.r. 100 99 n.r. n.r. Note: n.r. = not
reported
[0085] The results show that formulations using tartaric acid
derived compounds of the present invention in a low sulfur, ash and
phosphorous lubricant (Ex. 5-10) reduce wear compared to low SAPS
formulation with 0.05 percent by weight of phosphorus delivered to
the composition (C4), which do not contain tartaric acid derived
compounds. They further provide equivalent wear protection compared
to conventional GF-3 formulations (C3), which has higher
phosphorous.
[0086] Each of the documents referred to above is incorporated
herein by reference. Except in the Examples, or where otherwise
explicitly indicated, all numerical quantities in this description
specifying amounts of materials, reaction conditions, molecular
weights, number of carbon atoms, and the like, are to be understood
as modified by the word "about." Unless otherwise indicated, each
chemical or composition referred to herein should be interpreted as
being a commercial grade material which may contain the isomers,
by-products, derivatives, and other such materials which are
normally understood to be present in the commercial grade. However,
the amount of each chemical component is presented exclusive of any
solvent or diluent oil, which may be customarily present in the
commercial material, unless otherwise indicated. It is to be
understood that the upper and lower amount, range, and ratio limits
set forth herein may be independently combined. Similarly, the
ranges and amounts for each element of the invention can be used
together with ranges or amounts for any of the other elements. As
used herein, the expression "consisting essentially of" permits the
inclusion of substances that do not materially affect the basic and
novel characteristics of the composition under consideration.
* * * * *