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etented Sept 24’ 194
on. so
Herschel G. Smith, Wallingiord, and Troy L.
Cantrell, Lansdowne, Pa", and John G. Peters,
Audubon, N. 3., asslgnors to Gulf Oil Corpora
tion, Pittsburgh, Pa", a corporation oi’ Penn
No Drawing. Application ‘if ch 19, 1945,
Serial No. 583,658
8 Claims. (Cl. 252-35)
This invention relates to improved mineral oil
compositions, and more particularly to improved
oils and oil compositions each comprising a major
amount of mineral oil and a minor amount
of a new improvement agent, or mixture
of agents, capable of imparting a plurality of use-'
are substantially neutral trivalent metal salts of
ortho phthalamidic acids, containing two alkyl
groups attached tow the nitrogen atom thereof, one
being a hydroxylated alkyl group, and the other
a long chain alkyl group, as shownrby the above
ful, advantageous properties thereto; these im
as a class, the above metal salts are excellent
proved oll compositions being useful and advan
improvement agents for mineral oils and oil com
tageous in protecting metals, both ferrous and
posltionsand can be easily incorporated in such
non-ferrous metals, from rust, corrosion and 10 oil compositions, in proportions necessary for
wear. It also includes methods .of making such
present purposes. All of these improvement
agents and improved oil compositions containing
agents are readily and markedly soluble in min- '
the same.
eral oils,-partdcularly naphthenic type oils. In
As is well known, the simple straight mineral
deed, most of these are viscous oily liquids at or
oils usually are de?cient in one or more respects, 15 dinary temperatures and can be readily incor
for certain commercial uses and it is common
porated in para?‘lnic type mineral oils, as well as
practice to incorporate one or more "additive”
naphthenic and mixed. type base oils. Again,
compounds in the oil to overcome the defect or
some of them are waxy solids or oily semi-solids
at ordinary room temperature, 1. e. ‘75° F., but
defects thereof for certain uses. Likewise, vari
ous agents have been incorported in oils to im 20 soften or melt at elevated temperatures; they be
prove certain of their properties for particular or
ing viscous liquids at elevated temperatures be-'
special uses requiring a superior oil. In general,
low their decomposition point. Thus, in general,
such agents or additive compounds are known as
our improvement agents can be readily ?uxed or
improvement agents.
blended with a wide variety of mineral oils and
We have now discovered certain new improve 25 oil compositions and when incorporated therein
ment agents for mineral oils which are particu
improve various properties thereof;
larly advantageous in the commercial prepara
On the other hand, our new improvement
tion of various lubricants, protective coating com
agents are water-resistant compounds which are
positions and other useful mineral oil composi
practically insoluble in water and aqueous solu
tions. Our new agents can be readily incor 30 tions. That is, they have a combination of prop
porated in various mineral oils and oil composi
erties which render them particularly advantaa
tions. When incorporated therein, even in‘ very
geous for the purposes of this invention, as is
small amounts, these agents markedly improve
the rust preventive qualities thereof. Further,
they are also capable of imparting other useful
and advantageous properties to mineral oils and
oil compositions, as more fully described post.
Our. new and advantageous improvement
agents for mineral oils and oil compositions are
shown more fully post. ‘
Further, these improvement agents can be read
ily prepared by various methods, as described in
our companion copending application, Serial No.
608,100, ?led July 31, 1945, wherein we claim these
new oil-soluble metal salts and methods of mak
ing the same. ‘As there described, our new im
oil-soluble metal salts having the following 40 provement agents can be readily prepared, advan
tageou'sly in situ in mineral oil, directly from ‘tri
valent metal hydroxides, phthalic anhydride‘ and
secondary aliphatic amines having the following
formula: ‘
wherein R represents an alkyl group, advanta
geously a long chain group containing from 8 to
2G carbon atoms, and R," represents hydrogen or
' an alkyl group, advantageously a short alkly group
wherein M is a trivalent metal, such as aluminum,
etc., R is an alkyl group, and R’ represents an
such as methyl, ethyl, propyl, butyl and the like;
In turn, these secondary alkyl amines containing -
alhlol group. Thus, our improvement agents 55 a hydroml group attached to one of the alkyl
ing alkylene oxides such as ethylene oxide, pro
pylene oxide, butylene oxide and the like with
primary alkyl amines having the following tor
of sumcient mineral oil to dissolve the‘ oil-soluble
compound ‘so obtained; the new improvement
agents being formed in situ in the oil, as described
and illustrated in our said companion-applica
groups thereof can be readily prepared by react
tion Serial No. 608,100,
g '
Indeed in the practice of the present invention
we usually prepare the desired trivalent metal
salts in situ in mineral oil. The concentrated
wherein n is a number between'6 and 18. Some
solutions of neutral trivalent metal salts in oil
of the primary alkyl amines of this generic class
10 have certain advantages for the present pur
poses; they being themselves excellent improve
ment agents for imparting rust preventive qual
ities and other advantageous properties to a
Mono-capryl amine
Mono-lauryl amine
Mono-myristyl amine
Mono-palmityl amine
Mono-stearyl amine
wide range of ‘commercial compositions, such as
greases, waxes, petrolatum and petrolatum-like
coating compositions, as well as mineral oils and
oil compositions.
The following examples illustrate various meth
and other primary alkyl amines having the above
formula. Any of the above primary iatty amines
ods of preparing our improvement agents and
may be used witnadvantage in making the sec
ondary amines useful for the present purposes, as 20 lmprovedcompositions containing the same.
Example i'.—-In this example, a substantially
all of them readily react with propylene oxide and
aluminum salt was prepared, in situ in
similar alkylene oxides, as shown in our said com- .
mineral oil, directly from ‘phthalic anhydride,
panion application Serial No. 608,100. For in
dodecyl prcpanol amine and a commercial hy
stance, as there shown, mono-lauryl amine (pri
mary dodecyl amine) is useful and advantageous. 25 drated alumina, said hydrated alumina being a
gelatinous, aqueous paste containing ‘18 per cent
Likewise, primary hexadecyi amine (mono-pal
aluminum hydroxide; the oil-soluble salt so pre
mi'tyl amine) is also advantageous in preparing
secondary aliphatic amines useful for the present ' pared being a neutral aluminum salt of N-do
decyl, propanol ortho phthalamldlc acid and hav
purposm. Further, mixtures of such primary
amines may also be employed, somewhat better 30 ing the following formula:
products being obtained with mixed amines. For
instance, one commercially available mixture ‘of v
such primary fatty amines is the so—called "coco
amine." As stated in'the said copending appli
cation, commercial “cocoamine” has an average
molecular weight of 210 and contains a major
amount of lauryl amine admixed with minor
amounts of homologues thereof. This commercial
vfatty amine maybe employed with advantage in
preparing secondary aliphatic amines useful in 40
making our improved oil-soluble trivalent metal
salts of ortho phthalamidic acids ‘by the advan
tageous methods set forth in our copending ap
plication Serial No. 608,100.
Processes of making secondary N-propanol N
alkyl amines by reacting equimolecular propor
- tions of propylene oxide and a long chain pri
mary aliphatic amine are claimed in our copend
The procedure in preparing this improvement
ing application, Serial No. 640,128, ?led January
agent was asfollows:
To 2390 grams of 70 viscosity Texas oil ‘were
added 444 grams of phthalie anhydride and the
mixture vigorously stirred to disperse the phthal
ic anhydride ln-the oil. 'I'hen,'while continuing
the stirring, 804 grams of n-dodecyl, isopropanol
amine were gradually added to the oil mixture,
the temperature of the mixture being maintained
‘at approximately 150°- F. during the addition of
9, 1946, as a continuation-in-part of the present Ml
Further, as shown in our said copending appli
cation, in so preparing our agents from such sec
ondary amines, phthalic anhydride and trivalent
metal hydroxide, those chemicals are reacted to
gether and converted into new compounds; they
being chemically combined together in the molec
amines with phthallo anhydride in substantially
the amine. After all the amine was added, the
reaction mixture was heated to between 150 and
180° F. until the reaction was substantially com
pleted; that is, until the-amine-had reacted with
the phthalic anhydride and converted it into the
equimolecular amounts. to form a mono-amide of
corresponding ortho phthalamidic acid. I
ular ratios necessary to produce our new substan
tially neutral oil-soluble‘ trivalent metal salts hav
ing substantially the generic structure given ante.
In doing so, we usually react said secondary
phthalic acid, namely, the desired N-alkyl, alkylol
ortho phthalamidic acid, and then neutralize the
residual acidity of that compound by reaction‘
The oil solution of the N-alkyl, alkylol phthal
65 amidic acid so obtained was a semi-viscous liq-
uid; this phthalamidic acid being readily solu
ble in mineral oils and being easily converted
into metal salts,‘ advantageously neutral alumi
droxide being employed to form substantially neu
num salts, as follows:
tral aluminum salts thereof. In lieu of'hydrated
alumina or aluminum hydroxide, other hydrox 70 In doing so, 78 grams of aluminum hydroxide,
ides and oxides of trivalent metals, such as bis- ' .in the form of aqueous, gelatinous paste, was
admixed with. the'olly solution of the phthal
muth, etc., may be employed in making our neu
with hydrated alumina, sufficient aluminum hy-_
tral 'trivalentmetal salts. - Further, in so prepar
amidic acid obtained ante‘.
This mixture was
then heated and the temperature gradually raised
ing these trivalent metal salts, these reactions
can be advantageously eiiected in the presence 75 to ‘240° F. over the, course of two hours. The
mixture was then held at that temperature to
complete the reaction and dehydrate the oil
solution of neutral aluminum salt so obtained.
The oil solution of anhydrous aluminum salt
so obtained was then ?ltered hot to remove any 5
insoluble matter present.
The ?ltrate so obtained is an excellent im-_
provement agent for present purposes; it being a
concentrated solution of the said neutral alu
minum salt in the mineral oil. It contained. 10
approximately 33 per cent by weight of said
aluminum salt. Nevertheless, it was an oily,
mobile liquid at room temperature. This clearly
and the mixture was vigorously stirred to dis
perse the phthalic anhydride in the‘oil. Then,
804 pounds of the secondary fatty propanol
amines obtained in Example II were gradually
added to the oil mixture while continuing the
stirring; the amines being gradually added and
the temperature being maintained at approxi
mately 150° F. during this time. After all the
amines were added, the reaction mixture was
heated to between 150 and 180° F. until the re
actions were substantially complete. Next, 436
pounds of a commercial, gelatinous paste of hy
drated alumina, containing 18 per cent of alu
shows the high solubility of our, new trivalent
minum hydroxide, were gradually admixed with
metal salts in mineral oils.
15 an oil solution of N-alkyl, alkylol phthalamidic
That is, the foregoing example is typical and
acids obtained ante. After thoroughly incorpo
illustrative of certain embodiments of this in
rating the hydrated alumina paste in this mix
vention. In other embodiments thereof, other.
ture, the mixture was then heated to 240° F.; the
secondary alkyl, alkylol amines can also be em
temperature being gradually raised to quietly boil
ployed in making our improvement agents, as
off the free water. Then the mixture was held at
stated ante. For instance, in'Example 1, other
240 to 250° F. ‘to complete the reaction and fully
secondary amines such as dodecyl butanol amine,
dehydrate the oil solution of neutral aluminum
hexadecyl propanol amine and the like may be
saltsyso obtained.
employed in lieu of dodecyl propanol amine.
The oil solution of anhydrous aluminum salts
Further, mixtures of such secondary alkyl, alkylol
so obtained was then ?ltered while hot to re
amines may likewise be employed with advantage,
move any insoluble matter.
as illustrated in the following examples:
Example II.—-This example illustrates the
preparation of a mixture of secondary amines
The ?ltrate so obtained is an excellent improve
ment agent for the present purposes. It was an.
oily mobile liquid at room temperature and had
‘which are useful in making our oil-soluble metal 30 the following properties:
salts; this mixture of secondary alkyl, alkylol
Gravity: ° A. P,I______________________ __
amines being typical and advantageous for the
Viscosity, SUV:
present purposes and being prepared from pro
100° F ____________________________ __ ‘301.0
pylene oxide and commercial “cocoamine."
__________________________ _.'____ 54.0
Into a suitable reaction vessel, equipped with 35
Color, NPA
Ash as sulfate ___________ __‘ ___________ __
agitating the charge, there were charged 840
pounds of commercial cocoamine and then 232
It was a concentrated solution of substantially
pounds of propylene oxide were gradually added
neutral aluminum salts of the ortho phthalamidic
to the amine with stirring- After the reactants 40 acids derived from said secondary amines. This
were intimately admixed, the mixture was gradu
oil solution contained approximately 33 per cent
ally heated to approximately 35° C. under re?ux,
by weight of said aluminum salts. Nevertheless,
the heating under reflux being continued for
it was an oily mobile liquid at room temperature.
about 15 hours to complete the reaction.
This clearly shows the high solubility of such
a re?ux condenser and means for heating and
The reaction product so obtained was a, homo
salts in mineral oils.
geneous, clear, semi-viscous liquid comprising a
This improvement agent had a good color and
mixture of secondary fatty propanol amines con
was substantially free of insoluble matter. It
taining a major amount of lauryl propanol amine.
was readily miscible with various mineral oils
This mixture of secondary amines is useful and
and oil compositions and was directly soluble in
advantageous in preparing a wide variety of our 50 most mineral oils in a manner effective for the
new oil-soluble improvement agents. It readily
present purposes. In particular, this improve
reacts with phthalic anhydride to form N-allryl,
ment agent is useful and advantageous as an
alkylol ortho phthalamidic acids which in turn
additive compound in preparing improved motor
can be readily converted into various metal salts
oils and like lubricants. It is also advantageous
by reaction with trivalent metal hydroxides.
in preparing other improved oil compositions use
The preparation of one advantageous improve
ful in protecting metals against abrasion and
ment agent from this mixture of secondary fatty
propanol amines is illustrated in the following
That is, the foregoing Examples I and III, re
spectively, are typical and illustrative of our new
Example III .-In this example, a. substantially 60 improvement agents and methods of making the
neutral aluminum salt was prepared, in situ in a
same which are advantageous in certain embodi- ‘
light mineral lubricating oil, directly from phtha
ments of this invention. In other embodiments
lic anhydride and commercial hydrated alumina,
thereof, we may also employ various other triva
and the mixture of secondary amines obtained in
lent metal hydroxides and secondary amines con
Example II ante; the mineral oil being a 70 vis 65 taining an alkylol group in making our improve
I cosity Texas oil having the following properties:
ment agents, as stated ante. For instance, the
hydroxides of bismuth and other trivalent metals
Gravity: ° A. P. I _______________________ __ 25.8
may. be used in Examples I and Ill ante, in lieu
Viscosity, SUV:
aluminum hydroxide, to produce still other ad
100° F
74.0 70 of
vantageous improvement agents.
To 2542 pounds of the said mineral oil there
In fact, by the present invention a wide range
of improvement agents can be readily‘ prepared in
the generic practice thereof. All of them are
readily soluble in commercial mineral oils and oil
were added 444 pounds of phthalic anhydride,
compositions in the proportions required to effect
In preparing this advantageous improvement
agent, the following procedure was employed:
the desired improvements. Indeed, a wide range
of improved anti-rust lubricants can be readily
prepared by incorporating minor amounts of our
improvement agents in suitable oils and oil com
Base oil
Gravity: ° A. l'. I____' _____________________ -_
positions. In general, suchvimproved anti-rust
_ 100° i‘ _________________________________ _.
32. B
210° ___________________________________ __
Neutralization No ________ _; _____________ _-
0. 01
ferrous metals against rusting and corrosion, even
when exposed to salt water and other severe
Viscosity SUV:
lubricants eifectively protect ferrous and non
As shown by the above tabulation of properties,
For instance, advantageous anti-rustlubricants 10 the incorporation of this improvement agent‘in
the base 011 did not substantially change the
can be prepared by dissolving in light lubricating
physical properties thereof.
oils small amounts of the products obtained in
However, the improved' oil so obtained had
Examples I and III ante.
Further, the concentrated solutions of the .alu- ' ' markedly- improved rust-preventive qualities.
,For instance, when subjected to various standard
minum salts in oil, obtained in Examples I and ~
‘corrosion tests, it completely, inhibited rusting
III, are directly useful as rust preventive coating
of the ‘metal, whereas the base oil gave little or
. no protection against rust. In one such set of
non-corrosive to both ferrous and non-ferrous
comparative‘tests the following data were ob
metals. When applied to such metals, they
tightly adhere to the metal forming a protective 20
coating thereon which is resistant to water and
compositions for metals. They are substantially I
I Corrosion test, ASTM 1) 666-42 '1"
aqueous liquids and fully protects‘ the metal
mpgi‘lwed 'Base oil
against rust or corrosion, even when exposedto
Distilled water-steel strip’
the most drastic conditions. That is, our new
oil-soluble metal salts are very potent rust pre 25
ventive compounds. Accordingly, they carnalso
be compounded with various other materials in
preparing a wide range of protective coating com
, positions for metals. In particular, they are
Appearance ............ _--.___. ........ ._
Area rusted, percent .................. ._
Synthetic sea water-steel strip:
100 ,
The said corrosion tests employed were‘ stand
readily soluble in various hydrocarbon oils, par .30 ard tests for determining the rust- preventive
ticularly mineral lubricating oils.‘ Further, they
properties of commercial. mineral oils and oil
are also readily miscible with waxes, petrolatum
and greases, as well as oil compositions.
As shown by the test data ante, our improved
Thus, our new improvement agents, such as
anti-rust oil had outstanding rust-preventive
obtained in Examples I and 111, are useful in pre 35 properties and satisfactorily passed said tests,
paring a wide range-of compositions having ex
particularly the drastic test-with sea water.
ceptional rust preventive properties; they being
In view of their outstanding anti-rust proper-.
particularly advantageous in preparing improved
' ties and other advantageous properties shown
anti-rust lubricants to which they impart fur
ante, our improvement agents are useful and ad
ther advantageous properties as shown post. 40 vantageous in-a wide range of commercial oil
Such improved lubricants can be readily obtained - .compositions. They may also be incorporated in
by incorporating small amounts of our- improve
minor amounts in other types of oils, such as
ment agents-in mineral lubricating oils, greases,
turbine oils, instrument oils, electric motor oils
petrolatum and the like. For instance, the im
and other high quality lubricants where it is im- ,
provement agents obtained in Examples I and
portant to protect metal surfaces from rust and
III are readily "soluble in commercial mineral
lubricating oils and when dissolved therein, even
corrosion, as well as adequate lubrication thereof
under service conditions.
in small quantities, markedly improve various
For example, improved turbine oils can be
properties of such oil. For example, the mineral
readily prepared by dissolving 0.03 to 3.0 per cent
lubricating oils containing from 0.1 to 1.0 per 50 of our improvementagents, such as obtained in
cent by weight of such improvementagents have
Examples I and‘ III, ‘in any of the commercial
increased resistance to oxidation and deteriora
turbine oils.
tion, as well as improved rust preventing or cor
proved turbine oil is illustrated in the following
rosion preventing properties.‘
The following example illustrates the prepara
tion ofsuch improved lubricants and methods of
making the same:
Example IV.—In this example, one such ad;
vantageous anti-rust lubricant containing 0.1 per
cent of the substantially neutral aluminum salts
obtained in Example III ante, dissolved in a com
mercial mineral lubricating oil was prepared as '
Example V.--In this example, an improved
turbineoil was prepared by dissolving 0.15 per
cent of the ?ltrate obtained in Example III in a
suitable well-re?ned mineral lubricating oil. The
improved lubricating oil contained 0.05 per cent
of the substantially neutral aluminum salts of the
phthalamidic acids obtained in Example III.
The properties of this improved lubricant and
the base oil employed in making the same were
as follows:
‘Into a suitable vessel, with means for agitat
The preparation of one such im
ing .the charge‘, there were charged 1,000 parts
of the commercial lubricating oil, and then 3.0
parts by weight of the ?ltrate obtained in Exam- ple I were added to the oil with stirring. Stir
. ring was continued until the improvement agent
Gravity: ° A. P. I _____________ __' __________ -_
Vlscoggty SUV:
32. 5
32 6
................................. _.
was uniformly and homogeneously blended with
Fire, 0(‘- ° °FF
the oil. The properties of the improved oil and
Pour:y° F ____ __
ColorI NPA _______ __
Neutralization N o _ _
l. 25
0. 02
0. 0i
the base oil employed in making the same were
as follows:
The above improved turbine oil‘, with this
this invention relates to improved mineral oil
compositions containing minor amount of sub
markedly low dosage of our highly e?ective cor
rosion preventive agent, and without the addi
stantially neutral trivalent metal salts ‘of N-alkyl,
tion of any supplemental corrosion preventive
alkylol ortho phthalamidic acids, as a new and
agent, successfully passed without any traces of 5 advantageous improvement agent; the amount
of such improvement agent being su?icient to
rusting, the above described steel strip corrosion
impart thereto the advantageous properties de
In general, our improvement agents have
sired. In general, our improved oil compositions
proven to be quite satisfactory addition agents
usually contain from 0.01 tov 10.0 per cent‘ by
for turbine oils; particularly for compounded 10 weight of such improvement agents dissolved in
the mineral oil.
turbine oils of higher viscosity types, such as are
This application is a continuation-in-part of
preferred for marine service.
our prior application Serial No. 566,402, ?led De
In other words, the plurality of advantageous
cember 2, 1944, which became U. S. Patent No.
properties can be imparted to turbine oils by in
corporating our new improvement agents there 15 2,378,443 on June 19, 1945, which also relates to
improved oil compositions and methods of mak~
in. Likewise, similar improvements can be ob
ing the same.
tained in other types of lubricants by incorporat
In our said prior application, we have described
ing our new agents in various oils and oil com
and claimed improved 'mineral oil compositions
For example, our new agents are also useful 20 containing a minor amount of oil-soluble alu
minum phthalyl alkyl amide compounds hav
ing the following formula:
and advantageous in preparing improved motor
oils for lubricating automotive, aviation and
Diesel engines. Such improved oils can be read
ily prepared by incorporating a few per cent. of
these improvement agents in a suitable mineral 25
lubricating oil; usually 0.3 to 3.0 per cent by
weight of the oil." The compounded oils so ob
tained have improved detergent properties as
well as other advantageous properties. In gen
eral, such improved motor oils containing minor 30
amounts of our agents have a plurality of ad
vantageous properties. In addition to protect
ing metals from rust and corrosion, they have
superior lubricating properties, even under se
vere operating conditions.
In particular, this invention relates to improved
lubricating oils containing a multifunctional im
provement agent having anti-oxidant and other
advantageous properties such as high ?lm
‘wherein R represents an alkyl group containing 8
to 20 carbon atoms. Such oil-soluble compounds
can be readily produced from the reaction or
fstrength. Moreover, the lubricating oils to which 4 O inter-action of aluminum hydroxide, phthalic an
our inhibitor is added are capable of retarding
hydride and primary alkyl amines, advantage
the formation of all forms of gum, resins, carbon,
ously in situ in mineral oil, as described and illus
and varnish-like materials which are usually
trated in our prior application. As there shown,
formed on the pistons and rings of internal com
the improvement agents so obtained impart a
bustion engines. In addition to the property of 45 plurality of valuable properties to mineral oils
being able to inhibit the formation of products
and oil compositions and‘ are advantageous for
capable of corroding sensitive metallic bearings
such purposes.
normally found in internal combustion engines
The oil-soluble aluminum phthalyl alkyl amide
or other metals contacted with the oil, all oils
compounds employed in our prior application are
containing our improvement agents and minor 50 substantially neutral‘ aluminumsalts of a ‘mono
proportions of Water or salt water are inhibited
alkyl amide of phthallc acid, as shown by the
against corrosion tendencies. That ‘is, our im
above generic formula. They are also designated
proved lubricating compositions comprising ‘a
as aluminum N-alkyl amido phthalates, as stated
major amount of a petroleum lubricating oil and
in our prior application. However, as is evident
a minor amount of our new additive compounds
from the above formula, these oil-soluble salts
have improved detergent, anthoxidant and other
are substantially neutral trivalent metal salts of
advantageous properties.
ortho phthalarnidic acids containing a long chain
That is, our new improvement agents impart
alkyl group attached to the nitrogen thereof,
to mineral oil compositions a plurality of ad- which carries a reactive hydrogen attached
vantageous properties which render them par 60 thereto.
ticularly advantageous for such purposes. For
The oil-soluble salts employed in the present
instance, these improved oil compositions tightly
invention are substantially neutral trivalent
adhere to the metal, forming protective ?lms
metal salts of ortho phthalamidic acid contain
thereon which are substantially impervious to
65 ing an alkylol group attached to the nitrogen
water and aqueous solutions and which are re
atom thereof, in addition to the long chain alkyl
sistant to removal, from the metal even when
group attached thereto. Thus, so to speak, our'
vigorously agitated with aqueous liquids. That
new improvement agents are alkylol derivatives
is, our improved oil compositions are markedly
of the improvement agent set forth in our prior
resistant to water and aqueous solutions, as well
as stable against oxidation.
70 application. Indeed, they can be prepared by re
acting said neutral aluminum phthalyl alkyl
Accordingly, in the broad practice of this in
amides with propylene oxide and similar alkylene
vention a Wide range of_ improved mineral oil
oxides; thereby substituting an alkylol group for
compositions can be readily prepared, including
excellent protective coating compositions, as well
as improved anti-rust lubricants. Thus, broadly,
the hydrogen attached to the nitrogen atom into '
the ortho phthalamidic salt shown in our prior
2,408,102 '
11 ‘
. sin-inhibiting properties to the improved oil
' 2. The composition of claim 1 wherein the said
11- -n
C- -CHr(CHr).-CH: '
mineral oil composition 'contains from 0.01 to 10.0
per cent by weight of said improvement agent
‘dissolved in the mineral oil.
10V 3. The improved composition of claim 1 where
in the said oil-soluble metal salt is an alumin
4. The improved composition of claim 1 where
in the said oil-soluble metal ‘salt is a substantially
neutral aluminum salt of N-dodecyl propanol -
mc-(cnsrcnrn n
group and R’ is an alkylol group. and the amount
of said metal salt being su?icient to impart corro
nio-o-o'n '
wherein M is a trivalent metal. R is an alkyl
.pplication. The new metal salts so obtained may
e represented by the following formula:
ortho phthalamidic acid.
no- -cm
5. The improved composition of claim 1 where
in the said oil-soluble metal salt is a substantially
neutral aluminum salt of N-dodecylethanol orth
rherein M represents a trivalent metal. R" rep
esents hydrogen or‘an alkyl group, and n is a 20 phthalamidic acid.
6. The improved composition of claim 1 where
umber between 6 and 18. As a'_ class, these tri
in the said oil-soluble metal salt is a substan
alent metal salts are useful and advantageous
tially neutral aluminum salt of N-hexadecyl
or the present purposes. particularly the neu- butanol 'ortho phthalamidic acid.
ral aluminum salts having the above formula.’
7. An improved mineral oil composition com
That is, we have now found that by substituting
prising a major amount of a mineral lubricating
n alkylol group :Ior the hydrogen attached to
oil containing dissolved therein. from 0.01 to 10.0
he nitrogen atom oi.’ the ortho phthalamidic acid
per cent by weight oi! an’ oil-soluble, trivalent
alts shown in our prior application, Serial No.
metal salt'ot N-alkyl, alkylol phthalamidic acid,
66,402, now U. S. patent No. 2,378,443, we obtain
new and di?erent class of improvement agents 30. said metal salt having the following formula:
r‘ polyvalent metal salts which in addition to
aving greater solubility in mineral Oils also. have
ther modi?ed properties which render them par
icularly- useful as improvement agents for
iineral oils and oil compositions; these improve 35
ients being in part due to‘ the presence of the
lkylol group in the molecule of our new improve
1ent agents. The present application is broadly
irected to improved mineral‘ oil compositions
ontaining these new improvement agents.
What we claim is:
o o t ‘
' QE-o-Ilao-AQ
I 0:!
1. An improved mineral oil composition com
rising a major amount of a mineral oil and a
11110!‘ amount of an oil-soluble trivalent metal
nic-(cmn-cnriw H
H: 443-015 ‘HQ-é- H:
ilt of N-alkyl, alkylol ortho phthalamidic acid, 45
rid metal salt having the following iormula
wherein R" represents hydrogen or an alkyl
group, and n is a number between 6 and 20,
said improvement agent being substantially neu
50 tral and readily soluble in mineral oils.
8. The improved composition of claim 7 where
111;}the said oil-soluble metal salt is an aluminum
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