Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS2449025 A
Publication typeGrant
Publication dateSep 7, 1948
Filing dateJul 21, 1943
Priority dateJul 21, 1943
Publication numberUS 2449025 A, US 2449025A, US-A-2449025, US2449025 A, US2449025A
InventorsWilliam R Turner
Original AssigneeAtlantic Refining Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Rust-inhibiting lubricant
US 2449025 A
Previous page
Next page
Description  (OCR text may contain errors)

Patented Sept. 7, 1948 BUST-INHIBITING LUBRICANT William R. Turner, Drexel Hill. Pa.,'auignor to The Atlantic Refining Company, Philadelphia, Pa., a corporation of Pennsylvania No Drawing. Application July 21, 194:, Serial No. 495.193

4 Claims. 252-33) The present invention relates to lubricant comiting lubricants suitable for the lubrication of internal combustion engines, gears, cables, and other metal surfaces exposed to oxidizing conditions during use or storage.

It has been proposed heretofore to incorporate in engine lubricating oils, 9. small percentage of an alkaline earth metal sulfonate to function as a detergent and promote engine cleanliness. For ordinary use, quantities of the order of 0.25% to 1.5% of the sulfonate were effective to prevent deposition of oil sludge in the engines, but these percentages were insuificient to substantially inhibit or prevent rusting or corrosion of the internal metal surfaces of the engines. On the other hand, in the lubrication of heavy duty engines such as tractor, truck or bus engines, oils were employed which usually contained more than 1.5% of calcium sulfonate, i. e., of the order of 2% to 3% by weight, in addition to antioxidants or sludge inhibitors. Quantities of sulfonate within this range were sufficient, in general, to inhibit rusting of metal parts which were more or less continuously supplied with lubricant. However, for other purposes such as the lubrication of cables, gears, etc.,

and for coating the surfaces of machined, ground,

stamped or rolled metal parts, oils containing as much as 3% of the sulfonate were not always capable of inhibiting or preventing rust, particularly when such metal objects were used or stored under humid atmospheric conditions.

I have found that the rust-inhibiting properties of oils containing an alkaline earth metal sulfonate, and particularly calcium sulfonate, may be markedly improved by the incorporation therein of a relatively small quantity of an alcohol, preferably an aliphatic alcohol containing at least 5 carbon atoms. Exemplary of the alcohols which may be employed are the amyl alcohols, the hexyl alcohols, the heptyl alcohols, the octyl alcohols, the nonyl alcohols, the decyl alcohols, and the higher homologues thereof which are soluble in hydrocarbon oil to an appreciable extent. Other alcohols which are useful in the practice of this invention are the phenols, the alkylated phenols and particularly those having side chains of 3 to carbon atoms, hydroaromatic, heterocyclic, and naphthenic alcohols, and, in general, any relatively non-volatile alcohols which are compatible with oilalkaline earth sulfonate mixtures. The quantity of alcohol to be employed many vary, depending to some extent upon the quantity of sulionate utiabove, and the mixture is agitated suillciently to 2 lized, but I have found that from 0.01% to 3% of the alcohol or mixture of alcohols is usually sufllcient to accomplish the desired result.

In preparing the rust-inhibiting lubricants of the present invention, I may subject a suitable lubricating oil stock to treatment with a sulfonating agent such as concentrated sulfuric acid, fuming sulfuric acid, sulfur trioxlde, or chlorsulfonic acid, whereby through reaction with the oil, there are produced oil-soluble sulfonic acids and oil-insoluble acid sludge. After separation of the sludge, the oil containing the oil-soluble sulfonic acids may be neutralized with an aqueous slurry of lime or with dry lime in the presence of steam at an elevated temperature of, for example, F. to 230 F. The neutralized oil containing calcium petroleum sulfonates may be freed of insoluble solids such as calcium sulfate, excess lime, etc., by filtration preferably after removal of moisture by air blowing at 180 F. to 220 F. If the resulting oil contains too little calcium sulfonate, concentration thereof may be effected by distillation at reduced pressure to remove a portion of the oil. Alternatively, if the oil contains too great a concentration of sulfonates, it maybe diluted with additional oil to the desired concentration. To the resulting product is added a small amoimt of an alcohol of the character set forth hereinproduce a homogeneous solution of oil, calcium sulfonate, and alcohol. In general, the rust-inhibiting lubricant thereby produced may contain from 0.25% to 3% of calcium sulfonate and 0.01% to 3% of alcohol. If desired, alkaline earth metal sulfonates other than calicum sulfonate may be employed, such as the oil-soluble sulfonates of barium, strontium, and magnesium.

The lubricants of this invention may contain, in

addition, fatty oils such as rapeseed oil, sperm oil, solubilized castor oil, etc., or such lubricants may be thickened to the consistency of grease by the incorporation of suitable soaps.

My invention may be further illustrated by the following examples, which, however, are not to be construed as limiting the scope thereof. The test employed to determine the rust-inhibiting properties of the lubricants comprised immersing a brightly abraded iron strip momentarily in a 0.1% aqueous solution of hydrobromic acid, and then immersing the strip, without drying, in a sample of the lubricant, and thereafter allowing it to drain for 4 hours in contact with the atmosphere. The base oil used was a solvent refined lubricating oil having a Saybolt Universal viscosity of 503" at 100 F. and an A. P. I. gravity of 28.

Per cent Appear- Per cent Per cent Base Oil Ca sulance of mm Hexanol Decanoi Strip 0. 00 0. 00 0. 00 rusted 0. 25 0. 00 0. 00 Do. l. 50 0. 00 0. 00 Do.

0.25 0.25 0. 00 no rust l. 50 1. 50 0. 00 Do.

503 Vis. 0il+l.5% Zn salt l. 50 0. 00 0. 00 rusted.

of a cyclo-hexyl ester of dithlophosphoric acid.

Do i. 50 0.75 0. 00 no rust Do 1. 50 0. 00 0. 25 Do.

503 Vis. Oii+l.0% Zn salt 0. 25 0. 00 0. 00 rusted of a cyclo-hexyl ester of dithiophosphorlc acid.

Do 0. 25 0. 00 0.01 no rust. D0 0.25 0.00 0.05 D0. D0 0.25 0. 00 0.10 D0. D0 0. 25 0. 00 0. 25 Do.

Per cent Ca suli'onate Appearance of strip Per cent Base on Hexanol rusted.

0. 00 0. 75 no rust.

From the above examples, it will be seen that the addition of relatively small quantities of an alcohol to an oil containing an alkaline earth metal sulfonate renders the product capable of inhibiting rusting. The alcohol to be employed will depend to some extent upon the service to which the oil will be put, 1. e.. for lubrication at ordinary temperatures the alcohol may be relatively low boiling, whereas for lubrication at high temperatures, a relatively high boiling alcohol is preferred.

I claim:

1. A rust-inhibiting lubricant comprising hydrocarbon lubricating 011, 0.25% to 3% of an alkaline earth metal petroleum sulfonate, and 0.01% to 3% of a pure aliphatic alcohol containing at least 5 carbon atoms.

2. A rust-inhibiting lubricant comprising hydrocarbon lubricating oil, 0.25% to 3% of calcium. petroleum sulfonate, and 0.01% to 3% of a pure aliphatic alcohol containing at least 5 carbon atoms.

3. A rust-inhibiting lubricant comprising hydrocarbon lubricating oil, 0.25%to 3% of calcium petrogeum sulfonate, and 0.01% to 3% of hexanol.

4. rust-inhibiting lubricant comprising hydrocarbon lubricating oil, 0.25% to 3% of calcium petroleum sulfonate, and 0.01% to 3% decanol.


REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,690,768 Burwell Nov. 6, 1928 1,690,769 Burwell Nov. 6, 1928 1,863,004 Burwell June 14, 1932 2,108,643 Brunstrum "Feb. 15, 1938 2,122,593 Stafford July 5, 1938 2,231,301 Smith Feb. 11, 1941 2,270,577 Bergstrom Jan. 20, 1942 2,285,752 Van Ess June 9, 1942 2,354,547 Richardson July 25, 1944 2,373,787 Sharp Apr. 17, 1945 2,383,033 Adams Aug. 21, 1945

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1690768 *Sep 13, 1922Nov 6, 1928Alox Chemical CorpOxidation of hydrocarbons
US1690769 *May 31, 1923Nov 6, 1928Alox Chemical CorpProcess of making organic acids from petroleum hydrocarbons and product
US1863004 *Dec 18, 1928Jun 14, 1932Alox Chemical CorpLubricant and process of making the same
US2108643 *Dec 31, 1935Feb 15, 1938Standard Oil CoGrease
US2122593 *Mar 5, 1935Jul 5, 1938Henry A StaffordTreatment of textile fibers
US2231301 *Nov 1, 1939Feb 11, 1941Gulf Oil CorpLubricating composition
US2270577 *May 31, 1940Jan 20, 1942Shell DevCompounded lubricating oil
US2285752 *Nov 18, 1940Jun 9, 1942Shell DevAnticorrosive
US2354547 *Aug 30, 1941Jul 25, 1944Standard Oil Dev CoLubricating oil composition
US2373787 *Jun 24, 1943Apr 17, 1945Standard Oil CoSlushing compositions
US2383033 *Nov 2, 1942Aug 21, 1945Standard Oil CoLubricants
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2533303 *Oct 9, 1947Dec 12, 1950Sinclair Refining CoPrevention of rust
US3931021 *May 17, 1974Jan 6, 1976Exxon Research And Engineering CompanyMethod for controlling viscosity of lubricating oils
U.S. Classification508/416
Cooperative ClassificationC10M2207/404, C10N2250/10, C10M2207/40, C10N2230/12, C10M2219/044, C10N2210/02, C10M2207/023, C10M2207/021, C10M2207/402, C10M1/08, C10M2223/045
European ClassificationC10M1/08