US3940339A
Expired / Lapsed
US
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Lithium borate complex grease exhibiting salt water corrosion resistance
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1975-01-21
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Granted: 1976-02-24
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Expires: 1995-01-21
Abstract
Abstract A lubricating grease having an exceptional ability to protect metal bearing surfaces against rusting or corrosion in the presence of salt water contains a synergistic combination of a lithium complex grease thickener, a quaternary ammonium nitrate and an amino imidazoline. The grease thickener is a complex of a lithium soap of a C12 to C24 hydroxy fatty acid and a monolithium salt of boric acid, and can include as a third component a lithium salt of a second hydroxycarboxylic acid such as salicyclic acid
Inventors
- 👤 George A. Clarke, Jr.
- 👤 Gary L. Harting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:25
CPC Classifications
C; C10; C10M; C10M5/00; C10M2201/00; C10M2201/087; C10M2207/00; C10M2207/10; C10M2207/12; C10M2207/121; C10M2207/124; C10M2207/125; C10M2207/14; C10M2207/141; C10M2207/142; C10M2207/144; C10M2207/146; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/06; C10M2215/064; C10M2215/065; C10M2215/22; C10M2215/223; C10M2215/224; C10M2215/24; C10M2215/26; C10N; C10N2010/00; C10N2010/02; C10N2040/00; C10N2040/02; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
148 words
A lubricating grease composition of high dropping point and capable of protecting metal surfaces against salt water corrosion which comprises a major proportion of a mineral lubricating oil, from about 2 to 30 wt. % of a thickener system whose essential components include a lithium soap of a C 12 to C 24 hydroxy fatty acid and a monolithium salt of boric acid, wherein there are from 3 to 100 parts by weight of hydroxy fatty acid per part by weight of boric acid, and a salt-water-corrosion resisting amount of a combination of a dialkyl dimethyl ammonium nitrite, wherein the alkyl groups have 8 to 18 carbon atoms, and an amino imidazoline of the general structure: ##EQU3## wherein n is about 2 to 6, R is a C 6 to C 22 aliphatic hydrocarbon group and R' is hydrogen or a C 1 to C 12 alkyl group.
Claim 2
Dependent Claim
148 words
A lubricating grease composition of high dropping point and capable of protecting metal surfaces against salt water corrosion which comprises a major proportion of a mineral lubricating oil, from about 2 to 30 wt. % of a thickener system whose essential components include a lithium soap of a C 12 to C 24 hydroxy fatty acid and a monolithium salt of boric acid, wherein there are from 3 to 100 parts by weight of hydroxy fatty acid per part by weight of boric acid, and a salt-water-corrosion resisting amount of a combination of a dialkyl dimethyl ammonium nitrite, wherein the alkyl groups have 8 to 18 carbon atoms, and an amino imidazoline of the general structure: ##EQU3## wherein n is about 2 to 6, R is a C 6 to C 22 aliphatic hydrocarbon group and R' is hydrogen or a C 1 to C 12 alkyl group.
Claim 3
Dependent Claim
18 words
Composition as defined by claim 1 wherein in the general formula R' is hydrogen and n is 2.
Claim 4
Dependent Claim
77 words
Composition as defined by claim 1 wherein the thickener system also includes as a third component a lithium salt of a second hydroxycarboxylic acid of from 3 to 14 carbon atoms, wherein the hydroxy group is attached to a carbon atom not more than 6 carbon atoms removed from the carboxyl group, and wherein there is a weight ratio of from about 0.1 to about 10 parts of said second hydroxycarboxylic acid per part of boric acid.
Claim 5
Dependent Claim
15 words
Grease composition as defined by claim 1 wherein said hydroxy fatty acid is 12-hydroxystearic acid.
Claim 6
Dependent Claim
15 words
Grease composition as defined by claim 3 wherein said second hydroxycarboxylic acid is salicyclic acid.
Claim 7
Dependent Claim
32 words
Grease composition as defined by claim 1 wherein said dialkyl dimethyl ammonium nitrite is a dialkyl dimethyl ammonium nitrite wherein the alkyl groups are principally C 12 and C 14 alkyl groups.
Claim 8
Dependent Claim
17 words
Grease composition as defined by claim 1 wherein the amino imidazoline is mixed heptadecenylheptadecadienyl imidazoline ethylene diamine.
References Cited (Backward Citations)
US3758407A
Cited
US3842008A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |