US4376711A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricant composition
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1978-09-15
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Granted: 1983-03-15
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Expires: 1998-09-15
Abstract
Abstract An additive combination comprising a hydroxysubstituted ester of a polycarboxylic acid and a metal dihydrocarbyl dithiophosphate and lubricating compositions comprising the same. The lubricating compositions comprising these additives exhibit improved anti-friction and anti-wear properties. Best results are achieved when the ester is obtained from a dimer acid and particularly a dimer of a fatty acid containing conjugated unsaturation. The metal used in the metal dialkyl dithiophosphate must be one having a relatively soft metal oxide and particularly a metal oxide having a Mohs hardness of about 3 or less.
Inventors
- 👤 Harold Shaub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:52
CPC Classifications
C; C10; C10M; C10M161/00; C10M141/00; C10M141/10; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/027; C10M2207/28; C10M2207/287; C10M2207/288; C10M2207/289; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2209/086; C10M2209/10; C10M2209/103; C10M2209/104; C10M2209/105; C10M2209/106; C10M2209/109; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/06; C10M2215/064; C10M2215/065; C10M2215/24; C10M2215/26; C10M2217/00; C10M2217/04; C10M2217/046; C10M2217/06; C10M2219/00; C10M2219/04; C10M2219/044; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/045; C10M2223/10; C10N; C10N2010/00; C10N2010/04; C10N2010/10; C10N2010/12
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
141 words
A lubricating oil composition comprising a base oil, from about 0.01 to about 1.0 parts by weight of an hydroxy-substituted ester of a polycarboxylic acid with a glycol per 100 parts of base oil, said acid having a hydrocarbon portion containing from about 9 to about 42 carbon atoms between carboxyl groups and said glycol is selected from the group consisting of alkylene glycols having from about 2 to about 12 carbon atoms and polyalkylene glycols having from about 4 to about 200 carbon atoms and from about 0.01 to about 5.0 parts by weight, per 100 parts of base oil, of a metal dialkyl dithiophosphate, wherein the alkyl portion of said metal dialkyl dithiophosphate contains between about 1 and about 18 carbon atoms and said metal is a metal whose oxide exhibits a Mohs hardness of about 3.0 or less.
Claim 2
Dependent Claim
141 words
A lubricating oil composition comprising a base oil, from about 0.01 to about 1.0 parts by weight of an hydroxy-substituted ester of a polycarboxylic acid with a glycol per 100 parts of base oil, said acid having a hydrocarbon portion containing from about 9 to about 42 carbon atoms between carboxyl groups and said glycol is selected from the group consisting of alkylene glycols having from about 2 to about 12 carbon atoms and polyalkylene glycols having from about 4 to about 200 carbon atoms and from about 0.01 to about 5.0 parts by weight, per 100 parts of base oil, of a metal dialkyl dithiophosphate, wherein the alkyl portion of said metal dialkyl dithiophosphate contains between about 1 and about 18 carbon atoms and said metal is a metal whose oxide exhibits a Mohs hardness of about 3.0 or less.
Claim 3
Dependent Claim
26 words
The composition of claim 1 wherein the metal in said metal dialkyl dithiophosphate is selected from the group consisting of antimony, bismuth, arsenic, molybdenum and cadmium.
Claim 4
Dependent Claim
15 words
The composition of claim 1 wherein the metal in said metal dialkyl dithiophosphate is antimony.
Claim 5
Dependent Claim
35 words
The composition of claim 1 wherein from about 0.1 to about 1.0 parts by weight of said ester and from about 0.1 to about 5.0 parts by weight of said metal dialkyl dithiophosphate is used.
Claim 6
Dependent Claim
37 words
The composition of claim 4 wherein said acid has a hydrocarbon portion containing from about 16 to about 22 carbon atoms between carboxyl groups and said polyalkylene glycols have from about 4 to about 100 carbon atoms.
Claim 7
Dependent Claim
24 words
The composition of claim 1 wherein said hydroxy substituted ester is the ester of a glycol and the dimer of a conjugated fatty acid.
Claim 8
Dependent Claim
22 words
The composition of claim 5 wherein said alkyl groups in said metal dialkyl dithiophosphate contain between about 2 and 8 carbon atoms.
Claim 9
Dependent Claim
24 words
The composition of claim 7 wherein said hydroxy substituted ester is the ester of a glycol and the dimer of a conjugated fatty acid.
Claim 10
Dependent Claim
26 words
The composition of claim 8 wherein the metal in said metal dialkyl dithiophosphate is selected from the group consisting of antimony, bismuth, arsenic, molybdenum and cadmium.
Claim 11
Dependent Claim
15 words
The composition of claim 1 wherein the metal in said metal dialkyl dithiophosphate is antimony.
Claim 12
Dependent Claim
35 words
The composition of claim 10 wherein from about 0.1 to about 0.5 parts by weight of said ester and from about 0.5 to about 1.5 parts by weight of said metal dialkyl dithiophosphate is used.
Claim 13
Dependent Claim
35 words
The composition of claim 4 wherein said acid is the dimer acid of linoleic acid, oleic acid or the mixed dimer of linoleic and oleic acids and said glycol is ethylene glycol or diethylene glycol.
Claim 14
Dependent Claim
21 words
The composition of claim 9 wherein said glycol is an alkylene glycol having from about 2 to about 5 carbon atoms.
Claim 15
Dependent Claim
35 words
The composition of claim 9 wherein said glycol is ethylene glycol or diethylene glycol and said dimer acid is the dimer of linoleic acid, oleic acid or the mixed dimer of linoleic and oleic acids.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-14 | 1986-09-13 | 1987-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-14 | 1990-09-13 | 1991-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-14 | 1994-09-13 | 1995-03-15 | $7700.00 | Window Closed / Lapsed |