Patent US3673226A successfully refreshed from Google Patents.
US3673226A
Expired / Lapsed
US
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Synthetic lubricants
Assignee: Ethyl Corp
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Filing: 1968-04-10
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Granted: 1972-06-27
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Expires: 1988-04-10
Abstract
Abstract Elimination of water from trimethylolpropane forms a mixture containing a substantial amount of di-trimethylolpropane. Esterification of the mixture with monobasic aliphatic carboxylic acids containing from about 2-12 carbon atoms such that the average acid chain is from 4-9 carbon atoms results in a synthetic ester lubricant especially useful for lubricating gas turbines.
Inventors
- 👤 Robert E Malec
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:41
CPC Classifications
C; C10; C10M; C10M3/00; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/024; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/109; C10M2211/00; C10M2211/04; C10M2211/042; C10M2211/06; C10M2215/00; C10M2215/02; C10M2215/06; C10M2215/064; C10M2215/065; C10M2219/00; C10M2219/08; C10M2219/082; C10M2219/087; C10M2219/088; C10M2219/089; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/041; C10N; C10N2030/00; C10N2030/08; C10N2040/00; C10N2040/12; C10N2040/13
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
33 words
The lubricant of Claim 1 wherein said trimethylolpropane is maintained at said etherification temperature until about 0.45 to 0.55 mole parts of water have been eliminated for each mole part of said trimethylolpropane.
Claim 2
Dependent Claim
26 words
The lubricant made by the process of claim 2 wherein the etherification steps (A) and (B) are conducted in the presence of a water azeotroping solvent.
Claim 3
Dependent Claim
21 words
The lubricant made by the process of claim 3 wherein said monobasic saturated aliphatic carboxylic acid consists essentially of n-octanoic acid.
Claim 4
Dependent Claim
47 words
The lubricant made by the process of claim 3 wherein said monobasic saturated aliphatic carboxylic acid is a mixture consisting essentially of from about 15-20 weight per cent n-hexanoic acid, from about 35-40 weight per cent n-octanoic acid, and from about 40-50 weight per cent n-decanoic acid.
Claim 5
Dependent Claim
141 words
A process of preparing a synthetic ester lubricant, said process comprising: A. heating trimethylolpropane to an etherification temperature in the presence of an acid catalyst causing the elimination of water and the formation of poly-trimethylolpropane, B. maintaining said trimethylolpropane at said etherification temperature until from about 0.25 to 0.75 mole parts of water have been eliminated for each mole part of said tri-methylolpropane, C. adding sufficient monobasic saturated aliphatic carboxylic acid to the resultant poly-trimethylolpropane to esterify substantially all of the hydroxyl groups present, said monobasic saturated aliphatic carboxylic acid containing from about 2-12 carbon atoms in proportion such that the average acid group contains from about 4-9 carbon atoms, and D. heating the mixture of said monobasic saturated aliphatic carboxylic acid and poly-trimethylolpropane to an esterification temperature and maintaining said mixture at said esterification temperature until esterification is substantially complete.
Claim 6
Dependent Claim
31 words
The process of claim 6 wherein said trimethylolpropane is maintained at said etherification temperature until about 0.45-0.55 mole parts of water have been eliminated for each mole part of said trimethylolpropane.
Claim 7
Dependent Claim
22 words
The process of claim 7 wherein said etherification steps (A) and (B) are conducted in the presence of a water azeotroping solvent.
Claim 8
Dependent Claim
43 words
The process of claim 8 wherein said monobasic saturated aliphatic carboxylic acid is a mixture consisting essentially of from about 15-20 weight per cent n-hexanoic acid, from about 35-40 weight per cent n-octanoic acid and from about 40-50 weight per cent n-decanoic acid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |