US4439612A
Expired / Lapsed
US
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Preparation for use as lube oil additives of thioureas containing N-polyalkyleneamino hydrocarbyl succinimido groups
Assignee: Afton Chemical Additives Corp
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Filing: 1980-09-22
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Granted: 1984-03-27
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Expires: 2000-09-22
Abstract
Abstract Disclosed are the preparation and use of thioureas derived from hydrocarbyl succinimides which have the formula: ##STR1## wherein R is a hydrocarbyl succinimide residue or hydrogen, with the proviso that only one R can be hydrogen. These thioureas offer superior performance over their parent succinimides in the areas of gasoline and diesel engine dispersancy, oxidation stability and friction modification.
Inventors
- 👤 Gary T. Babic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:14
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/30; C07D207/34; C07D207/36; C07D207/40; C07D207/404; C07D207/408; C07D207/412; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/24; C10L1/2425; C10M; C10M135/00; C10M135/12; C10M135/14; C10M135/16; C10M2219/00; C10M2219/10; C10M2219/102; C10M2219/104; C10M2219/106; F; F02; F02B; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
106 words
A compound of the formula: ##STR6## wherein R is the succinimide residue ##STR7## in which R' is an alkyl or alkenyl residue having more than 8 carbon atoms; and n is an integer from 2 to 8, prepared by heating to 80° to 130° C. a reaction mixture of an alkyl or alkenylsuccinic anhydride and a polyalkylene amine terminated by two primary amino groups using half of the equimolecular amount of amine per equivalent of anhydride to form a succinimide; removing water; cooling said reaction mixture; adding thiourea; heating said mixture; purging ammonia formed with an inert gas and isolating a product having the above formula.
Claim 2
Dependent Claim
106 words
A compound of the formula: ##STR6## wherein R is the succinimide residue ##STR7## in which R' is an alkyl or alkenyl residue having more than 8 carbon atoms; and n is an integer from 2 to 8, prepared by heating to 80° to 130° C. a reaction mixture of an alkyl or alkenylsuccinic anhydride and a polyalkylene amine terminated by two primary amino groups using half of the equimolecular amount of amine per equivalent of anhydride to form a succinimide; removing water; cooling said reaction mixture; adding thiourea; heating said mixture; purging ammonia formed with an inert gas and isolating a product having the above formula.
Claim 3
Dependent Claim
12 words
The compound of claim 1, wherein R is an n-tetradecenyl succinimide residue.
Claim 4
Dependent Claim
12 words
The compound of claim 1, wherein R is an octyl succinimide residue.
References Cited (Backward Citations)
US3200107A
Cited
US3256185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-27 | 1987-09-26 | 1988-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-27 | 1991-09-26 | 1992-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-27 | 1995-09-26 | 1996-03-27 | $7700.00 | Window Closed / Lapsed |