US4248725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispersants having antioxidant activity and lubricating compositions containing them
Assignee: Chevron USA Inc
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Filing: 1979-03-19
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Granted: 1981-02-03
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Expires: 1999-03-19
Abstract
Abstract Lubricating oil additives having both dispersant and antioxidant activity, particularly useful for incorporation in two-stroke petrol engine lubricating oil compositions, are produced when a dispersant having free >N-H groups, e.g. a substituted succinimide is reacted with an aldehyde and a compound having antioxidant activity containing in its molecular structure a group or groups capable of condensing with the aldehyde and >N-H groups present in the dispersant, thereby chemically bonding the compound to the dispersant. Representative antioxidants are mononuclear and polynuclear substituted phenols having at least one unsubstituted ortho- or para-position, e.g. 2,6-di-tert-butyl phenol and secondary aromatic amines. Typical reaction conditions are a temperature in the range 100° to 175° C. and atmospheric pressure.
Inventors
- 👤 John Crawford
- 👤 Geoffrey A. Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:27
CPC Classifications
C; C10; C10M; C10M159/00; C10M159/12; C08; C08F; C08F8/00; C10M133/00; C10M133/52; C10M133/56; C10M141/00; C10M141/06; C10M159/16; C10M2203/00; C10M2203/10; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/026; C10M2207/027; C10M2207/08; C10M2207/10; C10M2207/12; C10M2207/125; C10M2207/129; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/06; C10M2215/064; C10M2215/065; C10M2215/066; C10M2215/24; C10M2215/26; C10M2215/28; C10M2217/00; C10M2217/02; C10M2217/04; C10M2217/043; C10M2217/046; C10M2217/06; C10M2219/00; C10M2219/02; C10M2219/022; C10M2219/04; C10M2219/044; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/045; C10N; C10N2010/00; C10N2010/04; C10N2010/14; C10N2030/00; C10N2030/04; C10N2030/10; C10N2040/00; C10N2040/25; C10N2040/252; C10N2040/255; C10N2040/26; C10N2070/00; F; F02; F02B; F02B1/00; F02B1/02; F02B1/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
110 words
A lubricating oil additive providing for the release of anti-oxidants in lubricating oil compositions comprising the product obtained by reacting a substituted succinimide dispersant having free >NH groups in its molecular structure, an aldehyde and an anti-oxidant compound capable of condensing with an aldehyde and said dispersant, selected from secondary aromatic amines, wherein an aldehyde and said anti-oxidant compound are reacted in about equimolar amounts with said dispersant at a temperature in the range of about 100°-175° C. to chemically bond said anti-oxidant compound to said dispersant in a manner permitting the release of said anti-oxidant by scission of the chemical bond binding it to said dispersant at elevated temperatures.
Claim 2
Dependent Claim
110 words
A lubricating oil additive providing for the release of anti-oxidants in lubricating oil compositions comprising the product obtained by reacting a substituted succinimide dispersant having free >NH groups in its molecular structure, an aldehyde and an anti-oxidant compound capable of condensing with an aldehyde and said dispersant, selected from secondary aromatic amines, wherein an aldehyde and said anti-oxidant compound are reacted in about equimolar amounts with said dispersant at a temperature in the range of about 100°-175° C. to chemically bond said anti-oxidant compound to said dispersant in a manner permitting the release of said anti-oxidant by scission of the chemical bond binding it to said dispersant at elevated temperatures.
Claim 3
Dependent Claim
113 words
A lubricating oil additive according to claim 1 wherein said dispersant in the product obtained by reacting a substituted succinic acid having the structural formula: ##STR6## or a substituted succinic anhydride having the structural formula: ##STR7## in which structural formulae (I) and (II) the substituent R is a large substantially aliphatic hydrocarbon radical having from 30 to 200 carbon atoms, with at least one-half an equivalent amount of an amine of formula: ##STR8## in which formula (III) the substituent R 1 is selected from C 1 to C 6 alkyl radicals and hydrogen, at a sufficiently elevated temperature to effect formation of said product and to remove the water formed in the reaction.
Claim 4
Dependent Claim
28 words
A lubricating oil additive according to claim 2 wherein said substituent R in the formulae (I) and (II) is a polyisobutylene group having at least 50 carbon atoms.
Claim 5
Dependent Claim
26 words
A lubricating oil additive according to claim 2 wherein said amine of formula (III) is selected from ethylene diamine, diethylene triamine, triethylene tetramine and pentaethylene hexamine.
Claim 6
Dependent Claim
56 words
A lubricating oil additive according to claim 1 wherein said dispersant is the product obtained by reacting at a temperature in the range 100° to 160° C. one mole of a substituted succinic anhydride wherein said substituent is derived from a polyisobutene of molecular weight about 1000 with either one or two moles of triethylene tetramine.
Claim 7
Dependent Claim
22 words
A lubricating oil additive according to claim 1 wherein said secondary aromatic amine is selected from N-phenyl-β-N-naphthylamine, N,N 1 -di-(naphthyl-2)-para-phenylenediamine and N-phenyl-α-naphthylamine.
Claim 8
Dependent Claim
13 words
A lubricating oil additive according to claim 1 wherin said aldehyde is formaldehyde.
Claim 9
Dependent Claim
28 words
A lubricating oil composition comprising a major proportion of a base oil of lubricating viscosity and from 0.1 to 20 percent lubricating oil additive according to claim 1.
Claim 10
Dependent Claim
31 words
A lubricating oil composition according to claim 8 wherein said lubricating oil additive is present in an amount in the range of from 0.1 to 20% by weight of said composition.
Claim 11
Dependent Claim
21 words
A lubricating oil composition according to claim 8 wherein said base oil is an SAE 30 or SAE 40 grade oil.
References Cited (Backward Citations)
US3036003A
Cited
US3455832A
Cited
US3368972A
Cited
US3798165A
Cited
US3442808A
Cited
US3454496A
Cited
US3493520A
Cited
US3634248A
Cited
US4066559A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-03 | 1984-08-04 | 1985-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-03 | 1988-08-04 | 1989-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-03 | 1992-08-04 | 1993-02-03 | $7700.00 | Window Closed / Lapsed |