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US4569776A
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Water-based hydraulic fluid compositions containing selected two-component anti-wear agents
Assignee: Gateway Additive Co
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Filing: 1985-03-22
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Granted: 1986-02-11
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Expires: 2005-03-22
Abstract
Abstract Disclosed is an improved water-based hydraulic fluid composition which comprises an aqueous composition having a viscosity of at least 5 centistokes at 40 DEG C. which contains up to about 95 percent by weight of water, at least 0.1 percent by weight of a carboxylic acid lubricity agent, and an effective amount of at least one selected anti-wear additive; wherein the improvement comprises: said anti-wear agent comprising the combination of: (a) an aromatic compound containing one to three electron-releasing substituent components, wherein said electron-releasing substituents are selected from the group consisting of amino, alkyl-substituted amino having 1 to about 12 carbon atoms, amido groups of the formula -NHC(=O)R wherein R is an alkyl group having 1 to about 12 carbon atoms, alkoxy having 1 to about 12 carbon atoms, and mixtures thereof; with (b) an aromatic compound containing one to three electron-withdrawing substituent components, wherein said electron-withdrawing substituents are selected from the group consisting of nitro, cyano, sulfo, and mixtures thereof.
Inventors
- 👤 Philip R. Miller
- 👤 Richard M. Mullins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:39
CPC Classifications
C; C10; C10M; C10M173/00; C10M173/02; C10M129/00; C10M129/02; C10M129/26; C10M129/28; C10M129/38; C10M129/44; C10M129/48; C10M129/54; C10M133/00; C10M133/02; C10M133/04; C10M133/12; C10M133/16; C10M133/24; C10M133/30; C10M133/32; C10M135/00; C10M135/08; C10M135/10; C10M2201/00; C10M2201/02; C10M2207/00; C10M2207/04; C10M2207/046; C10M2207/10; C10M2207/12; C10M2207/121; C10M2207/122; C10M2207/123; C10M2207/125; C10M2207/128; C10M2207/129; C10M2207/14; C10M2207/142; C10M2207/144; C10M2207/22; C10M2209/00; C10M2209/10; C10M2209/103; C10M2215/00; C10M2215/02; C10M2215/06; C10M2215/064; C10M2215/065; C10M2215/066; C10M2215/067; C10M2215/068; C10M2215/08; C10M2215/082; C10M2215/086; C10M2215/12; C10M2215/122; C10M2215/16; C10M2215/20; C10M2215/202; C10M2215/24; C10M2215/28; C10M2217/00; C10M2217/04; C10M2217/044; C10M2217/045; C10M2219/00; C10M2219/04; C10M2219/044; C10N; C10N2040/00; C10N2040/08; C10N2050/00; C10N2050/01
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
181 words
In a water-based hydraulic fluid composition which comprises an aqueous composition having a viscosity of at least 5 centistokes at 40° C. which contains up to about 95 percent by weight of water, at least 0.1 percent by weight of a carboxylic acid lubricity agent and an effective amount of an anti-wear agent, wherein the improvement comprises: said anti-wear agent comprising the combination of: (a) at least about 0.0025 gram-moles per liter of said water-based hydraulic fluid of an aromatic compound containing one to three electron-releasing substituent components, wherein said electron-releasing substituents are selected from the group consisting of amino, alkyl-substituted amino having 1 to about 12 carbon atoms, amido groups of the formula --NHC(═O)R wherein R is an alkyl group having 1 to about 12 carbon atoms, alkoxy having 1 to about 12 carbon atoms, and mixtures thereof; with (b) at least about 0.0025 gram-mole per liter of said water-based hydraulic fluid of an aromatic compound containing one to three electron-withdrawing substituent components, wherein said electron-withdrawing substituents are selected from the group consisting of nitro, cyano, sulfo, and mixtures thereof.
Claim 2
Dependent Claim
181 words
In a water-based hydraulic fluid composition which comprises an aqueous composition having a viscosity of at least 5 centistokes at 40° C. which contains up to about 95 percent by weight of water, at least 0.1 percent by weight of a carboxylic acid lubricity agent and an effective amount of an anti-wear agent, wherein the improvement comprises: said anti-wear agent comprising the combination of: (a) at least about 0.0025 gram-moles per liter of said water-based hydraulic fluid of an aromatic compound containing one to three electron-releasing substituent components, wherein said electron-releasing substituents are selected from the group consisting of amino, alkyl-substituted amino having 1 to about 12 carbon atoms, amido groups of the formula --NHC(═O)R wherein R is an alkyl group having 1 to about 12 carbon atoms, alkoxy having 1 to about 12 carbon atoms, and mixtures thereof; with (b) at least about 0.0025 gram-mole per liter of said water-based hydraulic fluid of an aromatic compound containing one to three electron-withdrawing substituent components, wherein said electron-withdrawing substituents are selected from the group consisting of nitro, cyano, sulfo, and mixtures thereof.
Claim 3
Dependent Claim
18 words
The water-based hydraulic fluid of claim 1 which contains at least about 20 percent by weight of water.
Claim 4
Dependent Claim
21 words
The water-based hydraulic fluid of claim 1 wherein component (a) of said anti-wear agent is a substituted mononuclear benzoic acid compound.
Claim 5
Dependent Claim
42 words
The water-based hydraulic fluid of claim 3 wherein said benzoic acid compound is selected from the group consisting of monoaminobenzoic acids; diaminobenzoic acids; mono-(alkoxy-substituted) benzoic acids wherein the carbon atoms in said alkoxy group contains from about 1 to 12 carbon atoms.
Claim 6
Dependent Claim
16 words
The water-based hydraulic fluid of claim 3 wherein said benzoic acid compounds are para-substituted benzoic acids.
Claim 7
Dependent Claim
28 words
The water-based hydraulic fluid of claim 5 wherein said benzoic acid compound is selected from the group consisting of p-aminobenzoic acid, 3,4-diaminobenzoic acid, p-methoxybenzoic acid and p-n-butoxybenzoic acid.
Claim 8
Dependent Claim
22 words
The water-based hydraulic fluid of claim 1 wherein component (a) of said anti-wear agent is a mononuclear para-substituted benzene sulfonic acid compound.
Claim 9
Dependent Claim
13 words
The water-based hydraulic fluid of claim 7 wherein component (a) is p-aminobenzenesulfonic acid.
Claim 10
Dependent Claim
21 words
The water-based hydraulic fluid of claim 1 wherein component (b) of said anti-wear agent is a substituted mononuclear benzoic acid compound.
Claim 11
Dependent Claim
29 words
The water-based hydraulic fluid of claim 9 wherein benzoic acid compound is selected from the group consisting of mononitrobenzoic acid, dinitrobenzoic acid, trinitrobenzoic acid, monocyanobenzoic acid and monosulfobenzoic acid.
Claim 12
Dependent Claim
17 words
The water-based hydraulic fluid of claim 10 wherein said benzoic acid compound is a parasubstituted benzoic acid.
Claim 13
Dependent Claim
24 words
The water-based hydraulic fluid of claim 11 wherein said benzoic acid compound is selected from the group consisting of p-nitrobenzoic acid and p-cyanobenzoic acid.
Claim 14
Independent Claim
148 words
A method for enhancing the anti-wear properties of water-based hydraulic fluid compositions containing an acidic lubricity agent which comprises incorporating into said hydraulic fluid said anti-wear agent comprising the combination of: (a) at least about 0.0025 gram-moles per liter of said water-based hydraulic fluid of an aromatic compound containing one to three electron-releasing substituent components, wherein said electron-releasing substituents are selected from the group consisting of amino, alkyl-substituted amino having 1 to about 12 carbon atoms, amido groups of the formula --NHC(═O)R wherein R is an alkyl group having 1 to about 12 carbon atoms, alkoxy having 1 to about 12 carbon atoms, and mixtures thereof; with (b) at least about 0.0025 gram-mole per liter of said water-based hydraulic fluid of an aromatic compound containing one to three electron-withdrawing substituent components, wherein said electron-withdrawing substituents are selected from the group consisting of nitro, cyano, sulfo, and mixtures thereof.
Claim 15
Independent Claim
148 words
A method for enhancing the anti-wear properties of water-based hydraulic fluid compositions containing an acidic lubricity agent which comprises incorporating into said hydraulic fluid said anti-wear agent comprising the combination of: (a) at least about 0.0025 gram-moles per liter of said water-based hydraulic fluid of an aromatic compound containing one to three electron-releasing substituent components, wherein said electron-releasing substituents are selected from the group consisting of amino, alkyl-substituted amino having 1 to about 12 carbon atoms, amido groups of the formula --NHC(═O)R wherein R is an alkyl group having 1 to about 12 carbon atoms, alkoxy having 1 to about 12 carbon atoms, and mixtures thereof; with (b) at least about 0.0025 gram-mole per liter of said water-based hydraulic fluid of an aromatic compound containing one to three electron-withdrawing substituent components, wherein said electron-withdrawing substituents are selected from the group consisting of nitro, cyano, sulfo, and mixtures thereof.
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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) | 1989-02-10 | 1989-08-12 | 1990-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-10 | 1993-08-12 | 1994-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-10 | 1997-08-12 | 1998-02-11 | $7700.00 | Window Closed / Lapsed |