US5085793A
Expired / Lapsed
US
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Corrosion-inhibited antifreeze/coolant composition
Assignee: Texaco Inc
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Filing: 1990-11-19
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Granted: 1992-02-04
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Expires: 2010-11-19
Abstract
Abstract A corrosion-inhibited antifreeze composition is disclosed. Specifically, the antifreeze composition comprises a major portion of a liquid alcohol freezing point depressant and a minor portion of at least one hydroxyl-substituted aromatic carboxylic acid having the hydroxyl radical disposed proximate to the carboxylic radical. The above described acid is employed as a corrosion inhibitor. Other conventional corrosion inhibitors may be employed in conjunction with the acids. In another embodiment, the present invention relates to a process for inhibitig the corrosion of metals present in the cooling system of an internal combustion engine which comprises intimately contacting the metal surface to be inhibited against corrosion with the antifreeze composition described above. Most preferably, the target substrate is high lead solder.
Inventors
- 👤 Jeffrey M. Burns
- 👤 John R. Sanderson
- 👤 John M. Larkin
- 👤 David R. McCoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:35
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/20; C23; C23F; C23F11/00; C23F11/08; C23F11/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
50 words
A corrosion-inhibited antifreeze composition consisting of from about 80 to about 99 weight percent of a liquid alcohol freezing point depressant and from about 20 to about 1 weight percent of at least one hydroxyl-substituted aromatic carboxylic acid, said acid having the hydroxyl radical disposed proximate to the carboxyl radical.
Claim 2
Dependent Claim
50 words
A corrosion-inhibited antifreeze composition consisting of from about 80 to about 99 weight percent of a liquid alcohol freezing point depressant and from about 20 to about 1 weight percent of at least one hydroxyl-substituted aromatic carboxylic acid, said acid having the hydroxyl radical disposed proximate to the carboxyl radical.
Claim 3
Dependent Claim
31 words
The antifreeze composition of claim 1 wherein said freezing point depressant is selected from the group consisting of ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol and monoethers of said glycols.
Claim 4
Dependent Claim
29 words
The antifreeze composition of claim 1 wherein said at least one hydroxyl-substituted aromatic carboxylic acid is selected from the group consisting of 2-hydroxybenzoic acid, mandelic acid and homophthalic acid.
Claim 5
Dependent Claim
37 words
A process for inhibiting the corrosion of metals present in the cooling system of an internal combustion engine which comprises intimately contacting the metal surface to be inhibited against corrosion with the antifreeze composition of claim 1.
Claim 6
Dependent Claim
12 words
The process of claim 4 wherein said metal is high lead solder.
Claim 7
Dependent Claim
51 words
A corrosion-inhibited antifreeze composition consisting of from about 80 to about 99 weight percent of a liquid alcohol freezing point depressant and from about 20 to about 1 weight percent of a corrosion inhibitor, said corrosion inhibitor being selected from the group consisting of 2-hydroxybenzoic acid, mandelic acid and homophthalic acid.
Claim 8
Dependent Claim
51 words
A corrosion-inhibited antifreeze composition consisting of from about 80 to about 99 weight percent of a liquid alcohol freezing point depressant and from about 20 to about 1 weight percent of a corrosion inhibitor, said corrosion inhibitor being selected from the group consisting of 2-hydroxybenzoic acid, mandelic acid and homophthalic acid.
Claim 9
Dependent Claim
97 words
A corrosion-inhibited antifreeze composition comprising from about 80 to about 99 weight percent of a liquid alcohol freezing point depressant and from about 20 to about 1 weight percent of a corrosion inhibitor, said corrosion inhibitor consisting of (a) at least one hydroxyl-substituted aromatic carboxylic acid, and (b) member selected from the group consisting of alkali metal borates, alkali metal silicates, alkali metal benzoates, alkali metal nitrates, alkali metal nitrites, alkali metal molybdates, hydrocarbyl thiazoles and mixtures thereof, a C 8 -C 12 aliphatic dibasic acid or the alkali metal, ammonium or amine salt of said acid.
Claim 10
Dependent Claim
97 words
A corrosion-inhibited antifreeze composition comprising from about 80 to about 99 weight percent of a liquid alcohol freezing point depressant and from about 20 to about 1 weight percent of a corrosion inhibitor, said corrosion inhibitor consisting of (a) at least one hydroxyl-substituted aromatic carboxylic acid, and (b) member selected from the group consisting of alkali metal borates, alkali metal silicates, alkali metal benzoates, alkali metal nitrates, alkali metal nitrites, alkali metal molybdates, hydrocarbyl thiazoles and mixtures thereof, a C 8 -C 12 aliphatic dibasic acid or the alkali metal, ammonium or amine salt of said acid.
Claim 11
Dependent Claim
31 words
The antifreeze composition of claim 7 wherein said aliphatic dibasic acid is selected from the group consisting of suberic, azelaic, sebacic, undecanedioic, dodecanedioic, the diacid of dicyclopentadiene, terephthalic and mixtures thereof.
Claim 12
Dependent Claim
46 words
The antifreeze composition of claim 7 wherein said at least one hydroxyl-substituted aromatic carboxylic acid is employed in an amount of about 0.1 to about 5 weight percent and said second corrosion inhibitor is employed in an amount of about 0.1 to about 5 weight percent.
Claim 13
Dependent Claim
46 words
The antifreeze composition of claim 7 wherein said at least one hydroxyl-substituted aromatic carboxylic acid is employed in an amount of about 1 to about 2 weight percent and said second corrosion inhibitor is employed in an amount of about 0.75 to about 1.25 weight percent.
Claim 14
Dependent Claim
46 words
The antifreeze composition of claim 7 wherein said at least one hydroxyl-substituted aromatic carboxylic acid is employed in an amount of about 0.1 to about 5 weight percent and said second corrosion inhibitor is employed in an amount of about 0.1 to about 5 weight percent.
Claim 15
Dependent Claim
46 words
The antifreeze composition of claim 7 wherein said at least one hydroxyl-substituted aromatic carboxylic acid is employed in an amount of about 1 to about 2 weight percent and said second corrosion inhibitor is employed in an amount of about 0.75 to about 1.25 weight percent.
Claim 16
Dependent Claim
37 words
A process for inhibiting the corrosion of metals present in the cooling system of an internal combustion engine which comprises intimately contacting the metal surface to be inhibited against corrosion with the antifreeze composition of claim 6.
Claim 17
Dependent Claim
12 words
The process of claim 13 wherein said metal is high lead solder.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1995-02-03 | 1995-08-05 | 1996-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-03 | 1999-08-05 | 2000-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-03 | 2003-08-05 | 2004-02-04 | $7700.00 | Window Closed / Lapsed |