US5085791A
Expired / Lapsed
US
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Corrosion-inhibited antifreeze/coolant composition containing cyclohexane acid(s)
Assignee: Texaco Inc
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Filing: 1990-10-01
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Granted: 1992-02-04
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Expires: 2010-10-01
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 cyclohexane acid employed as a corrosion inhibitor. Cyclohexane carboxylic acid, cyclohexane acetic acid and cyclohexane propionic acid are preferred, with cyclohexane carboxylic acid being most preferred. Other conventional corrosion inhibitors may be employed in conjunction with the cyclohexane acid(s). In another embodiment, the present invention relates to a process for inhibiting the general pitting, crevice and deposit attack 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 substrates are aluminum and high lead solder.
Inventors
- 👤 Jeffrey M. Burns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:57
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/20; C23; C23F; C23F11/00; C23F11/08
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
40 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 at least one cyclohexane acid employed as a corrosion inhibitor.
Claim 2
Dependent Claim
40 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 at least one cyclohexane acid employed as a corrosion inhibitor.
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
50 words
The antifreeze composition of claim 1 wherein said corrosion inhibitor comprises, in addition to said cyclohexane acid, a second corrosion inhibitor 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.
Claim 5
Dependent Claim
42 words
The antifreeze composition of claim 1 wherein said corrosion inhibitor comprises, in addition to said cyclohexane acid, a second corrosion inhibitor including a C 8 to C 12 aliphatic dibasic acid or the alkali metal, ammonium or amine salt of said acid.
Claim 6
Dependent Claim
25 words
The antifreeze composition of claim 4 wherein said aliphatic dibasic acid includes suberic, azelaic, sebacic, undecanedioic, dodecanedioic, the diacid of dicyclopentadiene, terephthalic and mixtures thereof.
Claim 7
Dependent Claim
41 words
The antifreeze composition of claim 3 wherein said cyclohexane 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 8
Dependent Claim
41 words
The antifreeze composition of claim 3 wherein said cyclohexane acid is employed in an amount of about 1 to about 1.5 weight percent and said second corrosion inhibitor is employed in an amount of about 0.75 to about 1.25 weight percent.
Claim 9
Dependent Claim
41 words
The antifreeze composition of claim 4 wherein said cyclohexane 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 4 weight percent.
Claim 10
Dependent Claim
41 words
The antifreeze composition of claim 4 wherein said cyclohexane acid is employed in an amount of about 1 to about 1.5 weight percent and said second corrosion inhibitor is employed in an amount of about 0.75 to about 1.25 weight percent.
Claim 11
Dependent Claim
33 words
The antifreeze composition of claim 1 wherein said at least one cyclohexane acid is selected from the group consisting of cyclohexane carboxylic acid, cyclohexane acetic acid and cyclohexane propionic and mixture thereof acid.
Claim 12
Dependent Claim
43 words
A process for inhibiting the general pitting crevice and deposit attack 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 13
Dependent Claim
14 words
The process of claim 11 wherein said metal is high lead solder or aluminum.
Claim 14
Dependent Claim
57 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 including at least one member selected from the group consisting of cyclohexane carboxylic acid, cyclohexane acetic acid and cyclohexane propionic acid.
Claim 15
Dependent Claim
57 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 including at least one member selected from the group consisting of cyclohexane carboxylic acid, cyclohexane acetic acid and cyclohexane propionic acid.
Claim 16
Dependent Claim
31 words
The antifreeze composition of claim 13 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 17
Dependent Claim
52 words
The antifreeze composition of claim 13 wherein said corrosion inhibitor comprises, in addition to said at least one member, a second corrosion inhibitor 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.
Claim 18
Dependent Claim
44 words
The antifreeze composition of claim 13 wherein said corrosion inhibitor comprises, in addition to said at least one member, a second corrosion inhibitor including a C 8 to C 12 aliphatic dibasic acid or the alkali metal, ammonium or amine salt of said acid.
Claim 19
Dependent Claim
31 words
The antifreeze composition of claim 16 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 20
Dependent Claim
43 words
The antifreeze composition of claim 15 wherein said at least one member 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 21
Dependent Claim
43 words
The antifreeze composition of claim 15 wherein said at least one acid is employed in an amount of about 1 to about 1.5 weight percent and said second corrosion inhibitor is employed in an amount of about 0.75 to about 1.25 weight percent.
Claim 22
Dependent Claim
43 words
The antifreeze composition of claim 16 wherein said at least one member 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 23
Dependent Claim
43 words
The antifreeze composition of claim 16 wherein said at least one acid is employed in an amount of about 1 to about 1.5 weight percent and said second corrosion inhibitor is employed in an amount of about 0.75 to about 1.25 weight percent.
Claim 24
Dependent Claim
43 words
A process for inhibiting the general pitting crevice and deposit attack 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 13.
Claim 25
Dependent Claim
14 words
The process of claim 22 wherein said metal is high lead solder or aluminum.
References Cited (Backward Citations)
FR1579123A
Cited
US4105405A
Cited
US4329243A
Cited
JPS5723070A
Cited
US4587028A
Cited
US4647392A
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US4657689A
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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) | 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 |