Patent US4647392A successfully refreshed from Google Patents.
US4647392A
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Monobasic-dibasic acid/salt antifreeze corrosion inhibitor
Assignee: Chevron Belgium NV
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Filing: 1985-12-27
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Granted: 1987-03-03
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Expires: 2005-12-27
Abstract
Abstract A corrosion inhibitor for use in water and liquid alcohol antifreeze/coolant compositions comprising the combination of a C 5 -C 16 aliphatic monobasic acid or the alkali metal, ammonium, or amine salt of said acid, a C 5 -C 16 hydrocarbyl dibasic acid or the alkali metal, ammonium, or amine salt of said acid, and a hydrocarbyl triazole gives synergistic corrosion protection to metal surfaces as compared with formulations containing either the monoacid or diacid component alone, or formulations containing other conventional corrosion inhibitors.
Inventors
- 👤 Jerome W. Darden
- 👤 Carol A. Triebel
- 👤 Walter A. Van Neste
- 👤 Jean P. Maes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:29
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C09; C09K; C09K5/00; C09K5/20; C23F11/10
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
69 words
A corrosion inhibitor for use in aqueous systems comprising: (a) from 0.1-15.0 weight percent of a C 5 -C 16 aliphatic monobasic acid or the alkali metal, ammonium, or amine salt of said acid; (b) from 0.1-15.0 weight percent of a C 5 -C 16 hydrocarbyl dibasic acid or the alkali metal, ammonium, or amine salt of said acid; and (c) from 0.1-0.5 weight percent of a hydrocarbonyl triazole.
Claim 2
Dependent Claim
69 words
A corrosion inhibitor for use in aqueous systems comprising: (a) from 0.1-15.0 weight percent of a C 5 -C 16 aliphatic monobasic acid or the alkali metal, ammonium, or amine salt of said acid; (b) from 0.1-15.0 weight percent of a C 5 -C 16 hydrocarbyl dibasic acid or the alkali metal, ammonium, or amine salt of said acid; and (c) from 0.1-0.5 weight percent of a hydrocarbonyl triazole.
Claim 3
Dependent Claim
46 words
The corrosion inhibitor of claim 1, where said C 5 -C 16 aliphatic monobasic acid or salt is a C 8 -C 12 aliphatic monobasic acid or the alkali metal, ammmonium, or amine salt of said acid, present in a concentration range of 0.1-2.5 weight percent.
Claim 4
Dependent Claim
37 words
The corrosion inhibitor of claim 2, wherein said C 8 -C 12 aliphatic monobasic acid is selected from the group consisting of octanoic acid, nonanoic acid, decanoic acid, undecanoic acid, dodecanoic acid, 2-ethylhexanoic acid, and neodecanoic acid.
Claim 5
Dependent Claim
46 words
The corrosion inhibitor of claim 1, where said C 5 -C 16 hydrocarbyl dibasic acid or salt is a C 8 -C 12 aliphatic dibasic acid or the alkali metal, ammonium, or amine salt of said acid, present in the concentration range of 0.01-2.5 weight percent.
Claim 6
Dependent Claim
37 words
The corrosion inhibitor of claim 4, where said C 8 -C 12 aliphatic dibasic acid is selected from the group consisting of: suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, and the diacid of dicyclopentadiene.
Claim 7
Dependent Claim
46 words
The corrosion inhibitor of claim 1, where said C 5 -C 16 hydrocarbyl dibasic acid or salt is a C 8 -C 12 aromatic dibasic acid or the alkali metal, ammonium, or amine salt of said acid, present in a concentration range of 0.1-2.5 weight percent.
Claim 8
Dependent Claim
18 words
The corrosion inhibitor of claim 6, where said C 8 -C 12 aromatic dibasic acid is terephthalic acid.
Claim 9
Dependent Claim
23 words
The corrosion inhibitor of claim 1, where said hydrocarbyl triazole is tolyltriazole or benzotriazole, present in a concentration range of 0.1-0.3 weight percent.
Claim 10
Dependent Claim
52 words
The corrosion inhibitor of claim 1, in which an additional corrosion inhibitor is also employed at concentrations of 0.01 to 5.0 weight percent, and is selected from the group consisting of alkali metal borates, alkali metal silicates alkali metal benzoates, alkali metal nitrates, alkali metal nitrites, alkali metal molybdates, and hydrocarbyl thiazoles.
Claim 11
Dependent Claim
16 words
The corrosion inhibitor of claim 9, where said additional corrosion inhibitor employed is sodium metasilicate pentahydrate.
Claim 12
Dependent Claim
21 words
A corrosion-inhibited aqueous composition comprising a major amount of water and a minor amount of the corrosion inhibitor of claim 1.
Claim 13
Dependent Claim
31 words
The corrosion inhibited aqueous composition of claim 11, where an alkali metal hydroxide is added to adjust the pH of said corrosion inhibited aqueous composition to a range of about 6.5-9.5.
Claim 14
Dependent Claim
16 words
The corrosion inhibited aqueous composition of claim 12, where said alkali metal hydroxide is sodium hydroxide.
Claim 15
Dependent Claim
93 words
A corrosion-inhibited antifreeze composition for use in the cooling system of a water-cooled internal combustion engine comprising a water-soluble liquid alcohol freezing point depressant and an effective amount of a corrosion inhibitor comprising: (a) from 0.1-15.0 weight percent of a C 5 -C 16 aliphatic monobasic acid or the alkali metal, ammonium, or amine salt of said acid; (b) from 0.1-15.0 weight percent of a C 5 -C 16 hydrocarbyl dibasic acid or the alkali metal, ammonium, or amine salt of said acid; and (c) from 0.1-0.5 weight percent of a hydrocarbyl triazole.
Claim 16
Dependent Claim
93 words
A corrosion-inhibited antifreeze composition for use in the cooling system of a water-cooled internal combustion engine comprising a water-soluble liquid alcohol freezing point depressant and an effective amount of a corrosion inhibitor comprising: (a) from 0.1-15.0 weight percent of a C 5 -C 16 aliphatic monobasic acid or the alkali metal, ammonium, or amine salt of said acid; (b) from 0.1-15.0 weight percent of a C 5 -C 16 hydrocarbyl dibasic acid or the alkali metal, ammonium, or amine salt of said acid; and (c) from 0.1-0.5 weight percent of a hydrocarbyl triazole.
Claim 17
Dependent Claim
48 words
The corrosion inhibited antifreeze composition of claim 14, where said C 5 -C 16 aliphatic monobasic acid or salt is a C 8 -C 12 aliphatic monobasic acid or the alkali metal, ammonium, or amine salt of said acid, present in a concentration range of 0.1-2.5 weight percent.
Claim 18
Dependent Claim
39 words
The corrosion inhibited antifreeze composition of claim 15, where said C 8 -C 12 aliphatic monobasic acid is selected from the group consisting of octanoic acid, nonanoic acid, decanoic acid, undecanoic acid, dodecanoic acid, 2-ethylhexanoic acid, and neodecanoic acid.
Claim 19
Dependent Claim
48 words
The corrosion inhibited antifreeze composition of claim 14 where said C 5 -C 16 hydrocarbyl dibasic acid or salt is a C 8 -C 12 aliphatic dibasic acid or the alkali metal, ammonium, or amine salt of said acid, present in a concentration range of 0.1-2.5 weight percent.
Claim 20
Dependent Claim
39 words
The corrosion inhibited antifreeze composition of claim 17, where said C 8 -C 12 aliphatic dibasic acid is selected from the group consisting of: suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, and the diacid of dicyclopentadiene.
Claim 21
Dependent Claim
48 words
The corrosion inhibited antifreeze composition of claim 14, where said C 5 -C 16 hydrocarbyl dibasic acid or salt is a C 8 -C 12 aromatic dibasic acid or the alkali metal, ammonium, or amine salt of said acid, present in a concentration range of 0.1-2.5 weight percent.
Claim 22
Dependent Claim
20 words
The corrosion inhibited antifreeze composition of claim 19, where said C 8 -C 12 aromatic dibasic acid is terephthalic acid.
Claim 23
Dependent Claim
25 words
The corrosion inhibited antifreeze composition of claim 14, where said hydrocarbyl triazole is tolyltriazole or benzotriazole, present in a concentration range of 0.1-0.3 weight percent.
Claim 24
Dependent Claim
27 words
The corrosion inhibited composition of claim 14, where an alkali metal hydroxide is added to adjust the pH of said composition to a range of about 6.5-9.5.
Claim 25
Dependent Claim
16 words
The corrosion inhibited antifreeze composition of claim 22, where said alkali metal hydroxide is sodium hydroxide.
Claim 26
Dependent Claim
50 words
The corrosion inhibited antifreeze composition of claim 14, in which an additional corrosion inhibitor is employed at concentrations of 0.01 to 5.0 weight percent, and is selected from the group consisting of: alkali metal silicates, alkali metal benzoates, alkali metal nitrates, alkali metal nitrites, alkali metal molybdates, and hydrocarbyl thiazoles.
Claim 27
Dependent Claim
18 words
The corrosion inhibited antifreeze composition of claim 24, where said additional corrosion inhibitor employed is sodium metasilicate pentahydrate.
Claim 28
Dependent Claim
19 words
The corrosion inhibited antifreeze composition of claim 14, in which said liquid alcohol freezing point depressent is ethylene glycol.
Claim 29
Dependent Claim
23 words
The corrosion inhibited antifreeze composition of claim 14, in which said antifreeze composition is diluted with water in concentrations of 10-90 weight percent.
Claim 30
Dependent Claim
45 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 an aqueous composition containing a minor amount of the corrosion inhibitor of claim 1.
Claim 31
Dependent Claim
39 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 corrosion inhibited antifreeze composition of claim 14.
Claim 32
Dependent Claim
40 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 corrosion inhibited aqueous antifreeze composition of claim 27.
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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) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |