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US4242214A
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US
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Antifreeze composition containing a corrosion inhibitor combination
Assignee: Huntsman Corp
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Filing: 1979-10-17
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Granted: 1980-12-30
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Expires: 1999-10-17
Abstract
Abstract The invention is a synergistic combination of inhibitors which effectively prevents corrosion in automotive cooling systems containing antifreeze solution based on water-soluble alcohols. The combination includes sodium tetraborate, sodium benzoate, sodium metaborate, sodium metasilicate and tolyltriazole or benzotriazole.
Inventors
- 👤 Clifford L. Lambert, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:51
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C09; C09K; C09K5/00; C09K5/20
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
75 words
A corrosion inhibited antifreeze composition consisting essentially of a water soluble liquid alcohol freezing point depressant and an inhibitor combination consisting essentially of the following components wherein the concentration ranges of the inhibitor components are weight percent of said composition: about 0.5 to 2.5 percent tetraborate ion, about 0.5 to 2.5 percent benzoate ion, about 0.05 to 1.0 percent metaborate ion, about 0.02 to 0.8 percent metasilicate ion and about 0.05 to 0.6 percent tolyltriazole.
Claim 2
Dependent Claim
75 words
A corrosion inhibited antifreeze composition consisting essentially of a water soluble liquid alcohol freezing point depressant and an inhibitor combination consisting essentially of the following components wherein the concentration ranges of the inhibitor components are weight percent of said composition: about 0.5 to 2.5 percent tetraborate ion, about 0.5 to 2.5 percent benzoate ion, about 0.05 to 1.0 percent metaborate ion, about 0.02 to 0.8 percent metasilicate ion and about 0.05 to 0.6 percent tolyltriazole.
Claim 3
Dependent Claim
17 words
An antifreeze composition as in claim 1 wherein the liquid alcohol freezing point depressant is ethylene glycol.
Claim 4
Dependent Claim
36 words
A process for inhibiting the corrosion of metals which come in contact with an antifreeze composition, which comprises contacting the surface of the metal to be inhibited against corrosion with the antifreezing composition of claim 1.
Claim 5
Dependent Claim
16 words
A process as in claim 3 wherein the liquid alcohol freezing point depressant is ethylene glycol.
Claim 6
Dependent Claim
75 words
A corrosion inhibited antifreeze composition consisting essentially of a water soluble liquid alcohol freezing point depressant and an inhibitor combination consisting essentially of the following components wherein the concentration ranges of the inhibitor components are weight percent of said composition: about 0.5 to 2.5 percent tetraborate ion, about 0.5 to 2.5 percent benzoate ion, about 0.05 to 1.0 percent metaborate ion, about 0.02 to 0.8 percent metasilicate ion and about 0.05 to 0.6 percent benzotriazole.
Claim 7
Dependent Claim
75 words
A corrosion inhibited antifreeze composition consisting essentially of a water soluble liquid alcohol freezing point depressant and an inhibitor combination consisting essentially of the following components wherein the concentration ranges of the inhibitor components are weight percent of said composition: about 0.5 to 2.5 percent tetraborate ion, about 0.5 to 2.5 percent benzoate ion, about 0.05 to 1.0 percent metaborate ion, about 0.02 to 0.8 percent metasilicate ion and about 0.05 to 0.6 percent benzotriazole.
Claim 8
Dependent Claim
17 words
An antifreeze composition as in claim 5 wherein the liquid alcohol freezing point depressant is ethylene glycol.
Claim 9
Dependent Claim
36 words
A process for inhibiting the corrosion of metals which come in contact with an antifreeze composition, which comprises contacting the surface of the metal to be inhibited against corrosion with the antifreezing composition of claim 5.
Claim 10
Dependent Claim
16 words
A process as in claim 6 wherein the liquid alcohol freezing point depressant is ethylene glycol.
Claim 11
Dependent Claim
75 words
A corrosion inhibited antifreeze composition consisting essentially of a water soluble liquid alcohol freezing point depressant and an inhibitor combination consisting essentially of the following components wherein the concentration ranges of the inhibitor components are weight percent of said composition: about 0.5 to 2.5 percent sodium tetraborate, about 0.5 to 2.5 percent sodium benzoate, about 0.05 to 1.0 percent sodium metaborate, about 0.02 to 0.8 percent sodium metasilicate and about 0.05 to 0.6 percent tolytriazole.
Claim 12
Dependent Claim
75 words
A corrosion inhibited antifreeze composition consisting essentially of a water soluble liquid alcohol freezing point depressant and an inhibitor combination consisting essentially of the following components wherein the concentration ranges of the inhibitor components are weight percent of said composition: about 0.5 to 2.5 percent sodium tetraborate, about 0.5 to 2.5 percent sodium benzoate, about 0.05 to 1.0 percent sodium metaborate, about 0.02 to 0.8 percent sodium metasilicate and about 0.05 to 0.6 percent tolytriazole.
Claim 13
Dependent Claim
75 words
A corrosion inhibited antifreeze composition consisting essentially of a water soluble liquid alcohol freezing point depressant and an inhibitor combination consisting essentially of the following components wherein the concentration ranges of the inhibitor components are weight percent of said composition: about 0.5 to 2.5 percent sodium tetraborate, about 0.5 to 2.5 percent sodium benzoate, about 0.05 to 1.0 percent sodium metaborate, about 0.02 to 0.8 percent sodium metasilicate and about 0.05 to 0.6 percent benzotriazole.
Claim 14
Dependent Claim
75 words
A corrosion inhibited antifreeze composition consisting essentially of a water soluble liquid alcohol freezing point depressant and an inhibitor combination consisting essentially of the following components wherein the concentration ranges of the inhibitor components are weight percent of said composition: about 0.5 to 2.5 percent sodium tetraborate, about 0.5 to 2.5 percent sodium benzoate, about 0.05 to 1.0 percent sodium metaborate, about 0.02 to 0.8 percent sodium metasilicate and about 0.05 to 0.6 percent benzotriazole.
References Cited (Backward Citations)
GB838258A
Cited
FR1266564A
Cited
US3228884A
Cited
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Cited
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Cited
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Cited
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Cited
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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) | 1983-12-30 | 1984-06-30 | 1984-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-30 | 1988-06-30 | 1988-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-30 | 1992-06-30 | 1992-12-30 | $7700.00 | Window Closed / Lapsed |