US4990278A
Expired / Lapsed
US
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Corrosion inhibited deicing composition and method of its use
Assignee: Vertellus Specialties Inc
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Filing: 1990-01-26
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Granted: 1991-02-05
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Expires: 2010-01-26
Abstract
Abstract A low-temperature corrosion inhibited deicing composition is disclosed which comprises a major portion of magnesium chloride and an effective amount of an inhibitor including a polyphosphate salt to reduce corrosion, or a solution thereof. The solution form is preferred. Additional preferred aspects are provided where the inhibitor also includes a zinc-containing salt, and where the deicing composition is free from (or at least substantially so) chloride ions other than those due to the magnesium chloride. A method for low-temperature deicing of bridgework is described which includes the use of the inhibited deicing composition.
Inventors
- 👤 John T. Wyeth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:48
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/18; C23F11/182; C09; C09K; C09K3/00; C09K3/18; C09K3/185
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
59 words
A corrosion inhibited low-temperature deicing composition consisting essentially of a major portion by weight of magnesium chloride and an effective amount of an inhibitor including a polyphosphate salt to reduce corrosion of ferrous metals, wherein said composition is free from any significant amount of chloride ion other than that present from the magnesium chloride, or an aqueous solution thereof.
Claim 2
Dependent Claim
59 words
A corrosion inhibited low-temperature deicing composition consisting essentially of a major portion by weight of magnesium chloride and an effective amount of an inhibitor including a polyphosphate salt to reduce corrosion of ferrous metals, wherein said composition is free from any significant amount of chloride ion other than that present from the magnesium chloride, or an aqueous solution thereof.
Claim 3
Dependent Claim
15 words
The composition of claim 1 which consists essentially of said magnesium chloride and polyphosphate salt.
Claim 4
Dependent Claim
19 words
The composition of claim 1 which consists essentially of an aqueous solution of said magnesium chloride and polyphosphate salt.
Claim 5
Dependent Claim
35 words
The composition of claim 3 wherein said magnesium chloride comprises about 1% to about 50% by weight of said solution and said polyphosphate salt constitutes about 0.001 to about 20% by weight of said solution.
Claim 6
Dependent Claim
12 words
The composition of claim 4 wherein said polyphosphate salt comprises a metaphosphate.
Claim 7
Dependent Claim
12 words
The composition of claim 5 wherein said polyphosphate salt is sodium metaphosphate.
Claim 8
Dependent Claim
13 words
The composition of claim 1 wherein said inhibitor additionally comprises a zinc-containing salt.
Claim 9
Dependent Claim
15 words
The composition of claim 7 wherein said zinc-containing salt is substantially free from chloride ion.
Claim 10
Dependent Claim
15 words
The composition of claim 8 wherein said magnesium chloride is from a magnesium chloride brine.
Claim 11
Dependent Claim
17 words
The composition of claim 9 which consists essentially of said magnesium chloride, polyphosphate salt and zinc-containing salt.
Claim 12
Dependent Claim
21 words
The composition of claim 9 which consists essentially of an aqueous solution of said magnesium chloride, polyphosphate salt and zinc-containing salt.
Claim 13
Dependent Claim
40 words
The composition of claim 11 wherein said magnesium chloride constitutes about 1% to about 50% by weight of said solution and said polyphosphate salt and zinc-containing salt taken together constitute about 0.001% to about 20% by weight of said solution.
Claim 14
Dependent Claim
17 words
The composition of claim 12 wherein said magnesium chloride constitutes about 25% by weight of said solution.
Claim 15
Dependent Claim
25 words
The composition of claim 13 wherein said magnesium chloride constitutes at least about 90-95% by weight of the composition disregarding the weight of the solvent.
Claim 16
Dependent Claim
13 words
The composition of claim 14 wherein said polyphosphate salt is a metaphosphate salt.
Claim 17
Dependent Claim
12 words
The composition of claim 15 wherein said metaphosphate salt is sodium metaphosphate.
Claim 18
Dependent Claim
12 words
The composition of claim 16 wherein said zinc-containing salt is zinc sulfate.
Claim 19
Independent Claim
82 words
A method for low-temperature deicing of a roadway bridge which comprises the step of applying a corrosion inhibited deicing composition consisting essentially of a major portion by weight of magnesium chloride and an effective amount of an inhibitor including a polyphosphate salt to reduce corrosion of ferrous metals, wherein said composition is free from any significant amount of chloride ion other than that present from the magnesium chloride, or an aqueous solution thereof, to a snow or ice-covered surface of the bridge.
Claim 20
Independent Claim
82 words
A method for low-temperature deicing of a roadway bridge which comprises the step of applying a corrosion inhibited deicing composition consisting essentially of a major portion by weight of magnesium chloride and an effective amount of an inhibitor including a polyphosphate salt to reduce corrosion of ferrous metals, wherein said composition is free from any significant amount of chloride ion other than that present from the magnesium chloride, or an aqueous solution thereof, to a snow or ice-covered surface of the bridge.
Claim 21
Dependent Claim
22 words
The method of claim 18 in which in said applying step, the composition consists essentially of said magnesium chloride and polyphosphate salt.
Claim 22
Dependent Claim
57 words
The method of claim 18 in which in said applying step, the composition consists essentially of an aqueous solution of the magnesium chloride and polyphosphate salt and wherein the magnesium chloride constitutes about 1% to about 50% by weight of the solution and the polyphosphate salt constitutes about 0.001% to about 20% by weight of the solution.
Claim 23
Dependent Claim
18 words
The method of claim 18 in which in said applying step, the inhibitor additionally comprises a zinc-containing salt.
Claim 24
Dependent Claim
20 words
The method of claim 21 in which in said apply step, the zinc-containing salt is substantially free from chloride ion.
Claim 25
Dependent Claim
21 words
The method of claim 22 in which in said applying step, the and, magnesium chloride is from a magnesium chloride brine.
Claim 26
Dependent Claim
23 words
The method of claim 23 which in said applying step, the composition consists essentially of the magnesium chloride, polyphosphate salt and zinc-containing salt.
Claim 27
Dependent Claim
28 words
The method of claim 23 in which in said applying step, the composition consists essentially of an aqueous solution of the magnesium chloride, polyphosphate salt and zinc-containing salt.
Claim 28
Dependent Claim
44 words
The method of claim 25 in which in said applying step, the magnesium chloride constitutes about 1% about 50% by weight of the solution, and the polyphosphate salt and zinc-containing salt taken together constitute about 0.001% to about 20% by weight of the solution.
Claim 29
Dependent Claim
18 words
The method of claim 26 in which in said applying step, the polyphosphate salt is a metaphosphate salt.
Claim 30
Dependent Claim
22 words
The method of claim 27 in which in said applying step, the magnesium chloride constitutes about 25% by weight of the solution.
Claim 31
Dependent Claim
17 words
The method of claim 28 in which in said applying step, the metaphosphate salt is sodium metaphosphate.
Claim 32
Dependent Claim
17 words
The method of claim 29 in which in said applying step, the zinc-containing salt is zinc sulfate.
References Cited (Backward Citations)
US4803007A
Cited
JPH03225686A
Cited
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) | 1994-02-04 | 1994-08-06 | 1995-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-04 | 1998-08-06 | 1999-02-05 | $3760.00 | Window Closed / Lapsed |
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