US5118434A
Expired / Lapsed
US
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Deicing fluids
Assignee: Dow Chemical Co
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Filing: 1991-02-26
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Granted: 1992-06-02
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Expires: 2011-02-26
Abstract
Abstract Precipitation of salts from glycol-based fluids when mixed with water is prevented by the addition of copolymers or terpolymers of acrylic acid or alkali metal salt thereof and one or more of the monomers selected from the group consisting of 2-acrylamido-2-methylpropyl sulfonic acid or metal salt thereof, 4-styrenesulfonic acid or metal salt thereof, a lower alkyl hydroxy acrylate, and mixtures thereof.
Inventors
- 👤 Gene R. Meyer
- 👤 Donald C. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:40
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/18
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
132 words
A glycol-based composition comprising: (A) 50 to 99 percent by weight of one or more glycols selected from the group consisting of alkylene glycols, alkylene glycol monoethers, and alkylene glycol diethers; (B) 0.001 to 15 percent by weight of one or more corrosion inhibitors: (C) 25 to 2500 parts of a polymeric additive per million parts by weight of the one or more glycols, the polymeric additive being essentially free of cross-linking and being a copolymer or a terpolymer of acrylic acid or alkali metal salt thereof and one or more of the monomers selected from the group consisting of 2-acrylamido-2-methylpropyl sulfonic, acid or alkali metal salt thereof, 4-styrenesulfonic acid or alkali metal salt thereof, a lower alkyl hydroxy acrylate, and mixtures thereof: and (D) up to 50 percent by weight water.
Claim 2
Dependent Claim
132 words
A glycol-based composition comprising: (A) 50 to 99 percent by weight of one or more glycols selected from the group consisting of alkylene glycols, alkylene glycol monoethers, and alkylene glycol diethers; (B) 0.001 to 15 percent by weight of one or more corrosion inhibitors: (C) 25 to 2500 parts of a polymeric additive per million parts by weight of the one or more glycols, the polymeric additive being essentially free of cross-linking and being a copolymer or a terpolymer of acrylic acid or alkali metal salt thereof and one or more of the monomers selected from the group consisting of 2-acrylamido-2-methylpropyl sulfonic, acid or alkali metal salt thereof, 4-styrenesulfonic acid or alkali metal salt thereof, a lower alkyl hydroxy acrylate, and mixtures thereof: and (D) up to 50 percent by weight water.
Claim 3
Dependent Claim
17 words
The composition of claim 1 wherein the composition has a pH of between about 8.0 and 10.
Claim 4
Dependent Claim
28 words
The composition of claim 1 wherein the polymeric additive is a copolymer of acrylic acid or alkali metal salt thereof and 2-acrylamido-2-methylpropyl sulfonic acid or metal salt thereof.
Claim 5
Dependent Claim
34 words
The composition of claim 3 wherein the copolymer has a weight ratio of acrylic acid or alkali metal salt thereof to 2-acrylamido-2-methylpropyl sulfonic acid or alkali metal salt thereof of between 25:75 and 95:5.
Claim 6
Dependent Claim
21 words
The composition of claim 1 wherein the polymeric additive is a copolymer of acrylic acid and a lower alkyl hydroxy acrylate.
Claim 7
Dependent Claim
13 words
The composition of claim 5 wherein the lower alkyl hydroxy acrylate is 2-hydroxy-propylacrylate.
Claim 8
Dependent Claim
36 words
The composition of claim 1 wherein the polymeric additive is a terpolymer of acrylic acid or alkali metal salt thereof, 2-acrylamido-2-methylpropyl sulfonic acid or alkali metal salt thereof, and 4-styrenesulfonic acid or alkali metal salt thereof.
Claim 9
Dependent Claim
30 words
The composition of claim 1 wherein the composition comprises between about 325 to 1500 parts of the polymeric additive per million parts by weight of the one or more glycols.
Claim 10
Independent Claim
160 words
A method for preparing a glycol-based composition which comprises admixing a glycol-based composition with water to form a mixture containing between about 15 and 85 percent by weight water, the glycol-based composition comprising: (A) 50 to 99 percent by weight of one or more glycols selected from the group consisting of alkylene glycols, alkylene glycol monoethers, and alkylene glycol diethers; (B) 0.001 to 15 percent by weight of one or more corrosion inhibitors; (C) 25 to 2500 parts of a polymeric additive per million parts by weight of the one or more glycols, the polymeric additive being essentially free of cross-linking and being a copolymer or a terpolymer of acrylic acid or alkali metal salt thereof and one or more of the monomers selected from the group consisting of 2-acrylamido-2-methylpropyl sulfonic acid or metal salt thereof, 4-styrenesulfonic acid or metal salt thereof, a lower alkyl hydroxy acrylate, and mixtures thereof; and (D) up to 50 percent by weight of water.
Claim 11
Independent Claim
160 words
A method for preparing a glycol-based composition which comprises admixing a glycol-based composition with water to form a mixture containing between about 15 and 85 percent by weight water, the glycol-based composition comprising: (A) 50 to 99 percent by weight of one or more glycols selected from the group consisting of alkylene glycols, alkylene glycol monoethers, and alkylene glycol diethers; (B) 0.001 to 15 percent by weight of one or more corrosion inhibitors; (C) 25 to 2500 parts of a polymeric additive per million parts by weight of the one or more glycols, the polymeric additive being essentially free of cross-linking and being a copolymer or a terpolymer of acrylic acid or alkali metal salt thereof and one or more of the monomers selected from the group consisting of 2-acrylamido-2-methylpropyl sulfonic acid or metal salt thereof, 4-styrenesulfonic acid or metal salt thereof, a lower alkyl hydroxy acrylate, and mixtures thereof; and (D) up to 50 percent by weight of water.
Claim 12
Dependent Claim
18 words
The method of claim 9 wherein the glycol-based composition has a pH of between about 8.0 and 10.
Claim 13
Dependent Claim
28 words
The method of claim 9 wherein the polymeric additive is a copolymer of acrylic acid or alkali metal salt thereof and 2-acrylamido-2-methylpropyl sulfonic acid or metal salt thereof.
Claim 14
Dependent Claim
34 words
The composition of claim 11 wherein the copolymer has a weight ratio of acrylic acid or alkali metal salt thereof and 2-acrylamido-2-methylpropyl sulfonic acid or alkali metal salt thereof of between 25:75 and 95:5.
Claim 15
Dependent Claim
21 words
The method of claim 9 wherein the polymeric additive is a copolymer of acrylic acid and a lower alkyl hydroxy acrylate.
Claim 16
Dependent Claim
13 words
The method of claim 13 wherein the lower alkyl hydroxy acrylate is 2-hydroxy-propyl-acrylate.
Claim 17
Dependent Claim
36 words
The method of claim 9 wherein the polymeric additive is a terpolymer of acrylic acid or alkali metal salt thereof, 2-acrylamido-2-methylpropyl sulfonic acid or alkali metal salt thereof, and styrenesulfonic acid or alkali metal salt thereof.
Claim 18
Dependent Claim
30 words
The method of claim 9 wherein the composition comprises between about 325 to 1500 parts of the polymeric additive per million parts by weight of the one or more glycols.
Claim 19
Independent Claim
112 words
A method for inhibiting the precipitation of salts in glycol-based compositions when contacted with water which comprises adding about 25 to 2500 parts of a polymeric additive per million parts by weight of glycol prior to contacting the glycol-based composition including 0.001 to 15 percent by weight of one or more corrosion inhibitors with water, the polymeric additive being essentially free of cross-linking and being a copolymer or a terpolymer of acrylic acid or alkali metal salt thereof and one or more of the monomers selected from the group consisting of 2-acrylamido-2-methylpropyl sulfonic acid or metal salt thereof, 4-styrenesulfonic acid or metal salt thereof, a lower alkyl hydroxy acrylate, and mixtures thereof.
Claim 20
Independent Claim
112 words
A method for inhibiting the precipitation of salts in glycol-based compositions when contacted with water which comprises adding about 25 to 2500 parts of a polymeric additive per million parts by weight of glycol prior to contacting the glycol-based composition including 0.001 to 15 percent by weight of one or more corrosion inhibitors with water, the polymeric additive being essentially free of cross-linking and being a copolymer or a terpolymer of acrylic acid or alkali metal salt thereof and one or more of the monomers selected from the group consisting of 2-acrylamido-2-methylpropyl sulfonic acid or metal salt thereof, 4-styrenesulfonic acid or metal salt thereof, a lower alkyl hydroxy acrylate, and mixtures thereof.
Claim 21
Dependent Claim
18 words
The method of claim 17 wherein the glycol-based composition has a pH of between about 8.0 and 10.
Claim 22
Dependent Claim
28 words
The method of claim 17 wherein the polymeric additive is a copolymer of acrylic acid or alkali metal salt thereof and 2-acrylamido-2-methylpropyl sulfonic acid or metal salt thereof.
Claim 23
Dependent Claim
34 words
The composition of claim 19 wherein the copolymer has a weight ratio of acrylic acid or alkali metal salt thereof to 2-acrylamido-2-methylpropyl sulfonic acid or alkali metal salt thereof of between 25:75 and 95:5.
Claim 24
Dependent Claim
21 words
The method of claim 17 wherein the polymeric additive is a copolymer of acrylic acid and a lower alkyl hydroxy acrylate.
Claim 25
Dependent Claim
13 words
The method of claim 21 wherein the lower alkyl hydroxy acrylate is 2-hydroxy-propyl-acrylate.
Claim 26
Dependent Claim
36 words
The method of claim 17 wherein the polymeric additive is a terpolymer of acrylic acid or alkali metal salt thereof, 2-acrylamido-2-methylpropyl sulfonic acid or alkali metal salt thereof, and 4-styrenesulfonic acid or alkali metal salt thereof.
Claim 27
Dependent Claim
30 words
The method of claim 17 wherein the composition comprises between about 325 to 1500 parts of the polymeric additive per million parts by weight of the one or more glycols.
References Cited (Backward Citations)
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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) | 1995-06-02 | 1995-12-02 | 1996-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-02 | 1999-12-02 | 2000-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-02 | 2003-12-02 | 2004-06-02 | $7700.00 | Window Closed / Lapsed |