US5389276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aircraft deicing fluid with thermal and pH-stable wetting agent
Assignee: Texaco Inc
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Filing: 1993-11-15
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Granted: 1995-02-14
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Expires: 2013-11-15
Abstract
Abstract Disclosed is an ethylene glycol based deicing/anti-icing composition which contains a thickener comprising a polyacrylic acid having a molecular weight of from about 90,000 to 100,000 and a wetting agent from the group consisting of nonylphenol ethoxylates, alkarylsulfonates, polyoxyethylene phosphates and tetrafunctional block copolymers of EO/PO on an ethylene diamine backbone and demonstrates improvement in anti-icing ability as measured by holdover time while not adversely effecting aerodynamic performance or Newtonian rheology of the deicer measured by passing the minimum requirements of the AMS test for Type I fluids.
Inventors
- 👤 David A. Coffey
- 👤 Edward C. Y. Nieh
- 👤 Richard A. Armstrong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:34
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/18; C09K3/185
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
145 words
A deicing/anti-icing composition comprising: an alkylene glycol component present in an amount between about 80% and 98% by weight of the composition; a thickener comprising a polyacrylic acid homopolymer or copolymer having a molecular weight between about 600 and 200,000; a corrosion inhibitor selected from the group consisting of an alkaline metal salt of tolytriazole or benzotriazole; a buffer selected from the group consisting of phosphates and borates; a neutralizer selected from the group consisting of alkali metal hydroxides, organic amines bases and mixtures thereof present in an amount sufficient to neutralize between about 20 wt % to 90 wt % of the carboxylic acid groups present in the thickener; and a surfactant/wetting agent selected from the group consisting of nonylphenol ethoxylates, alkylaryl sulfonates having 7-20 carbon alkyl groups, polyoxyethylene phosphates and tetrafunctional block copolymers of ethylene oxide/propylene oxide (EO/PO) on an ethylene diamine backbone.
Claim 2
Dependent Claim
145 words
A deicing/anti-icing composition comprising: an alkylene glycol component present in an amount between about 80% and 98% by weight of the composition; a thickener comprising a polyacrylic acid homopolymer or copolymer having a molecular weight between about 600 and 200,000; a corrosion inhibitor selected from the group consisting of an alkaline metal salt of tolytriazole or benzotriazole; a buffer selected from the group consisting of phosphates and borates; a neutralizer selected from the group consisting of alkali metal hydroxides, organic amines bases and mixtures thereof present in an amount sufficient to neutralize between about 20 wt % to 90 wt % of the carboxylic acid groups present in the thickener; and a surfactant/wetting agent selected from the group consisting of nonylphenol ethoxylates, alkylaryl sulfonates having 7-20 carbon alkyl groups, polyoxyethylene phosphates and tetrafunctional block copolymers of ethylene oxide/propylene oxide (EO/PO) on an ethylene diamine backbone.
Claim 3
Dependent Claim
25 words
The deicing/anti-icing composition of claim 1 where the alkylene glycol component is selected from ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol and mixtures thereof.
Claim 4
Dependent Claim
14 words
The deicing/anti-icing composition of claim 2 wherein the alkylene glycol component is ethylene glycol.
Claim 5
Dependent Claim
17 words
The composition of claim 1 wherein the polyacrylic acid is a homopolymer selected from acrylic or methacrylic.
Claim 6
Dependent Claim
10 words
The composition of claim 4 wherein the homopolymer is acrylic.
Claim 7
Dependent Claim
16 words
The composition of claim 1 wherein the polyacrylic acid is a copolymer consisting essentially of maleic/acrylic.
Claim 8
Dependent Claim
17 words
The composition of claim 1 wherein the polyacrylic acid has a molecular weight between 70,000 and 120,000.
Claim 9
Dependent Claim
23 words
The composition of claim 1 wherein the polyacrylic acid homopolymer has a molecular weight of from less than 90,000 to greater than 100,000.
Claim 10
Dependent Claim
25 words
The composition of claim 1 where the thickener is present in an amount between about 0.2% and about 0.8% by weight of the anti-icing composition.
Claim 11
Dependent Claim
24 words
The composition of claim 1 wherein the surfactant/wetting agent is a tetrafunctional block copolymer of ethylene oxide/propylene oxide (EO/PO) on an ethylene diamine backbone.
Claim 12
Dependent Claim
20 words
The composition of claim 1 wherein the surfactant/wetting agent is an alkylaryl sulfonate having 7 to 20 carbon alkyl groups.
Claim 13
Dependent Claim
13 words
The composition of claim 1 wherein the surfactant/wetting agent is a polyoxyethylene phosphate.
Claim 14
Dependent Claim
23 words
The composition of claim 1 wherein the polyacrylic acid copolymer has a molecular weight of from less than 90,000 to greater than 100,000.
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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) | 1998-02-13 | 1998-08-15 | 1999-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-13 | 2002-08-15 | 2003-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-13 | 2006-08-15 | 2007-02-14 | $7700.00 | Window Closed / Lapsed |