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US4424133A
Expired / Lapsed
US
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Fire-fighting compositions
Assignee: Angus Fire Armour Ltd
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Filing: 1981-09-22
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Granted: 1984-01-03
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Expires: 2001-09-22
Abstract
Abstract The invention is a composition for combating fires and for inhibiting release of flammable vapor from liquids, which is film-forming and comprises, in an aqueous medium, a blend of a hydrolyzed protein and an ampholytic sulphonamide fluorosurfactant falling within the general formula: C.sub.6 F.sub.13.(CH.sub.2).sub.2.SO.sub.2.N(H or CH 3 ).(CH 2 ) 2 or 3.N 30 (CH 3 ) 2 .(CH 2 ) 1-3 .COO-, said fluorosurfactant, when as a 0.1% aqueous solution, being film-forming on cyclohexane at normal temperatures. The composition preferably has an interfacial tension on 4-star petrol of at least 3.5 dyn.cm -1 and is particularly suitable for employment in foam form.
Inventors
- 👤 David J. Mulligan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:31
CPC Classifications
A; A62; A62D; A62D1/00; A62D1/0071; A62D1/0078; A62D1/0085
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
62 words
A fire-fighting film-forming composition which comprises in an aqueous medium a blend of a hydrolysed protein and an ampholytic sulphonamide fluorosurfactant falling within the general formula: C.sub.6 F.sub.13 ·(CH.sub.2).sub.2 ·SO.sub.2 ·N(H or CH.sub.3)·(CH.sub.2).sub.2 or 3 ·N.sup.+ (CH.sub.3).sub.2 ·(CH.sub.2).sub.1-3 ·COO.sup.-, said fluorosurfactant, when as a 0.1% aqueous solution, being film-forming on cyclohexane at normal temperatures, said composition being substantially free of fluorine-free surfactants.
Claim 2
Dependent Claim
62 words
A fire-fighting film-forming composition which comprises in an aqueous medium a blend of a hydrolysed protein and an ampholytic sulphonamide fluorosurfactant falling within the general formula: C.sub.6 F.sub.13 ·(CH.sub.2).sub.2 ·SO.sub.2 ·N(H or CH.sub.3)·(CH.sub.2).sub.2 or 3 ·N.sup.+ (CH.sub.3).sub.2 ·(CH.sub.2).sub.1-3 ·COO.sup.-, said fluorosurfactant, when as a 0.1% aqueous solution, being film-forming on cyclohexane at normal temperatures, said composition being substantially free of fluorine-free surfactants.
Claim 3
Dependent Claim
33 words
A composition according to claim 1 wherein the amount of the fluorosurfactant in the composition in concentrate form is from 1.5 to 10 parts by weight per 100 parts by weight of concentrate.
Claim 4
Dependent Claim
23 words
A composition according to claim 1 wherein the fluorosurfactant has the formula: C.sub.6 F.sub.13 ·(CH.sub.2).sub.2 ·SO.sub.2 ·NH·(CH.sub.2).sub.3 ·N.sup.+ (CH.sub.2).sub.2 ·CH.sub.2 ·COO hu -.
Claim 5
Dependent Claim
30 words
A composition according to claim 1 having a minimum interfacial tension of 3.5 dyn.cm -1 on standard United Kingdom 4-star petrol having a surface tension of 20±0.5 dyn.cm -1 .
Claim 6
Dependent Claim
37 words
A composition according to claim 1 wherein the amount of the fluorosurfactant present in the composition for application to a flammable liquid is at least 0.015 part by weight per 100 parts by weight of the composition.
Claim 7
Dependent Claim
36 words
A composition according to claim 1 wherein the amount of the fluorosurfactant in the composition for application to a flammable liquid is up to 0.15 part by weight per 100 parts by weight of the composition.
Claim 8
Dependent Claim
39 words
A composition according to claim 1 wherein the amount of the hydrolysed protein in the composition for application to a flammable liquid is from 0.3 to 3.0 parts by weight (solids) per 100 parts by weight of the composition.
Claim 9
Dependent Claim
30 words
A composition according to claim 1 wherein the amount of hydrolysed protein base in the concentrate form of the composition is from 30 to 90% by weight of the concentrate.
Claim 10
Dependent Claim
9 words
A composition according to claim 1 containing hexylene glycol.
Claim 11
Dependent Claim
11 words
A composition according to claim 1 containing a hydrophilic polymeric foam-stabiliser.
Claim 12
Dependent Claim
13 words
A composition according to claim 10 wherein the foam-stabiliser is an anionic heteropolysaccharide.
Claim 13
Dependent Claim
13 words
A composition according to claim 11 wherein the heteropolysaccharide is a xanthan gum.
Claim 14
Dependent Claim
28 words
A composition according to claim 11 wherein the amount of the foam-stabiliser is less than 1% by weight based on the composition for application to a flammable liquid.
Claim 15
Dependent Claim
17 words
A composition according to claim 1 which is for application in foam form to a flammable liquid.
Claim 16
Dependent Claim
36 words
A method of preventing or inhibiting the release of a flammable vapour from a liquid or combating a fire on a flammable liquid which comprises applying to the liquid surface a composition according to claim 1.
Claim 17
Dependent Claim
14 words
A method according to claim 15 wherein the composition is applied in foam form.
Claim 18
Dependent Claim
18 words
A method according to claim 16 wherein the foamed composition is applied by injection beneath the liquid surface.
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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) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |