Claims
- 1. In an aqueous film-forming fire-fighting foamable liquid containing dissolved fluorocarbon and silicone surfactants in amounts that give the liquid a surface tension at least as low as 19 dynes per centimeter but do not give it good foamability and also containing one or more foamability-increasing surfactants that are neither fluorocarbons nor silicones, to bring the foamability of the liquid up to the level needed for a fire-fighting foam, the improvement according to which the fluorocarbon surfactant has the structure ##EQU6## where n is between 5 and 9.
- 2. The combination of claim 1 in which the silicone surfactant is an anionic substituted tertiary amine.
- 3. The combination of claim 1 in which the silicone surfactant is a sulfo-trialkylamine.
- 4. In an aqueous film-forming fire-fighting foamable liquid containing dissolved fluorocarbon and silicone surfactants in amounts that give the liquid a surface tension at least as low as 19 dynes per centimeter but do not give it good foamability and also containing one or more foamability-increasing surfactants that are neither fluorocarbons nor silicones, to bring the foamability of the liquid up to the level needed for a fire-fighting foam, the improvement according to which the liquid also contains an amino polycarboxy sequestering agent in an amount about one-twelfth to about one-fourth that of the fluorocarbon surfactant to reduce the concentration of fluorocarbon surfactant required to effect filming over liquid hydrocarbon.
- 5. In an aqueous film-forming fire-fighting foamable liquid containing dissolved fluorocarbon and silicone surfactants in amounts that give the liquid a surface tension at least as low as 18 dynes per centimeter but do not give it good foamability and also containing one or more foamability-increasing surfactants that are neither fluorocarbons nor silicones, to bring the foamability of the liquid up to the level needed for a fire-fighting foam, the improvement according to which the foamability-increasing surfactants include alkyl dimethylamino-propane sulfonic acid betaine in which the alkyl is from C.sub.8 to C.sub.12.
- 6. In an aqueous film-forming fire-fighting foamable liquid containing dissolved fluorocarbon and silicone surfactants in amounts that give the liquid a surface tension at least as low as 19 dynes per centimeter but do not give it good foamability and also containing one or more foamability-increasing surfactants that are neither fluorocarbons nor silicones, to bring the foamability of the liquid up to the level needed for a fire-fighting foam, the improvement according to which the liquid also contains in a concentration of from about one-sixth to about equal that of the fluorocarbon surfactant, of a surfactant having at least about 15 consecutive ethylene oxide units per mol and also having a hydrophobic chain of at least 14 carbons, to improve the fire-fighting effectiveness when the liquid is prepared with sea water.
- 7. The combination of claim 6 in which the consecutive ethylene oxide units are from about 20 to 25 per mol.
Parent Case Info
The present application is in part of continuation of applications Ser. No. 131,763 filed Apr. 6, 1971 (subsequently abandoned) and Ser. No. 254,404 filed May 18, 1972 (U.S. Pat. No. 3,849,315 granted Nov. 19, 1974).
US Referenced Citations (5)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
131763 |
Apr 1971 |
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