Fire-fighting compositions
AssigneeAngus Fire Armour Limited
InventorDavid J. Mulligan
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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.sub.3).(CH.sub.2).sub.2 or 3.N.sup.30 (CH.sub.3).sub.2.(CH.sub.2).sub.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.sup.-1 and is particularly suitable for employment in foam form.
Claims17
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 .multidot.(CH.sub.2).sub.2 .multidot.SO.sub.2 .multidot.N(H or CH.sub.3).multidot.(CH.sub.2).sub.2 or 3 .multidot.N.sup.+ (CH.sub.3).sub.2 .multidot.(CH.sub.2).sub.1-3 .multidot.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.
Dependencies are inferred from the claim text.