Trimethylglycine as a freeze suppressant in fire fighting foams
AssigneeTyco Fire Products LP
InventorsMartina E. Bowen, Mark Adam-Christopher Siem, Stephen Aloysius Barker
Life of this patent
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Abstract
Fire foam concentrates are provided that contain trimethyl glycine as a freeze suppressant, an effective amount of at least one anionic, zwitterionic or nonionic surfactant, and an effective amount of a foam stabilizing agent. Methods of preparing fire fighting foams from the concentrates, and methods of fighting fires using these foams, also are provided.
Claims29
A fire-fighting foam comprising:
- (a) 0.25 wt %-3.6 wt % trimethyl glycine;
- (b) at least one surfactant selected from the group consisting of anionic, zwitterionic and nonionic surfactants;
- (c) a foam stabilizing agent;
- and
- (d) an aqueous liquid;
- wherein the fire-fighting foam is formed by foaming an aqueous firefighting foam concentrate that has been diluted with the aqueous liquid;
- and the aqueous firefighting foam concentrate contains the trimethyl glycine in an amount that is effective to depress the freezing point of said concentrate below 0° C.
A method of making a fire-fighting foam, comprising foaming a foam concentrate composition with an aqueous liquid to form the fire-fighting foam, wherein the foam concentrate composition comprises:
- (a) trimethyl glycine in an amount that is effective to depress the freezing point of said foam concentrate composition below 0° C.;
- (b) at least one surfactant selected from the group consisting of anionic, zwitterionic and nonionic surfactants;
- and
- (c) a foam stabilizing agent;
- wherein the fire-fighting foam includes 0.25 wt %-3.6 wt % of the trimethyl glycine.
A fire-fighting foam comprising:
- (a) 0.25 wt %-3.6 wt % trimethyl glycine;
- (b) anionic surfactant;
- (c) zwitterionic surfactant;
- (d) nonionic surfactant;
- (e) polymeric foam stabilizing agent;
- and
- (f) an aqueous liquid.
A method of making a fire-fighting foam, comprising foaming a foam concentrate composition with an aqueous liquid to form the fire-fighting foam, wherein the foam concentrate composition comprises:
- (a) trimethyl glycine in an amount that is effective to depress the freezing point of said foam concentrate composition below 0° C.;
- (b) 0.1 to 10 wt % anionic surfactant;
- (c) 0.1 to 10 wt % zwitterionic surfactant;
- (d) 0.3 to 15 wt % nonionic surfactant;
- and
- (e) 0.5-50 wt % foam stabilizing agent;
- wherein the fire-fighting foam includes 0.25 wt %-3.6 wt % of the trimethyl glycine.
Dependencies are inferred from the claim text.