Poly-perfluoroalkyl substituted polyethyleneimine foam stabilizers and film formers
AssigneeTyco Fire Products LP
InventorYuan Xie
Life of this patent
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Abstract
Poly-perfluoroalkyl substituted polyethyleneimine compositions are provided that act as foam stabilizers and film formers when used in fire-fighting foam concentrates. The polyethylene compositions are soluble in water, but have only low solubility in polar solvents. When aqueous film forming foam generated from these concentrates is applied to burning polar solvent the polyethyleneimine compositions precipitate at the polar solvent/foam interface and inhibit the collapse and destruction of the foam.
Claims9
An aqueous film-forming firefighting composition comprising an effective amount of a foam stabilizing agent comprising a branched substituted polyamine wherein the amino groups of said polyamine are substituted with:
- (a) —(CH2)m(CF2)nF, wherein m is 1-12 and n is 4-16;
- and
- (b) a hydrophilic moiety selected from the group consisting of
- —(CH2)pCHOH(CH2)qSO3−,
- (CH2)pCHOH(CH2)qNH4+ and
- (CH2)pCOO−;
- wherein p and q independently are 1-6 and p+q is 2-8;
- wherein said substituted polyamine has a weight average molecular weight Mw of between about 5 kDa and 25 kDa prior to substitution;
- and
- wherein said stabilizer has a fluorine content of about 15 to about 25%.
Dependencies are inferred from the claim text.