Perfluoroalkyl composition with reduced chain length
AssigneeTyco Fire Products LP
InventorThomas Joseph Martin
Life of this patent
Estimating the term…
Abstract
Novel fluorosurfactants are provided that contain perfluoroalkyl groups no longer than perfluorohexyl (C6). The surfactants are useful in the preparation of aqueous film forming foams (AFFF) and alcohol-resistant film-forming foams (AR-AFFF) for firefighting. Unexpectedly, these compounds have activity in AFFF and AR-AFFF applications that is comparable and even superior to conventional surfactants that contain perfluoroalkyl groups that are perfluorooctyl (C8) and longer. Also provided are methods of making the novel surfactants, as well as foam concentrates, methods of making foam and methods of fighting fires using foam containing the novel surfactants.
Claims24
A fire-fighting foam, comprising a composition comprising a surfactant having the formula
- wherein Rf is CF3(CF2)n or CHF2(CF2)n, wherein n is 3-5;
- A is a linker selected from the group consisting of —CH2CH2—, —CH2CH2—S—, —CH2CH2—O—, —CH2CH2—CO—NH—, —CH2CH2—NH—CO— —SO2NH—, —NHSO2—, —OC(O)—, —C(O)O—, —S(O)—, and —SO2—;
- X is selected from the group consisting of —S—, —O—, —SO2—, —NR—, —CO2—, —CONR—, —SO2NR—, —OP(O)(OR)O—, S(O), —OC(O)—, —NRC(O)—, and —NRSO2—;
- Y is selected from the group consisting of —CONHR, CO2H, —CO2R, —OC(O)R, and —C6H4SO3M;
- R is H or C1-C6 alkyl;
- R′ is H or C1-C6 alkyl;
- M is a metal ion;
- and
- m is 2-8 and p is 2-100,
- and wherein said composition is substantially free of any surfactant containing a perfluoroalkyl group containing more than 6 carbon atoms.
Dependencies are inferred from the claim text.