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US 9,956,447 B2Granted
Perfluoroalkyl functionalized polyacrylamide for alcohol resistant-aqueous film-forming foam (AR-AFFF) formulation
AssigneeTyco Fire & Security GmbH
InventorsThomas Joseph Martin, Ming Li
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Abstract
New high molecular weight fluoropolymers (fluoropolymer surfactants) are provided that are useful in compositions for use as fire extinguishing concentrates. The fluoropolymers contain C4-C6 perfluoroalkyl groups, and substantially lack perfluoroalkyl groups containing more than 6 fluorine-substituted carbon atoms.
Claims25
An aqueous firefighting composition concentrate comprising an effective amount of a fluoropolymer having the formula I
- wherein:
- Rf is a C4-C6 perfluoroalkyl group;
- A is a bivalent linker moiety;
- Rct is a chain transfer agent;
- R1 is H or methyl;
- R2 is H or methyl;
- X is NH or O;
- Y is NH2 or OR, where R is H or C1-C3 alkyl;
- n is 10-50;
- m is 5-100;
- and said fluoropolymer has a molecular weight of at least about 10,000, and wherein said composition is substantially free of any surfactant containing a perfluoroalkyl group containing more than 6 carbon atoms.
8 more elements
Dependencies are inferred from the claim text.