Aqueous fire-fighting foams with reduced fluorine content
AssigneeTyco Fire Products LP
InventorsMartina E. Bowen, Yuan Xie, Pamela A. Havelka-Rivard
Life of this patent
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Abstract
Aqueous film forming firefighting composition concentrates are provided that contain an effective amount of a monomeric zwitterionic or anionic C6 perfluoroalkyl surfactant having a molecule weight less than 800 daltons. The compositions also contain an effective amount of a foam stabilizing agent, and an effective amount of at least one non-fluorinated surfactant. The composition has less than 0.8% F, and is substantially free of any surfactant containing a perfluoroalkyl group containing more than 6 carbon atoms. The composition meets Military Specification MIL-F-24385F.
Claims33
An aqueous film-firefighting composition concentrate comprising:
- (a) 0.5 to 20 wt. % of a perfluoroalkyl surfactant having a structure represented by the formula I:
- Rf—X-Y-L-Z I:
- wherein Rf is C6 straight or branched chain perfluoroalkyl;
- X is C2-C12 straight or branched chain alkylene, or C2-C12 straight or branched chain alkenylene containing 1 or 2 alkene moieties;
- Y is selected from the group consisting of:
- —S-CH2CH(R1)CON(R2)—, —O—CH2CH2—N(R3)(R4)—;
- —O—CH2CH(OR5)CH2—N(R3)(R4)—;
- —O—CH2CH(OR5)CH2—S—;
- —S—CH2CH(OR5)CH2—N(R3)(R4)—;
- and —S—CH2CH(OR5)CH2—S—;
- L is C2-C12 straight or branched chain alkylene, where one carbon atom in the chain optionally is replaced by N(R6)(R7)—;
- and
- Z is —OSO3−, —SO3−, or —CO2−,
- wherein R1, R2, R3, R4, R6 and R7, independently are H or straight or branched chain C1-C6 alkyl, and R5 is H or straight or branched chain C1-C6 alkyl or trialkylsilyl;
- (b) a foam stabilizing agent, and
- (c) at least one non-fluorinated surfactant,
- wherein said composition is substantially free of a perfluorinated surfactant that does not conform to formula I and wherein the final concentration of fluorine atoms on a weight percentage basis is less than 0.8%.
An aqueous film-firefighting composition concentrate comprising:
- (a) 0.5-20 wt. % of a perfluoroalkyl surfactant having a structure represented by the formula I:
- Rf—X-Y-L-Z I:
- wherein R1 is C6 straight or branched chain perfluoroalkyl;
- X is C2-C12 straight or branched chain alkylene, or C2-C12 straight or branched chain alkenylene containing 1 or 2 alkene moieties;
- Y is selected from the group consisting of:
- —S—CH2CH(R1)CON(R2)—, —O—CH2CH2—N(R3)(R4)—;
- —O—CH2CH(OR5)CH2—N(R3)(R4)—;
- —O—CH2—CH(OR5)CH2—S—;
- —S—CH2CH(OR5)CH2—N(R3)(R4)—;
- and —S—CH2CH(OR5)CH2—S—;
- L is C2-C12 straight or branched chain alkylene, where one carbon atom in the chain optionally is replaced by —N(R6)(R7)—;
- and
- Z is —OSO3−, —SO3−, or —CO2−,
- wherein R1, R2, R3, R4, R6 and R7, independently are H or straight or branched chain C1-C6 alkyl, and R5 is H or straight or branched chain C1-C6 alkyl or trialkylsilyl;
- (b) a fluorinated foam stabilizing agent containing 3 to 7 perfluorinated carbon atoms, and
- (c) at least one non-fluorinated surfactant, and
- wherein said composition is substantially free of a perfluorinated surfactant that does not conform to formula 1.
An aqueous film-firefighting composition concentrate comprising:
- (a) 0.5 to 20 wt. % of a zwitterionic and/or anionic perfluoroalkyl surfactant having a structure represented by the formula I:
- Rf—X—Y-L-Z I:
- wherein Rf is a C6 straight or branched chain perfluoroalkyl;
- X is a C2-C12 straight or branched chain alkylene, or C2-C12 straight or branched chain alkenylene containing 1 or 2 alkene moieties;
- Y is selected from the group consisting of:
- —S—CH2CH(R1)CON(R2)—,
- —O—CH2CH2—N(R3)(R4)—;
- —O—CH2CH(OR5)CH2—N(R3)(R4)—;
- —O—CH2CH(OR5)CH2—S—;
- —S—CH2CH(OR5)CH2—N(R3)(R4)—;
- and
- —S—CH2CH(OW)CH2—S—;
- L is C2-C12 straight or branched chain alkylene, where one carbon atom in the chain optionally is replaced by —N(R6)(R7)—, and
- Z is —OSO3−, —SO3−, or —CO2−,
- wherein R1, R2, R3, R4, R6 and R7, independently are H or straight or branched chain C1-C6 alkyl, and R5 is H or straight or branched chain C1-C6 alkyl or trialkylsilyl;
- (b) a foam stabilizing agent, which comprises a glycol ether and/or a fluorinated foam stabilizing agent containing 3 to 7 perfluorinated carbon atoms;
- and
- (c) at least one non-fluorinated surfactant,
- wherein said composition does not contain a perfluorinated surfactant that does not conform to formula I.
Dependencies are inferred from the claim text.