Perfluoroalkyl functionalized polyacrylamide for alcohol resistant-aqueous film-forming foam (AR-AFFF) formulation

Patent metadata

Field	Value
Publication number	US-9956447-B2
Application number	US-201314430905-A
Country	US
Kind code	B2
Filing date	Sep 25, 2013
Priority date	Sep 25, 2012
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

New high molecular weight fluoropolymers (fluoropolymer surfactants) are provided that are useful in compositions for use as fire extinguishing concentrates. The fluoropolymers contain C 4 -C 6 perfluoroalkyl groups, and substantially lack perfluoroalkyl groups containing more than 6 fluorine-substituted carbon atoms.

First claim

What is claimed is:

1. An aqueous firefighting composition concentrate comprising an effective amount of a fluoropolymer having the formula I

wherein:
R f is a C 4 -C 6 perfluoroalkyl group;
A is a bivalent linker moiety;
R ct is a chain transfer agent;
R 1 is H or methyl;
R 2 is H or methyl;
X is NH or O;
Y is NH 2 or OR, where R is H or C 1 -C 3 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.

2. The aqueous firefighting composition concentrate according to claim 1 , wherein said composition complies with the standard of EN 1568-3.

3. The aqueous firefighting composition concentrate according to claim 1 , wherein said composition further comprises an effective amount of one or more components selected from the group consisting of: an amphoteric hydrocarbon surfactant, an anionic hydrocarbon surfactant, a nonionic hydrocarbon surfactant, a C 6 fluorochemical surfactant, a foam aid, a freeze protection composition, a composition comprising ion sequestering, buffer, and anti-corrosion components, a polymeric film forming composition, a biocides and antimicrobial composition, an electrolyte composition, and a polysaccharide gum thickener.

4. The aqueous firefighting composition concentrate according to claim 1 , wherein R 1 and R 2 are H.

5. The aqueous firefighting composition concentrate according to claim 1 , wherein X is NH.

6. The aqueous firefighting composition concentrate according to claim 1 , wherein Y is NH 2 .

7. The aqueous firefighting composition concentrate according to claim 1 , wherein A is C 1 -C 12 alkyl optionally interrupted with —S— or —O—.

8. The aqueous firefighting composition concentrate according to claim 1 , wherein A is —(CH 2 ) 1-6 —S—(CH 2 ) 1-6 —.

9. The aqueous firefighting composition concentrate according to claim 1 , wherein A is —(CH 2 ) 2 —S—(CH 2 ) 2 —.

10. The aqueous firefighting composition concentrate according to claim 1 , wherein R ct is an alkyl mercaptan, an aralkyl mercaptan, a perfluoroalkyl alkyl mercaptan, an alkyl halide, an aralkyl halide, or a perfluoroalkyl alkyl halide.

11. The aqueous firefighting composition concentrate according to claim 1 , wherein R ct is C 1 -C 6 alkylthio or Rf—(CH 2 ) 2-6 —S—.

12. The aqueous firefighting composition concentrate according to claim 1 , wherein R f is perfluorohexyl.

13. The aqueous firefighting composition concentrate according to claim 1 , wherein R f is perfluorohexyl, A is Rf—(CH 2 ) 2 —S—(CH 2 ) 2 —, R ct is Rf—(CH 2 ) 2 —S—, R, R 1 and R 2 are H, X is NH, and Y is NH 2 .

14. The aqueous firefighting composition concentrate according to claim 1 , wherein said fluoropolymer has a molecular weight less than 100,000.

15. The composition according to claim 3 , wherein said composition comprises an amphoteric hydrocarbon surfactant in an amount up to 3% w/w.

16. The composition according to claim 3 , wherein said composition comprises an anionic hydrocarbon surfactant in an amount of 2-20% w/w.

17. The composition according to claim 3 , wherein said composition comprises a nonionic hydrocarbon surfactant in an amount up to 5% w/w.

18. The composition according to claim 3 , wherein said composition comprises a C6 fluorochemical surfactant in an amount up to 0.4% w/w.

19. The composition according to claim 3 , wherein said composition comprises a foam aid in an amount up to 15% w/w.

20. The composition according to claim 1 , wherein said composition comprises a freeze protection composition in an amount up to 45% w/w.

21. The composition according to claim 1 , wherein said composition comprises ion sequestering, buffer, and anti-corrosion components in an amount up to 5% w/w.

22. The composition according to claim 1 , wherein said composition comprises a polymeric film forming composition in an amount up to 2%.

23. The composition according to claim 1 , wherein said composition comprises biocides and/or antimicrobials in an amount up to 0.1% w/w.

24. The composition according to claim 1 , wherein said composition comprises electrolytes in an amount up to 3% w/w.

25. The composition according to claim 1 , wherein said composition comprises at least one polysaccharide gum thickener in an amount up to 10% w/w.

Assignees

• Tyco Fire & Security Gmbh

Inventors

• Martin Thomas Joseph
• Li Ming

Classifications

• C08L33/26

  Homopolymers or copolymers of acrylamide or methacrylamide · CPC title

• C08F220/06

  Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof · CPC title

• C08F220/585

  and containing other heteroatoms, e.g. 2-acrylamido-2-methylpropane sulfonic acid [AMPS] · CPC title

• C08L33/16

  Homopolymers or copolymers of esters containing halogen atoms · CPC title

• C08F2/38

  Polymerisation using regulators, e.g. chain terminating agents {, e.g. telomerisation} · CPC title