Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From fluorine-containing reactant
Reexamination Certificate
2006-05-26
2009-06-02
Gulakowski, Randy (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From fluorine-containing reactant
Reexamination Certificate
active
07541426
ABSTRACT:
Fluorinated comb co-polymers have a main chain including a semi-rigid hydrophobic fluorinated poly(ether) backbone and comb segments in the form of flexible and monodisperse side chains that are more hydrophilic than the backbone. The side chains may be hydrophilic polymeric chains obtained from “living-type” polymerization, for example polymethacrylates, polyethylene oxides, polystyrenes. Hydrophilic functionality, for example, ionic groups may be selectively introduced onto the side chain post polymerization. The side chain may be sulfonated α-methyl polystyrene. Such polymers are useful in proton exchange membranes.
REFERENCES:
patent: 6827986 (2004-12-01), Asukabe et al.
patent: 2005/0288483 (2005-12-01), Ding et al.
Hickner, M. A. et al., “Alternative Polymer Systems for Proton Exchange Membranes (PEMs)”;Chem. Rev. 104, 4587-4612, (2004).
Kreuer, K. D,. “On the development of proton conducting membranes for hydrogen and methanol fuel cells”;J. Membrane Sci. 185, 29-39, (2001).
Karlsson, L. E. & Jannasch, P., “Polysulfone ionomers for proton-conducting fuel cell membranes: sulfoalkylated polysulfones”;J. Membr. Sci. 230, 61-70, (2004).
Ghassemi, et al., “New multiblock copolymers of sulfonated poly(4′-phenyl-2,5-benzophenone) and poly(arylene ether sulfone) for proton exchange membranes II”;Polymer45, 5855-5862. (2004).
Yang, Y., et al., “Synthesis of sulfonated polysulfone-block-PVDF copolymers: enhancement of proton conductivity in low ion exchange capacity membranes”;Macromolecules37, 1678-1681, (2004).
Ding, J., et al., “Enhanced conductivity in morphologically controlled proton exchange membranes:synthesis of macromonomers by SFRP and their incorporation into graft polymers”;Macromolecules35, 1348-1355, (2002).
Quirk, R. P., & Wang, Y, “Anionic difunctionalization with 1,1-bis(4-t-butyldimethyislloxyphenyl)ethylene. synthesis of ω, ω-bls(phenol)-functionalixed polystyrene condensation macromonomers”;Polym. Internat. 31, 51-59, (1993).
Jannasch, P., “Fuel Cell Membrane Materials by Chemical Grafting of Aromatic Main-Chain Polymers”;Fuel Cells, 5, 248-260 (2005).
Ding Jianfu
Guiver Michael D.
Norsten Tyler B.
Qi Yinghua
Anderson J. Wayne
Baumstein Kyle
Gulakowski Randy
National Research Council of Canada
LandOfFree
Fluorinated comb-shaped polymers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fluorinated comb-shaped polymers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fluorinated comb-shaped polymers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4133787