Asymmetric polymer film, method for the production and...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof

Reexamination Certificate

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C528S363000, C528S424000, C210S500210, C210S640000, C210S650000, C521S025000, C521S027000

Reexamination Certificate

active

07834131

ABSTRACT:
The present invention relates to an asymmetric polymer film, in particular based on polazoles, a method for the production of the same and its use. The polyazole-based asymmetric polymer film according to the invention has a smooth and a rough side and enables, on account of its asymmetric structure, rapid and homogeneous doping with acids to form a proton-conducting membrane. The polyazole-based asymmetric polymer film according to the invention can be used in diverse ways on account of its excellent chemical, thermal and mechanical properties and is particularly suitable for the production of polymer electrolyte membranes (PEM) for so-called PEM fuel cells.

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International Search Report for PCT/EP2004/007570, dated Sep. 27, 2004.
International Preliminary Report on Patentability from counterpart International Application No. PCT/EP2004/007570, dated May 29, 2006.
Written Opinion of the International Preliminary Examining Authority from counterpart International Application No. PCT/EP2004/007570.
Gang, X., et al., “Electrolyte Additives for Phosphoric Acid Fuel Cells”,J. Electrochem, Soc.,140(4):896-902 (Apr. 1993).
Razaq, M. et al., “Perfluorosulfonimide as an Additive in Phosphoric Acid Fuel Cell”,J. Electrochem. Soc.,136(2)385-390 (Feb. 1989).

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