Poly (arylene ether sulfone) having sulfoalkoxy group,...

Chemistry: electrical current producing apparatus – product – and – With pressure equalizing means for liquid immersion operation

Reexamination Certificate

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C429S314000, C521S025000, C521S030000, C521S034000, C528S099000, C528S391000

Reexamination Certificate

active

06986960

ABSTRACT:
A novel poly(arylene ether sulfone) having a sulfoalkoxy group, which has both of heat resistance and electroconductivity, is suitable as polymer electrolyte membranes used for high performance polymer electrolyte fuel cells, and does not use fluorine so that loads to the environment are small in the synthesis or disposal, a process of producing the same, and a polymer electrolyte membrane comprising the same. The poly(arylene ether sulfone) having a sulfoalkoxy group has a structural unit represented by the formula (1) mentioned hereinabove, and is produced by reacting a poly(arylene ether sulfone) having a hydroxyl group with a specific alkali metal compound and/or an organic base compound, followed by reacting with a specific sulfonating agent and then with a specific acid. A polymer electrolyte membrane is produced by film formation of the polymer.

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Michael D. Guiver et al., Modified Polysulfones. III. Synthesis and Characterization of Polysulfone Aldehydes for Reactive Membrane Materials, Journal of Polymer Science, Part A: Polym. Com. vol. 39, (Jan. 25, 2001), pp. 675-682.
Jochen A. Kerres, Development of Ionomer Membranes for Fuel Cells, Journal of Membrane Science, vol. 185, (Apr. 15, 2001), pp. 3-27.
Benoit Lafitte et al., Sulfophenylation of Polysulfones for Proton-Conducting Fuel Cell Membranes, Macromol. Rapid Commun. (Nov. 5, 2002), pp. 896-900.
European Search Report dated Jan. 28, 2003.

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