Preparation of patterned diffusion media

Details Preparation of patterned diffusion media Preparation of patterned diffusion media

2007-07-10

2007-07-10

Jolley, Kirsten (Department: 1762)

Coating processes

Foraminous product produced

C427S272000, C427S277000, C427S282000, C427S288000, C427S391000

Reexamination Certificate

active

10824032

ABSTRACT:
Gas diffusion media for use in fuel cells are provided that contain a pattern of deposited hydrophobic polymer such that less than 100% of the surface of the diffusion media is covered with hydrophobic polymer. The media are made by first wetting a sheet of carbon fiber paper in an aqueous emulsion of the hydrophobic polymer. The wetted sheet is contacted with a pattern member containing one or more openings oriented to correspond to a predetermined or desired pattern of hydrophobic polymer deposition. While still in contact with the pattern member, the sheet is heated or otherwise treated to cause evaporation of the water from the sheet. Evaporation while in contact with the pattern member takes place in such a way that hydrophobic polymer is concentrated in the sheet at the openings of the pattern member by the process of evaporation.

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International Search Report dated Jul. 17, 2006 for Appln. No. PCT/US05/02851 filed Feb. 2, 2005 corresponding to this application.

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