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Abstract

Disclosed is a process of preparing fluorinated material which comprises thermally treating the mixture of carbon black and hydrocarbon polymer compound powder for covering the surface of the carbon black with the latter and fluorinating the hydrocarbon polymer compound. The thermal treatment can be conducted in two stages. The fluorinated material prepared in accordance with the present invention can provide much more pore volumes acting as gas networks in, for example, an electrode which exhibits high gas permeability or gas supplying ability. Further, the hydrophobicity is as high as that of the material prepared in accordance with mixing carbon black with hydrocarbon polymer compound dispersed in an organic solvent, and is higher than that of the conventional mixture of carbon black and polytetrafluoroethylene particles. The fluorinated material is preferably employed to a fuel cell as gas network material.

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First Claim