Fuel cell separator, process for producing the same and...

Details Fuel cell separator, process for producing the same and... Fuel cell separator, process for producing the same and...

2006-06-20

2006-06-20

Yuan, Dah-Wei (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

Having earth feature

C429S006000

Reexamination Certificate

active

07063914

ABSTRACT:
This invention relates to a fuel cell separator of excellent electrical conductivity, gas impermeability and strength. The composition for a fuel cell separator of this invention comprises a resin binder with a viscosity of 0.01–0.5 Pa·s at 150° C. and a viscosity of 3 Pa·s or more at 25° C. and graphite particles at a weight ratio of 1:(5–15) and a curing accelerator. The resin binder is exemplified by an epoxy resin binder composed of an epoxy resin and a curing agent for the epoxy resin. The process for producing the fuel cell separator of this invention is practiced by kneading and molding the aforementioned composition for a fuel cell separator and curing above the curing temperature of the composition. The fuel cell separator of this invention to be obtained by the aforementioned process shows a bulk density of 1.90 g/cm3or more, a sheet resistance (areal pressure, 0.5 MPa) of 40 m Ωcm2or less, a gas permeability of 1×10−14cm2or less and a flexural strength of 30 MPa or more.

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International Search Report of PCT/JP01/07597 mailed on Dec. 4, 2001.
IB-99-19389-A1 Apr. 22, 1999 Choate et al.
International Preliminary Examination Report for PCT/JP01/07597 mailed on Jul. 7, 2003.

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