Patent ID: 7740990
Filing Date: 2010-06-22
Classification: H01M,Y02E

Abstract:
1. A polymer electrolyte fuel cell separator material comprising a graphite/cured resin molded product produced by binding a graphite powder using a mixed resin as a binder, the mixed resin being prepared by forming a mixture of at least one of a phenol novolac epoxy resin and a cresol novolac epoxy resin having an epoxy equivalent of 170 to 250 g/eq and a novolac phenolic resin having a hydroxyl equivalent of 120 to 200 g/eq so that an equivalent ratio by weight of epoxy groups to phenolic hydroxyl groups is 0.5 to 1.5, and adding an imidazole compound without an amino group to the mixture as a curing accelerator in an amount of 0.001 to 2.0 wt %, the separator material having, when immersed in hot water at 90° C., (1) a water absorption elongation percentage after 500 hours of immersion of 0.10% or less, (2) an amount of ammonium ions dissolved after 50 hours of immersion of 2 μg/g or less, and (3) an amount of total organic carbon (TOC) dissolved after 50 hours of immersion of 50 μg/g or less.