Patent ID: 11942666
Assignee: NISSHINBO CHEMICAL INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC D  H  Y | IPC H

Claim 19:
20. A method for manufacturing a precursor sheet for fuel cell separator comprising an electroconductive substrate sheet, a dense layer containing first graphite particles, and an electroconductive layer containing second graphite particles, the method comprising the steps of:
applying a composition for forming an electroconductive layer containing the second graphite particles and a resin to at least one surface of the substrate sheet or a surface of the dense layer to form the electroconductive layer; and
applying a composition for forming a dense layer containing the first graphite particles and a resin to at least one surface of the substrate sheet or a surface of the electroconductive layer to form the dense layer,
wherein the first graphite particles have a bulk density of 1.7 g/cm3 or more and a volume resistivity of 20 mΩ·cm or more when compressed at 30 MPa, and
the second graphite particles have a bulk density of 1.5 g/cm3 or more and a volume resistivity of less than 20 mΩ·cm when compressed at 30 MPa.