Patent ID: 8252483

Claim:
A separator for a fuel cell, comprising an electrically conducting resin composition, and comprising an electrically conducting flow path part; wherein the electrically conducting resin composition comprises a carbonaceous material (A) and a thermoplastic resin composition (B) at a mass ratio (A)/(B) of 1 to 20 with a total mass of (A) and (B) accounting for 80 to 100 mass % in the composition; the electrically conducting flow path part has a corrugated shape having a recess and a projection on each of front and back surfaces thereof, where the recess constitutes a groove for a flow path; the electrically conducting flow path part has a wall thickness of 0.05 to 0.5 mm and a maximum wall thickness of the electrically conducting flow path part is from 1 to 3 times a minimum wall thickness of the electrically conducting flow path part; the thermoplastic resin composition (B) comprises from 0.05 to 30 mass % of an elastomer component (C), based on a total mass of the thermoplastic resin composition (B); and the average particle diameter of the elastomer component (C) is from 0.01 to 5 gm and is smaller than the average particle diameter or average fiber length of the carbonaceous material (A).