Patent ID: 8252484
Filing Date: 2012-08-28
Classification: H01M,Y02E,Y02P

Abstract:
1. A separator for a fuel cell, comprising an electrically conducting flow path part and an insulating outer circumferential part surrounding the electrically conducting flow path part; wherein the electrically conducting flow path part comprises an electrically conducting resin composition comprising a carbonaceous material (A) and a thermoplastic resin composition (B) at a mass ratio (A)/(B) of 1:1 to 20:1 with the 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 thickness of 0.05 to 0.5 mm and a maximum thickness of the electrically conducting flow path part is from 1 to 3 times a minimum thickness of the electrically conducting flow path part; the insulating outer circumferential part comprises an insulating thermoplastic resin composition having a volume resistivity of 10 the electrically conducting path part and the insulating outer circumferential part are integrated, wherein the thermoplastic resin composition (B) and the insulating thermoplastic resin composition each comprises from 0.05 to 30 mass % of an elastomer component (C), and wherein the average particle diameter of the elastomer component (C) is from 0.01 to 5 μm and is smaller than the average particle diameter or average fiber length of the carbonaceous material (A).