Claims
- 1. An electroconductive curable resin composition comprising:
(A) a graphite powder containing boron in the graphite crystal, and (B) a curable resin and/or a curable resin composition, at a ratio of 20 to 99.9:80 to 0.1 in terms of the mass ratio of the component (A) to component (B), provided that the sum of the mass ratios of the components (A) and (B) is 100.
- 2. An electroconductive curable resin composition comprising:
(A) a graphite powder containing boron in the graphite crystal, (B) a curable resin and/or a curable resin composition, and (C) vapor-phase process carbon fiber having a fiber diameter of 0.05-10 μm and a fiber length of 1-500 μm, and/or carbon nanotube having a fiber diameter of 0.5-100 nm and a fiber length of 0.01-10 μm.
- 3. An electroconductive curable resin composition according to claim 2, wherein the mass ratio of the sum of the component (A) and the component (C) to the component (B) (A+C:B) is 20 to 99.9:80 to 0.1, provided that the sum of the mass ratios of the components (A), (B) and (C) is 100.
- 4. An electroconductive curable resin composition according to claim 2 or 3, wherein the mass ratio of the component (A) to the component (C) is 60 to 99.9:40 to 0.1, provided that the sum of the mass ratios of the components (A) and (C) is 100.
- 5. An electroconductive curable resin composition according to any one of claims 1-4, wherein the powder electric resistivity of the component (A) in the right angle direction is 0.06 Ωcm or less with respect to the applied pressure direction in a state where the graphite powder as the component (A) is pressed so as to provide a bulk density of the graphite powder of 1.5 g/cm3.
- 6. An electroconductive curable resin composition according to any one of claims 1-5, wherein the component (A) has an average particle size of 5 to 80 μm.
- 7. An electroconductive curable resin composition according to any one of claims 1 to 6, wherein the component (A) is a graphite powder having a specific surface area of 3 m2/g or less, an aspect ratio of 6 or less, a tapping bulk density of 0.8 g/cm3 or more and a lattice spacing (Co value) of 6.745 Å or less.
- 8. An electroconductive curable resin composition according to any one of claims 1 to 7, wherein the component (B) comprises at least one resin selected from a phenolic resin, an unsaturated polyester resin, an epoxy resin, a vinyl ester resin and an allyl ester resin; and a curing agent.
- 9. An electroconductive curable resin composition according to claim 8, wherein the component (B) comprises an epoxy resin and a phenolic resin.
- 10. An electroconductive curable resin composition according to claim 9, wherein the epoxy resin comprises a cresol novolak-type epoxy resin and the phenolic resin comprises a novolak-type phenolic resin.
- 11. An electroconductive curable resin composition according to claim 8, wherein the component (B) comprises a vinyl ester resin and/or an allyl ester resin, at least one monomer selected from allyl ester monomer, acrylic acid ester monomer, methacrylic acid ester monomer and styrene monomer; and a radical polymerization initiator.
- 12. An electroconductive curable resin composition according to claim 11, wherein the vinyl ester resin is novolak-type vinyl ester resin.
- 13. An electroconductive curable resin composition according to any one of claims 1 to 12, wherein the component (A) is a graphite powder containing from 0.05 to 5.0 mass % of boron.
- 14. An electroconductive cured product obtained by curing an electroconductive curable resin composition according to any one of claims 1 to 13, which has a volume resistivity of 2×10−2 Ωcm or less, a contact resistance of 2×10−2 Ωcm2 or less and a thermal conductivity of 1.0 W/m·K or more.
- 15. A process for producing an electroconductive cured product according to claim 14, which comprises forming the cured product by any one of compression molding, transfer molding, injection molding and injection-compression molding.
- 16. A separator for fuel cells, obtained by curing an electroconductive curable resin composition according to any one of claims 1 to 13 which is an electroconductive curable resin composition comprising from 50 to 95 mass % of the component (A) (or, from 50 to 95 mass % of the sum of the component (A) and the component (C), if any), the separator having a volume resistivity of 2×10−2 Ωcm or less, a contact resistance of 2×10−2 Ωcm2 or less, a thermal conductivity of 1.0 W/m·K or more and a gas permeability of 1×10−6 cm2/sec or less.
- 17. A process for producing a separator for fuel cells, which comprises forming a separator for fuel cells by any one of compression molding, transfer molding, injection molding and injection-compression molding, the separator being obtained by curing an electroconductive curable resin composition according to any one of claims 1 to 13 which is an electroconductive curable resin composition comprising from 50 to 95 mass % of the component (A) (or, from 50 to 95 mass % of the sum of the component (A) and the component (C), if any), and the separator having a volume resistivity of 2×10−2 Ωcm or less, a contact resistance of 2×10−2 Ωcm2 or less, a thermal conductivity of 1.0 W/m·K or more and a gas permeability of 1×10−6 cm2/sec or less.
Priority Claims (2)
Number |
Date |
Country |
Kind |
2000-166965 |
Jun 2000 |
JP |
|
2001-113764 |
Apr 2001 |
JP |
|
Parent Case Info
[0001] This application claims the priority of an application based on U.S. Provisional Application Serial No. 60/221,924 (filed on Jul. 31, 2000).
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/JP01/04751 |
6/5/2001 |
WO |
|