Claims
- 1. A fuel-cell, including a polymer electrolyte fuel-cell separator at least one side edge of which is sealed with a sealing material comprising in parts by weight as essential components:
(A) 100 parts of an organopolysiloxane containing at least two alkenyl groups each attached to a silicon atom in a molecule, (B) 5 to 50 parts of a resinous copolymer composed mainly of R3SiO1/2 units and SiO2 units in a molar ratio of 0.5:1 to 1.5:1, wherein R is a substituted or unsubstituted monovalent hydrocarbon group, and containing 5×10−3 to 1×10−4 mol/g of vinyl groups, (C) 0.5 to 20 parts, per 100 parts of components (A) and combined, of an organohydrogenpolysiloxane containing at least two hydrogen atoms each attached to a silicon atom in a molecule, (D) 10 to 30 parts, per 100 parts of components (A) and (B) combined, of fumed silica having a specific surface area of 150 to 400 m2/g, and (E) a catalytic amount of an addition reaction catalyst.
- 2. The fuel cell of claim 1, wherein the molar ratio of Si—H groups in organohydrogenpolysiloxane (C) to the total of silicon atom bonded alkenyl groups in the organopolysiloxane (A) and resinous copolymer (B) is 0.8:1 to 5.0:1.
- 3. The fuel cell of claim 1, wherein the organopolysiloxane (A) has an average degree of polymerization of 100 to 2,000 and at least 90% of the entire organic groups attached to silicon atoms therein are methyl.
- 4. The fuel cell of claim 1, wherein the organopolysiloxane (A) is that of formula (1)
- 5. The fuel cell of claim 4, wherein R1 is a member selected from the group consisting of methyl, ethyl and propyl.
- 6. The fuel cell of claim 1, wherein R is a member selected from the group consisting of methyl, ethyl and propyl.
- 7. The fuel cell of claim 1, wherein the resinous copolymer (D) contains 3×10−3 to 2×10−4 mol/g of vinyl groups.
- 8. A method for sealing at least one side edge of a polymer electrolyte fuel-cell separator by contacting the side edge to be sealed with a sealing material comprising in parts by weight as essential components:
(A) 100 parts of an organopolysiloxane containing at least two alkenyl groups each attached to a is silicon atom in a molecule, (B) 5 to 50 parts of a resinous copolymer composed mainly of R3SiO1/2 units and SiO2 units in a molar ratio of 0.5:1 to 1.5:1, wherein R is a substituted or unsubstituted monovalent hydrocarbon group, and containing 5×10−3 to 1×10−4 mol/g of vinyl groups, (C) 0.5 to 20 parts, per 100 parts of components (A) and (B) combined, of an organohydrogenpolysiloxane containing at least two hydrogen atoms each attached to a silicon atom in a molecule, (D) 10 to 30 parts, per 100 parts of components (A) and (B) combined, of fumed silica having a specific surface area of 150 to 400 m2/g, and (E) a catalytic amount of an addition reaction catalyst.
- 9. The method of claim 8 further comprising curing the sealing material.
- 10. The method of claim 8 further comprising curing the sealing material by heating the sealing material to a temperature between about 100 and about 300° C. for a time of from about ten seconds to about 30 minutes.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2001-114893 |
Apr 2001 |
JP |
|
Parent Case Info
[0001] This application is a divisional of co-pending application Ser. No. 10/119,148, filed on Apr. 10, 2002, the entire contents of which are hereby incorporated by reference and for which priority is claimed under 35 U.S.C. § 120; and this application claims priority of application Ser. No. 2001-114893 filed in Japan on Apr. 13, 2001 under 35 U.S.C. § 119.
Divisions (1)
|
Number |
Date |
Country |
Parent |
10119148 |
Apr 2002 |
US |
Child |
10704910 |
Nov 2003 |
US |