Toyoda Gosei Co., Ltd.

Mitsue Tanaka

Hidekazu Kurimoto

Kenichiro Kaneko

Akishige Seo

Yoshiaki Mase

A method of producing a sealing member for a fuel cell includes: setting a base material made of a modified polypropylene in a mold; bringing a hydrosilicone crosslinked ethylene/&#x3b1;-olefin/non-conjugated diene copolymer into contact with the base material and performing molding in the mold; and vulcanizing the hydrosilicone crosslinked ethylene/&#x3b1;-olefin/non-conjugated diene copolymer and at the same time, bonding the hydrosilicone crosslinked ethylene/&#x3b1;-olefin/non-conjugated diene copolymer and the base material by vulcanization, in the mold with a molding temperature set to a temperature that is higher than a vulcanization start temperature of the hydrosilicone crosslinked ethylene/&#x3b1;-olefin/non-conjugated diene copolymer and lower than a melting point of the modified polypropylene.

Method of producing sealing member for fuel cell and rubber composition for molding

A weather strip includes an ethylene-&#x3b1;-olefin-nonconjugated diene copolymer rubber composition having a volume resistivity of no less than 1.0E+6 &#x3a9;&#xb7;cm and having a specific gravity of less than 1.30, the rubber composition including: carbon black in an amount of 40 parts by mass to 140 parts by mass; and at least one polymer having a specific gravity of no more than 1.8 and an ethylene content of no more than 70 wt % and at least one polymer having a specific gravity of no more than 1.8 and an ethylene content of no less than 70 wt % in a collective amount of 5 parts by mass to 50 parts by mass, per 100 parts by mass of an EPDM polymer. At least a mount base of the weather strip, which is to be mounted to a car body, is formed of the rubber composition.

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Kiyosu, Japan

Mitsue Tanaka