Toyoda Gosei Co., Ltd.

Yoshiaki Mase

Kenichiro Kaneko

Hidekazu Kurimoto

Akishige Seo

Mayuki Toriumi

Mitsue Tanaka

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 smaller cylindrical portion having a clamp groove formed on an outer peripheral surface thereof has a cylindrical surface portion which extends straight in an axial direction, an inclined surface portion which extends, while being inclined, radially outwardly from an end portion of the cylindrical surface portion and a vertical wall surface portion which extends straight radially outwardly from an end portion of the inclined surface portion, the cylindrical surface portion, the inclined surface portion and the vertical wall surface portion being formed continuously sequentially in that order from a side wall surface of the clamp groove. A stress concentration on a specific location on the smaller cylindrical portion can be suppressed by virtue of the stress alleviating action of these cylindrical surface portion, the inclined surface portion and the vertical wall surface portion.

Growing community of inventors

Kiyosu, Japan

Yoshiaki Mase