The Yokohama Rubber Co., Ltd.

Nippon Chemi-con Corporation

Sony Corporation

Hiroaki Fujita

Hiroaki Nakano

Masayoshi Abe

Tetsuji Kawazura

Makoto Ashiura

Eiichi Funatsu

Masashi Ozawa

Ken Matsui

Kazuhiko Kimura

Masatoshi Iemura

An electrolytic capacitor sealer is formed of a modified butyl rubber composition obtained by using an organic peroxide to crosslink a modified butyl rubber composition which has been modified by reacting butyl rubber with a compound (a) having in the molecule a nitroxide free radical that is stable at room temperature even in the presence of oxygen, a radical initiator (b), and a bifunctional or higher radical polymerizable monomer (c), and of a modified butyl rubber composition obtained by compounding a radical polymerizable monomer (c) with a modified butyl rubber composition that has been obtained by reacting butyl rubber with a compound (a) having in the molecule a nitroxide free radical that is stable at room temperature even in the presence of oxygen and a radical initiator (b), and then crosslinking the composition thus obtained with an organic peroxide.

Sealing material for electrolytic capacitor and electrolytic capacitor employing the sealing material

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Tokyo, Japan

Hiroaki Fujita