| 摘要 |
PROBLEM TO BE SOLVED: To provide a sealing material for an electrolytic capacitor having better heat resistance than peroxide-crosslinked butyl rubber and a longer life even at high temperatures. SOLUTION: In a sealing material produced by peroxide-crosslinking isobutylene, isoprene and divinylbenzene, 2,2,4-trimethyl-1,2 a dihydroquinolin polymer is added as an antioxidant.
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