| 摘要 |
PROBLEM TO BE SOLVED: To prevent deterioration in characteristics of voltage holding rate by incorporating a specified epoxy resin, hardening agent, polybutadiene maleate, solvent and inorg. filler. SOLUTION: This compsn. contains an epoxy resin containing an orthocresol novolac epoxy resin and dicyclopentadiene epoxy resin, hardening agent, polybutadiene maleate, solvent and inorg. filler. The total amt. of the orthocresol novolac epoxy resin and the dicyclopentadiene epoxy resin is preferably controlled to 60 to 100 pts.wt. to 100 pts.wt. of the whole epoxy resin. The number average mol.wt. of the polybutadiene in the main chain of polybutadiene maleate is preferably 500 to 2,000. The addition ratio of maleic acid anhydride groups to the main chain polybutadiene is preferably 0.3 to 3.2 (mol/mol). The compounding proportion of the polybutadiene maleate is preferably 1 to 10 pts.wt. to 100 pts.wt. of whole epoxy resin.
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