| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject composition stable to a decomposed gas of SF6 and having a high mechanical strength and a low permittivity by formulating an epoxy resin having specific epoxy groups with a curing agent for the epoxy resin, a spherical filler, etc., in a specified proportion. SOLUTION: This composition is obtained by including (A) one equivalent of an epoxy resin having two or more 1,2-epoxy groups based on one molecule, e.g. a bisphenol A diglycidyl ether, bisphenol F diglycidyl ether and an alicyclic type diglycidyl ester type epoxy resins, (B) 0.7-1.0 equivalent of a curing agent for the epoxy resin, e.g. an aromatic or an alicyclic type polycarboxylic acid anhydride or a polycarboxylic acid anhydride in which rubber grains are dispersed and (C) 35-55 vol.% of a spherical filler comprising the material of, e.g. alumina, crystalline silica, fused silica, dolomite, boron nitride, aluminum nitride, aluminum fluoride and calcium fluoride or a mixture of the spherical filler with a crushed filler.
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