Burns, Doane, Swecker & Mathis, LLP
Molded products for high voltage apparatus comprising brominated epoxy resins
"Molded products for high voltage apparatus comprising an" epoxy resin composition for molding comprising an epoxy resin (A), an acid anhydride (B), a curing accelerator (C), at least one coupling agent (D) and a filler (E). The epoxy resin (A) is a bifunctional brominated bisphenol A or a brominated bisphenol F, "epoxy resin and at least one bisphenol A, bisphenol F or bisphenol epoxy resin". The coupling agent (D) is selected from the group consisting of epoxysilane type coupling agents, phenylaminosilane type coupling agents, mercaptosilane type coupling agents and titanate type coupling agents, which has an average particle diameter of not more than 60 .mu.m and in which the content of particles having a diameter of not more than 5 .mu.m is not less than 5% by weight. The filler (E) comprises at least one of silica fillers or alumina fillers. The ratio of the number of acid anhydride groups of the acid anhydride (B) to the number of epoxy groups of the epoxy resin (A) is 0.5 to 1.5; the amount of the curing accelerator (C) is 0.5 to 10 parts by weight based on 100 parts by weight of the epoxy resin (A); the amount of the coupling agent (D) is 0.05 to 5 parts by weight based on 100 parts by weight of the filler (E); and the content of the filler (E) is 35 to 95% by weight of the resin composition. The epoxy resin composition has excellent mechanical properties such as high mechanical strength and toughness, and excellent thermal resistance.
Mitsubishi Denki Kabushiki Kaisha
C H C C C C C
C08G H01B C08G C08G C08G C08G C08L
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Takumi Fumio Yoshifumi Hirofumi Hirozoh Hiromi
Kikuchi Nogami Itabashi Fujioka Kanegae Ito