EPOXY RESIN COMPOSITION, ROTATING ELECTRIC MACHINE COIL, CASTING RESIN COMPOSITION AND ROTATING ELECTRIC MACHINE

摘要

PROBLEM TO BE SOLVED: To obtain a one-pack type epoxy resin composition having excellent workability and slight in waste resin by improvement in storage stability and high-temperature electric characteristics (tanδ) in an epoxy cationic polymerization resin, a rotating electric machine coil, a casting resin composition and a rotating electric machine. SOLUTION: This epoxy resin composition comprises an epoxy resin containing one or more epoxy groups as a main agent, an onium salt as a cationic polymerization initiator and an ionic adsorbent as essential components. The casting resin composition is obtained by formulating the epoxy resin composition with an inorganic filler having >=10 W/mK heat conductivity. The rotating electric machine is provided by casting the casting resin composition to a coil or a coil end and curing the composition.