| abstract |
PURPOSE: To improve electrical and mechanical characteristics by using a resin composition containing a specific spherical fused silica for a main filler as a casting material. n CONSTITUTION: A resin composition of the present invention is prepared by containing 20-80% of spherical fused silica (treated with a silane coupling agent) having 10-50 μm of mean particle size (preferably 15-40 μm) and 1-100 μm of particle size distribution which is prepared by melting instantaneously a crystal silica powder containing 99.5% or more of SiO 2 in oxygen/propane flame of 2000°C, in a resin composition containing a resin (preferably cresol novolak epoxy resin or the like), a curing agent, a diluent, a plasticizer and the like. n COPYRIGHT: (C)1990,JPO |