FILLER FOR EPOXY RESIN, AND EPOXY RESIN COMPOSITION

摘要

PROBLEM TO BE SOLVED: To provide a filler for epoxy resins which filler causes considerably little combination and coagulation with one another among silica particles in spite of being subjected to the treatment with a silane coupling agent. SOLUTION: The filler for epoxy resins is characterized in that a superfine silica powder, which has an average particle diameter D50 of 0.3μm or less, a 10% nominal diameter D100 of 0.5μm or less and a silanol group concentration of 0.5-5.0/nm<2> and forms no substantial structure constitution, is surface- treated with a silane coupling agent; the epoxy resin composition is formed by filling this filler.