To obtain an epoxy resin composition having improved curability, moldability, and storage stability by incorporating an epoxy resin with a phenolic resin curing agent, a curing catalyst, and an inorganic filler.
The epoxy resin used is, for example, a phenol novolac epoxy resin. The phenolic resin curing agent used is for example, a phenol novolac resin. The curing agent is used to accelerate the curing reaction of the epoxy resin with the curing agent. The curing catalyst is a quat. phosphorus compound represented by the formula (wherein R1s and R2s are the same or different groups selected among 1-4C alkyls and 1-4C alkoxyls; m and n are each an integer of 1-3; a is an integer of 1-3; and b is an integer of 1-4). The amount of the curing catalyst is desirably 0.5-50 pts.wt. per 100 pts.wt. total amount of the epoxy resin and the curing agent. The inorganic filler chiefly used is, for example, ground spherical fused silica.
ISHIZAKI TATSUYA
UMENO MASAYUKI
ASANO HIDEKAZU
TOMIYOSHI KAZUTOSHI
OSADA MASAKAZU
SHIOBARA TOSHIO
SHINETSU CHEMICAL CO
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