EPOXY RESIN, EPOXY RESIN COMPOSITION, PREPREG AND THEIR CURED PRODUCT

摘要

PROBLEM TO BE SOLVED: To provide an epoxy resin having high thermal conductivity and a cured product thereof.SOLUTION: An epoxy resin is obtained through the following steps (A) to (B). Step (A): the formula (1) and a hydroxybenzaldehyde having a specific structure are reacted to obtain a phenolic compound (a). Step (B): the phenolic compound (a) obtained in the step (A) is reacted with epihalohydrin to obtain an epoxy resin. An epoxy resin composition comprises an epoxy resin, a curing agent and/or a curing accelerator, and an inorganic filler having a thermal conductivity ratio of 20 W/m.K or more.