Patent ID: 8440781

Claim:
An epoxy resin composition, comprising an epoxy resin and a curing agent as essential components, wherein the curing agent is a phenol resin which has respective structural units of: a phenolic hydroxyl group-containing aromatic hydrocarbon group (P), an alkoxy group-containing condensed polycyclic aromatic hydrocarbon group (B), and a divalent hydrocarbon group (X) selected from methylene, an alkylidene group and an aromatic hydrocarbon structure-containing methylene group, and the phenol resin has, in a molecular structure, a structure in which the phenolic hydroxyl group-containing aromatic hydrocarbon group (P) and the alkoxy group-containing condensed polycyclic aromatic hydrocarbon group (B) are bonded via the divalent hydrocarbon group (X) selected from methylene, the alkylidene group and the aromatic hydrocarbon structure-containing methylene group, wherein no hydroxyl group is directly bonded to the alkoxy group-containing condensed polycyclic aromatic hydrocarbon group (B), wherein the alkoxv group-containing condensed polycyclic aromatic hydrocarbon group (B) is a structure selected from the group consisted of alkoxynaphthalene type structures represented by the following structural formulas B1 to B15, and an alkoxyanthracene structure represented by the following structural formula B16, wherein when the alkoxy group-containing condensed polycyclic aromatic hydrocarbon group (B) is located at the molecular end, a monovalent aromatic hydrocarbon group is formed.