Patent ID: 7985822

Claim:
A novel epoxy resin having each structure of a glycidyloxy group-containing aromatic hydrocarbon group (E) having a structure represented by the following structural formula (5) or (6) because excellent flame retardancy can be imparted to the epoxy resin cured article itself: wherein, in the formulas (5) and (6), R 5 represents a hydrogen atom or a methyl group, and o represents an integer of 1 to 3, an alkoxy group-containing aromatic hydrocarbon group (B), and a divalent aralkyl group (X), having a structure represented by the following structural formula (1): wherein R 1 represents a hydrogen atom or a methyl group, and Ar represents a phenylene group, a biphenylene group, a diphenyl ether-4,4′-diyl group, or a structure having a methyl group as a substituent on the aromatic nucleus of a phenylene group, a biphenylene group, or a diphenyl ether-4,4′-diyl group, and also having, in a molecular structure, a structure in which the glycidyloxy group-containing aromatic hydrocarbon group (E) and the alkoxy group-containing aromatic hydrocarbon group (B) are bonded to another glycidyloxy group-containing aromatic hydrocarbon group (E) or alkoxy group-containing aromatic hydrocarbon group (B) via the divalent aralkyl group (X), wherein the novel epoxy resin has a melt viscosity at 150° C. as measured by an ICI viscometer from 0.3 to 5.0 dPa·s and an epoxy group equivalent from 200 to 700 g/eq.