Patent ID: 6875825

Claim:
An epoxy resin composition with a viscosity at 25° C. of no more than 1000 mPa·s, comprising 100 parts by weight of (A) at least one of a bisphenol epoxy resin (A1) and a phenol novolak epoxy resin (A2), 20 to 100 parts by weight of a bivalent epoxy resin formed from a mononuclear aromatic backbone (B1), and a phenylenediamine derivative represented by a formula (1) shown below as an aromatic amine curing agent (C), (wherein, R 1 , R 2 and R 3 represent any one of a methyl group, an ethyl group, an oxymethyl group and a thiomethyl group, and R 1 , R 2 and R 3 may be identical or different), wherein a cured product produced by curing said epoxy resin composition displays a breaking elongation of at least 5%.