Epoxy resin composition, and film, prepreg, and fiber-reinforced plastic using same

An epoxy resin composition, comprising an epoxy resin and a curing agent, and satisfying the following (1), (2), and (3):

• (1) a bending elastic modulus of a cured product of the epoxy resin composition is 3.3 GPa or higher;
• (2) a bending strain at break of the cured product of the epoxy resin composition is 9% or higher;
• and
• (3) a fiber-reinforced plastic a formed of the cured product of the epoxy resin composition and a reinforcing fiber substrate in which carbon fibers, which are continuous fibers, are evenly aligned in one direction has 90° bending strength of 95 MPa or higher,
• wherein the epoxy resin comprises:
• (A) an oxazolidone ring-containing epoxy resin, which is not a glycidylamine epoxy resin, in an amount of 30 parts by mass to 70 parts by mass;
• (B-1) a glycidylamine epoxy resin not having an oxazolidone ring in an amount of 1 part by mass to 30 parts by mass;
• (C) a bisphenol bifunctional epoxy resin having the number average molecular weight of 600 or more, which does not have oxazolidone ring and is not a glycidylamine epoxy resin, in an amount of 5 parts by mass to 30 parts by mass;
• (D) a phenoxy resin in an amount of 1 part by mass to 15 parts by mass;
• and
• (E) a curing agent in an amount of 1 part by mass to 25 parts by mass,
• each of the amounts of (A), (B-1) , (C), (D), and (E) being relative to 100 parts by mass of a total amount of all epoxy resins contained in the epoxy resin composition.