Epoxy resin composition, prepreg, fiber reinforced composite material, and production methods therefor

An epoxy resin composition comprising:

• an epoxy resin [A] represented by the following Chemical Formula (1),
• wherein R1 to R4 each independently represent one selected from a group consisting of a hydrogen atom, an aliphatic hydrocarbon group, an alicyclic hydrocarbon group, and a halogen atom and X represents one selected from —CH2—, —O—, —S—, —CO—, —C(═O)O—, —O—C(═O)—, —NHCO—, —CONH—, and —SO2—;
• and
• a curing agent [B] which is a curing agent composed of an aromatic polyamine, wherein the aromatic polyamine has a substituent of any of an aliphatic substituent, an aromatic substituent, and a halogen atom in at least one ortho position with respect to an amino group.

An epoxy resin composition comprising:

• an epoxy resin [A]
• represented by the following Chemical Formula (1),
• wherein R1 to R4 each independently represent one selected from a group consisting of a hydrogen atom, an aliphatic hydrocarbon group, an alicyclic hydrocarbon group, and a halogen atom and X represents one selected from —CH2—, —O—, —S—, —CO—, —C(═O)O—, —O—C(═O)—, —NHCO—, —CONH—, and —SO2—;
• and
• an epoxy resin [C] which is an aromatic epoxy resin having a glycidyl ether group, wherein the aromatic epoxy resin has a ratio of the number of glycidyl ethers/the number of aromatic rings of 2 or more.

An epoxy resin composition comprising:

• an epoxy resin [A]
• represented by the following Chemical Formula (1),
• wherein R1 to R4 each independently represent one selected from a group consisting of a hydrogen atom, an aliphatic hydrocarbon group, an alicyclic hydrocarbon group, and a halogen atom and X represents one selected from —CH2—, —O—, —S—, —CO—, —C(═O)O—, —O—C(═O)—, —NHCO—, —CONH—, and —SO2—;
• and
• an epoxy resin [D] having an epoxy equivalent weight of 110 g/eq or less.