Epoxy resin composition for use in a carbon-fiber-reinforced composite material, prepreg, and carbon-fiber-reinforced composite material

An epoxy resin composition for use in a carbon fiber reinforced composite material, comprising at least the following components [A] and [B], wherein the content of [A] is 20 to 80 mass % and the content of [B] is 25 to 50 mass % per 100 mass % as the total amount of the mixed epoxy resins,

• [A]:
• an epoxy resin with one or more amine type glycidyl groups at the meta position(s), wherein [A] is tetraglycidyl-3,4′-diaminodiphenylether or tetraglycidyl-3,3′-diaminodiphenylether,
• [B]:
• a bifunctional epoxy resin with two or more four- or larger-membered ring structures and one amine type glycidyl group directly bonded to one of the ring structures,
• wherein [B] contains a diphenylether, and
• the epoxy resin [B] is at least one selected from the group consisting of
• diglycidyl-p-phenoxyaniline, diglycidyl-4-(4-methylphenoxy)aniline, diglycidyl-4-(3-methlyphenoxy)aniline, diglycidyl-4-(2-methlyphenoxy)aniline, diglycidyl-4-(4-ethylphenoxy)aniline, diglycidyl-4-(3-ethylphenoxy)aniline, diglycidyl-4-(2-ethylphenoxy)aniline, diglycidyl-4-(4-propylphenoxy)aniline, diglycidyl-4-(4-tert-butylphenoxy)aniline, diglycidyl-4-(4-cyclohexylphenoxy)aniline, diglycidyl-4-(3-cyclohexylphenoxy)aniline, diglycidyl-4-(2-cyclohexylphenoxy)aniline, diglycidyl-4-(4-methoxyphenoxy)aniline, diglycidyl-4-(3-methoxyphenoxy)aniline, diglycidyl-4-(2-methoxyphenoxy)aniline, diglycidyl-4-(3-phenoxyphenoxy)aniline, diglycidyl-4-(4-phenoxyphenoxy aniline, diglycidyl-4-[4-trifluoromethyl)phenoxy]aniline, diglycidyl-4-[3-(trifluoromethyl)phenoxy]aniline, diglycidyl-4-[2-(trifluoromethyl)phenoxyl]aniline, diglycidyl-p-(2-naphthyloxyphenoxy)aniline, diglycidyl-p-(1-naphthyloxyphenoxy)aniline, diglycidyl-4-[(1,1′-biphenyl-4-yl)oxy]aniline, diglycidyl-4-(4-nitrophenoxy)aniline, diglycidyl-4-(3-nitrophenoxy)aniline diglycidyl-4-(2-nitrophenoxy)aniline, diglycidyl-4-(4-methylphenoxy)aniline diglycidyl-4-(3-methylphenoxy)aniline, diglycidyl-4-(2-methylphenoxy)aniline, diglycidyl-4-(4-ethylphenoxy)aniline, diglycidyl-4-(3-ethylphenoxy)aniline, diglycidyl-4-(4-tert-butylphenoxy)aniline, diglycidyl-4-(4-cyclohexylphenoxy)aniline, diglycidyl-p-(2-naphthyloxyphenoxy)aniline.