Patent ID: 11745485

Abstract:
An epoxy resin composition for carbon-fiber-reinforced composite material includes (A) a bisphenol F-type epoxy resin that is liquid at 25° C., (B) a polyfunctional amine-type epoxy resin, and (C) 3,3′-Diaminodiphenyl sulfone. With respect to 100 parts by mass of the entire epoxy resin in the epoxy resin composition, the content of component (A) is 40 to 60 parts by mass, the content of component (B) is 30 to 45 parts by mass, and the total content of components (A) and (B) is 85 to 100 parts by mass. The content of component (C) satisfies 1.04≤x/y≤1.35, where x is a molar number of active hydrogen atoms in the amine of component (C) and y is a molar number of all epoxy groups in the epoxy resin composition.