| 摘要 |
PROBLEM TO BE SOLVED: To provide an epoxy resin composition which can provide a hardened material improved in toughness without involving deterioration of heat resistance, more specifically, an epoxy resin composition which can provide a cured material with high toughness and heat resistance, and has excellent processability in production of a prepreg, and to provide a fiber-reinforced composite material with excellent toughness and heat resistance.SOLUTION: An epoxy resin composition includes the following [A], [A'], [B] and [C]. [A] A bisphenol epoxy resin having a glass transition temperature or melting point of 50°C or higher; [A'] an epoxy resin which is in a liquid state at 25°C; [B] an epoxy resin curing agent; [C] at least one block copolymer selected from the group consisting of S-B-M, B-M and M-B-M block copolymers (wherein each block is bound to another block by a covalent bond or by an intermediate molecule bound to one block by a covalent bond and to another block by another covalent bond; block M represents a homopolymer of methyl methacrylate or a copolymer containing at least 50 wt.% of methyl methacrylate; block B is incompatible with the block M and has a glass transition temperature of 20°C or lower; and block S is incompatible with the blocks B and M and has a glass transition temperature lower than that of the block B). A prepreg obtained by impregnating a fiber base material with the epoxy resin composition, and a fiber-reinforced composite material obtained by curing the prepreg are also provided. |
