| abstract |
To provide an epoxy resin cured product that achieves high heat resistance, elastic modulus, and low colorability at the same time, and is used as a matrix resin for fiber-reinforced composite materials. The surface of the molded product does not produce white precipitates and has an excellent appearance. Oxygen resin composition. An epoxy resin composition containing an epoxy resin as a component [A] and an imidazole compound as a component [B], and satisfying the following conditions (a) to (d). (a): As a component [A], 10-40 mass parts of [A1] isocyanuric-acid type epoxy resins are contained in 100 mass parts of all epoxy resins. (b): As a component [A], 40-90 mass parts of [A2] bisphenol-type epoxy resins are contained in 100 mass parts of all epoxy resins. (c): The average epoxy equivalent of [A2] is 220-500 g/eq. (d): Content of the component [B] is an amount such that the ratio of the number of imidazoles to the number of epoxy groups in the entire epoxy resin is 0.01 to 0.06. |