Provided is a resin composition that is capable of producing a cured product having excellent environmental suitability, high strength, and excellent flame retardancy, and that is suitably usable as a matrix resin for fiber-reinforced plastics. A resin composition contains (A) an epoxy resin, (B) a cyanate resin, (C) an aromatic amine curing agent that is liquid at 25° C., and (D) a phosphorus-containing compound represented by formula (1). Preferably, in formula (1), R
1
and R
2
each independently represent an alkyl group or an aryl group, and X and Y are an oxygen atom.
提供的是一种
树脂组成物,能够产生具有优良环境适应性、高强度和优异阻燃性的固化产品,适合用作纤维增强塑料的基体
树脂。该
树脂组成物包含(A)环氧
树脂,(B)
氰酸酯
树脂,(C)在25℃下为液态的芳香胺固化剂,以及(D)由公式(1)表示的
含磷化合物。在公式(1)中,最好是R1和R2各自独立地表示烷基或芳基,而X和Y则是氧原子。