Resin components, composite materials and hardened composite materials

Abstract

A resin composition comprising an epoxy resin having an epoxy group, wherein the epoxy resin has an acid value of less than 1 KOH mg / g (A), at least one monomer selected from free radical polymerizable monomers and epoxy monomers (B), at least one monomer selected from benzoic acid and benzoic acid derivatives (C), and a tackifying component (D), wherein the content ratio of component (C) to component (D) in the aforementioned resin composition ([at least one monomer selected from benzoic acid and benzoic acid derivatives] / [tackifying component]) is greater than 0.5 and less than 6.0 by mass.