Resin components, composite materials and hardened composite materials

Abstract

The present invention provides a resin composition comprising a vinyl ester resin (A), a monomer (B), methacrylic acid (C), and a tackifying component (D). The vinyl ester resin (A) is a vinyl ester resin having an epoxy group and an acid value of less than 1 KOH mg / g. The monomer (B) is selected from at least one monomer selected from free radical polymerizable monomers and epoxy monomers, and does not contain methacrylic acid. In the aforementioned resin composition, the content ratio of component (C) to component (D) ([methacrylic acid] / [tackifying component]) is 0.5 to 4.5 by mass.