Patent ID: 7585558

Claim:
A carbon fiber-reinforced resin composite material produced by curing a composition comprising (1) a resin mixture comprising: (A) an epoxy group-containing vinyl ester resin having, in the molecule, 0.8 to 0.3 equivalent of epoxy group and 0.2 to 0.7 equivalent of an ethylenically unsaturated group, (B) a radical-polymerizable monomer, and (C) a curing agent comprising an organic peroxide curing agent and a curing agent for epoxy resin, and (2) (D) a carbon fiber in form strand impregnated with a sizing agent for bundling of carbon fiber filaments in an amount of 0.3 to 5% by mass based on the carbon fiber (D), wherein the sizing agent contains (d) a vinyl ester resin, having substantially no epoxy group, in an amount of 30% by mass of more, which is obtained by an addition reaction of an epoxy resin and an ethylenically unsaturated carboxylic acid, wherein the carbon fiber-reinforced resin composite material has a bending strength of 900 Mpa or higher.