Patent ID: 8263216

Claim:
An epoxy resin composition for fiber reinforced composite materials comprising: [A]: an epoxy resin having a structure as represented by general formula (1): where each R 1 and R 2 independently denotes one selected from the group consisting of an aliphatic hydrocarbon group with a carbon number of 1 to 4, an alicyclic hydrocarbon group with a carbon number of 3 to 6, an aromatic hydrocarbon group with a carbon number of 6 to 10, a halogen atom, an acyl group, a trifluoromethyl group, and a nitro group; n represents an integer of 0 to 4; m represents an integer of 0 to 5; and X is one selected from the group consisting of −O—, —S—, —CO—, —C(═O)O—, and —SO 2 —; [B] a tri or more-functional epoxy resin having three or more epoxy groups per molecule; an optional epoxy resin other than [A] and [B]; and [C] a curing agent; wherein [A] accounts for 5 to 60 mas % of all epoxy resin present in the composition; and wherein [B] accounts for 40 to 80 mass % of all epoxy resin present in the composition.