EPOXY RESIN COMPOSITION AND FIBER-REINFORCED COMPOSITE MATERIAL

PROBLEM TO BE SOLVED: To obtain an epoxy resin composition which is excellent in long-term storage stability and forms a matrix which, when cured, is excellent in adhesion to reinforcing fibers by incorporating an epoxy resin, a curing agent thereof, and a compound having at least one kind of partial structure and a group reactive with the resin or its curing agent into the same so that the resultant composition has a specified viscosity. SOLUTION: This composition contains an epoxy resin, a curing agent thereof, and a compound having at least one kind of partial structure selected from among partial structures represented by formulas I to IV and having a group reactive with the resin or its curing agent and has a viscosity at 80 deg.C of 10-1,000 cP and preferably a viscosity at 25 deg.C 10-1,000 cP. Preferably, the compound is compound in an amount of 0.5-30 pts.wt. based on 100 pts.wt. epoxy resin. Preferably, the group reactive with the epoxy resin or its curing agent is a carboxyl, phenolic hydroxyl, prim-amino, sec-amino, mercapto, or epoxy group or a double bond in conjugation with a carbonyl group.