| 摘要 |
PROBLEM TO BE SOLVED: To obtain a compsn. excellent in toughness and elastic modulus by incorporating an epoxy resin and a curing agent into the same and specifying the energy release rate and bending modulus of the cured compsn. each to a specified value or higher. SOLUTION: This compsn. contains 100 pts.wt. epoxy esin, a curing agent (e.g. dicyandiamide), a cure accelerator (e.g. a urea deriv. or an imidazole deriv.), 1-20 pts.wt. particulate toughening agent (e.g. core-shell rubber particles) having an average particle size of 10μm or lower, and 1-20 pts.wt. thermoplastic resin (e.g. a polyvinyl acetal resin) having hydrogen-bond-formig functional groups and gives a cured article of which the energy release rate G1c after 2-hr curing at 130 deg.C is 600 J/m<2> or higher and the bending modulus is 3.1 MPaG or higher. A high-mol.-wt. bisphenol epoxy resin having an epoxy equivalent of 450 or higher is used as the epoxy resin, and at least one epoxy resin selected from among resins of formulas I to III accounts for 10-70 wt.% of the epoxy resin. In the formulas, R<1> to R<4> , R<7> and R<8> are each H, halogen, or 1-8C alkyl.
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