| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a fiber-reinforced prepreg useful in various uses, especially in the field of space technology, a composite material produced by using the prepreg and a structural adhesive. SOLUTION: The objective curable epoxy resin composition contains (a) one or more kinds of epoxy resins having a functionality value of about >=1.8, (b) a curing agent selected from 3,3'-and 4,4'-diaminodiphenyl sulfones and their mixture, (c) about 10-40 wt.% (based on the total composition) of a thermoplastic polyimide partially soluble or at least swellable in the epoxy resin at room temperature or a temperature slightly higher than room temperature and (c) about 5-20 wt.% (based on the total composition) of a polyarylene oligomer. The composition exhibits excellent toughness compared with a similar system containing a substantial amount of polyimide in the form of discontinuous particles before curing and free from the component (c) in cured state.</p> |
