| 摘要 |
PURPOSE:To provide a prepreg excellent in handleability, moldability and mechanical strength. CONSTITUTION:The objective prepreg can be obtained by impregnating reinforcing fibers with a resin composition which is prepared by mixing, as curing agent, an urea derivative and/or dicyandiamide (DICY) and 1-6 pts.wt. of a polyvinyl acetal resin with (A) 100 pts.wt. of a preliminary reaction product obtained by reaction of (1) 5-10 pts.wt. of diaminodiphenylsulfone with (2) 100 pts.wt. of an epoxy resin <=500 in epoxy equivalent, having 1.8-2.5 epoxy groups in one molecule on an average. |
