| 摘要 |
PURPOSE:To prepare a prepreg which hardly allows void and resin flow to occur in press molding to prepare a multi-layer board by impregnating a nonwoven fabric contg. an arom. polyamide fiber with a B-stage epoxy resin compsn. which satisfies specific requirements. CONSTITUTION:A prepreg is prepd. by impregnating a nonwoven fabric contg. an arom. polyamide fiber with a B-stage epoxy resin compsn. which satisfies the requirements: 35wt.% <= resin pick up <= 80wt.%, 70sec <= gel time <=180sec, 2500<=wt. average mol.wt. (Mw)<=4000, 500 <= number-average mol.wt. (Mn) <= 800, and 3.0 <= dispersion (Mw/Mn) <= 7.0. |
