| 摘要 |
PROBLEM TO BE SOLVED: To provide a flame-retardant resin composition having resin compounding retaining proper curability while ensuring sufficient flame retardance in a flame retarding technique using a nonhalogen flame retardant and affording mechanically, electrically and chemically proper characteristics even in products using the resin and to provide prepreg, a metal-clad laminate and a printed wiring board using the composition. SOLUTION: The flame-retardant resin composition is composed of an epoxy resin containing an organophosphorus compound represented by formula (1) (wherein, R1 to R12 denote each a hydrogen atom or a 1-20C organic group without containing a halogen element and without having reactivity) or a urea resin or a melamine resin or a phenol resin. The prepreg, metal-clad laminate and printed wiring board are obtained by using the composition. COPYRIGHT: (C)2006,JPO&NCIPI
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