| abstract |
(57) [Problem] To provide a laminated board for electrical insulation, it is necessary to perform various mechanical processes such as punching and drilling when processing into a printed wiring board. Flame retardants, particularly inorganic filler-based flame retardants, have the problem of reducing their processability and causing cracks during processing, whitening due to delamination, and breakage of drills. SOLUTION: (a) a thermosetting resin, (b) acrylonitrile, acrylic acid, ethyl acrylate, butyl acrylate, glycidyl acrylate having a crosslinked structure and a particle shape having an average particle diameter of 2 μm or less. , Butadiene, as an essential component, a polymer containing at least one selected from the group consisting of: A prepreg characterized in that (b) is 1 part by weight or more and 10 parts by weight or less with respect to 0 parts by weight. |