Patent ID: 7601429

Claim:
A prepreg comprising a resin composition containing a naphthol aralkyl type cyanate ester resin (A) represented by the formula (1), a nonhalogen epoxy resin (B), boehmite (C) and a silicone powder (D), and a base material (E), wherein the amount of the boehmite (C) per 100 parts by weight of the total amount of the naphthol aralkyl type cyanate ester resin (A) and the nonhalogen epoxy resin (B) is 50 to 300 parts by weight and the amount of the silicone powder (D) per 100 parts by weight of the total amount of the naphthol aralkyl type cyanate ester resin (A) and the nonhalogen epoxy resin (B) is 5 to 30 parts by weight, wherein R represents a hydrogen atom or a methyl group and n is an integer of 1 to 50.