| 摘要 |
This invention relates to a prepreg having a low thermal expansion coefficient in plane direction and a high rigidity, and more particularly to a prepreg comprising a glass cloth (A), and a resin composition including a cyanate ester resin (B), a non-halogen based epoxy resin (C) and an inorganic filler (D), wherein the glass cloth (A) is characterized that when the weight per 1 m 2 is W (g/m 2 ), the thickness is t (µm), the number of warp threads per inch is X (thread/inch), and the number of weft threads per inch is Y (thread/inch), the total of X and Y is 150 to 240, t is 17 to 35, and the value of W/t as the apparent density is 1.1 to 1.5, and that the volume fraction of the glass cloth (A) in the prepreg is 32 % to 42 %. |
