| 摘要 |
PURPOSE:To prevent the generation of hollows, by using an inner layer plate obtained by a method wherein, after a black or brown copper oxide surface is formed, said copper oxide surface is treated by bringing it into contact with the vapor of specified cyanato compound. CONSTITUTION:For an inner layer plate wherein printed wiring network for the inner layer is formed for an intermediate layer, the following is used; a copper foil surface is chemically oxidized, a black or brown copper oxide surface is formed, and the copper oxide surface is treated by bringing it into contact with the vapor of cyanato compound having two or more cyanato radicals in a molecule, thereby obtaining the inner layer plate to be used. As the compound having two or more cyanato radicals in a molecule, the following are used; for example, 1,3- or 1,4-dicyanatobenzene, 1,3,5-tricyanatobenzene, 1,3-, 1,4-, 1,6-, 1,8-, 2,6- or 2,7-dicyanatonaphthalene and 1,3,6-tricyanatonaphthalene. Thereby, the generation of hollows can be prevented. |
