Showa Denko Materials Co., Ltd.

Junki Somekawa

Hiroshi Shimizu

Yukio Nakamura

Takeshi Saitoh

Yuji Tosaka

Ryohta Sasaki

Ryoichi Uchimura

Provided are a printed circuit board in which warps are effectively suppressed, and a semiconductor package having a semiconductor device mounted on said printed circuit board, even though circuit patterns of different amounts of metal are formed on both sides of one cured product of a prepreg. Specifically, said printed circuit board is a printed circuit board which comprises a cured product of a prepreg comprising a fiber base material and a resin composition, in which circuit patterns of different amounts of metal are formed on both sides of one cured product of the prepreg, in which said prepreg has layers on the front and back of said fiber base material, wherein said layers comprise resin compositions having different heat curing shrinkage rates, in which among these layers, the layer made of the resin composition having a smaller heat curing shrinkage rate is present on the side on which the circuit pattern with a smaller amount of metal is formed.

Growing community of inventors

Tokyo, Japan

Junki Somekawa