| 摘要 |
PURPOSE:To obtain a multilayered copper-cladded laminate which has a good appearance and excellent humidity and heat resistances by using a prepreg comprised of an unwoven glass fabric impregnated with a resin for the inner- layer board side, thereby preventing the resin crack. CONSTITUTION:On the inner-layer board 11 side having inner-and outer-layer copper foils 10, 14, a prepreg 12 is placed which is comprised of an unwoven fabric 12a impregnated with a epoxy resin 12b. With this, the resin crack can be prevented, and a multilayered copper-cladded laminate can be obtained which is excellent in the appearance, and humidity and heat resistances. The deposition amount of the resin is 60-80wt.%. If less than 60%, strain cannot be absorbed, and if over 80%, the whole multilayered copper-cladded laminate becomes thick. The gel time of the prepreg is 100-160 seconds. If shorter than 100 seconds, the impregnability is bad, and if over 160 seconds, the resin portion undesirably flows out. |
