INSULATING RESIN SHEET, AND CIRCUIT BOARD AND SEMICONDUCTOR PACKAGE THAT USE THE INSULATING RESIN SHEET

摘要

PROBLEM TO BE SOLVED: To provide an insulating resin sheet that has a high-level of laser workability in addition to handleability and high heat resistance.SOLUTION: In an insulating resin sheet having an insulation layer, the insulation layer has two or more epoxy groups per molecule, and contains solid epoxy resin and liquid epoxy resin. The absorption coefficient of resin composition hardened material is 300 cmor more at at least 355 nm.SELECTED DRAWING: Figure 1