MANUFACTURE OF PLASTIC FLOW SHEET FOR MULTILAYER PRINTED WIRING BOARD AND MANUFACTURE OF MULTILAYER WIRING BOARD USING THE SHEET

摘要

PROBLEM TO BE SOLVED: To provide a plastic flow sheet excellent in mold releasing property by preventing the ooze of an insulating adhesive into the hole to serve as an IVH used for the manufacture of a multilayer printed wiring board having an IVH (interstitial via hole). SOLUTION: In this sheet, a crosslinked resin layer 0.1-10μm thick is provided on at least one face of a sheet which plastically flows such as polyethylene or the like. It is to be desired that the tensile elastic modulus of such crosslinked resin layer should be 3×10<3> MPa or under at 25-100 deg.C and 3×10<2> MPa or under at 100-180 deg.C. This manufacture is one which opens a through hole in a metallic foil fitted with an adhesive where a half hardened insulating adhesive is provided on one side of a metallic foil or the insulating layer face of a laminate with its one side lined with a metallic foil, and lays the adhesive face on a circuit board prepared in advance, and lays the above-mentioned plastic flow sheet for a multilayer-wiring board which plastically flows on the metallic foil in the stacking process, and stacks and unites them by heating and pressing.