A METHOD FOR ADDING LAYERS TO A PWB WHICH YIELDS HIGH LEVELS OF COPPER TO DIELECTRIC ADHESION

摘要

A permanent curable photosensitive liquid dielectric polymer composition is disclosed for making copper printed circuit boards having at least one photosensitive dielectric polymer layer containing vias and circuitry thereon wherein the polymer layer has enhanced copper to dielectric adhesion. The dielectric composition preferably comprises an acrylated epoxy and a metal adhesion effective amount of amorphous silica. Printed circuit boards made using the photodefinable dielectric polymer and a method for making the printed circuit boards are also disclosed. A twice performed permanganate etching process for texturing the dielectric surface is also preferably used to further enhance the copper to dielectric adhesion.