HARDNING POLYSICYCLOSLEFINE RESIN SOLUTION ITS USE IN MANUFACTURING OF PRINTED CIRCUIT BOARD,AND PRINTED CIRCUIT BOARD WHICH IS MANUFACTURED IN SUCH WAY

摘要

PURPOSE: To obtain a stable nonconductive substrate by immersing the substrate in polycycloolefin solution in organic solvent and laminating the dried substrate with a conductive foil so as to harden into a solvent insoluble state. CONSTITUTION: The first polymerization of a stiffener is added to a composition after finish and next, a proper substrate, a glass fiber cloth, e.g. is impregnated by about 80:20 to 30:70 by the weight of polycycloolefin (solid state) to a base. A solvent is removed by evaporation at a temperature not more than an activating temperature of the stiffener. Next, the impregnated substrate is laminated with a conductive foil and polycycloolefin crosslinks into an insoluble state to activate the stiffener to show a grass transition temperature over 90 deg.C. A circuit board obtained like this is satisfactory in a dielectric constant and dielectric tangent. Thereby a stable print circuit board showing a physical characteristic satisfactory in a low solvent swelling degree, a low linear expansion coefficient, etc., is manufactured by this.