PRODUCTION OF METAL FOIL CLAD LAMINATED SHEET AND METAL FOIL USED THEREIN

摘要

PURPOSE:To ensure the reduction of the elasticity of a surface layer necessary for ensuring, the solder connection reliability of SMD and the peeling strength and heat resistance of a metal foil as a metal foil clad laminated sheet suitable for the substrate of an SMD corresponding printed wiring board. CONSTITUTION:An adhesive compsn. containing acrylonitrile/butadiene rubber, an epoxy resin, a phenol resin and an inorg. filler (aluminum hydroxide) as essential components is preliminarily applied to a metal foil. The compounding amt. of the inorg. filler is set to 60wt.% or less as a solid wt. basis. This metal foil is molded along with a prepreg under heating and pressure to produce a metal foil clad laminated sheet. In order to suppress the mutual blocking of the metal foils when the metal foils coated with the adhesive compsn. are superposed one upon another, 50 pts.wt. or less of modified silicone may be added to 100 pts.wt. of the adhesive compsn. when acrylic rubber is used in place of acrylonitrile/butadiene rubber, the discoloration of the laminated sheet due to heat is reduced.