PURPOSE: To form a plating layer excellent in adhesion by using epoxy resin, acrylonitrile-butadiene rubber, CaCO3 and an aniline-formaldehyde condensation product as the constituents of an adhesive compsn. for plating used at the time of electroless plating of heat resistant plastics with a metal.
CONSTITUTION: The top of an insulator such as heat resistant plastics is coated with an adhesive compsn. for plating obtd. by mixing 100 pts.wt. bisphenol A-diglycidyl ether type epoxy resin with 0.5-4.0 pts.wt. acrylonitrile-butadiene rubber and 50-100 pts.wt. CaCO3 or BaSO4 having ≤5μm particle diameter and ≤0.1wt.% water content and further adding an aniline-formaldehyde condensation product as an epoxy resin curing agent by an amt. required to cure the epoxy resin. The adhesive compsn. is heat-cured and the resulting cured layer is sand-blasted to expose the CaCO3. The exposed CaCO3 particles are leached out with an aq. sulfuric acid soln. and then electroless plating with a metal is carried out. A metal plating layer excellent in adhesion and having high peeling resistance is obtd. by electroless plating.
SASAKI SHINGO
KAMIMURA TOMOHISA
HAGINO TOSHIAKI
NIPPON DRAWING KK