Patent ID: 6221440
Filing Date: 2001-04-24
Classification: C23C,H05K

Abstract:
Process for depositing metal coatings on polyimide surfaces, the metal coatings adhering to the polyimide surface and being resistant to aqueous alkaline solutions, the process consisting essentially of the steps of:a) deposition of a first metal coating on the polyimide surfaces by decomposition of volatile metal compounds by means of a glow discharge process in the presence of a gas mixture containing inert gases and oxygen, the inert gases and oxygen each having a respective partial pressure, the oxygen content being effective to provide a first metal coating catalytically active for subsequent electroless deposition of a second metal coating on a polyimide surface coated with the first metal coating; the ratio of partial pressure of the oxygen-containing compounds to that of the inert gases in the gas mixture being set to a value between 2:1 and 1:8;b) electroless deposition of a second pure metal coating on the first metal coating from an acidic or neutral metallizing bath, the bath having a pH.