Importance

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Abstract

One or both surfaces of a polyimide sheet are uniformly and completely textured and can be coated with a layer of electroless nickel or cobalt and a subsequent layer of electrolytically applied copper yielding an adhesiveless laminate useful in the production of electronic circuitry. The surface is textured by contacting the polyimide sheet with a one-phase solution of an amine, an alkali metal hydroxide, a water miscible alcohol and water. The copper and nickel or cobalt layers of the laminate can be strongly bonded to the textured polyimide sheet to the extent that the laminate exceeds bond strength requirements as measured by current standard peel strength tests of the Institute for Interconnecting and Packaging Electronic Circuits (IPC) for both initial and post solder float adhesion.

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First Claim