Coating processes – Pretreatment – per se – or post-treatment – per se
Patent
1987-02-24
1989-02-21
Lawrence, Evan
Coating processes
Pretreatment, per se, or post-treatment, per se
156668, 204 30, 427306, 427307, B05D 310, C25D 556
Patent
active
048063959
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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Cook Paul J.
Lawrence Evan
Polyonics Corporation
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