Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Patent
1989-01-23
1990-08-21
Rutledge, L. Dewayne
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
428675, 428680, B32B 1508
Patent
active
049505530
ABSTRACT:
Bath surfaces of a polyimide sheet are coated with a layer of electroless nickel or cobalt which can also include a thin electroless copper layer on the Ni. or Co. This tenaciously bonded coating is subsequently treated in such a way so as to increase its permeability or porosity without substantially altering its resistive properties. The induced porosity allows water and other volatiles trapped in the dielectric polyimide sheet to be removed while the preserved electrical continuity of the metal layer is sufficient to support electrolytic copper plating which services the dual purpose of providing a copper thickness useful for the subsequent production of electronic circuitry and preventing the readsorption of water into the dielectric core by permanently sealing or coating said porous metal layer.
REFERENCES:
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patent: 4019877 (1977-04-01), Gass et al.
patent: 4394419 (1983-07-01), Konicek
patent: 4503112 (1985-03-01), Konicek
patent: 4725504 (1988-02-01), Knudsen
Knudsen Philip D.
Walsh Daniel P.
Cook Paul J.
Polyonics Corporation
Rutledge L. Dewayne
Wyszomierski George
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