Metal working – Method of mechanical manufacture – Electrical device making
Patent
1991-10-29
1994-03-01
Arbes, Carl J.
Metal working
Method of mechanical manufacture
Electrical device making
156629, 156633, 1566591, 427 96, H05K 336
Patent
active
052896307
ABSTRACT:
For attaining adhesion between copper circuitry innerlayers and pre-preg layers in a multilayer printed circuit, a conversion coating of copper oxide is provided on the metallic copper surfaces in a manner which develops an altered topography of the underlying metallic copper surfaces. Thereafter, a controlled dissolution and removal of a substantial amount of the copper oxide is effected, in a manner which does not adversely affect the already-developed topography of the underlying metallic copper, and such that the innerlayer, at the time of assembly with the pre-preg layers, has copper surfaces consisting of the topographically altered metallic copper and a relatively small amount of copper oxide thereon. Excellent bonding strengths are achieved with decreased incidence of pink ring formation as compared to conventional processes utilizing copper oxide for adhesion promotion.
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Cordani John L.
Cullen Donald P.
Decesare William J.
Donlon Edward
Ferrier Donald R.
Arbes Carl J.
MacDermid Incorporated
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