Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1985-08-08
1986-12-30
Smith, John D.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
427 98, 428901, 428936, 174 685, H05K 318
Patent
active
046328572
ABSTRACT:
Polyalloy catalytic coating formulations are used for preparing a metallic substrate surface to enhance subsequent plating thereover of nickel, cobalt or polyalloys including nickel or cobalt. At the same time, these catalytic formulations can be rinsed subsequent to their application onto the substrate and prior to the electroless deposition thereover. Improved products such as printed wiring boards may be made with these catalytic formulations. Such boards are prepared by depositing metal and forming circuitry patterns by using resists, etching techniques and the like which typically leave copper specks on the non-conductive board. The invention discourages electroless deposition by a nickel-containing plating bath over embedded copper specks, thereby reducing the possibility of developing bridging within the circuitry and in general undesirably increasing the conductivity of the board at locations other than on the circuitry pattern to produce printed wiring boards that are extermely resistant to developing short circuiting problems.
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Richardson Chemical Company
Smith John D.
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