C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
148/16
C23C 22/63 (2006.01)
Patent
CA 1217118
ADHESION PROMOTER FOR PRINTED CIRCUITS ABSTRACT It is among the principal objects of invention to provide a composition and a method for improving the adhesion between a copper foil and a printed circuit substrate by the provision of an adhesion promoting copper oxide layer on the copper film. The provision of copper oxide layers on the surface of copper films by immersion in a chlorite-hydroxide bath as conventionally conducted presents problems of safety and reproducibility. This process is improved by employ- ing an oxidizing solution containing an alkali or alkaline earth metal chlorite at a concentration of from 100 grams per liter to complete saturation, and sodium or potas- sium hydroxide at a concentration of from 5 to 25 grams per liter. The process preferably forms an adhesion im- proving copper oxide film within commercially practical periods of time, on the order of 7 minutes or less, at practically low temperatures, on the order of from 80°F to 200°F, and preferably less than about 140°F. The solution can be sprayed by conventional spray etchers. The copper oxide films produced according to the most preferred conditions are brown in coloration and provide adhesion values according to the standard peel test of greater than about 5 pounds per inch with contact times of from about 3 to about 5 minutes.
432747
Macdermid Incorporated
Smart & Biggar
LandOfFree
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