Abstract:
THE RATE OF PLATING COPPER ONTO AN ACTIVE METALLIC SURFACE OF A SUBSTRATE FROM AN ELECTROLESS COPPER PLATING SOLUTION IS ENHANCED BY ADDING TO THE PLATING SOLUTION AN IONIC COMPOUND CONSISTING OF EITHER AN ACETATE, A NITRATE, AN OXALATE, A LACTATE, A CHLORIDE, A TARTRATE, A FORMATE, A PHTHALAE, A TUNGSTATE, A MOLYBDATE, A CHLORATE, A PERCHLORATE, A CITRATE, A MOLONATE, OR MIXTURES THEREOF.
Abstract:
The method comprises depositing a thin layer of a first metal having a relatively high degree of solubility in a particular etchant over both plated areas (if a previously deposited pattern is being repaired) and unplated areas on a substrate, this first metal being catalytic to electroless deposition of a second metal to be subsequently deposited, electrolessly depositing on the first metal either an overall pattern of areas of a second metal which has a relatively low degree of solubility in the etchant or a pattern limited to parts of a previously deposited pattern that were missing or incompletely formed, and then treating the plated areas with the etchant, where desired, so that the first metal is removed where it is not covered by the second metal but the second metal is substantially unaffected.
Abstract:
A colloidal solution of a catalytic metal is prepared by admixing an acid-soluble salt of the metal, hydrochloric acid, a soluble stannous salt present in excess of the amount necessary to reduce the metal salt to colloidal metal, and a quantity of stannic chloride that has been separately aged. A substrate surface upon which metal is to be deposited is treated with the catalytic colloidal solution. The catalyzed surface is then subjected to an electroless plating bath.
Abstract:
A METHOD COMPRISING ELECTROLESSLY DEPOSITING A SEMITRANSPARENT FILM WHICH IS PREDOMINANTLY CUPROUS OXIDE OM A TRANSPARENT SUBSTRATE AND DELINEATING A PATTERN IN THE FILM BY ETCHING.
Abstract:
ELECTROLESS DEPOSITION OF COBALT FROM AN AQUEOUS ALKALINE BATH ON A PALLADIUM ACTIVATED SUBSTRATE. BATH CONTAINS HYPOPHOSPHITE AS REDUCING AGENT, LINEAR POLYPHOSPHATE ANION AND AMMONIUM HYDROXIDE AS COMPLEXING AGENTS AND SMALL CONTROLLED AMOUNTS OF NICKEL ION. COBALT WILL ALSO DEPOSIT WITHOUT IONS BEING IN BATH BY PROVIDING NICKEL ON SUBSTRATE.