Title: Process for preparing crystalline silver particles having electrically conductive surfaces and product

Abstract: Processes are disclosed for preparing large crystalline silver particles having exceptionally conductive surfaces. The particles may be prepared by the reduction of a water soluble silver salt in an acidified aqueous solution by a redox reaction. Silver particles having conductive surfaces may also be prepared by treating commercial silver powder with a phenolic reducing compound such as hydroquinone dissolved in a polar solvent such as a lower alcohol. The silver powders obtained by the processes have very low electrical contact resistance and furthermore retain this low contact resistance even though the powders are exposed to air and airborne contaminants.

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Inventors: Dannelly, Clarence C. (Kingsport, TN, US)
McIntire, John M. (Kingsport, TN, US)

Application Number: 546661
Filing Date: 1975-02-03
Publication_date: 1976-02-24
Assignee: Eastman Kodak Company (Rochester, NY)
Primary Class(es): 420/501 75/370, 75/721
Other Classes:
US Patent Ref:

3201223	Aug, 1965	Cuhra et al.	75/.
3345158	Oct, 1967	Block et al.	75/108.
3390981	Jul, 1968	Hoffman	75/108.
3820979	Jun, 1974	Manassen	75/108.

Other Refs:
Primary Examiner: Ozaki, G.
Assistant Examiner:
Attorney: Heath, Jr.; William P., Reece III; Daniel B.