Thin films containing metallic copper and silver by replacement without subsequent accelerated oxidation
AssigneePPG Industries, Inc.
InventorsCharles B. Greenberg, Peter P. Harmon
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Abstract
Novel copper-silver metallic films are prepared on transparent articles by chemical replacement of silver for copper according to the method of the present invention. A transparent article is coated with a metallic copper film by a conventional method of deposition. The copper coated article is then contacted by a solution comprising a silver salt, ammonia and a complexing agent which promotes replacement but which does not accelerate the oxidation of residual metallic copper in the film. Replacement of copper by silver occurs with the film retaining its reflective metallic character.
Claims17
A method of preparing a metallic copper-silver film on a non-metallic transparent substrate comprising the steps of:
- a. sensitizing a surface of the substrate;
- b. applying a copper film to the sensitized surface;
- and
- c. contacting said copper film with a solution containing an ammoniacal silver salt and a complexing agent from the group consisting of ethylenediamine, ethylenediamine tetraacetic acid, disodium ethylenediamine tetraacetate, tetrasodium ethylenediamine tetraacetate, ethylenediamine mono-d-tartrate, sodium oxalate and ammonium hydroxide.
A method of preparing a coated glass sheet comprising the steps of:
- a. sensitizing a surface of the glass sheet;
- b. applying a copper film to the sensitized surface;
- and
- c. contacting the copper film with an aqueous solution comprising water, an ammoniacal silver salt and a complexing agent selected from the group consisting of ethylenediamine, disodium ethylenediamine tetraacetate, tetrasodium ethylenediamine tetraacetate, ethylenediamine mono-d-tartrate, sodium oxalate and ammonium hydroxide.
Dependencies are inferred from the claim text.