Deposition of silver layer on nonconducting substrate
First Claim
1. A method to prepare an antimicrobial medical device, which medical device comprises a nonconducting material having coated on at least a portion of the surface area thereof an adhesive, thin, uniform, transparent, antimicrobial, biocompatible coating consisting essentially of silver metal in combination with one or more platinum group metal or gold metal or both platinum group metal and gold metal, which method comprises(a) activating said portion of the surface area;
- followed by(b) chemically depositing said coating by treating said activated surface with an aqueous solution of at least one salt of silver in the presence of a deposition control agent;
followed by(c) treating with a solution of a salt of said platinum group metal or gold or both,all in the absence of an electric current, said depositing being conducted for only sufficient time to result in said thin transparent coating;
followed by(d) rinsing said coating in demineralized water and drying said coating.
3 Assignments
0 Petitions
Accused Products
Abstract
Metallic silver is deposited upon the surface of a nonconducting substrate using a multi-step wet deposition process. The surface is cleaned, and then activated in an aqueous solution containing stannous tin. The silver is deposited as a colloidal material from an aqueous solution of a silver-containing salt, a reduction agent that reduces the salt to form the metallic silver, and a deposition control agent that prevents the silver from nucleating throughout the solution. After the substrate is coated, the coating is stabilized in an aqueous solution of a salt of a metal from the platinum group or gold, dissolved in dilute hydrochloric acid. The process is particularly effective for depositing uniform films of 2 to 2000 Angstroms thickness, which strongly adhere to the substrate.
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Citations
20 Claims
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1. A method to prepare an antimicrobial medical device, which medical device comprises a nonconducting material having coated on at least a portion of the surface area thereof an adhesive, thin, uniform, transparent, antimicrobial, biocompatible coating consisting essentially of silver metal in combination with one or more platinum group metal or gold metal or both platinum group metal and gold metal, which method comprises
(a) activating said portion of the surface area; - followed by
(b) chemically depositing said coating by treating said activated surface with an aqueous solution of at least one salt of silver in the presence of a deposition control agent;
followed by(c) treating with a solution of a salt of said platinum group metal or gold or both, all in the absence of an electric current, said depositing being conducted for only sufficient time to result in said thin transparent coating;
followed by(d) rinsing said coating in demineralized water and drying said coating. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- followed by
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11. A method to prepare an antimicrobial medical device, which medical device comprises a nonconducting material having coated on at least a portion of the surface area thereof an adhesive, thin, uniform, antimicrobial, biocompatible coating consisting essentially of silver metal in combination with one or more platinum group metal or gold metal or both platinum group metal and gold metal, which method comprises
(a) activating said portion of the surface area; - followed by
(b) chemically depositing said coating by treating said activated surface with an aqueous solution of at least one salt of silver in the presence of a deposition control agent;
followed by(c) treating with a solution of a salt of said platinum group metal or gold or both, all in the absence of an electric current, said depositing being conducted for only sufficient time to result in said thin coating;
followed by(d) rinsing said coating in demineralized water and drying said coating. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
- followed by
Specification