초록 ▼

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-contai

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.

대표청구항 ▼

[ What is claimed is:] [1.]1. An article that resists microbial growth prepared by a method which comprises(a) activating at least a portion of the surface area of an article which article is constructed of a nonconducting material selected from the group consisting of latex, polystyrene, polyester,

[ What is claimed is:] [1.]1. An article that resists microbial growth prepared by a method which comprises(a) activating at least a portion of the surface area of an article which article is constructed of a nonconducting material selected from the group consisting of latex, polystyrene, polyester, polyvinylchloride, polyurethane, ABS polymers, polycarbonate, polyamide, polytetrafluoroethylene, polyimide and synthetic rubber; followed by(b) chemically depositing a silver layer of 2-2000 .ANG. by treating said activated surface with an aqueous solution of at least one salt of silver in the presence of a deposition control agent, said depositing being conducted for only sufficient time to result in said 2-2000 .ANG. silver layer; and(c) rinsing in demineralized water and drying.