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Process for preparing improved silvered glass mirrors

  • US 4,285,992 A
  • Filed: 01/28/1980
  • Issued: 08/25/1981
  • Est. Priority Date: 01/28/1980
  • Status: Expired due to Term
First Claim
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1. In the method for preparing silvered mirrors of glass, wherein one surface of the glass is scrubbed with a slurry of an abrasive to clean the surface, a solution of a soluble compound of tin or palladium is applied to the cleaned surface to sensitize the glass, and the sensitized surface is contacted simultaneously with a solution of a soluble silver compound and one or more solutions of caustic and reducer which together with the silver solution react to precipitate a layer of silver on the sensitized surface of the glass, a layer of copper is applied over the layer of silver, and a layer of paint is applied over the layer of copper, the improvement which comprises applying a solution of a soluble compound of lanthanide rare earth ions to the cleaned surface of the glass before the silver is precipitated on the sensitized surface whereby the layer of silver has increased resistance to delamination from the surface of the glass in the presence of moisture.

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