Corrosion-resistant silver mirror
First Claim
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1. A highly reflective and corrosion-resistant mirror comprising in combination:
- a. a polymeric substrate,b. a thin, specularly reflective layer of silver overlying said substrate and bonded thereto,c. at the surface of the silver layer that is distal to said substrate, sufficient bound mercaptide-type sulfur to bond with a substantial fraction of the available silver atoms, andd. a thin protective layer of film-forming polymer overlying said distal surface and firmly adherently bonded thereto,at least one of said substrate and said film-forming polymer being transparent to visible light so that the specular surface of the silver can be seen therethrough.
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Abstract
Durable, specularly reflective mirrors for solar reflectors or fluorescent lamp fixtures are formed by vapor-depositing silver on a polyester film and protectively covering it with a coating of transparent acrylate polymer containing a silver corrosion inhibitor such as glycol dimercaptoacetate. In a preferred embodiment a pressure-sensitive mounting adhesive is applied to the opposite face of the polyester film. Degradation of the polyester, and consequent bubbling of the adhesive, is reduced or eliminated by incorporating UV absorber in acrylate polymer that is applied as a second protective coating.
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Citations
18 Claims
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1. A highly reflective and corrosion-resistant mirror comprising in combination:
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a. a polymeric substrate, b. a thin, specularly reflective layer of silver overlying said substrate and bonded thereto, c. at the surface of the silver layer that is distal to said substrate, sufficient bound mercaptide-type sulfur to bond with a substantial fraction of the available silver atoms, and d. a thin protective layer of film-forming polymer overlying said distal surface and firmly adherently bonded thereto, at least one of said substrate and said film-forming polymer being transparent to visible light so that the specular surface of the silver can be seen therethrough. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification