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US 5,296,302 AGranted
Abrasion-resistant overcoat for coated substrates
AssigneeCardinal IG Company
InventorsRoger O'Shaughnessy, Robert Bond
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AssigneeCardinal IG Company
InventorsRoger O'Shaughnessy, Robert Bond
Estimating the term…
The present invention provides a high transmittance, low emissivity film stack having an overcoat of an oxide of a metal chosen from the group of zinc, tin, indium, or bismuth, or an alloy including one or more of these metals, the oxide being applied in a thickness sufficiently low as to have no significant affect upon the optical properties of the coated substrate. That is, if the overcoat is lost through abrasion or chemical attack, the loss will not significantly affect the optical properties of the coating. The resulting film stack exhibits significantly enhanced durability as compared to a film stack without such an overcoat. In a preferred embodiment, a film stack of the invention includes at least one reflective metal layer, an outer, scratch-resistant metal oxide overcoat, and a metal oxide layer between the silver layer and the overcoat which is less scratch resistant than the overcoat.
A film stack applied on a substrate comprising a first metal oxide layer, at least one reflective metal layer, a second metal oxide layer disposed away from said first metal oxide layer, and an abrasion-resistant overcoat defining the outermost layer of the film stack, the overcoat being formed of an oxide of a metal selected from the group consisting of zinc, tin, indium, bismuth, and alloys thereof applied at a thickness which does not substantially affect the optical properties of said film stack.
A coated substrate comprising a substantially transparent substrate, a reflective metal layer, a first metal oxide layer disposed between the substrate and the metal layer, a second metal oxide layer applied over the metal layer at a location disposed away from the substrate, and an abrasion-resistant overcoat defining the outermost layer of the film stack, the overcoat being formed of an oxide of a metal selected from the group consisting of zinc, tin, indium, bismuth, and an alloy of zinc, tin, indium or bismuth applied at a thickness which does not substantially affect the optical properties of said coated substrate.
Dependencies are inferred from the claim text.