High transmittance, low emissivity coatings for substrates
First Claim
1. A high transmittance, low emissivity coated substrate comprising a transparent substrate having a coating providing the coated substrate with a substantially neutral color over a wide range of angles of incidence, the coating comprising:
- (a) a base coat adjacent to the transparent substrate at a thickness of no more than about 275 angstroms;
(b) a first reflective metal layer applied over the base coat;
(c) an intermediate layer applied over the first reflective metal layer and having a thickness that is at least three times the thickness of the base coat;
(d) a second reflective metal layer applied over the intermediate layer;
wherein the coating includes three or more reflective metal layers, and an outer metal oxide layer is applied over the outermost reflective metal layer.
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Accused Products
Abstract
The present invention provides a coating for a transparent substrate which exhibits a “neutral” color through a wide range of angles of incidence of light. The coating employs a base coat adjacent the transparent substrate having a thickness of no more than about 275 Å and may include two reflective metal layers having an intermediate layer of an anti-reflective metal oxide therebetween and an outer anti-reflective layer of metal oxide over the second reflective metal layer. If so desired, the coating of the invention may include an abrasive-resistant overcoat as its outermost layer. This overcoat is desirably formed of an abrasive-resistant metal oxide, such as zinc oxide applied at a thickness which does not significantly affect the optical properties of said coated substrate.
85 Citations
16 Claims
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1. A high transmittance, low emissivity coated substrate comprising a transparent substrate having a coating providing the coated substrate with a substantially neutral color over a wide range of angles of incidence, the coating comprising:
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(a) a base coat adjacent to the transparent substrate at a thickness of no more than about 275 angstroms; (b) a first reflective metal layer applied over the base coat; (c) an intermediate layer applied over the first reflective metal layer and having a thickness that is at least three times the thickness of the base coat; (d) a second reflective metal layer applied over the intermediate layer; wherein the coating includes three or more reflective metal layers, and an outer metal oxide layer is applied over the outermost reflective metal layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification