High transmittance, low emissivity coatings for substrates
First Claim
1. A high transmittance, low emissivity coated substrate comprising a substrate having a coating on a surface providing the coated substrate with a substantially neutral color over a wide range of angles of incidence, the coating comprising:
- (a) A base coat of an anti reflective metal oxide applied to a surface of said substrate at a thickness of no more than about 275 Angstroms;
(b) A first reflective metal layer applied over said base coat;
(c) An intermediate layer of an anti reflective metal oxide applied over said first reflective metal layer;
(d) A second reflective metal layer applied over said intermediate anti-reflective layer; and
(e) An outer anti-reflective layer of a metal oxide carried over said second 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 a light. The coating employs a base coat adjacent to the transparent substrate having a thickness of no more than about 275 Angstroms 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 outer most 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.
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Citations
10 Claims
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1. A high transmittance, low emissivity coated substrate comprising a substrate having a coating on a surface 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 of an anti reflective metal oxide applied to a surface of said substrate at a thickness of no more than about 275 Angstroms; (b) A first reflective metal layer applied over said base coat; (c) An intermediate layer of an anti reflective metal oxide applied over said first reflective metal layer; (d) A second reflective metal layer applied over said intermediate anti-reflective layer; and (e) An outer anti-reflective layer of a metal oxide carried over said second reflective metal layer. - View Dependent Claims (2, 3)
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4. A high transmittance, low emissivity coated substrate comprising a substrate having a coating on a surface providing the coated substrate with a substantially neutral color, the coating comprising:
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(a) a base coat of an anti-reflective metal oxide applied to a surface of said substrate at a thickness of no more than about 275 Å
;(b) a reflective metal layer applied over said base coat; (c) an antireflective layer of a metal oxide carried over said reflective metal layer; and (d) an abrasion-resistant overcoat as the outermost layer of the coating, 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 coating. - View Dependent Claims (5, 6, 7, 8)
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9. A high transmittance, low emissivity coated substrate comprising a substrate having a coating on a surface 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 coated of an anti-reflective metal oxide applied to a surface of said substrate at a thickness of no more than about 275 Angstroms; (b) A first reflective metal layer applied over said base coat; (c) An intermediate layer of an anti-reflective metal oxide applied over said first reflective metal layer; (d) A second reflective metal layer applied over said intermediate anti-reflective layer; and (e) An outer anti-reflective layer of a metal oxide carried over said second reflective metal layer, the total thickness of the coating being no more than about 1600 Angstroms. - View Dependent Claims (10)
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Specification