High light transmission, low-E sputter coated layer systems and insulated glass units made therefrom
First Claim
Patent Images
1. A glass substrate having a sputter coated layer system thereon which from the glass outwardly consists essentially of:
- a) an undercoat layer of a metal oxide or nitride having an index of refraction of 2.35-2.75;
b) a layer of metallic silver; and
c) an overcoat layer of a metal oxide or nitride having an index of refraction of 1.85-2.25;
wherein said layers are of a thickness sufficient such that said glass article has a visible transmittance (Tvis) of at least 84%, a sheet resistance (Rs) of less than or equal to 5.5 ohms/sq., and a normal emissivity (En) of less than or equal to 0.065 and wherein said layer system does not include any layer consisting essentially of a sub-stoichiometric metallic oxide located between the substrate and the layer comprised of metallic silver.
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Abstract
A high visible light transmitting, low-E sputter coating system, achieving neutral color and non-mirror-like appearance, useful in 2-pane and 3-pane IG units is achieved by an intermediate layer of silver, an undercoat of a metal oxide or nitride having an index of refraction of 2.35-2.75 and an overcoat of a metal oxide or nitride having an index of refraction of 1.85-2.25.
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Citations
27 Claims
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1. A glass substrate having a sputter coated layer system thereon which from the glass outwardly consists essentially of:
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a) an undercoat layer of a metal oxide or nitride having an index of refraction of 2.35-2.75; b) a layer of metallic silver; and c) an overcoat layer of a metal oxide or nitride having an index of refraction of 1.85-2.25; wherein said layers are of a thickness sufficient such that said glass article has a visible transmittance (Tvis) of at least 84%, a sheet resistance (Rs) of less than or equal to 5.5 ohms/sq., and a normal emissivity (En) of less than or equal to 0.065 and wherein said layer system does not include any layer consisting essentially of a sub-stoichiometric metallic oxide located between the substrate and the layer comprised of metallic silver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A glass substrate having a sputter coated layer system thereon which from the glass outwardly includes:
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a) an undercoat layer having an index of refraction of about 2.35-2.75 selected from the group consisting of TiO2 ZrO2, PbO, W2 O3, SiZrN, SiTiN, and mixtures thereof; b) a lower intermediate layer selected from an oxide or nitride of Zn, Ti, Sn, Bi, Si or mixtures thereof; c) a layer comprised of metallic silver; and d) an overcoat layer comprised of a metal oxide or nitride having an index of refraction of about 1.85-2.25; wherein said layers are of a thickness sufficient such that said glass article has a visible transmittance (Tvis) of at least about 84%, a sheet resistance (Rs) of less than or equal to about 5.5 ohms/sq. and a normal emissivity (En) of less than or equal to about 0.065 and wherein said layer system does not include any layer consisting essentially of a substoichiometric metallic oxide located between the substrate and the layer comprised of metallic silver. - View Dependent Claims (26, 27)
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Specification