Transparent substrate provided with a thin-film multilayer

Patent metadata

Field	Value
Publication number	US-9494717-B2
Application number	US-201214007135-A
Country	US
Kind code	B2
Filing date	Mar 19, 2012
Priority date	Mar 24, 2011
Publication date	Nov 15, 2016
Grant date	Nov 15, 2016

Abstract

The invention relates to a transparent substrate provided with a thin-film multilayer comprising a metallic layer having infrared-reflection properties located between two, subjacent and superjacent, nonmetallic dielectric coatings, the superjacent dielectric coating comprising the sequence of thin layers deposited in the following order:
at least one high-refractive-index layer, the physical thickness of the high-refractive-index layer or the sum of the physical thicknesses of the high-refractive-index layers lying between 15 and 40 nm; and at least one low-refractive-index layer, the physical thickness of the low-refractive-index layer or the sum of the physical thicknesses of the low-refractive-index layers lying between 40 and 120 nm,

the refractive index difference between the one or more high-refractive-index layers and the one or more low-refractive-index layers lying between 0.7 and 1.2, preferably between 0.8 and 1.1.

The invention allows the solar factor of a multiple glazing unit to be increased, and an acceptable color, especially in transmission, which is in particular less green, even also less yellow, to be obtained for a multiple glazing unit.

First claim

The invention claimed is:

1. A transparent substrate (S), provided with a thin-film multilayer, the thin-film multilayer comprising only one metallic layer ( 2 ) having infrared-reflection properties, and two, subjacent ( 1 ) and superjacent ( 5 ), nonmetallic dielectric coatings, wherein the metallic layer ( 2 ) having infrared-reflection properties is located between the two, subjacent ( 1 ) and superjacent ( 5 ), nonmetallic dielectric coatings, and wherein the superjacent ( 5 ) dielectric coating comprises at least the sequence of thin layers deposited, above the metallic layer having infrared-reflection properties, in the following order:
a layer ( 7 ) made of a material having a refractive index less than or equal to 2.20 and greater than or equal to 1.80;
at least one high-refractive-index layer ( 3 ) made of a material having a refractive index greater than or equal to 2.20, wherein the physical thickness of the high-refractive-index layer ( 3 ) or the sum of the physical thicknesses of the high-refractive-index layers ( 3 ) of the superjacent ( 5 ) dielectric coating is from 15 to 40 nm; and
at least one low-refractive-index layer ( 4 ) made of a material having a refractive index less than or equal to 1.70, wherein the physical thickness of the low-refractive-index layer ( 4 ) or the sum of the physical thicknesses of the low-refractive-index layers ( 4 ) of the superjacent ( 5 ) dielectric coating is from 40 to 120 nm,
wherein the refractive index difference between the one or more high-refractive-index layers ( 3 ) and the one or more low-refractive-index layers ( 4 ) of the superjacent ( 5 ) dielectric coating is from 0.7 to 1.2, and
wherein the ratio of the physical thickness of the low-refractive-index layer ( 4 ) or the sum of the physical thicknesses of the low-refractive-index layers ( 4 ) to the physical thickness of the high-refractive-index layer ( 3 ) or the sum of the physical thicknesses of the high-refractive-index layers ( 3 ) of the superjacent ( 5 ) dielectric coating is from 2.5 to 5.0.

2. The transparent substrate of claim 1 , wherein the ratio of the total optical thickness of the superjacent ( 5 ) dielectric coating to the total optical thickness of the subjacent ( 1 ) coating is from 1.8 and 2.

3. The transparent substrate of claim 1 , wherein the metallic layer ( 2 ) having infrared-reflection properties is based on silver or a silver-containing metal alloy.

4. The transparent substrate of claim 1 , wherein the metallic layer ( 2 ) having infrared-reflection properties has a physical thickness of from 5 to 20 nm.

5. The transparent substrate of claim 1 , wherein the one or more high-refractive-index layers ( 3 ) of the superjacent ( 5 ) dielectric coating have a refractive index greater than 2.30, and are based on titanium oxide, a mixed oxide of titanium and an element selected from the group consisting of Zn, Zr, and Sn, zirconium oxide, niobium oxide, a mixed silicon zirconium nitride, or a mixed silicon, zirconium, and aluminum nitride.

6. The transparent substrate of claim 1 , wherein the physical thickness of the low-refractive-index layer ( 4 ) of the superjacent ( 5 ) dielectric coating or the sum of the physical thicknesses of the low-refractive-index layers ( 4 ) of the superjacent ( 5 ) dielectric coating is from 100 and 120 nm.

7. The transparent substrate of claim 1 , wherein the one or more low-refractive-index layers ( 3 ) of the superjacent ( 5 ) dielectric coating consist essentially of silicon oxide.

8. The transparent substrate of claim 1 , wherein the subjacent ( 1 ) dielectric coating further comprises at least one high-refractive-index layer ( 6 ) made of a material having a refractive index greater than or equal to 2.20, and
wherein the physical thickness of the high-refractive-index layer ( 6 ) or the sum of the physical thicknesses of the high-refractive-index layers ( 6 ) of the subjacent ( 1 ) dielectric coating is from 10 to 40 nm.

9. The transparent substrate of claim 8 , wherein the one or more high-refractive-index layers ( 6 ) of the subjacent ( 1 ) dielectric coating are based on titanium oxide, a mixed oxide of titanium and an element selected from the group consisting of Zn, Zr, and Sn, zirconium oxide, niobium oxide, a mixed silicon zirconium nitride, or a mixed silicon, zirconium, and aluminum nitride.

10. The transparent substrate of claim 1 , wherein the layer ( 7 ) made of a material having a refractive index less than or equal to 2.20 and greater than or equal to 1.80 is based on zinc oxide.

11. The transparent substrate of claim 1 , further comprising:
an overblocker layer ( 8 ) made of NiCr, Ti, or Nb, located between the metallic layer ( 2 ) having infrared-reflection properties and the superjacent ( 5 ) dielectric coating, and in direct contact with the metallic layer ( 2 ) having infrared-reflection properties.

12. The transparent substrate of claim 1 , wherein the subjacent ( 1 ) dielectric coating further comprises a wetting layer ( 9 ) based on zinc oxide, tin oxide, or a mixed tin zinc oxide, with which the metallic layer ( 2 ) having infrared-reflection properties is in direct contact.

13. The transparent substrate of claim 1 , wherein the subjacent ( 1 ) dielectric coating further comprises, as the first layer in direct contact with the substrate material, a layer ( 10 ) having a refractive index of between 1.70 and 2.30.

14. A multiple glazing unit, comprising a total number N of substrates, N−1 of which substrates are substrates as claimed in claim 1 , wherein N is greater than or equal to 2 and the N substrates are separated pairwise by a gas-filled cavity, and the thin-film multilayer(s) facing a gas-filled cavity.

15. The multiple glazing unit of claim 14 , wherein at least one of the substrates is a laminated glazing pane comprising two glass sheets joined together by an intermediate polymer layer.

16. The multiple glazing unit of claim 14 , wherein its external face which is configured to be turned toward the exterior of a building, comprises a self-cleaning and/or anticondensation coating and/or its external face, which is configured to be turned toward the interior of a building, comprises a low-E coating.

17. The transparent substrate of claim 1 , which is a glass substrate.

18. The transparent substrate of claim 1 , wherein the ratio of the physical thickness of the low-refractive-index layer ( 4 ) or the sum of the physical thicknesses of the low-refractive-index layers ( 4 ) to the physical thickness of the high-refractive-index layer ( 3 ) or the sum of the physical thicknesses of the high-refractive-index layers ( 3 ) of the superjacent ( 5 ) dielectric coating is from 2.5 to 4.0.

Assignees

• Reymond Vincent
• Jribi Ramzi
• Saint Gobain

Inventors

• Reymond Vincent
• Jribi Ramzi

Classifications

• C03C17/3644

  the metal being silver · CPC title

• C03C17/3681

  the multilayer coating being used in glazing, e.g. windows or windscreens · CPC title

• C03C17/36 Primary

  at least one coating being a metal · CPC title

• C03C17/3618

  Coatings of type glass/inorganic compound/other inorganic layers, at least one layer being metallic · CPC title

• G02B5/0858 Primary

  the reflecting layers comprising a single metallic layer with one or more dielectric layers · CPC title