SHEET WITH COATING WHICH REFLECTS THERMAL RADIATION

• US 20150146286A1
• Filed: 01/16/2013
• Published: 05/28/2015
• Est. Priority Date: 03/05/2012
• Status: Active Grant

• Current Assignee: Saint-Gobain Glass France (Compagnie De Saint-Gobain)
• Original Assignee: Saint-Gobain Glass France (Compagnie De Saint-Gobain)
• Inventors: Melcher, Martin, Hagen, Jan, Ruchmann, Juliette, Vincent, Julia
• Granted Patent: US 9,541,686 B2
• Time in Patent Office: Days
• US Class Current: 359/359
• CPC Class Codes: B60J 1/00 Windows; Windscreens; Accessories therefor B60J10/00 takes precedence; air curtains instead of windows B60J9/04 ; sealing strips for windshields B60J10/70; sealing sash guides for sliding window panes B60J10/74; glass partitions inside vehicles to protect occupants against personal attack B60R21/12
• CPC Class Codes: C03C 17/3435 comprising a nitride, oxynitride, boronitride or carbonitride
• CPC Class Codes: C03C 2217/78 Coatings specially designed to be durable, e.g. scratch-resistant
• CPC Class Codes: C03C 2217/94 Transparent conductive oxide layers [TCO] being part of a multilayer coating
• CPC Class Codes: C03C 2217/948 Layers comprising indium tin oxide [ITO]
• CPC Class Codes: G02B 1/11 Anti-reflection coatings
• CPC Class Codes: G02B 5/208 for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
• CPC Class Codes: G02B 5/26 Reflecting filters G02B5/28 takes precedence

Abstract

A sheet is described. The sheet has at least one substrate and at least one coating, which reflects thermal radiation, on at least one surface of the substrate, wherein the coating on the substrate contains at least one adhesion layer, a functional layer containing at least one transparent, electrically conductive oxide, above the adhesion layer, a dielectric barrier layer, for regulating oxygen diffusion, above the functional layer, and an antireflection layer above the barrier layer, wherein the barrier layer has a thickness from 10 nm to 40 nm.

Claims

1. A pane, comprising:

at least one substrate, and

at least one thermal radiation reflecting coating on at least one surface of the substrate,

wherein the coating on the substrate includes at least;

an adhesion layer,

above the adhesion layer, a functional layer that contains at least a transparent, electrically conductive oxide,

above the functional layer, a dielectric barrier layer for regulating oxygen diffusion, and

above the barrier layer, an antireflection layer, and

wherein the barrier layer (5) has a thickness from 10 nm to 40 nm.

2. The pane according to claim 1, wherein the coating is applied on the interior-side surface of the substrate.

3. The pane according to claim 1, wherein the substrate is curved and the barrier layer preferably has a thickness from 10 nm to 30 nm, particularly preferably from 12 nm to 30 nm, most particularly preferably from 15 nm to 25 nm.

4. The pane according to claim 1, wherein the substrate is planar and the barrier layer preferably has a thickness from 12 nm to 18 nm.

5. The pane according to claim 1, wherein the substrate is bonded via at least one thermoplastic intermediate layer to a cover pane to form a composite pane and wherein the coating is arranged on the surface of the substrate facing away from the cover pane.

6. The pane according to claim 5, wherein the composite pane has visible-light transmittance of less than 10%.

7. The pane according to claim 5, wherein a sun protection coating is arranged on the surface of the substrate facing the cover pan;

on the surface of the cover pane facing the substrate or in the thermoplastic intermediate layer.

8. The pane according to claim 1, wherein the functional layer contains at least fluorine-doped tin oxide, antimony-doped tin oxide, and/or indium tin oxide and preferably has a thickness from 40 nm to 200 nm, particularly preferably from 90 nm to 150 nm.

9. The pane according to claim 1, wherein the barrier layer contains a material with a refractive index from 1.7 to 2.3, preferably at least an oxide and/or a nitride, particularly preferably silicon nitride, and most particularly preferably aluminum-doped silicon nitride, zirconium-doped silicon nitride, or boron-doped silicon nitride.

10. The pane according to claim 1, wherein the adhesion layer contains at least an oxide, preferably silicon dioxide, particularly preferably aluminum-doped silicon dioxide, zirconium-doped silicon dioxide, or boron-doped silicon dioxide and preferably has a thickness from 10 nm to 150 nm, particularly preferably from 15 nm to 50 nm.

11. The pane according to claim 1, wherein the antireflection layer contains at least an oxide, preferably an oxide with a refractive index less than or equal to 1.8, particularly preferably silicon dioxide, most particularly preferably aluminum-doped silicon dioxide, zirconium-doped silicon dioxide, or boron-doped silicon dioxide and preferably has a thickness from 20 nm to 150 nm, particularly preferably from 40 nm to 100 nm.

12. The pane according to claim 1, wherein a cover layer that contains at least an oxide, preferably at least TiO_x, ZrO₂, HfO₂, Nb₂O₅, Ta₂O₅, Cr₂O₃, WO₃, and/or CeO₂ is arranged above the coating, and that preferably has a thickness from 2 nm to 50 nm, particularly preferably from 5 nm to 20 nm.

13. The pane according to claim 1, that has an interior-side emissivity less than or equal to 25%.

14. The pane according to claim 1, wherein the substrate has transmittance in the visible spectral range greater than or equal to 70% or less than 50%.

15. A method for producing the pane with a thermal radiation reflecting coating according to claim 1, comprising:

applying, in succession, (a) an adhesion layer, (b) a functional layer that contains at least one transparent, electrically conductive oxide, (c) a dielectric barrier layer, and (d) an antireflection layer, and

(e) heating the substrate to a temperature of at least 200°

C.

16. The method according to claim 15, wherein the substrate is bent in process step at a temperature from 500°

C. to 700°

C.

17. The method according to claim 15, wherein the substrate is prestressed or partially prestressed after process step (e).

18. The method according to claim 15, wherein the specific resistance of the functional layer before process step (e) is from 500*10⁻

6 ohm*cm to 3500*10<sup>−

6</sup> ohm*cm, preferably from 1000*10<sup>−

6</sup> ohm*cm to 2000*10<sup>−

6</sup> ohm*cm, and

wherein the absorption of the coating (2) before process step (e) is preferably from 10% to 25%.

19. A method comprising:

using the pane with thermal radiation reflecting coating according to claim 1 as a pane or as a component of a pane, in particular as a component of an insulating glazing unit or a composite pane, in buildings or in means of transportation for travel on land, in the air, or on water, in particular in trains, ships, and motor vehicles, for example, as a windshield, rear window, side window, and/or roof panel.