INSULATING GLAZING

• US 20140004283A1
• Filed: 03/08/2012
• Published: 01/02/2014
• Est. Priority Date: 03/16/2011
• Status: Active Grant

• Current Assignee: AGC Glass Europe SA (AGC, Inc.)
• Original Assignee: AGC Glass Europe SA (AGC, Inc.)
• Inventors: Bouesnard, Olivier, Closset, Francois
• Granted Patent: US 9,234,382 B2
• Time in Patent Office: Days
• US Class Current: 428/34
• CPC Class Codes: B32B 17/06 comprising glass as the main or only constituent of a layer, next to another layer of a specific material
• CPC Class Codes: B32B 2255/20 Inorganic coating
• CPC Class Codes: B32B 2307/304 Insulating
• CPC Class Codes: B32B 2419/00 Buildings or parts thereof
• CPC Class Codes: C03C 17/245 by deposition from the vapour phase
• CPC Class Codes: C03C 17/2453 Coating containing SnO2
• CPC Class Codes: C03C 17/3417 all coatings being oxide coatings
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• CPC Class Codes: C03C 17/366 Low-emissivity or solar control coatings
• CPC Class Codes: C03C 17/3681 the multilayer coating being used in glazing, e.g. windows or windscreens
• CPC Class Codes: C03C 2217/24 Doped oxides
• 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: E06B 3/6715 specially adapted for increased thermal insulation or for controlled passage of light E06B3/66323 takes precedence; coating of glass pains C03C17/00; devices or arrangements for controlling the intensity, colour, phase, polarisation or direction of light G02F1/00

Abstract

The invention relates to an insulating double glazing comprising a sheet of glass which has on the face (2) an assembly of layers known as low-emissivity layers, produced by sputtering and comprising at least one infrared-reflecting metallic layer, the other glass sheet comprising on the face (4) one or more metal oxide layers deposited by gas pyrolysis, the space located between the sheets being sealed and filled with insulating gas composed of krypton for at least 86% by volume and at most 5% of air, this glazing having a light transmission which is no less than 60% (for thicknesses of the clear glass sheets of 4 mm).

Claims

1. An insulating double glazing unit comprising two glass sheets, wherein:

a first glass sheet has a face 2 comprising a low-emissivity assembly of layers produced by cathodic sputtering wherein the assembly comprises an infrared-reflecting metal layer, and

a second glass sheet has a face 4 comprising a metal oxide layer deposited by gas pyrolysis,

wherein a space located between the first and second glass sheets is closed and filled with an insulating gas comprising at least 86% by volume of krypton and at most 5% of air, and the glazing unit exhibits a light transmission that is not less than 60% for a 4 mm thickness of clear glass.

2. The glazing unit of claim 1, wherein the insulating gas comprises at least 88% by volume of krypton and at most 3% by volume of air.

3. The glazing unit of claim 1, wherein the insulating gas comprises at least 90% by volume of krypton and at most 1% by volume of air.

4. The glazing unit of claim 1, having a haze less than 0.7%.

5. The glazing unit of claim 1, wherein the metal oxide layer comprises a layer of tin oxide doped with antimony or fluorine.

6. The glazing unit of claim 5, wherein at least one SiOxCy layer or an assembly of TiO₂.SiO₂ layers or an SnO₂.SiO₂ assembly is interposed between the second glass sheet and the layer of doped tin oxide.

7. The glazing unit of claim 6, wherein a thickness of the metal oxide layer is not less than 200 nm.

8. The glazing unit of claim 6, wherein a surface of the metal oxide layer has a roughness Ra of less than 10 nm.

9. The glazing unit of claim 1, wherein the metal oxide layer is such that an emissivity of a 4 mm thick clear glass sheet coated with the metal oxide layer is at most equal to 0.20.

10. The glazing unit of claim 1, wherein the low-emissivity assembly of layers is such that an emissivity of a 4 mm thick clear glass sheet coated with the assembly is at most equal to 0.02.

11. The glazing unit of claim 10, wherein the low-emissivity assembly of layers comprises a silver-based layer having a thickness of 10 to 15 nm.

12. The glazing unit of claim 1, wherein the insulating gas further comprises argon.

13. The glazing unit of claim 1, wherein the first and second glass sheets are spaced 6 to 15 mm apart.

14. The glazing unit of claim 1, wherein a coefficient U is at most equal to 0.85.

15. The glazing unit of claim 1, wherein a coloration in reflection is such that in the CIELAB system with an illuminant D65 at 2°

, colorimetric coordinates are such that;

6≦

a*≦

3, and

6≦

b*≦

3.

16. The glazing unit of claim 1, having a haze less than 0.5%.

17. The glazing unit of claim 1, wherein the metal oxide layer comprises a layer of tin oxide doped with antimony.

18. The glazing unit of claim 1, wherein the metal oxide layer comprises a layer of tin oxide doped with fluorine.

19. The glazing unit of claim 1, wherein the first and second glass sheets are spaced 8 to 12 mm apart.