Insulating glazing

• US 9,234,382 B2
• Filed: 03/08/2012
• Issued: 01/12/2016
• Est. Priority Date: 03/16/2011
• Status: Expired due to Fees

• Current Assignee: AGC Glass Europe SA (AGC, Inc.)
• Original Assignee: AGC Glass Europe SA (AGC, Inc.)
• Inventors: Bouesnard, Olivier, Closset, Francois
• Primary Examiner(s): Austin, Aaron
• Assistant Examiner(s): Yang, Zheren J
• Application Number:
  US14/004,780
• Publication Number:
  US 20140004283A1
• Time in Patent Office: 1,405 Days
• US Class Current: 1/1
• 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), wherein said metal oxide layers comprising a doped tin oxide layer having haze of less than 0.3%, R_a of less than 10 nm, and thickness of not less than 200 nm.

Claims

1. An insulating double glazing unit for use in a building, consisting essentially of, in the order listed:

a first glass sheet, having a face exterior to the unit and a face interior to the unit;

a soft low-emissivity assembly of layers produced by cathodic sputtering comprising an infrared-reflecting metal layer on the interior face of the first glass sheet;

a closed space;

a second glass sheet, having a face exterior to the unit and a face interior to the unit; and

a hard metal oxide layer deposited by gas pyrolysis on the exterior face of the second glass sheet;

wherein the exterior face of the first glass sheet is a glass surface of the first glass sheet and the interior face of the second glass sheet is a glass surface of the second glass sheet,

wherein a roughness Ra of the surface of the hard metal oxide layer is less than 10 nm and the roughness is obtained by polishing, and

a light transmission of the insulating double glazing unit is not less than 60% for a unit wherein each of the first and second glass sheets is 4 mm in thickness of clear glass,

wherein the metal oxide layer comprises a layer of tin oxide doped with antimony or fluorine and has a thickness of not less than 200 nm, and

wherein a haze value of the unit is less than 0.3%.

2. The glazing unit of claim 1, wherein the closed space comprises an insulating gas, the gas comprising at least 86% by volume of krypton and at most 5% of air.

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

4. The glazing unit of claim 2, wherein the insulating gas comprises at least 90% by volume of krypton and at most 1% by volume of air.

5. The glazing unit of claim 1, wherein at least one silicon oxycarbide 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.

6. 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.

7. 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.

8. The glazing unit of claim 7, wherein the soft low-emissivity assembly of layers comprises a layer comprising silver which is from 10 to 15 nm in thickness.

9. The glazing unit of claim 2, wherein the insulating gas further comprises argon.

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

11. The glazing unit of claim 1, wherein a thermal coefficient U is 0.85 or less.

12. The glazing unit of claim 1, wherein a coloration in reflection according to a CIELAB system with an illuminant D65 at 2°

, comprises as colorimetric coordinates;

−

6≦

a*≦

3, and

−

6≦

b*≦

3.

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

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

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

16. An insulating double glazing unit, consisting essentially of, in the order listed:

a first glass sheet, having a face exterior to the unit and a face interior to the unit;

a low-emissivity assembly of layers produced by sputtering comprising an infrared-reflecting metal layer on the interior face of the first glass sheet;

a closed space;

a second glass sheet, having a face exterior to the unit and a face interior to the unit; and

a metal oxide layer deposited by gas pyrolysis on the exterior face of the second glass sheet;

wherein the exterior face of the first glass sheet is a glass surface of the first glass sheet and the interior face of the second glass sheet is a glass surface of the second glass sheet,

wherein a haze value of the unit is less than 0.3%

wherein a thermal coefficient U of the unit is 0.85 or less, and

wherein a light transmission of the insulating double glazing unit is not less than 60% for a unit wherein each of the first and second glass sheets is 4 mm in thickness of clear glass,

wherein a roughness Ra of the surface of the hard metal oxide layer is less than 10 nm and the roughness is obtained by polishing, and

wherein the metal oxide layer comprises a layer of tin oxide doped with antimony or fluorine and has a thickness of not less than 200 nm.

17. The glazing unit of claim 16, wherein the closed space comprises an insulating gas, the gas comprising at least 86% by volume of krypton and at most 5% of air.

18. The glazing unit of claim 16, wherein at least one silicon oxycarbide 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.

19. The glazing unit of claim 16, 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.

20. The glazing unit of claim 16, wherein the low-emissivity assembly of layers comprises a layer comprising silver which is from 10 to 15 nm in thickness.