High infrared reflection coatings

• US 20070082169A1
• Filed: 10/10/2006
• Published: 04/12/2007
• Est. Priority Date: 10/11/2005
• Status: Active Grant

• Current Assignee: Cardinal CG Company (Cardinal Glass Industries Incorporated)
• Original Assignee: Cardinal CG Company (Cardinal Glass Industries Incorporated)
• Inventors: Hartig, Klaus
• Granted Patent: US 7,572,511 B2
• Time in Patent Office: Days
• US Class Current: 428/69
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• CPC Class Codes: C03C 17/3618 Coatings of type glass/inorganic compound/other inorganic layers, at least one layer being metallic
• CPC Class Codes: C03C 17/3639 Multilayers containing at least two functional metal layers
• CPC Class Codes: C03C 17/3644 the metal being silver
• CPC Class Codes: C03C 17/3652 the coating stack containing at least one sacrificial layer to protect the metal from oxidation
• CPC Class Codes: C03C 17/366 Low-emissivity or solar control coatings
• CPC Class Codes: Y10T 428/231 Filled with gas other than air; or under vacuum

Abstract

The invention provides low-emissivity coatings that are highly reflective of infrared radiation. The coating includes three infrared-reflection film regions, which may each comprise silver.

Claims

1. A coated transparent pane having opposed first and second major surfaces, said coated pane being part of a multiple-pane insulating glazing unit that includes a second pane, wherein the insulating glazing unit has a between-pane space to which the second major surface of said coated pane is exposed, said second major surface bearing a low-emissivity coating that has both a sheet resistance of less than 2.5 Ω

/square and an emissivity of less than 0.03, said low-emissivity coating comprising three infrared-reflection film regions having a combined thickness of at least 425 angstroms, wherein said coated pane has a visible transmittance of greater than 0.60.

2. The coated pane of claim 1 wherein the visible transmittance of greater than 0.65.

3. The coated pane of claim 2 wherein the emissivity is less than 0.025.

4. The coated pane of claim 1 wherein the sheet resistance is less than 2.0 Ω

/square.

5. The coated pane of claim 1 wherein the combined thickness of the first, second, and third infrared-reflection film regions is greater than 450 angstroms.

6. The coated pane of claim 1 wherein the low-emissivity coating includes transparent dielectric film between said second major surface and that one of said three infrared-reflection film regions that is nearest said second major surface, and wherein between said innermost infrared-reflection film region and said second major surface the coating has less than 190 angstroms of transparent dielectric film having a refractive index of 1.7 or greater.

7. The coated pane of claim 6 wherein between said innermost infrared-reflection film region and said second major surface the coating has less than 175 angstroms of transparent dielectric film having a refractive index of 1.7 or greater.

8. The coated pane of claim 6 wherein the low-emissivity coating has a total thickness of greater than 1,800 angstroms.

9. The coated pane of claim 6 wherein the low-emissivity coating has a total thickness of greater than 1,900 angstroms.

10. The coated pane of claim 1 wherein the low-emissivity coating includes at least one nitride or oxynitride film having a thickness of less than 150 angstroms, and wherein the coating further includes at least one nitride or oxynitride film having a thickness of greater than 50 angstroms.

11. The coated pane of claim 10 wherein said nitride or oxynitride film having a thickness of greater than 50 angstroms is a spacer layer positioned between two of said infrared-reflection film regions.

12. The coated pane of claim 1 wherein the coated pane has a major dimension of at least one meter.