High quality reflectance coatings

• US 8,586,215 B2
• Filed: 10/08/2012
• Issued: 11/19/2013
• 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
• Primary Examiner(s): Sample, David
• Assistant Examiner(s): COLGAN, LAUREN ROBINSON
• Application Number:
  US13/646,873
• Publication Number:
  US 20130029121A1
• Time in Patent Office: 407 Days
• Field of Search: 428/701, 428/702, 428/472.3, 428/426, 428/432, 428/688, 428/689, 428/699, 623/23.56, 623/23.57, 623/23.6, 623/23.72
• US Class Current: 428/701
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• CPC Class Codes: C03C 17/3613 Coatings of type glass/inorganic compound/metal/inorganic compound/metal/other
• CPC Class Codes: C03C 17/3626 one layer at least containing a nitride, oxynitride, boronitride or carbonitride
• CPC Class Codes: C03C 17/3639 Multilayers containing at least two functional metal layers
• CPC Class Codes: C03C 17/3642 the multilayer coating containing a metal layer
• 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: C03C 17/3681 the multilayer coating being used in glazing, e.g. windows or windscreens
• CPC Class Codes: C03C 2217/211 SnO2
• CPC Class Codes: C03C 2217/216 ZnO
• CPC Class Codes: C03C 2217/78 Coatings specially designed to be durable, e.g. scratch-resistant
• CPC Class Codes: C03C 2218/153 by plasma-enhanced cvd
• CPC Class Codes: C03C 2218/154 by sputtering
• CPC Class Codes: C03C 2218/156 by magnetron sputtering
• CPC Class Codes: C23C 14/086 of zinc, germanium, cadmium, indium, tin, thallium or bismuth
• CPC Class Codes: C23C 14/185 by cathodic sputtering
• CPC Class Codes: C23C 14/35 by application of a magnetic field, e.g. magnetron sputtering C23C14/3457 takes precedence
• CPC Class Codes: C23C 14/568 Transferring the substrates through a series of coating stations C23C14/562 takes precedence
• CPC Class Codes: E06B 2009/2417 Light path control; means to control reflection
• 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
• CPC Class Codes: E06B 9/24 : Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blindsoperating, guiding or securing devices or arrangements for roll-type closures E06B9/56; free-hanging flexible screens A47H23/00
• 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
• CPC Class Codes: Y02B 80/22 : Glazing, e.g. vaccum glazing
• CPC Class Codes: Y10T 428/24612 : Composite web or sheet
• CPC Class Codes: Y10T 428/24942 : including components having same physical characteristic in differing degree
• CPC Class Codes: Y10T 428/2495 : Thickness [relative or absolute]
• CPC Class Codes: Y10T 428/24975 : No layer or component greater than 5 mils thick
• CPC Class Codes: Y10T 428/31504 : Composite [nonstructural laminate]

Abstract

Disclosed is a coated transparent pane that is part of a multiple-pane insulating glazing unit. The unit has a between-pane space to which the second major surface of the coated pane is exposed. The second major surface bears a low-emissivity coating, which includes in sequence a first dielectric film region, a first infrared-reflection film region, a second dielectric film region, a second infrared-reflection film region, a third dielectric film region, a third infrared-reflection film region, and a fourth dielectric film region.

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, the second major surface bearing a low-emissivity coating that includes the following film regions in sequence moving away from said second major surface:

a first transparent dielectric film region, a first infrared-reflection film region, a second transparent dielectric film region, a second infrared-reflection film region, a third transparent dielectric film region, a third infrared-reflection film region, and a fourth transparent dielectric film region, the second infrared-reflection film region being thicker than the first infrared-reflection film region by at least 10 angstroms, and the third infrared-reflection film region being thicker than the second infrared-reflection film region by at least 25 angstroms, said three infrared-reflection film regions being silver-containing layers each having a thickness of between about 50 angstroms and about 300 angstroms, each of said four transparent dielectric film regions having a thickness of between about 100 angstroms and about 800 angstroms, and wherein each of said four transparent dielectric film regions comprises an uppermost zinc tin oxide layer with the remainder of the film in the transparent dielectric film region having a refractive index higher than that of the zinc tin oxide, each of said uppermost zinc tin oxide layers having a tin content of less than 0.30 on a metal-only weight basis.

2. The coated pane of claim 1 wherein each of said uppermost zinc tin oxide layers has a thickness in the range of 25 angstroms to 50 angstroms.

3. The coated pane of claim 1 wherein the low-emissivity coating has a total thickness of greater than 1,750 angstroms.

4. The coated pane of claim 3 wherein the total thickness of the low-emissivity coating is greater than 1,800 angstroms.

5. The coated pane of claim 1 wherein the coated transparent pane is glass.

6. The coated pane of claim 5 wherein the glass is soda-lime glass.

7. The coated pane of claim 1 wherein the coated transparent pane has a major dimension of at least about ½

meter.

8. The coated pane of claim 7 wherein said major dimension is at least about 1 meter.

9. The coated pane of claim 8 wherein said major dimension is between about 2 meters and about 4 meters.

10. The coated pane of claim 1 wherein the coated transparent pane has a thickness in the range of about 1-5 mm.

11. The coated pane of claim 1 wherein the coated transparent pane has a thickness in the range of about 2.3 mm to about 4.8 mm.

12. The coated pane of claim 1 wherein in each of said four transparent dielectric film regions said remainder of the film comprises titanium oxide.