Substrate having thermal management coating for an insulating glass unit

• US 7,910,229 B2
• Filed: 09/11/2006
• Issued: 03/22/2011
• Est. Priority Date: 05/03/2002
• Status: Expired due to Term

• Current Assignee: Vitro Flat Glass LLC (Compagnie De Saint-Gobain)
• Original Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Inventors: O'Shaughnessy, Dennis J., Medwick, Paul A., Wagner, Andrew V.
• Primary Examiner(s): McNeil; Jennifer C
• Assistant Examiner(s): ROBINSON, LAUREN E
• Application Number:
  US11/519,188
• Publication Number:
  US 20070116967A1
• Time in Patent Office: 1,653 Days
• Field of Search: 428/428, 428/432, 428/469, 428/701, 428/702, 428/699, 428/698, 428/689, 204/192.1, 204/192.26, 427/162, 427/164, 427/165
• 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 17/3618 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 17/366 Low-emissivity or solar control coatings
• CPC Class Codes: C03C 17/3681 the multilayer coating being used in glazing, e.g. windows or windscreens

Abstract

A coated article is provided for use in an IG unit. The article includes a substrate and a coating formed over at least a portion of the substrate. The coating includes a plurality of separation layers having one or more dielectric layers and a plurality of infrared reflective layers. The coating can be positioned on the #2 or #3 surface of the IG unit and can provide a reference solar heat gain coefficient of less than or equal to 0.35.

Claims

1. An insulating glass unit, comprising:

a first pane defining a #1 surface and a #2 surface;

at least one second pane comprising clear glass and defining a #3 surface and a #4 surface, with the #2 surface facing the #3 surface; and

a coating formed over at least a portion of the #3 surface;

wherein the coating comprises

a first separation layer comprising a zinc oxide layer over a zinc stannate layer, wherein the zinc oxide layer has a thickness in the range of 75 Å

to 150 Å

;

a first infrared reflective layer deposited over the first separation layer;

a second separation layer comprising a first zinc oxide layer having a thickness in the range of 75 Å

to 150 Å

, a zinc stannate layer deposited over the first zinc oxide layer, and a second zinc oxide layer having a thickness in the range of 75 Å

to 150 Å

deposited over the zinc stannate layer;

a second infrared reflective layer deposited over the second separation layer;

a third separation layer comprising a first zinc oxide layer having a thickness in the range of 75 Å

to 150 Å

, a zinc stannate layer deposited over the first zinc oxide layer, and a second zinc oxide layer having a thickness in the range of 75 Å

to 150 Å

deposited over the zinc stannate layer; and

a third infrared reflective layer deposited over the third separation layer; and

wherein the coating provides the unit with a reference solar heat gain coefficient of less than or equal to 0.36.

2. The unit of claim 1, wherein the coating provides a reference heat gain coefficient of less than or equal to 0.32.

3. The unit of claim 1, having a reference visible light transmittance in the range of 50% to 60%.

4. The unit of claim 1, having a reference transmitted a* (a*T) in the range of −

5 to −

12.

5. The unit of claim 1, having a reference transmitted b* (b*T) in the range of 0 to 5.

6. The unit of claim 1, having a reference exterior visible light reflectance (Rext vis) in the range of 5% to 15%.

7. The IG unit of claim 1, having a reference reflected exterior a* (Rexta*) in the range of −

2 to −

10.

8. The IG unit of claim 1, having a reference reflected exterior b* (Rextb*) in the range of −

0 to −

5.

9. The IG unit of claim 1, having a reference shading coefficient of less than 0.41.

10. The unit of claim 1, wherein the first pane comprises tinted or colored glass.

11. The article of claim 1, wherein the infrared reflective layers include at least one metal selected from the group consisting of gold, copper, silver, or mixtures, alloys, or combinations thereof.

12. The article of claim 1, including a fourth separation layer comprising at least one dielectric layer deposited over the third infrared reflective layer.

13. The article of claim 12, wherein the fourth layer comprises a zinc stannate layer deposited over a zinc oxide layer.

14. An insulating glass unit, comprising:

a first pane defining a #1 surface and a #2 surface, the first pane comprising tinted or colored glass;

at least one second pane comprising clear glass and defining a #3 surface and a #4 surface, with the #2 surface facing the #3 surface; and

a coating formed over at least a portion of the #3 surface, wherein the coating comprises;

a first separation layer comprising a zinc oxide layer deposited over a zinc stannate layer, wherein the zinc oxide layer has a thickness in the range of 100 Å

to 150 Å

;

a first infrared reflective layer deposited over the first separation layer, wherein the first infrared reflective layer is silver;

a second separation layer comprising a first zinc oxide layer, a zinc stannate layer deposited over the first zinc oxide layer, and a second zinc oxide layer deposited over the zinc stannate layer, wherein the zinc oxide layers have thicknesses in the range of 100 Å

to 120 Å

;

a second infrared reflective layer deposited over the second separation layer, wherein the second infrared reflective layer is silver;

a third separation layer comprising a first zinc oxide layer, a zinc stannate layer deposited over the first zinc oxide layer, and a second zinc oxide layer deposited over the zinc stannate layer, wherein the zinc oxide layers have thicknesses in the range of 100 Å

to 120 Å

;

a third infrared reflective layer deposited over the third separation layer, wherein the third infrared reflective layer is silver; and

a fourth separation layer comprising a zinc stannate layer deposited over a zinc oxide layer;

wherein the coating provides the unit with a reference solar heat gain coefficient of less than or equal to 0.36, a reference visible light transmittance in the range of 50% to 60%, a reference transmitted a* (a*T) in the range of −

5 to −

12, a reference transmitted b* (b*T) in the range of 0 to 5, a reference exterior visible light reflectance (Rext vis) in the range of 5% to 15%, a reference reflected exterior a* (Rexta*) in the range of −

2 to −

10, a reference reflected exterior b* (Rextb*) in the range of −

0 to −

5, and a reference shading coefficient of less than 0.41.