Substrate having thermal management coating for an insulating glass unit

• US 20040009356A1
• Filed: 05/02/2003
• Published: 01/15/2004
• Est. Priority Date: 05/03/2002
• Status: Abandoned Application

• Current Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Original Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Inventors: OʼShaughnessy, Dennis J., Medwick, Paul A., Wagner, Andrew V.
• Application Number:
  US10/428,481
• Publication Number:
  US 20040009356A1
• Time in Patent Office: Days
• US Class Current: 428/432
• 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. A coated article for use in an IG unit, comprising;

a substrate; and

a coating formed over at least a portion of the substrate, wherein the coating comprises;

a first separation layer comprising at least one dielectric layer;

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

a second separation layer comprising at least one dielectric layer deposited over the first infrared reflective layer;

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

a third separation layer comprising at least one dielectric layer deposited over the second infrared reflective layer; and

a third infrared reflective layer deposited over the third separation layer,

wherein the coating is identified for a position on the #2 or #3 surface of the IG unit after being mounted.

2. The article according to claim 1, wherein the coating is on the #3 surface.

3. The article according to claim 1, wherein the separation layers include at least one material selected from the group consisting of metal oxides, oxides of metal alloys, doped metal oxides, nitrides, oxynitrides, and mixtures thereof.

4. The article of claim 3, wherein the separation layers include at least one metal oxide selected from the group consisting of oxides of zinc, titanium, hafnium, zirconium, niobium, bismuth, indium, tin, and mixtures thereof.

5. The article of claim 1, wherein at least one of the dielectric layers comprises a plurality of dielectric films.

6. 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.

7. The article of claim 1, wherein the first separation layer comprises a zinc oxide layer deposited over a zinc stannate layer.

8. The article of claim 7, wherein the zinc oxide layer has a thickness in the range of 100 Å

to 200 Å

.

9. The article of claim 7, wherein the zinc stannate layer has a thickness in the range of 250 Å

to 400 Å

.

10. The article of claim 1, wherein the first infrared reflective layer has a thickness in the range of 100 Å

to 150 Å

.

11. The article of claim 1, wherein the second separation layer comprises 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.

12. The article of claim 11, wherein the first zinc oxide layer has a thickness in the range of 100 Å

to 150 Å

, the zinc stannate layer has a thickness in the range of 200 Å

to 500 Å

, and the second zinc oxide layer has a thickness in the range of 100 Å

to 150 Å

.

13. The article of claim 1, wherein the second infrared reflective layer has a thickness in the range of 100 Å

to 150 Å

.

14. The article of claim 1, wherein the third separation layer comprises 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.

15. The article of claim 14, wherein the zinc oxide layers each have a thickness in the range of 100 Å

to 150 Å

.

16. The article of claim 15, wherein the zinc stannate layer has a thickness in the range of 450 Å

to 550 Å

.

17. The article of claim 1, wherein the third infrared reflective layer has a thickness in the range of 140 Å

to 180 Å

.

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

19. The article of claim 18, wherein the fourth layer comprises a zinc stannate layer deposited over a zinc oxide layer.

20. The article of claim 19, wherein the zinc stannate layer has a thickness in the range of 150 Å

to 250 Å

.

21. The article of claim 19, wherein the zinc oxide layer has a thickness in the range of 80 Å

to 120 Å

.

22. The article of claim 18, including a protective overcoat deposited over the fourth separation layer and comprising titania having a thickness in the range of 20 Å

to 50 Å

.

23. An IG unit having the article of claim 1.

24. A coated article for use in an IG unit, comprising:

a substrate; and

a coating formed over at least a portion of the substrate, wherein the coating comprises;

a first separation layer comprising at least one dielectric layer;

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

a second separation layer comprising at least one dielectric layer formed over the first infrared reflective layer; and

a second infrared reflective layer formed over the second separation layer, wherein the coating is identified for a position on the #2 or #3 surface of the IG unit after being mounted, and wherein the coating provides a reference solar heat gain coefficient of less than or equal to 0.36.

25. The coated article of claim 24, wherein the coating provides a reference solar heat gain coefficient of less than or equal to 0.32.

26. The coated article of claim 24, wherein the coating is identified for a position on the #3 surface.

27. An IG unit having the article of claim 24.

28. An IG unit, comprising:

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

at least one second pane defining a #3 and a #4 surface; and

a coating formed over at least a portion of the #2 or #3 surface, wherein the coating comprises;

a first separation layer comprising at least one dielectric layer;

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

a second separation layer comprising at least one dielectric layer deposited over the first infrared reflective layer;

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

a third separation layer comprising at least one dielectric layer deposited over the second infrared reflective layer; and

a third infrared reflective layer deposited over the third separation layer.

29. The IG unit of claim 28, having a reference visible light transmittance in the range of 50% to 60%.

30. The IG unit of claim 28, having a reference transmitted a* (a*T) in the range of −

5 to −

12.

31. The IG unit of claim 28, having a reference transmitted b* (b*T) in the range of 0 to 5.

32. The IG unit of claim 28, having a reference exterior visible light reflectance (Rext vis) in the range of 5% to 15%.

33. The IG unit of claim 28, having a reference reflected exterior a* (Rexta*) in the range of −

2 to −

10.

34. The IG unit of claim 28, having a reference reflected exterior b* (Rextb*) in the range of −

0 to −

5.

35. The IG unit of claim 28, having a reference shading coefficient of less than 0.41.

36. The IG unit of claim 28, having a reference solar heat gain coefficient of less than 0.36.

37. The IG unit of claim 28, wherein the coating is formed on the #3 surface.

38. An IG unit, comprising:

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

at least one second pane defining a #3 and a #4 surface; and

a coating formed over at least a portion of the #2 or #3 surface, the coating comprising;

a first separation layer comprising at least one dielectric layer;

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

a second separation layer comprising at least one dielectric layer deposited over the first infrared reflective layer; and

a second infrared reflective layer deposited over the second separation layer, wherein the coating provides a reference solar heat gain coefficient of less than or equal to 0.36.

39. The IG unit of claim 38, wherein the coating provides a reference solar heat gain coefficient of less than or equal to 0.32.

40. The IG unit of claim 38, wherein the coating is on the #3 surface.