Reflective, solar control coated glass article

• US 6,733,889 B2
• Filed: 05/14/2002
• Issued: 05/11/2004
• Est. Priority Date: 05/14/2002
• Status: Expired due to Term

• Current Assignee: Pilkington North America Incorporated (Pilkington PLC)
• Original Assignee: Pilkington North America Incorporated (Pilkington PLC)
• Inventors: Remington, Michael P. Jr., Strickler, David, Varanasi, Srikanth K.
• Primary Examiner(s): STEIN, STEPHEN J
• Application Number:
  US10/145,344
• Publication Number:
  US 20030215648A1
• Time in Patent Office: 728 Days
• Field of Search: 428/426, 428/428, 428/432, 428/689, 428/697, 428/701, 428/702, 428/336
• US Class Current: 428/426
• CPC Class Codes: C03C 17/3417 all coatings being oxide coatings
• CPC Class Codes: C03C 2217/71 Photocatalytic coatings
• CPC Class Codes: Y10T 428/265 1 mil or less

Abstract

A coated glass article is formed having a glass substrate and at least first and second coatings deposited over the glass substrate. The first coating is a low emissivity layer having a first refractive index. The second coating is a reflecting layer having a second refractive index greater than the first refractive index of the first coating. The coated glass—article exhibits an Rf>15% and an emissivity less than or equal to about 0.3.

Claims

1. A coated glass substrate comprising:

a) a glass substrate;

b) a first coating deposited over the glass substrate, the first coating comprising a low emissivity layer having a thickness in the range of 1000 Å

to 6000 Å and

having a first refractive index in the visible spectrum; and

c) a second coating deposited over the first coating, the second coating comprising a visible light reflecting layer and having a second refractive index in the visible spectrum greater than the first refractive index of the first coating;

the coated glass substrate having an Rf>

15%, 30%≦

Tvis≦

70%_and an emissivity less than or equal to about 0.3.

2. The coated glass substrate of claim 1, wherein the glass substrate is comprised of a sheet of tinted glass.

3. The coated glass substrate of claim 2, wherein the SHGC is less than or equal to 0.5.

4. The coated glass substrate of claim 2, wherein the SHGC is less than or equal to 0.45.

5. The coated glass substrate of claim 1, wherein Rf>

18%.

6. The coated glass substrate of claim 1, wherein Rf>

20%.

7. The coated glass substrate of claim 1, wherein the emissivity is less than or equal to about 0.2.

8. The coated glass substrate of claim 1 wherein the low emissivity layer comprises a doped metal oxide.

9. The coated glass substrate of claim 8 wherein the doped metal oxide comprises a doped tin oxide.

10. The coated glass substrate of claim 9 wherein the doped tin oxide comprises fluorine doped tin oxide.

11. The coated glass substrate of claim 1 wherein the reflecting layer is comprised of a metal oxide.

12. The coated glass substrate of claim 11 wherein the metal oxide is comprised of an oxide of titanium.

13. The coated glass substrate of claim 12, wherein said oxide of titanium provides the coated glass article with a photocatalytic, hydrophilic surface.

14. The coated glass substrate of claim 12, wherein the coated glass article forms part of a glazing and the first and second coatings are deposited on an exterior-facing surface of the glazing.

15. The coated glass substrate of claim 1, further comprising a color suppression layer or layers deposited between the glass substrate and the first coating.

16. The coated glass substrate of claim 1, wherein the coated glass article forms one of the panes of an insulated glazing unit.

17. The coated glass substrate of claim 16, wherein the first and second coatings of the coated glass article are deposited on a surface of the coated glass article that faces another pane of the insulating glass unit.

18. The coated glass substrate of claim 1, wherein the first and second coatings are formed pyrolytically.

19. The coated glass substrate of claim 18, wherein the first and second coatings are formed by chemical vapor deposition.

20. A coated glass substrate according to claim 1, wherein the coating is such as to exhibit reflection, when viewed from the coated side, or transmission, when applied to clear float glass, colors which are each such that (a*²+b*²)^1/2 is less than 12.

21. A coated glass substrate according to claim 20, wherein the coating is such as to exhibit reflection, when viewed from the coated side, or transmission, when applied to clear float glass, colors such that (a*²+b*²)^1/2 is less than 7.

32. The coated glass substrate of claim 1, wherein the first coating has a thickness in the range of 2000 Å

to 5000 Å

.

22. A coated glass article comprising:

a) a glass substrate;

b) a first coating comprised of fluorine doped tin oxide deposited over the glass substrate, said first coating having a thickness in the range of 1000 Å

to 6000 Å and

having a first refractive index; and

c) a second coating comprised of an oxide of titanium deposited over the first coating, the second coating having a second refractive index greater than the first refractive index of the first coating;

the coated glass article having an Rf>

15%, 30%≦

Tvis≦

70%_and an emissivity less than or equal to about 0.3.

23. The coated glass article of claim 22, wherein the glass substrate is comprised of a sheet of tinted glass.

24. The coated glass article of claim 23, wherein the SHGC is less than or equal to 0.5.

25. The coated glass article of claim 23, wherein the SHGC is less than or equal to 0.45.

26. The coated glass article of claim 22, wherein Rf>

18%.

27. The coated glass article of claim 22, wherein Rf>

20%.

28. The coated glass article of claim 22, wherein the emissivity is less than or equal to about 0.2.

29. The coated glass article of claim 22, wherein said oxide of titanium provides the coated glass article with a photocatalytic, hydrophilic surface.

30. The coated glass article of claim 29 incorporated into a glazing so that the surface of the glass substrate on which the first and second coatings have been deposited is exterior-facing.

31. The coated glass article of claim 22, further comprising a color suppression layer or layers deposited between the glass substrate and the first coating.

33. The coated glass article of claim 22, wherein the first coating has a thickness in the range of 2000 Å

to 5000 Å

.