Coated glass

• US 20070111012A1
• Filed: 06/03/2004
• Published: 05/17/2007
• Est. Priority Date: 06/06/2003
• Status: Active Grant

• Current Assignee: Pilkington Group Limited (Nippon Sheet Glass Company Limited)
• Original Assignee: Pilkington Group Limited (Nippon Sheet Glass Company Limited)
• Inventors: Paul, Thomas, Sanderson, Kevin, Rimmer, David
• Granted Patent: US 7,687,148 B2
• 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 17/366 Low-emissivity or solar control coatings
• CPC Class Codes: C03C 2217/71 Photocatalytic coatings
• CPC Class Codes: C03C 2217/75 Hydrophilic and oleophilic coatings
• CPC Class Codes: C03C 2218/365 Coating different sides of a glass substrate

Abstract

Dual coated glass sheets comprise a photocatalytically active self cleaning coating on one surface and heat reflecting coating on the second surface selected so that its single surface reflectivity is either at least three times or less than one third that of the self cleaning coating. The selection of the heat reflecting coating provides a sheet having an improved appearance. Such dual coated sheets combine self cleaning properties with solar control or low emissivity properties and are useful as building glasses.

Claims

1-16. -16. (canceled)

17. A dual coated self cleaning glazing sheet which comprises on a first surface thereof a photocatalytically active hydrophilic coating and on the second surface thereof a functional coating said functional coating having a single surface reflectivity of less than one third or more than three times that of the photocatalytically active hydrophilic coating.

18. A dual coated glazing sheet according to claim 17, wherein the functional coating is a heat reflecting coating.

19. A glazing sheet according to claim 17, wherein the photocatalytically active hydrophilic coating has a single surface reflectivity of less than 15%.

20. A glazing sheet according to claim 19, wherein the photocatalytically active hydrophilic coating has a single surface reflectivity of less than 10%.

21. A glazing sheet according to claim 17, wherein the photocatalytically active hydrophilic coating comprises titanium dioxide.

22. A glazing sheet according to claim 21, wherein the titanium dioxide coating is from 10 to 20 nm thick.

23. The glazing sheet according to claim 17, wherein the photocatalytically active hydrophilic coating comprises an underlayer which is an alkali metal ion blocking layer.

24. The glazing sheet according to claim 23, wherein the underlayer comprises a silicon oxide.

25. The glazing sheet according to either of claim 23, wherein the underlayer is from 25 to 40 nm thick.

26. The glazing sheet according to claim 17, wherein the functional coating has a single surface reflectivity of less than 5%.

27. The glazing sheet according to claim 26, wherein the functional coating has a single surface reflectivity of less than 3%.

28. The glazing sheet according to claim 17, wherein the functional coating has a reflectivity of greater than 30%.

29. A glass laminate comprising at least two glass panes separated by a bonding interlayer disposed between them wherein one of the glass panes comprises a dual coated sheet according to claim 17.

30. A multiple glazing unit comprising at least two glass panes spaced apart by a perimeter seal wherein at least one of the glass panes comprises a dual coated glass according to claim 17.

31. A glass laminate comprising at least two glass panes separated by a bonding interlayer wherein one of said sheets has a photocatalytically active coating on an exterior surface thereof and a second glass pane having a functional coating upon at least one surface thereof wherein the functional coating has a single surface reflectivity which is less than one third or more than three times that of the photocatalytically active coating.

32. A multiple glazing unit comprising at least two glass panes spaced apart by a perimeter seal wherein one of the panes has a photocatalytically active coating on an exterior surface thereof and a second pane has a functional coating upon at least one surface wherein the functional coating has a single surface reflectivity which is less than one third or more then three times that of the photocatalytic coating.