Self-cleaning glazing sheet

• US 20050252108A1
• Filed: 12/04/2002
• Published: 11/17/2005
• Est. Priority Date: 12/08/2001
• Status: Abandoned Application

• Current Assignee: Pilkington PLC
• Original Assignee: Pilkington PLC
• Inventors: Knowles, James Atherton, Sanderson, Kevin David
• Application Number:
  US10/497,886
• Publication Number:
  US 20050252108A1
• Time in Patent Office: Days
• US Class Current: 52/171.300
• CPC Class Codes: C03C 17/3417 all coatings being oxide coatings
• CPC Class Codes: C03C 17/3441 comprising carbon, a carbide or oxycarbide
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• CPC Class Codes: C03C 17/3644 the metal being silver
• 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
• CPC Class Codes: C03C 3/087 containing calcium oxide, e.g. common sheet or container glass
• CPC Class Codes: C03C 4/02 for coloured glass

Abstract

A self-cleaning glazing sheet, preferably of glass, comprises a substrate, a hydrophilic coating on a surface of the substrate, and heating means for raising the temperature of the self-cleaning glazing sheet above the temperature of a self-cleaning glazing sheet having no heating means. Preferably, the hydrophilic coating is photocatalytically active, most preferably of titanium oxide. The preferred heating means comprises a tinted glass substrate which can use incident radiant energy to raise the temperature of the substrate. Multiple glazing units and laminates comprising a self-cleaning glazing sheet and heating means are also disclosed.

Claims

1. A self-cleaning glazing sheet comprising a substrate, a hydrophilic coating on a surface of the substrate, and a heating system for raising the temperature of the substrate.

2. A self-cleaning glazing sheet as claimed in claim 1, wherein the heating system comprises a passive heating means.

3. A self-cleaning glazing sheet as claimed in claim 1, wherein the heating system comprises means for using incident radiant energy to raise the temperature of the substrate.

4. A self-cleaning glazing sheet as claimed in claim 1, wherein the heating system comprises a heat-reflecting coating on the other surface of the glazing sheet.

5. A self-cleaning glazing sheet as claimed in claim 1, wherein the heating system comprises a heat-absorbing coating on a surface of the sheet.

6. A self-cleaning glazing sheet as claimed in claim 1, wherein the substrate is a tinted glass.

7. A self-cleaning glazing sheet as claimed in claim 1, wherein the substrate has a direct solar heat absorption of 0.15 or greater.

8. A self-cleaning glazing sheet as claimed in claim 1, wherein the hydrophilic coating comprises a photocatalytically active coating.

10. A multiple glazing unit comprising a self-cleaning glazing sheet as claimed in claim 1 and a second glazing sheet in opposed orientation to the self-cleaning glazing sheet.

14. A window comprising a self-cleaning glazing sheet as claimed in claim 1.

18. A facade for a building comprising a plurality of self-cleaning glazing sheets as claimed in claim 1.

9. A self-cleaning glazing sheet comprising a tinted glass substrate having a photocatalytically active coating on a surface.

11. A multiple glazing unit comprising a self-cleaning glazing sheet, a second glazing sheet in opposed orientation to the self-cleaning glazing sheet and a heating system for raising the temperature of the self-cleaning glazing sheet

12. A multiple glazing unit as claimed in claim 11, wherein the heating system comprises a heat reflecting coating on a surface of the second glazing sheet.

21. A window comprising a multiple glazing unit as claimed in claim 11.

23. A facade for a building comprising a plurality of multiple glazing units as claimed in claim 11.

13. A laminate comprising a first ply of a self-cleaning glazing sheet, a second glass ply and a plastic interlayer and a heating system for raising the temperature of the laminate.

22. A window comprising a laminate as claimed in claim 13.

24. A facade for a building comprising a plurality of laminates as claimed in claim 13.

15. A window comprising a self-cleaning glazing sheet, the window having associated with it an air-flow reducing system arranged to reduce the flow of air over the window.

16. A window as claimed in claim 15 wherein the air-flow reducing system comprises at least one baffle.

17. A window as claimed in claim 15 wherein the air-flow reducing system comprises at least one wind deflector.

19. (canceled)

20. (canceled)