Coated tinted glass article and method of making same

• US 9,957,194 B2
• Filed: 03/15/2012
• Issued: 05/01/2018
• Est. Priority Date: 03/30/2011
• Status: Active Grant

• Current Assignee: Pilkington Group Limited
• Original Assignee: Pilkington Group Limited
• Inventors: Soubeyrand, Michel J., Varanasi, Srikanth
• Primary Examiner(s): Handville, Brian
• Application Number:
  US13/261,737
• Publication Number:
  US 20140037925A1
• Time in Patent Office: 2,238 Days
• Field of Search: 428216, 428336, 428426, 428432, 65 602
• CPC Class Codes: C03C 17/002 for flat glass, e.g. float glass
• CPC Class Codes: C03C 17/3417 all coatings being oxide coatings
• CPC Class Codes: C03C 2218/1525 by atmospheric CVD
• CPC Class Codes: F24S 70/225 for spectrally selective absorption
• CPC Class Codes: Y10T 428/24975 No layer or component greater than 5 mils thick
• CPC Class Codes: Y10T 428/265 1 mil or less

Abstract

The invention relates to a multi-layer pyrolytic coating stack deposited on a tinted glass substrate to form a coated glass article exhibiting a desired combination of emissivity, visible light transmittance and solar heat gain coefficient. A method for depositing the multi-layer coating stack on the tinted glass substrate is also part of the invention.

Claims

1. A coated glass article comprising:

a tinted glass substrate;

a fluorine doped tin oxide coating deposited over the tinted glass substrate; and

an overcoat consisting of silica deposited over and in contact with the fluorine doped tin oxide coating, the overcoat having a thickness between 30 nm and 50 nm;

the coated glass article exhibiting a visible light transmittance >

70% as measured by Illuminant A (10 degree observer), a solar heat gain coefficient ≤

0.55 and a hemispherical emissivity <

0.4.

2. The coated glass article defined in claim 1, wherein the tinted glass is green, blue, or blue-green in color, falling within the CIELAB color coordinate range of a*=−

10.5 to −

4 and b*=−

6.5 to +4, as measured by Illuminant C.

3. The coated glass article defined in claim 2, wherein the tinted glass falls within the CIELAB color coordinate range a*=−

8.8 to −

5.5 and

b*=−

3 to +2, as measured by Illuminant C.

4. The coated glass article defined in claim 1, wherein a color suppression coating is deposited between the tinted glass substrate and the fluorine doped tin oxide coating.

5. The coated glass article defined in claim 4, wherein the color suppression coating comprises:

an undoped tin oxide coating having a thickness of 20 nm-30 nm deposited over the tinted glass substrate and a silica coating having a thickness of 20 nm-30 nm deposited over the undoped tin oxide coating.

6. The coated glass article defined in claim 4, wherein the fluorine doped tin oxide coating has a thickness less than 350 nm.

7. The coated glass article defined in claim 6, wherein the film side reflectance of the coated glass article is <

7% as measured by Illuminant A (10 degree observer).

14. The coated glass article defined in claim 1, wherein the tinted glass substrate has a thickness of at least 5 mm.

15. The coated glass article defined in claim 1, wherein the tinted glass substrate has a thickness of 5 to 6 mm.

8. A method of depositing a multi-layer coating stack on a substrate to form a coated glass article comprising:

providing a moving, heated glass substrate supported on a bath of molten metal in a glass manufacturing process, at substantially atmospheric pressure, wherein the glass is a tinted glass;

depositing a fluorine doped tin oxide coating comprising a tin compound and a dopant over the heated glass substrate; and

depositing an overcoat consisting of silica over and in contact with the fluorine doped tin oxide coating, wherein the overcoat is deposited at a thickness between 30 nm and 50 nm, and wherein the coated tinted substrate exhibits a visible light transmittance >

70% as measured by Illuminant A (10 degree observer), a solar heat gain coefficient ≤

0.55 and a hemispherical emissivity <

0.4.

9. The method defined in claim 8, wherein a color suppression coating comprising one or more of a tin compound and a silica compound is deposited over the tinted glass substrate and prior to the deposition of the fluorine doped tin oxide coating.

10. The method defined in claim 8, wherein the tinted glass is green, blue, or blue-green in color, falling within the CIELAB color coordinate range of a*=−

10.5 to −

4 and b*=−

6.5 to =4, as measured by Illuminant C.

11. The method defined in claim 10, wherein the tinted glass falls within the CIELAB color coordinate range of a*=−

8.8 to −

5.5 and b*=−

3 to +2 as measured by Illuminant C.

12. The method define in claim 9, wherein the color suppression coating comprises:

an undoped tin oxide coating having a thickness of 20 nm-30 nm deposited over the tinted glass substrate and a silica coating having a thickness of 20 nm-30 nm deposited over the undoped tin oxide coating.

13. The method defined in claim 8, wherein the fluorine doped tin oxide coating is deposited at a thickness less than 350 nm.