Coated glass article having a solar control coating

• US 5,897,957 A
• Filed: 12/17/1996
• Issued: 04/27/1999
• Est. Priority Date: 01/11/1996
• Status: Expired due to Fees

• Current Assignee: Libbey-Owens-Ford Co. (Eaton Corporation PLC.)
• Original Assignee: Libbey-Owens-Ford Co. (Eaton Corporation PLC.)
• Inventors: Goodman, Ronald D.
• Primary Examiner(s): Speer, Timothy M.
• Application Number:
  US08/768,784
• Time in Patent Office: 861 Days
• Field of Search: 428/220, 428/432, 428/448, 428/699, 428/701, 428/702, 359/359, 359/361, 359/586, 359/589
• US Class Current: 428/432
• CPC Class Codes: C03C 17/3417 all coatings being oxide coatings
• CPC Class Codes: F21S 11/00 Non-electric lighting devices or systems using daylight roofs with sky-light opening E04D13/03; sun blinds for windows with means for redirecting light onto ceiling of a room E06B9/00; hybrid lighting devices combining artificial and natural light F21S19/00; solar heat collectors F24S; solar cells or solar cell modules H01L31/00
• CPC Class Codes: F21V 7/28 characterised by coatings
• CPC Class Codes: F21V 9/04 for filtering out infrared radiation dichroic reflectors F21V7/22; using liquid-filled chambers F21V9/12

Abstract

A glass article used for producing a coated, solar control glass for architectural windows. The coated article includes a glass substrate, a coating of a titanium oxide deposited on and adhering to the surface of the glass substrate, a coating of silicon dioxide deposited on and adhering to the surface of the coating of the titanium oxide, a second coating of titanium oxide deposited on and adhering to the surface of the coating of the silicon dioxide, and an outer coating of a conductive metal oxide deposited on and adhering to the surface of the second coating of the titanium oxide. A specific coating stack on the glass substrate provides a neutral colored article having a high visible light transmittance, a reduced solar energy transmittance, a low emittance, and a high total solar reflectance. The use of the article in architectural glazings results in a glazing that reflects solar energy in the summer and provides a low U value for the winter.

Claims

1. A coated glass article comprising:

(A) a glass substrate, having a surface;

(B) a first coating of a titanium oxide deposited on and adhering to the surface of the glass substrate;

(C) a coating of silicon dioxide deposited on and adhering to the coating of titanium oxide;

(D) a second coating of titanium oxide deposited on and adhering to the coating of silicon oxide; and

(E) a coating of a conductive metal oxide deposited on and adhering to said second coating of titanium oxide, said coated glass article having a visible light transmittance (Illuminant C) of greater than 65%, and a solar heat transmittance of less than 50%.

2. The coated glass article of claim 1, wherein said coated glass article has an emittance less than or equal to about 0.2.

3. The coated glass article of claim 1, wherein said glass substrate is a clear float glass ribbon.

4. The coated glass article of claim 1, wherein said conductive metal oxide is selected from the group consisting of indium oxide doped with tin, indium oxide doped with fluorine, tin oxide doped with fluorine, tin oxide doped with antimony, zinc oxide doped with aluminum, zinc oxide doped with fluorine, zinc oxide doped with boron, cadmium stannate, and zinc stannate.

5. The coated glass article of claim 1, wherein said titanium oxide is titanium dioxide.

6. The coated glass article of claim 1, wherein said article exhibits a neutral color in reflectance as defined in the CIELAB system having an a* value from about 1 to about -6 and a b* value of about 3 to about -5.

7. The coated glass article of claim 1, wherein said article has a U value less than 0.4

8. The coated glass article of claim 1, wherein said article has a color purity of less than 7.

9. The coated glass article of claim 1, wherein said first coating of titanium oxide is about 845 to about 940 Angstroms thick.

10. The coated glass article of claim 1, wherein said coating of silicon oxide is about 1330 to about 1470 Angstroms thick.

11. The coated glass article of claim 1, wherein said second coating of titanium oxide is about 815 to about 900 Angstroms thick.

12. The coated glass article of claim 1, wherein said coating of conductive metal oxide is about 1000 to about 3000 Angstroms thick.

13. An insulated glass unit for architectural windows, including a coated glass article as defined in claim 1.

14. The insulated glass unit of claim 13, wherein said insulated glass unit has a reflected color as defined in the CIELAB system having an a* value from about 0 to about -6 and a b* value of about 3 to about -3.

15. A coated glass article comprising:

(A) a glass substrate, having a surface;

(B) a first coating of titanium dioxide deposited on and adhering to the surface of the glass substrate, said first coating of titanium dioxide having a thickness of about 845 to about 940 Angstroms;

(c) a coating of silicon dioxide deposited on and adhering to the coating of titanium dioxide, said coating of silicon dioxide having a thickness of about 1330 to about 1470 Angstroms;

(D) a second coating of titanium dioxide deposited on and adhering to the coating of silicon oxide, said second coating of titanium dioxide having a thickness of about 815 to about 900 Angstroms; and

(E) a coating of a conductive metal oxide deposited on and adhering to said coating of titanium dioxide, said coating of conducting metal oxide having a thickness of about 1000 to about 3000 Angstroms, said coated glass article having a visible light transmittance (Illuminant C) of greater than 65%, a solar heat transmittance of less than 50%, an emittance less than or equal to about 0.2, and a U value less than 0.4.

16. The coated glass article of claim 15, wherein said glass substrate is a clear float glass ribbon.

17. The coated glass article of claim 15, wherein said conductive metal oxide is selected from the group consisting of indium oxide doped with tin and tin oxide doped with fluorine.

18. The coated glass article of claim 17, wherein said coating of indium oxide doped with tin or tin oxide doped with fluorine is about 2090 to about 2310 Angstroms thick.

19. The coated glass article of claim 18, wherein said coating of indium oxide doped with tin or tin oxide doped with fluorine is about 2200 Angstroms thick.

20. The coated glass article of claim 15, wherein said article exhibits a neutral color in reflectance as defined in the CIELAB system having an a* value from to about 1 to about -6 and a b* value of about 3 to about -5.

21. The coated glass article of claim 15, wherein said article has a color purity of less than 7.

22. The coated glass article of claim 15, wherein said first coating of titanium dioxide is about 874 to about 910 Angstroms thick.

23. The coated glass article of claim 22, wherein said first coating of titanium dioxide is about 892 Angstroms thick.

24. The coated glass article of claim 15, wherein said coating of silicon dioxide is about 1372 to about 1428 Angstroms thick.

25. The coated glass article of claim 24, wherein said coating of silicon dioxide is about 1400 Angstroms thick.

26. The coated glass article of claim 15, wherein said second coating of titanium dioxide is about 839 to about 874 Angstroms thick.

27. The coated glass article of claim 26, wherein said second coating of titanium dioxide is about 857 Angstroms thick.

28. An insulated glass unit for architectural windows, including a coated glass article as defined in claim 15.

29. The insulated glass unit of claim 28, wherein said insulated glass unit has a reflected color as defined in the CIELAB system having an a* value from about 0 to about -6 and a b* value of about 3 to about -3.

30. A coated glass article comprising:

(A) a float glass ribbon, having a surface;

(B) a first coating of titanium dioxide deposited on and adhering to the surface of the float glass ribbon, said first coating of titanium dioxide having a thickness of about 845 to about 940 Angstroms;

(C) a coating of silicon dioxide deposited on and adhering to the coating of titanium dioxide, said coating of silicon dioxide having a thickness of about 1330 to about 1470 Angstroms;

(D) a second coating of titanium dioxide deposited on and adhering to the coating of silicon oxide, said second coating of titanium dioxide having a thickness of about 815 to about 900 Angstroms; and

(E) a coating of tin oxide doped with fluorine deposited on and adhering to said coating of titanium dioxide, said coating of fluorine doped tin oxide having a thickness of about 2090 to about 2310 Angstroms, said coated glass article having a visible light transmittance (Illuminant C) of greater than 65%, a solar heat transmittance of less than 50%, an emittance of 0.2, and a U value less than 0.4.

31. The coated glass article of claim 30, wherein said article exhibits a neutral color in reflectance as defined in the CIELAB system having an a* value from about 1 to about -6 and a b* value of about 3 to about -5.

32. The coated glass article of claim 30, wherein said article has a color purity of less than 7.

33. The coated glass article of claim 30, wherein said first coating of titanium dioxide is about 874 to about 910 Angstroms thick, said coating of silicon dioxide is about 1372 to about 1428 Angstroms thick, said second coating of titanium dioxide is about 839 to about 874 Angstroms thick, and said coating of tin oxide doped with fluorine is about 2156 to about 2244 Angstroms thick.

34. An insulated glass unit for architectural windows, including a coated glass article as defined in claim 30.

35. The insulated glass unit of claim 34, wherein said insulated glass unit has a reflected color as defined in the CIELAB system having an a* value of about -1.4 and a b* value of about -0.2.