Solar control coating

• US 20030180547A1
• Filed: 02/11/2003
• Published: 09/25/2003
• Est. Priority Date: 02/11/2002
• Status: Abandoned Application

• Current Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Original Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Inventors: Thiel, James P., Finley, James J., Buhay, Harry
• Application Number:
  US10/364,089
• Publication Number:
  US 20030180547A1
• Time in Patent Office: Days
• US Class Current: 428/434
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: B32B 17/10174 Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
• CPC Class Codes: B32B 17/10761 containing vinyl acetal
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• CPC Class Codes: C03C 17/3613 Coatings of type glass/inorganic compound/metal/inorganic compound/metal/other
• CPC Class Codes: C03C 17/3618 Coatings of type glass/inorganic compound/other inorganic layers, at least one layer being metallic
• CPC Class Codes: C03C 17/3639 Multilayers containing at least two functional metal layers
• CPC Class Codes: C03C 17/366 Low-emissivity or solar control coatings
• CPC Class Codes: C03C 2217/78 Coatings specially designed to be durable, e.g. scratch-resistant
• CPC Class Codes: G02B 1/115 Multilayers
• CPC Class Codes: G02B 1/116 including electrically conducting layers
• CPC Class Codes: G02B 5/282 reflecting for infrared and transparent for visible light, e.g. heat reflectors, laser protection

Abstract

A coating is provided having a first anti-reflective layer; a first infrared reflective film deposited over the first anti-reflective layer; a second anti-reflective layer deposited over the first infrared reflective film; a second infrared reflective film deposited over the second anti-reflective layer; a third anti-reflective layer deposited over the second infrared reflective film; and a third infrared reflective film deposited over the third anti-reflective layer.

Claims

1. A coating, comprising:

a first anti-reflective layer;

a first infrared reflective film deposited over the first anti-reflective layer;

a second anti-reflective layer deposited over the first infrared reflective film;

a second infrared reflective film deposited over the second anti-reflective layer;

a third anti-reflective layer deposited over the second infrared reflective film; and

a third infrared reflective film deposited over the third anti-reflective layer.

2. The coating of claim 1, wherein the anti-reflective layers include at least one material selected from the group consisting of metal oxides, oxides of metal alloys, doped metal oxides, nitrides, oxynitrides, and mixtures thereof.

3. The coating of claim 2, wherein the anti-reflective layers include at least one metal oxide selected from the group consisting of oxides of zinc, titanium, hafnium, zirconium, niobium, bismuth, indium, tin, and mixtures thereof.

4. The coating of claim 2, wherein the oxides of metal alloys are selected from the group consisting of zinc stannate and indium-tin alloys.

5. The coating of claim 1, wherein at least one of the anti-reflective layers comprises a plurality of anti-reflective films.

6. The coating of claim 1, wherein the infrared reflective films include a metal selected from the group consisting of gold, copper, silver, aluminum, or mixtures, alloys, or combinations thereof.

7. The coating of claim 1, wherein the first anti-reflective layer has a thickness in the range of 300 Å

to 350 Å

such as less than 300 Å

such as less than 280 Å

.

8. The coating of claim 1, wherein the first anti-reflective layer comprises a zinc oxide film deposited over a zinc stannate film.

9. The coating of claim 8, wherein the zinc oxide film has a thickness in the range of 50 Å

to 200 Å

for example 50 Å

to 150 Å

.

10. The coating of claim 8, wherein the zinc stannate film has a thickness in the range of 150 Å

to 500 Å

for example 150 Å

to 300 Å

.

11. The coating of claim 1, wherein the first infrared reflective film has a thickness in the range of 50 Å

to 150 Å

.

12. The coating of claim 1, wherein the second anti-reflective layer comprises a first zinc oxide film, a zinc stannate film deposited over the first zinc oxide film, and a second zinc oxide film deposited over the zinc stannate film.

13. The coating of claim 12, wherein the first zinc oxide film has a thickness in the range of 50 Å

to 150 Å

the zinc stannate film has a thickness in the range of 200 Å

to 500 Å and

the second zinc oxide film has a thickness in the range of 50 Å

to 150 Å

.

14. The coating of claim 1, wherein the second infrared reflective film has a thickness in the range of 50 Å

to 150 Å

.

15. The coating of claim 1, wherein the third anti-reflective layer comprises a first zinc oxide film, a zinc stannate film deposited over the first zinc oxide film, and a second zinc oxide film deposited over the zinc stannate film.

16. The coating of claim 15, wherein the zinc oxide films each have a thickness in the range of 50 Å

to 150 Å

.

17. The coating of claim 15, wherein the zinc stannate film has a thickness in the range of 200 Å

to 500 Å

.

18. The coating of claim 1, wherein the third infrared reflective film has a thickness in the range of 50 Å

to 100 Å

.

19. The coating of claim 1, including a fourth anti-reflective layer deposited over the third infrared reflective film.

20. The coating of claim 19, wherein the fourth anti-reflective layer comprises a zinc stannate film deposited over a zinc oxide film.

21. The coating of claim 20, wherein the zinc stannate film has a thickness in the range of 50 Å

to 200 Å

.

22. The coating of claim 20, wherein the zinc oxide film has a thickness in the range of 50 Å

to 150 Å

.

23. The coating of claim 19, including a protective overcoat and/or outer coating deposited over the fourth anti-reflective layer.

24. The coating of claim 23, wherein the protective overcoat and/or outer coating comprises at least one metal oxide selected from the group consisting of titanium oxide, aluminum oxide, silicon oxide, and mixtures thereof.

25. The coating of claim 24, wherein the protective overcoat and/or outer coating has a thickness in the range of 500 Å

to 5 microns.

55. Coating of claim 1 wherein the infrared reflecting films have silver and the total amount of silver in all three infrared reflecting films is in the range of 22 to 33 micrograms/centmeter²

26. A coating, comprising:

a first anti-reflective layer, said first anti-reflective layer comprising a zinc oxide film deposited over a zinc stannate film;

a first infrared reflective metallic film comprising silver and deposited over the first anti-reflective layer;

a second anti-reflective layer deposited over the first infrared reflective film, the second anti-reflective layer comprising a first zinc oxide film, a zinc stannate film deposited over the first zinc oxide film, and a second zinc oxide film deposited over the zinc stannate film;

a second infrared reflective metallic film comprising silver and deposited over the second anti-reflective layer;

a third anti-reflective layer deposited over the second infrared reflective metallic film, the third anti-reflective layer comprising a first zinc oxide film, a zinc stannate film deposited over the first zinc oxide film, and a second zinc oxide film deposited over the zinc stannate film; and

a third infrared reflective metallic film comprising silver and deposited over the third anti-reflective layer.

27. The coating of claim 26, further including a fourth anti-reflective layer deposited over the third infrared reflective metallic film, the fourth anti-reflective layer comprising a zinc oxide film with a zinc stannate film deposited over the zinc oxide film.

28. The coating of claim 26, wherein the first anti-reflective layer comprises zinc stannate having a thickness in the range of 200 Å

to 250 Å and

zinc oxide having a thickness of 100 Å

.

29. The coating of claim 26, wherein the first infrared reflective metallic film has a thickness of about 80 Å

.

30. The coating of claim 26, wherein for the second anti-reflective layer, the first zinc oxide film has a thickness of 100 Å

the zinc stannate film has a thickness of 400 Å and

the second zinc oxide film has a thickness of 100 Å

.

31. The coating of claim 26, wherein the second infrared reflective metallic film has a thickness in the range of 80 Å

to 90 Å

.

32. The coating of claim 26, wherein for the third anti-reflective layer the first zinc oxide film has a thickness of 100 Å

the zinc stannate film has a thickness of 400 Å and

the second zinc oxide film has a thickness of 100 Å

.

33. The coating of claim 26, wherein the third infrared reflective metallic film has a thickness in the range of 75 Å

to 85 Å

.

34. The coating of claim 27, wherein for the fourth anti-reflective layer the zinc oxide film has a thickness of 100 Å

and the zinc stannate film has a thickness in the range of 100 Å

to 150 Å

.

35. A method of coating a substrate, comprising the steps of:

depositing a first anti-reflective layer over at least a portion of the substrate;

depositing a first infrared reflective film over the first anti-reflective layer;

depositing a second anti-reflective layer over the first infrared reflective film;

depositing a second infrared reflective film over the second anti-reflective layer;

depositing a third anti-reflective layer over the second infrared reflective film; and

depositing a third infrared reflective film over the third anti-reflective layer.

36. A coated article, comprising:

a substrate;

a first anti-reflective layer deposited over at least a portion of the substrate;

a first infrared reflective film deposited over the first anti-reflective layer;

a second anti-reflective layer deposited over the first infrared reflective film;

a second infrared reflective film deposited over the second anti-reflective layer;

a third anti-reflective layer deposited over the second infrared reflective film; and

a third infrared reflective film deposited over the third anti-reflective layer.

37. A coating, comprising:

three spaced infrared reflective films, with at least one anti-reflective layer located between adjacent films.

38. The coating of claim 37, wherein the infrared reflective films include silver.

39. A heatable coated article, comprising:

a substrate; and

a coating comprising three spaced infrared reflective films comprising silver, wherein the coated article has a visible light transmittance of greater than or equal to 60%.

40. A coated article comprising,

a substrate;

a coating comprising three spaced infrared reflective films, wherein the visible light transmittance of the coated article is greater than 72%.

41. A coated article, comprising:

a substrate; and

a coating comprising three spaced infrared reflective films comprising silver, wherein the infrared reflective films have a sheet resistance in the range of 1.5 to 3 ohms per square.

42. A coated article, comprising:

a substrate;

a coating deposited over at least a portion of the substrate and comprising three spaced infrared reflective films, wherein the coated article has a visible light transmittance of greater than or equal to 60%.

43. The coated article of claim 42, wherein the infrared reflective films have a sheet resistance in the range of 1.5 to 3 ohms per square.

44. The coated article of claim 42, wherein the coated article has a color defined by a* and b* less than or equal to ±

|3| and an L* less than or equal to 50.

45. The coated article of claim 44, wherein the a* and b* are less than or equal to ±

|2|.

46. The coated article of claim 44, wherein the L* is selected from the group consisting of less than or equal to 44, less than or equal to 40, less than or equal to 36, less than or equal to 35, and less than or equal to 33.

47. The coated article of claim 42, wherein the coated article has a TSER in the range of 20% to 50% over the range of 300 nm to 2150 nm.

48. The coated article of claim 42, wherein the coated article has a visible light reflectance of less than or equal to 5% above the visible light reflectance of the substrate.

49. The coated article of claim 48, wherein the coated article has a visible light reflectance of less than 2% above the substrate.

50. The coated article of claim 48, wherein the coated article has a visible light reflectance of less than 1% above the substrate.

51. The coated article of claim 42, wherein the coated article has a Lta of greater than or equal to 72%.

52. The coated article of claim 42, wherein the coated article has a Lta of greater than or equal to 75%.

54. Coated article of claim 42 which includes:

at least one layer of interlayer material having two opposing major surfaces where one major surface faces the coating on the substrate, and

a second substrate facing the other major surface of the interlayer opposite the surface of the interlayer facing the coated substrate where the coated substrate, interlayer and substrate are in a lamination.

53. A method of improving the solar control properties of a coating having three or more infrared reflective films, comprising:

heating the coating to a temperature sufficient to obtain a sheet resistance in the range of 1.5 to 3 ohms per square for the infrared reflective films.