Substrate having thermal management coating for an insulating glass unit

• US 20070116967A1
• Filed: 09/11/2006
• Published: 05/24/2007
• Est. Priority Date: 05/03/2002
• Status: Active Grant

• Current Assignee: Vitro Flat Glass LLC (Compagnie De Saint-Gobain)
• Original Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Inventors: Wagner, Andrew, O'Shaughnessy, Dennis, Medwick, Paul
• Granted Patent: US 7,910,229 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 17/3613 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 17/3681 the multilayer coating being used in glazing, e.g. windows or windscreens

Abstract

A coated article is provided for use in an IG unit. The article includes a substrate and a coating formed over at least a portion of the substrate. The coating includes a plurality of separation layers having one or more dielectric layers and a plurality of infrared reflective layers. The coating can be positioned on the #2 or #3 surface of the IG unit and can provide a reference solar heat gain coefficient of less than or equal to 0.35.

Claims

1-40. -40. (canceled)

41. An insulating glass unit, comprising:

a first pane defining a #1 surface and a #2 surface;

at least one second pane comprising clear glass and defining a #3 surface and a #4 surface, with the #2 surface facing the #3 surface; and

a coating formed over at least a portion of the #3 surface;

wherein the coating comprises two or more infra-red reflective layers; and

wherein the coating provides the unit with a reference solar heat gain coefficient of less than or equal to 0.36.

42. The unit of claim 41, wherein the coating provides a reference heat gain coefficient of less than or equal to 0.32.

43. The unit of claim 41, having a reference visible light transmittance in the range of 50% to 60%.

44. The unit of claim 41, having a reference transmitted a* (a*T) in the range of −

5 to −

12.

45. The unit of claim 41, having a reference transmitted b* (b*T) in the range of 0 to 5.

46. The unit of claim 41, having a reference exterior visible light reflectance (Rext vis) in the range of 5% to 15%.

47. The IG unit of claim 41, having a reference reflected exterior a* (Rexta*) in the range of −

2 to −

10.

48. The IG unit of claim 41, having a reference reflected exterior b* (Rextb*) in the range of −

0 to −

5.

49. The IG unit of claim 41, having a reference shading coefficient of less than 0.41.

50. The unit of claim 41, wherein the first pane comprises tinted or colored glass.

51. The unit of claim 41, wherein the coating comprises:

a first separation layer comprising at least one dielectric layer;

a first infrared reflective layer deposited over the first separation layer;

a second separation layer comprising at least one dielectric layer deposited over the first infrared reflective layer;

a second infrared reflective layer deposited over the second separation layer;

a third separation layer comprising at least one dielectric layer deposited over the second infrared reflective layer; and

a third infrared reflective layer deposited over the third separation layer.

52. The unit of claim 51, wherein the separation layers include at least one material selected from the group consisting of metal oxides, oxides of metal alloys, mixtures of metal oxides, doped metal oxides, nitrides, oxynitrides, and mixtures thereof.

53. The unit of claim 51, wherein at least one of the dielectric layers comprises a plurality of dielectric films.

54. The article of claim 51, wherein the infrared reflective layers include at least one metal selected from the group consisting of gold, copper, silver, or mixtures, alloys, or combinations thereof.

55. The unit of claim 51, wherein the first separation layer comprises a zinc oxide layer deposited over a zinc stannate layer.

56. The unit of claim 51, wherein the second separation layer comprises a first zinc oxide layer, a zinc stannate layer deposited over the first zinc oxide layer, and a second zinc oxide layer deposited over the zinc stannate layer.

57. The unit of claim 51, wherein the third separation layer comprises a first zinc oxide layer, a zinc stannate layer deposited over the first zinc oxide layer, and a second zinc oxide layer deposited over the zinc stannate layer.

58. The article of claim 51, including a fourth separation layer comprising at least one dielectric layer deposited over the third infrared reflective layer.

59. The article of claim 58, wherein the fourth layer comprises a zinc stannate layer deposited over a zinc oxide layer.

60. An insulating glass unit, comprising:

a first pane defining a #1 surface and a #2 surface, the first pane comprising tinted or colored glass;

at least one second pane comprising clear glass and defining a #3 surface and a #4 surface, with the #2 surface facing the #3 surface; and

a coating formed over at least a portion of the #3 surface, wherein the coating comprises;

a first separation layer comprising a zinc oxide layer deposited over a zinc stannate layer;

a first infrared reflective layer deposited over the first separation layer;

a second separation layer comprising a first zinc oxide layer, a zinc stannate layer deposited over the first zinc oxide layer, and a second zinc oxide layer deposited over the zinc stannate layer;

a second infrared reflective layer deposited over the second separation layer;

a third separation layer comprising a first zinc oxide layer, a zinc stannate layer deposited over the first zinc oxide layer, and a second zinc oxide layer deposited over the zinc stannate layer;

a third infrared reflective layer deposited over the third separation layer; and

a fourth separation layer comprising a zinc stannate layer deposited over a zinc oxide layer;

wherein the coating provides the unit with a reference solar heat gain coefficient of less than or equal to 0.36, a reference visible light transmittance in the range of 50% to 60%, a reference transmitted a* (a*T) in the range of −

5 to −

12, a reference transmitted b* (b*T) in the range of 0 to 5, a reference exterior visible light reflectance (Rext vis) in the range of 5% to 15%, a reference reflected exterior a* (Rexta*) in the range of −

2 to −

10, a reference reflected exterior b* (Rextb*) in the range of −

0 to −

5, and a reference shading coefficient of less than 0.41.