US2004009356A1PendingUtilityA1

Substrate having thermal management coating for an insulating glass unit

45
Priority: May 3, 2002Filed: May 2, 2003Published: Jan 15, 2004
Est. expiryMay 3, 2022(expired)· nominal 20-yr term from priority
Inventors:Paul A. MedwickAndrew V. WagnerDennis J. O'Shaughnessy
C03C 17/3681C03C 17/3613C03C 17/36C03C 17/366C03C 17/3639C03C 17/3618
45
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Claims

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

exact text as granted — not AI-modified
What is claimed is:  
     
         1 . A coated article for use in an IG unit, comprising; 
 a substrate; and    a coating formed over at least a portion of the substrate, 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,  
 wherein the coating is identified for a position on the #2 or #3 surface of the IG unit after being mounted.  
   
     
     
         2 . The article according to  claim 1 , wherein the coating is on the #3 surface.  
     
     
         3 . The article according to  claim 1 , wherein the separation 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.  
     
     
         4 . The article of  claim 3 , wherein the separation 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.  
     
     
         5 . The article of  claim 1 , wherein at least one of the dielectric layers comprises a plurality of dielectric films.  
     
     
         6 . The article of  claim 1 , 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.  
     
     
         7 . The article of  claim 1 , wherein the first separation layer comprises a zinc oxide layer deposited over a zinc stannate layer.  
     
     
         8 . The article of  claim 7 , wherein the zinc oxide layer has a thickness in the range of 100 Å to 200 Å.  
     
     
         9 . The article of  claim 7 , wherein the zinc stannate layer has a thickness in the range of 250 Å to 400 Å.  
     
     
         10 . The article of  claim 1 , wherein the first infrared reflective layer has a thickness in the range of 100 Å to 150 Å.  
     
     
         11 . The article of  claim 1 , 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.  
     
     
         12 . The article of  claim 11 , wherein the first zinc oxide layer has a thickness in the range of 100 Å to 150 Å, the zinc stannate layer has a thickness in the range of 200 Å to 500 Å, and the second zinc oxide layer has a thickness in the range of 100 Å to 150 Å.  
     
     
         13 . The article of  claim 1 , wherein the second infrared reflective layer has a thickness in the range of 100 Å to 150 Å.  
     
     
         14 . The article of  claim 1 , 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.  
     
     
         15 . The article of  claim 14 , wherein the zinc oxide layers each have a thickness in the range of 100 Å to 150 Å.  
     
     
         16 . The article of  claim 15 , wherein the zinc stannate layer has a thickness in the range of 450 Å to 550 Å.  
     
     
         17 . The article of  claim 1 , wherein the third infrared reflective layer has a thickness in the range of 140 Å to 180 Å.  
     
     
         18 . The article of  claim 1 , including a fourth separation layer comprising at least one dielectric layer deposited over the third infrared reflective layer.  
     
     
         19 . The article of  claim 18 , wherein the fourth layer comprises a zinc stannate layer deposited over a zinc oxide layer.  
     
     
         20 . The article of  claim 19 , wherein the zinc stannate layer has a thickness in the range of 150 Å to 250 Å.  
     
     
         21 . The article of  claim 19 , wherein the zinc oxide layer has a thickness in the range of 80 Å to 120 Å.  
     
     
         22 . The article of  claim 18 , including a protective overcoat deposited over the fourth separation layer and comprising titania having a thickness in the range of 20 Å to 50 Å.  
     
     
         23 . An IG unit having the article of  claim 1 .  
     
     
         24 . A coated article for use in an IG unit, comprising: 
 a substrate; and    a coating formed over at least a portion of the substrate, wherein the coating comprises: 
 a first separation layer comprising at least one dielectric layer;  
 a first infrared reflective layer formed over the first separation layer;  
 a second separation layer comprising at least one dielectric layer formed over the first infrared reflective layer; and  
 a second infrared reflective layer formed over the second separation layer, wherein the coating is identified for a position on the #2 or #3 surface of the IG unit after being mounted, and wherein the coating provides a reference solar heat gain coefficient of less than or equal to 0.36.  
   
     
     
         25 . The coated article of  claim 24 , wherein the coating provides a reference solar heat gain coefficient of less than or equal to 0.32.  
     
     
         26 . The coated article of  claim 24 , wherein the coating is identified for a position on the #3 surface.  
     
     
         27 . An IG unit having the article of  claim 24 .  
     
     
         28 . An IG unit, comprising: 
 a first pane defining a #1 and a #2 surface;    at least one second pane defining a #3 and a #4 surface; and    a coating formed over at least a portion of the #2 or #3 surface, 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.  
   
     
     
         29 . The IG unit of  claim 28 , having a reference visible light transmittance in the range of 50% to 60%.  
     
     
         30 . The IG unit of  claim 28 , having a reference transmitted a* (a*T) in the range of −5 to −12.  
     
     
         31 . The IG unit of  claim 28 , having a reference transmitted b* (b*T) in the range of 0 to 5.  
     
     
         32 . The IG unit of  claim 28 , having a reference exterior visible light reflectance (Rext vis) in the range of 5% to 15%.  
     
     
         33 . The IG unit of  claim 28 , having a reference reflected exterior a* (Rexta*) in the range of −2 to −10.  
     
     
         34 . The IG unit of  claim 28 , having a reference reflected exterior b* (Rextb*) in the range of −0 to −5.  
     
     
         35 . The IG unit of  claim 28 , having a reference shading coefficient of less than 0.41.  
     
     
         36 . The IG unit of  claim 28 , having a reference solar heat gain coefficient of less than 0.36.  
     
     
         37 . The IG unit of  claim 28 , wherein the coating is formed on the #3 surface.  
     
     
         38 . An IG unit, comprising: 
 a first pane defining a #1 and a #2 surface;    at least one second pane defining a #3 and a #4 surface; and    a coating formed over at least a portion of the #2 or #3 surface, the coating comprising: 
 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; and  
 a second infrared reflective layer deposited over the second separation layer, wherein the coating provides a reference solar heat gain coefficient of less than or equal to 0.36.  
   
     
     
         39 . The IG unit of  claim 38 , wherein the coating provides a reference solar heat gain coefficient of less than or equal to 0.32.  
     
     
         40 . The IG unit of  claim 38 , wherein the coating is on the #3 surface.

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