Laminated window assembly
A laminated window assembly has a first glass pane with a coating formed thereon, a second glass pane, and a polymeric interlayer provided between the first glass pane and the second glass pane. The coating includes a first layer deposited over a major surface of the glass pane, wherein the first layer has a refractive index of 1.6 or more and a thickness of 50 nm or less, a second layer deposited over the first layer, wherein the second layer has a refractive index that is less than the refractive index of the first layer and a thickness of 50 nm or less, a third layer deposited over the second layer, wherein the third layer has a refractive index that is greater than the refractive index of the second layer and a thickness of less than 500 nm, and a fourth layer deposited over the third layer, wherein the fourth layer has a refractive index that is less than the refractive index of the third layer and a thickness of 100 nm or less.
1. A laminated window assembly, comprising:
a first glass pane having a coating formed thereon, wherein the coating includes
i. a first layer deposited over a major surface of the glass pane, wherein the first layer has a refractive index of 1.6 or more and a thickness of 50 nm or less,
ii. a second layer deposited over the first layer, wherein the second layer has a refractive index that is less than the refractive index of the first layer and a thickness of 50 nm or less,
iii. a third layer deposited over the second layer, wherein the third layer has a refractive index that is greater than the refractive index of the second layer and a thickness of at least 250 nm and less than 500 nm,
iv. a fourth layer deposited over the third layer, wherein the fourth layer has a refractive index that is less than the refractive index of the third layer and a thickness of 100 nm or less;
a second glass pane; and
a polymeric interlayer provided between the first glass pane and the second glass pane.
2. The laminated window assembly according to claim 1 , wherein the laminated window assembly is a glazing for a vehicle.
3. The laminated window assembly according to claim 1 , wherein the coating is formed directly on a first major surface of the first glass pane.
4. The laminated window assembly according to claim 1 , wherein the coating is formed on a first major surface of the first glass pane and wherein an opposing second major surface of the first glass pane is uncoated.
5. The laminated window assembly according to claim 1 , wherein the coating consists essentially of the first layer, second layer, third layer, and fourth layer.
6. The laminated window assembly according to claim 1 , wherein the coating consists of the first layer, second layer, third layer, and fourth layer.
7. The laminated window assembly according to claim 1 , wherein the coating is pyrolytic.
8. The laminated window assembly according to claim 1 , wherein the first layer comprises an oxide of tin.
9. The laminated window assembly according to claim 1 , wherein the first layer has a thickness of 15-30 nm.
10. The laminated window assembly according to claim 1 , wherein the second layer comprises an oxide of silicon.
11. The laminated window assembly according to claim 1 , wherein the thickness of the second layer is 10-35 nm.
12. The laminated window assembly according to claim 1 , wherein the third layer comprises a transparent conductive metal oxide.
13. The laminated window assembly according to claim 1 , wherein the third layer comprises fluorine doped tin oxide (SnO2:F).
14. The laminated window assembly according to claim 1 , wherein the third layer has a thickness of at least 290 nm but at most 380 nm.
15. The laminated window assembly according to claim 1 , wherein the fourth layer comprises an oxide of silicon.
16. The laminated window assembly according to claim 1 , wherein the fourth layer has a thickness of 40-70 nm.
17. The laminated window assembly according to claim 1 , wherein the fourth layer forms an outer surface of the coating formed on the first glass pane.
18. The laminated window assembly according to claim 1 ,
wherein the second glass pane has a low emissivity coating formed on a first major surface thereof;
wherein the low emissivity coating is the same as coating formed on first glass pane; or
the low emissivity coating comprises a first layer deposited over a first major surface of the second glass pane wherein the first layer comprises an oxide of tin, a second layer deposited over the first layer wherein the second layer comprises an oxide of silicon and a third layer deposited over the second layer wherein the third layer comprises fluorine doped tin oxide.
19. The laminated window assembly according to claim 18 , wherein an opposing second major surface of the second glass pane defines a first surface of the laminated window assembly, the first major surface of the second glass pane defines a second surface of the laminated window assembly and is located adjacent polymeric interlayer, an opposing second major surface of the first glass pane defines a third surface of the laminated window assembly and is located adjacent polymeric interlayer, and the first major surface of the first glass pane defines a fourth surface of the laminated window assembly.
20. The laminated window assembly according to claim 1 , wherein the laminated window assembly exhibits a total visible light reflectance (Illuminant A, 2 degree observer) of 5.0% or less.