Infrared radiation reflecting insulated glazing unit
An insulated glazing unit is described and includes a first transparent substrate spaced apart from a parallel second transparent substrate, a sealed void space defined between the first transparent substrate, second transparent substrate, and the window mounting member, and an infrared radiation reflecting multilayer polymeric film disposed between the first transparent substrate and the second transparent substrate. The infrared radiation reflecting multilayer polymeric film includes a plurality of alternating polymeric layers of a first polymer material and a second polymer material. At least one of the alternating polymer layers is birefringent and oriented. The alternating, polymeric layers cooperate to reflect infrared radiation.
1. An insulated glazing unit comprising:
a first transparent substrate spaced apart from a parallel second transparent substrate;
a sealed void space defined between the first transparent substrate and the second transparent substrate; and
at least one infrared radiation reflecting multilayer polymeric film disposed between the first transparent substrate and the second transparent substrate; wherein the infrared radiation reflecting multilayer polymeric film comprises a plurality of alternating polymeric layers of a first polymer material and a second polymer material and at least one of the alternating polymer layers is birefringent and oriented and the alternating polymeric layers cooperate to reflect infrared radiation and the multilayer polymeric film has a thickness of at least 2 mils.
2. An insulated glazing unit according to claim 1 wherein the first transparent substrate and the second transparent substrate comprise glass.
3. An insulated glazing unit according to claim 1 wherein the sealed void space comprises air, argon gas, xenon gas, or krypton gas.
4. An insulated glazing unit according to claim 1 further comprising a low emissivity coating disposed on the first transparent substrate or the second transparent substrate.
5. An insulated glazing unit according to claim 1 wherein the first polymer material comprises polyethylene terephthalate or a copolymer of polyethylene terephthalate and the second polymer material comprises poly(methyl methacrylate) or a copolymer of poly(methyl methacrylate).
6. An insulated glazing unit according to claim 1 wherein the first polymer material comprises a glycolated polyethylene terephthalate or a copolymer of a glycolated polyethylene terephthalate and the second polymer material comprises polyethylene naphthalate or a copolymer of polyethylene naphthalate.
7. An insulated glazing unit according to claim 1 further comprising infrared radiation reflecting pigment layer disposed adjacent to the infrared radiation reflecting multilayer polymeric film.
8. An insulated glazing unit according to claim 1 further comprising an infrared radiation absorbing pigment layer disposed adjacent to the infrared radiation reflecting multilayer polymeric film.
9. An insulated glazing unit according to claim 1 further comprising an infrared radiation reflecting metal layer disposed adjacent to the infrared radiation reflecting multilayer polymeric film.
10. An insulated glazing unit according to claim 1 further comprising a fluorine doped tin oxide low emissivity coating disposed on the first transparent substrate or the second transparent substrate.
11. An insulated glazing unit according to claim 1 wherein the infrared radiation reflecting multilayer polymeric film is disposed adjacent to the first transparent substrate or the second transparent substrate.
12. An insulated glazing unit according to claim 1 wherein the infrared radiation reflecting multilayer polymeric film is adhered to the first transparent substrate or the second transparent substrate with an adhesive.
13. An insulated glazing unit according to claim 12 wherein the adhesive includes a UV absorber.
14. An insulated glazing unit according to claim 1 wherein the infrared radiation reflecting multilayer polymeric film is spaced away from the first transparent substrate and the second transparent substrate.
15. An insulated glazing unit according to claim 1 wherein the infrared radiation reflecting multilayer polymeric film is disposed adjacent to the first transparent substrate or the second transparent substrate and a third transparent substrate is disposed adjacent to the infrared radiation reflecting multilayer polymeric film.
16. An insulated glazing unit according to claim 15 wherein a low emissivity coating is disposed on the second transparent substrate or third transparent substrate.
17. An insulated glazing unit according to claim 16 wherein the low emissivity coating comprises a fluorine doped tin oxide.
18. An insulated glazing unit according to claim 16 wherein the low emissivity coating comprises a silver layer.
19. An insulated glazing unit according to claim 18 wherein a dielectric layer is disposed adjacent to the silver layer.
20. An insulated glazing unit according to claim 1 further comprising a porous insulating material having a thickness of 3 mm or greater and disposed between the first transparent substrate and the second transparent substrate.
21. An insulated glazing unit according to claim 20 wherein the porous insulating material comprises porous silica having a void volume of 50% or greater.
22. An insulated glazing unit according to claim 20 wherein the porous insulating material comprises aerogel.
23. An insulated glazing unit according to claim 20 wherein the porous insulating sol material comprises a hydrophobic silica aerogel.