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EP-4739499-A1 - COMPOSITE PANE

EP4739499A1EP 4739499 A1EP4739499 A1EP 4739499A1EP-4739499-A1

Abstract

The invention relates to a composite pane having IR reflective coating and low emissivity coating, to a method to provide for said pane and to uses thereof.

Inventors

  • DE BECKER, Charlie
  • HEVESI, KADOSA

Assignees

  • AGC Glass Europe

Dates

Publication Date
20260513
Application Date
20240701

Claims (16)

  1. 1. A composite pane, comprising a. a first glass pane having an outer-side surface and an interior-side surface, characterized by an infrared transmission TIR > 60%, in the wavelengths of 780-2500 nm, and a visible transmission T VjS < 10%, alternatively < 6%, in the wavelengths of 380 - 780 nm, and a ratio Tvis / TIR < 0.20, for a glass sheet of 4 mm thickness; b. a second glass pane having an outer-side surface and an interior-side surface, different from the first pane, characterized by a ratio Tvis / TIR > 0.50, and by a ratio Tvis/TE > 0.70, for a glass sheet of 4 mm thickness, with TIR considered in the wavelengths of 780- 2500 nm, and Tvis considered in the wavelengths of 380 - 780 nm, and TE considered in the wavelength range of 300 - 2500 nm; and c. a thermoplastic interlayer that joins the interior-side surface of the outer pane to the outerside surface of the inner pane, wherein the composite pane comprises, between the outer pane and the inner pane, at least one infrared reflective coating.
  2. 2. The composite pane according to claim 1 , wherein, when the second glass pane is the inner pane of said composite pane in the installed position, the second glass pane is further characterized by a visible transmission Tvis > 65%, in the wavelengths of 380 - 780 nm, and a transmitted energy TE > 35%, for a glass sheet of 4 mm thickness.
  3. 3. The composite pane according to any one of claim 1 or 2, wherein the second glass pane is further characterized by any one or more of the following characteristics, for a glass sheet of 4 mm thickness: - 30% < TE < 92% - Tvis *TE/TIR > 80
  4. 4. The composite pane according to claim 1 , wherein, when the second glass pane is the inner pane of said composite pane in the installed position, the second glass pane is further characterized by an infrared transmission TIR < 25% , in the wavelengths of 780- 2500 nm, and a visible transmission Tvis ranging of from 3 to 65% , in the wavelengths of 380 - 780 nm, for a glass sheet of 4 mm thickness.
  5. 5. The composite pane according to any one of claim 1 or 4, wherein the second glass pane is further characterized by any one or more of the following characteristics, for a glass sheet of 4 mm thickness: 2% < TE < 25% 5 < Tvis *TE/TIR < 80
  6. 6. The composite pane according to any one of the preceding claims, wherein the first glass pane is further characterized by any one or more of the following characteristics, for a glass sheet of 4 mm thickness: - 25% < TE < 50% Tvis / TE < 0.30 ; alternatively < 0.20 - Tvis *TE/TIR < 3
  7. 7. A composite pane according to any one of the preceding claims, further comprising a low emissivity coating on the interior-side surface of the inner pane.
  8. 8. The composite pane according to claim 7, wherein the low emissivity coating comprises at least one functional layer that contains a transparent conductive oxide (TCO), selected from indium tin oxide, antimony-doped or fluorine-doped tin oxide, gallium- and/or aluminum-doped zinc oxide, mixed indium zinc, vanadium oxide, tungsten and/or magnesium doped vanadium oxide, niobium-doped titanium oxide, cadmium stannate and/or zinc stannate; or at least one nitride based functional layer with low emissivity properties selected from titanium nitride, chromium nitride, niobium nitride, molybdenum nitride hafnium nitride, or mixtures thereof.
  9. 9. The composite pane according to any one of claim 7 or 8, wherein the low emissivity coating comprises at least one functional layer that contains a transparent conductive oxide (TCO), selected from indium tin oxide, antimony-doped or fluorine-doped tin oxide and/or aluminum- doped zinc oxide (ZnO:AI) and/or gallium-doped zinc oxide (ZnO:Ga).
  10. 10. The composite pane according to any one of claim 7 to 9, wherein the low emissivity coating comprises the following layers, in sequence: a first high refractive index layer, a first low refractive index layer, a transparent conductive oxide layer, an optional barrier layer, a second low refractive index layer, and an optional top coat having a low refractive index.
  11. 11 .The composite pane according to any one of the preceding claims, wherein the at least one IR reflective coating is applied directly to the interior-side surface of the outer pane or is arranged on a carrier film embedded in the interlayer.
  12. 12. The composite pane according to any one of the preceding claims, wherein the IR reflective coating comprises n infrared reflective (IR) layers and n + 1 dielectric layers, with n > 1 , such that each IR layer is surrounded by two dielectric layers.
  13. 13. The composite pane according to any one of the preceding claims, wherein the IR reflective coating comprises n infrared reflective (IR) layers and n + 1 dielectric layers, with n > 2, such that each IR layer is surrounded by two dielectric layers.
  14. 14. The composite pane according to any one of the preceding claims, wherein the at least one thermoplastic film layer contains polyvinyl butyral (PVB), copolymers of vinyl ethylene and vinyl acetate (EVA), polyurethane (Pll), polyvinyl chloride (PVC), and/or mixtures thereof and/or copolymers thereof.
  15. 15. Use of the composite pane according to any one of claims 1-14, as a window pane in a vehicle.
  16. 16. Use of the composite pane according to claim 15 wherein the window pane is a lateral window, a rear window or a roof window.

Description

COMPOSITE PANE [0001] The invention relates to a composite pane having IR reflective coating and low emissivity coating, to a method to provide for said pane and to uses thereof. [0002] Composite panes having sun protection are known in the art. [0003] WO2019/110172 relates to a composite pane, comprising: an outer pane (1), which has an outer surface (I) and an interior-side surface (II); an inner pane (2), which has an outer surface (III) and an interior-side surface (IV); and a thermoplastic interlayer (3), which connects the interior-side surface (II) of the outer pane (1) to the outer surface (III) of the inner pane (2), the composite pane having at least one sun protection coating (4) between the outer pane (1) and the inner pane (2), which sun protection coating reflects or absorbs mainly radiation outside of the visible spectrum of the solar radiation, in particular infrared radiation, and the composite pane having, on the interior-side surface (IV) of the inner pane (2), a thermal-radiation-reflecting coating (5) (low-E coating), characterized in that the composite pane has a transmittance index A of 0.02 to 0.08, the transmittance index A being determined according to the following formula (I): A = TLcomposite glass pane/(TLiow-E-coated pane * TE) (I), TL being the light transmittance and TE being the energy transmission measured according to ISO 9050. The goal was to have the lowest possible TTS value (measure of the total transmitted heat radiation of the sun through the pane, and for example according to the ISO 9050) in combination with a light transmission of 2 to 10% in order to ensure the best possible compromise between the view through the roof to the outside and good thermal properties. [0004] W02005007592A2 discloses a vehicle glazing comprising a pane of tinted glass, tinted by at least 1.0 to 1.8 % wt. of total iron, having a low emissivity coating on its interior surface. The coating has an emissivity from 0.05 to 0.4 and may include a transparent conductive oxide (and optionally a dopant), or a metal layer and at least one dielectric layer. Also disclosed is a laminated glazing comprising two plies of glass, laminated by a sheet of interlayer material therebetween, wherein at least one ply of glass or the sheet of interlayer material is body tinted, said glazing having a low emissivity coating on its interior surface. The inner ply may be clear glass or tinted glass. The interlayer material may be clear PVB or tinted PVB, and it may further be infra-red reflecting. Either of the glazings may be used as a roof or other vehicle glazing. [0005] EP2090428A1 relates to a glazing with high thermal performance for a vehicle, in particular for a roof of a motor vehicle, and this new glazing is a laminated glazing consisting of an outer glass, a inner glass, an interlayer between the two glasses consisting of at least one absorbent PVB-based film, the inner glass being coated on its inner side with a low-emissivity layer. The optimal solution preferred in EP2090428A1 is the use of a tinted outer glass, and a clear inner glass as a support for the low emissivity layer. [0006] WO2016202799A1 relates to a laminated glazing comprising a substrate, in particular a transparent substrate, optionally coloured, coated with an infrared-reflecting layer and capable of being used as glazing in buildings or in vehicles. The coated substrate is made up of the combination of a glass substrate in which the composition has a redox of less than 15 %, characterised by infrared reflection RIRV so that RIRV > 1.087 * TLV, wherein TLV is the light transmission of the glass, and an infrared reflecting layer characterised by light transmission TLC so that TLC > 1.3 * TIRC, wherein TIRC is the infrared transmission of the layer. [0007] Glazings intended for use in sunroofs and sliding roofs require light transmittance between 2 and 10% and specific sun protection. For the visual comfort of occupants, the reflection of light is targeted at less than 10%, preferably less than 8%. For the thermal comfort of occupants, a low total transmitted heat radiation (TTS) is desired, less than 35%. [0008] The objective is, consequently, to provide for a composite pane with current requirements in terms of thermal management, light management, low reflection inside and low reflection outside. OBJECTIVE [0009] The composite pane therefore is targeted to possess the following characteristics: - a light transmittance Tvis of 1 to 10%, preferably of 1 to 8%, in order to ensure the best possible compromise between vision outside through the roof and good thermal properties; - a light reflectance observed from the outside Rout < 9%; - a light reflectance observed from the inside Rin < 10%; - a total transmitted heat radiation (TTS) < 22%, preferably < 16%, (measured according to ISO 9050). [0010] This object is accomplished according to the invention by a composite pane comprising a. a first glass pane having an outer-side surface an