Composite panel with electrically switchable optical properties

• US 10,082,716 B2
• Filed: 06/28/2013
• Issued: 09/25/2018
• Est. Priority Date: 08/21/2012
• Status: Active Grant

• Current Assignee: Saint-Gobain Glass France (Compagnie De Saint-Gobain)
• Original Assignee: Saint-Gobain Glass France (Compagnie De Saint-Gobain)
• Inventors: Mennig, Julius, Penners, Franz
• Primary Examiner(s): Won, Bumsuk
• Assistant Examiner(s): MADONNA, JEFFREY E
• Application Number:
  US14/418,898
• Publication Number:
  US 20150331296A1
• Time in Patent Office: 1,915 Days
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: B32B 17/10174 Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
• CPC Class Codes: B32B 17/1022 Metallic coatings
• CPC Class Codes: B32B 17/10229 Metallic layers sandwiched by dielectric layers
• CPC Class Codes: B32B 17/10467 Variable transmission
• CPC Class Codes: B32B 17/10504 Liquid crystal layer
• CPC Class Codes: B32B 17/10532 Suspended particle layer
• CPC Class Codes: B32B 17/10788 containing ethylene vinylacetate
• CPC Class Codes: B32B 2307/412 Transparent
• CPC Class Codes: B32B 2307/71 Resistive to light or to UV
• CPC Class Codes: B32B 2398/20 Thermoplastics
• CPC Class Codes: B32B 37/12 characterised by using adhesives
• CPC Class Codes: B32B 37/18 involving the assembly of discrete sheets or panels only
• CPC Class Codes: G02B 5/208 for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
• CPC Class Codes: G02F 1/172 based on a suspension of orientable dipolar particles, e.g. suspended particles displays

Abstract

A composite panel with electrically switchable optical properties, having: an outer panel and an inner panel which are connected to one another over the entire length thereof via an interlayer; within the interlayer, a switchable functional element with at least one active layer; and an infrared protective coating arranged between the outer panel and the active layer over the entire length thereof, wherein the infrared protective coating contains at least three functional layers with reflecting properties for the infrared range.

Claims

1. A composite pane with electrically switchable optical properties, comprising:

an outer pane and an inner pane, which are laminarily bonded to one another via an intermediate layer; and

inside the intermediate layer, a prelaminated functional element including,

a) a switchable functional element that contains,

a1) at least one active layer,

a2) an infrared protective coating that contains at least three functional layers with reflecting properties for the infrared range, the infrared protective coating being an outer plate electrode, and

a3) and inner plate electrode,

b) a first carrier film, and

c) a second carrier film,

wherein the infrared protective coating is laminarily arranged between the outer pane and the active layer,

wherein the switchable functional element is laminarily arranged between the first carrier film and the second carrier film,

wherein the first carrier film is bonded to the outer pane at least via one first thermoplastic adhesive film and the second carrier film is bonded to the inner pane via at least one second thermoplastic adhesive film,

wherein the infrared protective coating is laminarily arranged on the surface of the first carrier film facing the at least one active layer,

wherein the at least one active layer is laminarily arranged between the outer plate electrode and the inner plate electrode,

wherein the prelaminated functional element is a previously prepared prelaminated functional element with integrated infrared protective coating, and

wherein the composite pane has an edge region that is not provided with the infrared protective coating.

2. The composite pane according to claim 1, wherein the switchable functional element is a suspended particle device (SPD) functional element.

3. The composite pane according to claim 1, wherein the functional layers contain at least one metal.

4. The composite pane according to claim 1, wherein each functional layer has a thickness from 5 nm to 50 nm.

5. The composite pane according to claim 1, wherein each functional layer is arranged between two dielectric layers, which contain at least one oxide or one nitride.

6. The composite pane according to claim 1, wherein the outer pane and/or the inner pane contain non-prestressed, partially prestressed, or prestressed glass.

7. The composite pane according to claim 1, wherein the averaged transmittance of the infrared protective coating in the spectral range from 800 nm to 900 nm is less than or equal to 15%.

8. A method for producing the composite pane according to claim 1, the method comprising:

a) providing the previously prepared prelaminated functional element,

b) arranging the intermediate layer with the previously prepared prelaminated functional element laminarily between the outer pane and the inner pane, and

c) bonding the outer pane to the inner pane via the intermediate layer,

wherein the providing of the previously prepared prelaminated functional element includes applying the infrared protective coating on a surface of the first carrier film during preparing the previously prepared prelaminated functional element.

9. The method according to claim 8, wherein preparing the previously prepared prelaminated functional element further includes heating the infrared protective coating after the applying of the infrared protective coating to a temperature of at least 200°

C.

10. The composite pane according to claim 3, wherein the functional layers contain silver.

11. The composite pane according to claim 4, wherein each functional layer has a thickness from 8 nm to 25 nm.

12. The composite pane according to claim 5, wherein each functional layer is arranged between two dielectric layers, which contain silicon nitride.

13. The composite pane according to claim 6, wherein the outer pane and/or the inner pane contain flat glass, float glass, quartz glass, borosilicate glass, soda lime glass, polyethylene, polypropylene, polycarbonate, polymethyl methacrylate, polystyrene, polyamide, polyester or polyvinyl chloride.

14. The composite pane according to claim 6, wherein the outer pane and/or the inner pane have a thickness from 0.5 mm to 15 mm.

15. The composite pane according to claim 6, wherein the outer pane and/or the inner pane have a thickness from 1 mm to 5 mm.

16. The composite pane according to claim 7, wherein the averaged transmittance of the infrared protective coating in the spectral range from 800 nm to 900 nm is less than or equal to 10%.