Composite pane comprising a functional element having electrically controllable optical properties

Patent metadata

Field	Value
Publication number	US-10919269-B2
Application number	US-201816604753-A
Country	US
Kind code	B2
Filing date	Feb 28, 2018
Priority date	Apr 12, 2017
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

A composite pane includes a functional element having electrically controllable optical properties, including a stack sequence formed of an outer pane, a first intermediate layer, a second intermediate layer, and an inner pane, wherein the intermediate layers contain at least one thermoplastic polymer film with at least one plasticizer, and a functional element having electrically controllable optical properties is arranged between the first intermediate layer and the second intermediate layer at least in sections, wherein between the first intermediate layer and the functional element as well as between the functional element and the second intermediate layer, at least one barrier film is arranged, which has, at least in sections, an overhang u beyond the functional element.

First claim

The invention claimed is:

1. Composite pane comprising a functional element having electrically controllable optical properties, comprising:
a stack sequence formed of an outer pane, a first intermediate layer, a second intermediate layer, and an inner pane, wherein the first and second intermediate layers contain at least one thermoplastic polymer film with at least one plasticizer, and
a functional element having electrically controllable optical properties is arranged between the first intermediate layer and the second intermediate layer at least in sections,

wherein between the first intermediate layer and the functional element as well as between the functional element and the second intermediate layer at least one barrier film is arranged and has, at least in sections, an overhang u beyond the functional element and overhanging sections of the barrier film are arranged immediately adjacent one another and contact one another, and wherein the at least one barrier film covers the functional element completely.

2. The composite pane according to claim 1 , wherein at least one barrier film is in each case arranged between the first intermediate layer and the functional element and between the second intermediate layer and the functional element, which barrier film has an all-around overhang u beyond the functional element.

3. The composite pane according to claim 1 , wherein the at least one barrier film is arranged between the first intermediate layer and the functional element and between the second intermediate layer and the functional element, which barrier film is folded at least in sections around a side edge of the functional element.

4. The composite pane according to claim 3 , wherein the at least one barrier film is folded around each side edge and the barrier films cover the functional element at least in sections.

5. The composite pane according to claim 3 , wherein the at least one barrier film has an overhang u beyond the functional element on other side edges of the functional element.

6. The composite pane according to claim 1 , wherein at least one of the first and second intermediate layers contains at least 3 wt.-% of a plasticizer and the plasticizer contains or consists of aliphatic diesters of tri- or tetraethylene glycol.

7. The composite pane according to claim 1 , wherein at least one of the first and second intermediate layers contains at least 60 wt.-% polyvinyl butyral (PVB).

8. The composite pane according to claim 1 , wherein the functional element is a polymer-dispersed liquid crystal (PDLC) film.

9. The composite pane according to claim 1 , wherein the barrier film is implemented such that the barrier film prevents the diffusion of plasticizer through the barrier film.

10. The composite pane according to claim 1 , wherein the barrier film is low in plasticizer or free of plasticizer and contains or consists of polyethylene terephthalate or polyvinyl fluoride.

11. The composite pane according to claim 1 , wherein the overhang u of the barrier film beyond the functional element is at least 0.5 mm.

12. The composite pane according to claim 1 , wherein the overhang u of the barrier film beyond the functional element is less than 50 mm.

13. The composite pane according to claim 1 , wherein the at least one barrier film includes first and second barrier films are joined to one another at least in sections in the region of the overhang u.

14. The composite pane according to claim 1 , wherein the at least one barrier film includes first and second barrier films having the functional element and are joined to one another over their entire surface in the region of the overhang u.

15. The composite pane according to claim 1 , wherein the functional element and the barrier film are circumferentially surrounded by a third intermediate layer.

16. Method for producing a composite pane according to claim 1 , comprising
a) arranging one outer pane, one first intermediate layer, one functional element having electrically controllable optical properties, one second intermediate layer, and one inner pane one atop another in this order, wherein at least one barrier film is arranged between the functional element and the first and second intermediate layers, the at least one barrier film covering the functional element completely, and
b) joining the outer pane and the inner pane by lamination, wherein an intermediate layer with an embedded functional element is formed from the first intermediate layer and the second intermediate layer.

17. The method according to claim 16 , wherein before step a), a first barrier film and the first intermediate layer and/or a second barrier film and the second intermediate layer are glued to one another.

18. The method according to claim 16 , wherein in step a), a third intermediate layer that surrounds the functional element is arranged between the first intermediate layer and the second intermediate layer.

19. A method comprising utilizing a composite pane according to claim 1 as a windshield or roof panel of a vehicle and the electrically controllable functional element as a sun visor.

20. A method comprising utilizing a composite pane having an electrically controllable functional element according to claim 1 as interior glazing or exterior glazing in a vehicle or a building and the electrically controllable functional element as a sun screen or as a privacy screen.

Assignees

• Saint Gobain

Inventors

• Dröge Alicia
• Klein Marcel

Classifications

• B32B17/10302

  Edge sealing · CPC title

• G02F2201/501

  Blocking layers, e.g. against migration of ions · CPC title

• G02F1/1334 Primary

  based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals · CPC title

• B32B17/10761

  containing vinyl acetal · CPC title

• B32B17/1066

  imparting a tint in certain regions only, i.e. shade band · CPC title