Heat treatable coated glass pane

Patent metadata

Field	Value
Publication number	US-9630875-B2
Application number	US-201213261756-A
Country	US
Kind code	B2
Filing date	Apr 16, 2012
Priority date	Apr 21, 2011
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

A coated glass pane comprising at least the following layers in sequence: a glass substrate; a lower anti-reflection layer; a silver-based functional layer; a barrier layer, comprising at least the following three partial barrier layers in sequence from the silver-based functional layer, a lower partial barrier layer based on an oxide of Zn, Ti, ZnSn, InSn, Zr, Al, Sn and/or Si, and/or an (oxi)nitride of Si and/or of Al, having a thickness of at most 5 nm, a central partial barrier layer based on an oxide of Zn, Ti, Zn Sn, InSn, Zr, Al, Sn and/or Si, and/or an (oxi)nitride of Si and/or of Al, having a thickness of at most 5 nm, and an upper partial barrier layer based on an oxide of Zn, Ti, Zn Sn, InSn, Zr, Al, Sn and/or Si, and/or an (oxi)nitride of Si and/or of Al, having a thickness of at most 10 nm; and an upper anti-reflection layer; wherein the central partial barrier layer has a different composition to both the lower partial barrier layer and the upper partial barrier layer.

First claim

The invention claimed is:

1. A coated glass pane comprising at least the following sequence of layers:
a glass substrate;
a lower anti-reflection layer, the lower anti-reflection layer comprising in sequence from the glass substrate:
a base layer, located directly on the glass substrate, based on an (oxi)nitride of silicon and/or an (oxi)nitride of aluminium and/or alloys thereof, and/or an oxide of titanium, and/or an oxide of zirconium; and
a layer based on an oxide of zinc and tin and/or and oxide of tin; and
a top layer based on an oxide of zinc;

a silver-based functional layer located on the lower anti-reflection layer;
a barrier layer located directly on the silver-based functional layer, the barrier layer comprising in direct sequence from the silver-based functional layer the following three partial barrier layers;
a lower partial barrier layer having a thickness of at most 5 nm;
a central partial barrier layer having a thickness of at most 5 nm; and
an upper partial barrier layer; and wherein
the three partial barrier layers are selected from the group consisting of the following combinations of layers in the order lower partial barrier layer/central partial barrier layer/upper partial barrier layer: ZnO:Al/ZnSnO x /ZnO:Al, TiO x /ZnSnO x /ZnO:Al, TiO x /ZnSnO x /TiO x and ZnO:Al/ZnSnO x /TiO x ; and

wherein
an upper anti-reflection layer located directly on the upper partial barrier layer; and
wherein the coated glass pane has a high visible light transmittance.

2. The pane according to claim 1 , wherein the lower anti-reflection layer comprises, in sequence from the glass substrate,
a base layer based on an (oxi)nitride of silicon, an (oxi)nitride of aluminium and/or alloys thereof, an oxide of Ti, and/or an oxide of Zr;
a layer based on an oxide of Zn and Sn and/or an oxide of Sn,
a separation layer based on a metal oxide and/or an (oxi)nitride of silicon and/or an (oxi)nitride of aluminium, and
a top layer based on an oxide of Zn.

3. The pane according to claim 1 , wherein the pane comprises more than one silver-based functional layer.

4. The pane according to claim 3 , wherein each silver-based functional layer is spaced apart from an adjacent silver-based functional layer by an intervening central anti-reflection layer.

5. The pane according to claim 1 , wherein the lower partial barrier layer of the barrier layer has a thickness of less than 5 nm.

6. The pane according to claim 1 , wherein the central partial barrier layer of the barrier layer has a thickness of less than 5 nm.

7. The pane according to claim 1 , wherein the central partial barrier layer of the barrier layer has a thickness of less than 4 nm.

8. The pane according to claim 1 , wherein the upper partial barrier layer of the barrier layer has a thickness of less than 10 nm.

9. The pane according to claim 1 , wherein the barrier layer has a total thickness of at most 12 nm.

10. The pane according to claim 1 , wherein the lower, central and upper partial barrier layers of the barrier layer are based on essentially stoichiometric metal oxides.

11. The pane according to claim 1 , wherein the lower partial barrier layer of the barrier layer is based on an oxide of Zn and/or an oxide of Ti.

12. The pane according to claim 1 , wherein the central partial barrier layer of the barrier layer is based on an oxide of Zn, an oxide of Ti and/or an oxide of Zn and Sn.

13. The pane according to claim 1 , wherein the upper partial barrier layer of the barrier layer is based on an oxide of Zn and/or an oxide of Ti.

14. The pane according to claim 1 , wherein the upper anti-reflection layer comprises, in sequence from the barrier layer,
a layer based on an (oxi)nitride of aluminium and/or an (oxi)nitride of silicon, and
a layer based on a metal oxide.

15. The pane according to claim 14 , wherein the layer based on an (oxi)nitride of aluminium and/or an (oxi)nitride of silicon in the upper anti-reflection layer has a thickness of from 10 to 30 nm.

16. The pane according to claim 14 , wherein the layer based on a metal oxide in the upper anti-reflection layer has a thickness of from 2 to 20 nm.

17. A method of manufacturing a coated glass pane in accordance with claim 1 ,
wherein any portion of the lower partial barrier layer that is in direct contact with the silver-based functional layer is deposited by sputtering in an atmosphere with no or up to 5 vol. % oxygen.

18. The method according to claim 17 , wherein both the lower and the upper partial barrier layers are deposited by non-reactive sputtering, and wherein the central partial barrier layer is deposited by reactive sputtering.

19. A multiple glazing incorporating a pane in accordance with claim 1 .

20. The pane according to claim 1 , wherein the pane has a visible light transmittance of above 86%.

Assignees

• Mcsporran Neil
• Hughes Monica Joscelyn
• Clarke Gregory Charles Bernard
• Pilkington Group Ltd

Inventors

• Mcsporran Neil
• Hughes Monica Joscelyn
• Clarke Gregory Charles Bernard

Classifications

• C03C17/3681

  the multilayer coating being used in glazing, e.g. windows or windscreens · CPC title

• C03C2217/78

  Coatings specially designed to be durable, e.g. scratch-resistant · CPC title

• C03C17/36

  at least one coating being a metal · CPC title

• C03C17/3644 Primary

  the metal being silver · CPC title

• Y10T428/24975

  No layer or component greater than 5 mils thick · CPC title