Glazing panel

• US 6,699,585 B2
• Filed: 06/18/2001
• Issued: 03/02/2004
• Est. Priority Date: 12/18/1998
• Status: Expired due to Fees

• Current Assignee: Asahi Glass Company, Limited (AGC, Inc.)
• Original Assignee: Asahi Glass Company, Limited (AGC, Inc.)
• Inventors: Aomine, Nobutaka, Takeda, Satoshi, Ebisawa, Junichi, Decroupet, Daniel, Noda, Kazuyoshi
• Primary Examiner(s): Jones; Deborah
• Assistant Examiner(s): Piziali; Andrew T
• Application Number:
  US09/881,754
• Publication Number:
  US 20020034641A1
• Time in Patent Office: 988 Days
• Field of Search: 428/426,428,432,336,469,472,615,622,673,698,699,701,702 359/359,585
• US Class Current: 428/432
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• CPC Class Codes: C03C 17/3618 Coatings of type glass/inorganic compound/other inorganic layers, at least one layer being metallic
• CPC Class Codes: C03C 17/3626 one layer at least containing a nitride, oxynitride, boronitride or carbonitride
• CPC Class Codes: C03C 17/3639 Multilayers containing at least two functional metal layers
• CPC Class Codes: C03C 17/3642 the multilayer coating containing a metal layer
• CPC Class Codes: C03C 17/3644 the metal being silver
• CPC Class Codes: C03C 17/3647 in combination with other metals, silver being more than 50%
• CPC Class Codes: C03C 17/3652 the coating stack containing at least one sacrificial layer to protect the metal from oxidation
• CPC Class Codes: C03C 17/3681 the multilayer coating being used in glazing, e.g. windows or windscreens
• CPC Class Codes: Y10T 428/12493 Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
• CPC Class Codes: Y10T 428/12896 Ag-base component
• CPC Class Codes: Y10T 428/265 1 mil or less

Abstract

A glazing panel carrying a coating stack comprises in sequence at least:

a glass substrate

a base antireflective layer

an infra-red reflecting layer, and

a top antireflective layer

in which at least one of the antireflective layers comprises at least one mixed nitride layer which is a mixture of Al and at least one additional material X, in which the atomic ratio X/Al is greater than or equal to 0.05 and in which X is one or more of the materials selected from the group comprising the elements of Groups 3a, 4a, 5a, 4b, 5b, 6b, 7b, 8 of the periodic table. The glazing panel is particularly suitable for heat treatment and incorporation in windscreens.

Claims

1. A glazing panel carrying a coating stack comprising in sequence at least:

a glass substrate

a base antireflective layer

an infra-red reflecting layer, and

a top antireflective layer

characterised in that at least one of the antireflective layers comprises at least one mixed nitride layer which is a mixture of Al and at least one additional material X, in which the atomic ratio X/Al is greater than or equal to 0.05 and in which X is one or more of the materials selected from the group comprising the elements of Groups 3a, 4a, 5a, 4b, 5b, 6b, 7b, 8 of the periodic table and that the infra-red reflecting layer comprises Ag as the main component and Pd, wherein the Pd content as Pd/Ag is from 0.3 to 11.1 at %.

2. A glazing panel in accordance with claim 1, in which X is one or more of the materials selected from the group comprising Si, Zr, Hf, Ti, Nb and B.

3. A glazing panel in accordance with claim 1, in which the glazing panel is a heat treatable or substantially haze free heat treated glazing panel.

4. A glazing panel in accordance with claim 1, in which each of the base antireflective layer and the top antireflective layer comprises at least one mixed nitride layer which is a mixture of Al and at least one additional material X, in which the atomic ratio X/AI is greater than or equal to 0.05 and in which X is one or more of the materials selected from the group comprising the elements of Groups 3a, 4a, 5a, 4b, 5b, 6b, 7b, 8 of the periodic table.

5. A glazing panel in accordance with claim 1, in which the glazing panel is a heat treatable or substantially haze free heat treated glazing panel and in which heat treatment of the heat treatable glazing panel to form the substantially haze free heat treated glazing panel provokes an increase of the value of TL of the glazing panel of at least 2.5%.

6. A method of manufacturing a glazing panel having a haze of less than about 0.5 comprising the step of subjecting a glazing panel in accordance with claim 1 a heat treatment process at least 57°

C.

7. A glazing panel in accordance with claim 1 comprising in sequence at least:

a glass substrate

a base antireflective layer

an infra-red reflecting layer

a central antireflective layer

an infra-red reflecting layer

a top antireflective layer

characterised in that at least one of the antireflective layers comprises at least one mixed nitride layer which is a mixture of Al and at least one additional material X, in which the atomic ratio X/Al is greater than or equal to 0.05 and in which X is one or more of the materials selected from the group comprising the elements of Groups 3a, 4a, 5a, 4b, 5^b, 6b, 7b, 8 of the periodic table; and

at least one of the infra-red reflecting layer contains Ag as the main component and Pd, wherein the Pd, wherein the Pd content as Pd/Ag is from 0.3 to 11.1 at%.

8. A glazing panel in accordance with claim 7, in which the at least one mixed nitride layer has a geometrical thickness greater than or equal to than 30 Å

.

9. A glazing panel in accordance with claim 7, in which the at least one mixed nitride layer has a geometrical thickness less than 195 Å

.

10. A glazing panel in accordance with claim 7, in which the at least one mixed nitride layer has a geometrical thickness of less than 100 Å

and forms at least part of the top antireflective layer.

11. A glazing panel in accordance with claim 7, in which the central antireflective layer comprises at least one mixed nitride layer which is a mixture of Al and at least one additional material X, in which the atomic ration X/AI is greater than or equal to 0.05 and in which X is one or more of the materials selected from the group comprising the elements of Groups 3a, 4a, 5a, 4b, 5b, 6b, 7b, 8 of the periodic table.

12. A glazing panel in accordance with claim 7, in which the atomic ratio X/Al of the mixed nitride layer is within the range 0.05-20.

13. A glazing panel in accordance with claim 7, in which the atomic ratio X/AI of the mixed nitride layer is withing the range 0.2-4.

14. A glazing panel in accordance with claim 7, in which in which the atomic ratio X/Al of the mixed nitride layer is withing the range 0.4-3.5.

15. A glazing panel in accordance with claim 7, in which the base antireflective layer comprises

a layer adjacent to the substrate comprising the mixed nitride layer, and an overlying layer comprising the at least one mixed oxide layer which comprises an oxide which is a mixture of Zn and at least one additional material X, in which the atomic ratio X/Zn is greater than or equal to 0.03 and in which X is one or more of the materials selected from the group comprising the elements of Groups 2a, 3a, 5a, 4b, 5b, 6b of the periodic table.

16. A glazing panel in accordance with claim 7, in which the top anitreflective layer comprises

the at least one mixed oxide layer which comprises an oxide which is a mixture of Zn and at least one additional material X, in which the atomic ratio X/Zn is greater than or equal to 0.03 and in which X is one or more of the materials selected from the group comprising the elements of Groups 2a, 3a, 5a, 4b, 5b, 6b of the periodic table, and

an overlying layer comprising the mixed nitride layer.