SOLAR CONTROL GLAZING

• US 20130059137A1
• Filed: 05/25/2011
• Published: 03/07/2013
• Est. Priority Date: 05/25/2010
• Status: Active Grant

• Current Assignee: AGC Glass Europe SA (AGC, Inc.)
• Original Assignee: AGC Glass Europe SA (AGC, Inc.)
• Inventors: Hevesi, Kadosa, Sicha, Jan
• Granted Patent: US 9,709,717 B2
• Time in Patent Office: Days
• US Class Current: 428/213
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: B32B 17/10229 Metallic layers sandwiched by dielectric layers
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• CPC Class Codes: C03C 17/3613 Coatings of type glass/inorganic compound/metal/inorganic compound/metal/other
• 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 17/3644 the metal being silver
• 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 17/366 Low-emissivity or solar control coatings
• CPC Class Codes: C03C 17/3681 the multilayer coating being used in glazing, e.g. windows or windscreens
• CPC Class Codes: G02B 5/0858 the reflecting layers comprising a single metallic layer with one or more dielectric layers
• 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: Y10T 428/2495 Thickness [relative or absolute]

Abstract

The present invention relates to a substrate carrying a multilayer solar control stack, as well as to a multiple glazing incorporating at least one such sheet of glassy material carrying a solar control stack. The multilayer solar control stack comprises three functional layers based on a material which reflects infrared radiation and four dielectric coatings such that each functional layer is surrounded by dielectric coating. The geometrical thickness of the second functional layer starting from the substrate is less by at least 4% than the geometrical thicknesses of the first and third functional layers. The invention applies particularly to the formation of high-selectivity solar control glazings.

Claims

1. A transparent substrate comprising a solar-control multilayer stack comprising three functional layers comprising a material that reflects infrared radiation and four dielectric coatings, such that each functional layer is surrounded by dielectric coatings,

wherein the geometric thickness of the second functional layer starting from the substrate is at least 4% less than the geometric thicknesses of the first and third functional layers.

2. The transparent substrate of claim 1, wherein the geometric thickness of the second functional layer starting from the substrate is at least 8% less than the geometric thickness of the third functional layer.

3. The transparent substrate of claim 1, wherein the geometric thickness of the second functional layer starting from the substrate is at least 8% less than the geometric thicknesses of the first and third functional layers.

4. The transparent substrate of claim 1, wherein the geometric thickness of the second functional layer starting from the substrate is at least 15% less than the geometric thickness of the third functional layer.

5. The transparent substrate of claim 1, wherein the ratio of the optical thickness of the dielectric coating positioned between the second and the third functional layers to the optical thickness of the final dielectric coating positioned beyond the third functional layer starting from the substrate is between 1.3 and 2.6.

6. The transparent substrate of claim 5, wherein the ratio of the optical thickness of the dielectric coating positioned between the second and the third functional layers to the optical thickness of the final dielectric coating positioned beyond the third functional layer starting from the substrate is between 1.5 and 2.1.

7. The transparent substrate of claim 1, wherein the ratio of the optical thickness of the dielectric coating positioned between the second and third functional layer to the geometric thickness of the third functional layer starting from the substrate is between 5.5 and 10.

8. The transparent substrate of claim 1, wherein the ratio of the optical thickness of the dielectric coating positioned between the substrate and the first functional layer to the optical thickness of the last dielectric coating positioned beyond the third functional layer is between 0.5 and 2.7.

9. The transparent substrate of claim 8, wherein the ratio of the optical thickness of the dielectric coating positioned between the substrate and the first functional layer to the optical thickness of the last dielectric coating positioned beyond the third functional layer is between 0.8 and 2.

10. The transparent substrate of claim 1, wherein the ratio of the optical thickness of the third dielectric coating D3 to the optical thickness of the second dielectric coating D2 positioned between the first functional layer starting from the substrate and the second functional layer is between 0.4 and 1.1.

11. The transparent substrate of claim 1, wherein the ratio of the optical thickness of the second dielectric coating D2 to the optical thickness of the first dielectric coating D1 is between 1.15 and 3.4.

12. The transparent substrate of claim 1, wherein the stack comprises an absorbent layer such that, when the stack is deposited on a sheet of standard clear glass having a thickness of 6 mm, the total light absorption A_L of the glass bearing the stack, measured on the substrate side, is at least 25%.

13. A multiple glazing, comprising

the transparent substrate of claim 1.

14. The multiple glazing of claim 13, having:

a solar factor between 14 and 36%;

a light transmission between 38 and 69%;

an external light reflection, on the glass side of the coated glass sheet, between 7 and 25%; and

a color in external reflection for which the value b* is less than or equal to a* and for which the angular variation of a* between 0° and

55°

is between −

3.6 and 2.

15. A laminated glazing, comprising:

the transparent substrate of claim 1 joined to a sheet comprising a glassy material with an adhesive plastic.

16. The transparent substrate of claim 1, wherein the ratio of the optical thickness of the dielectric coating positioned between the second and third functional layer to the geometric thickness of the third functional layer starting from the substrate is between 7 and 9.

17. The transparent substrate of claim 1, wherein the ratio of the optical thickness of the dielectric coating positioned between the substrate and the first functional layer to the optical thickness of the last dielectric coating positioned beyond the third functional layer is between 1.3 and 2.3.

18. The transparent substrate of claim 1, wherein the ratio of the optical thickness of the second dielectric coating D2 to the optical thickness of the first dielectric coating D1 is between 1.6 and 2.1.

19. The transparent substrate of claim 1, wherein the stack comprises an absorbent layer such that, when the stack is deposited on a sheet of standard clear glass having a thickness of 6 mm, the total light absorption A_L of the glass bearing the stack, measured on the substrate side, is at least 30%.

20. The transparent substrate of claim 1, wherein the stack comprises an absorbent layer such that, when the stack is deposited on a sheet of standard clear glass having a thickness of 6 mm, the total light absorption A_L of the glass bearing the stack, measured on the substrate side, is at least 33%.