Low-emissivity coating having low solar reflectance

• US 7,758,915 B2
• Filed: 04/28/2006
• Issued: 07/20/2010
• Est. Priority Date: 04/29/2002
• Status: Active Grant

• Current Assignee: Cardinal CG Company (Cardinal Glass Industries Incorporated)
• Original Assignee: Cardinal CG Company (Cardinal Glass Industries Incorporated)
• Inventors: Hoffman, Wayne L.
• Primary Examiner(s): Meeks; Timothy H
• Assistant Examiner(s): BURKHART, ELIZABETH A
• Application Number:
  US11/413,775
• Publication Number:
  US 20060193976A1
• Time in Patent Office: 1,544 Days
• Field of Search: 427/162, 427/164, 427/165, 427/166, 428432-434, 428/699, 428701-702
• US Class Current: 427/165
• CPC Class Codes: C03C 17/002 for flat glass, e.g. float glass
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• CPC Class Codes: C03C 17/3615 Coatings of the type glass/metal/other inorganic layers, at least one layer being non-metallic
• 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 17/3631 one layer at least containing a selenide or telluride
• 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 17/3649 made of metals other than 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: C03C 2217/78 Coatings specially designed to be durable, e.g. scratch-resistant
• CPC Class Codes: G02B 5/282 reflecting for infrared and transparent for visible light, e.g. heat reflectors, laser protection
• CPC Class Codes: Y10T 428/265 1 mil or less

Abstract

The invention provides low solar reflectance, low-emissivity coatings. The invention also provides a pane bearing a low solar reflectance, low-emissivity coating. Further, the invention provides an insulating glass unit comprising first and second panes held in a spaced-apart configuration, wherein the panes have confronting inner surfaces oriented toward a between-pane space and opposed outer surfaces oriented away from the between-pane space, and wherein one of these inner surfaces bears a low solar reflectance, low-emissivity coating. Also provided are methods of producing coated substrates.

Claims

1. A method of producing coated substrates, the method comprising:

a) providing a pane having generally-opposed first and second major surfaces; and

b) depositing upon one of said major surfaces a low-emissivity coating comprising in sequence outwardly from the pane, an inner coat, a high absorption primary layer, a middle coat, and an infrared-reflective layer, the inner coat being deposited directly onto the pane, wherein said infrared-reflective layer comprises material that is highly reflective of infrared radiation, the high absorption primary layer comprises material that is highly absorptive of solar radiation and includes at least about 100 angstroms of film, the inner coat comprises at least one transparent dielectric film and has an optical thickness, the middle coat comprises at least one transparent dielectric film and has an optical thickness of between about 600 angstroms and about 1,800 angstroms, and wherein the coating has a ratio defined as the optical thickness of the inner coat divided by the optical thickness of the middle coat, said ratio being between about 0.15 and about 0.32.

2. The method of claim 1 wherein the infrared-reflective layer is deposited as a silver-containing film.

3. The method of claim 1 wherein the infrared-reflective layer is deposited as a film having a thickness of at least about 50 angstroms.

4. The method of claim 1 wherein the high absorption primary layer is deposited as a titanium-containing film.

5. The method of claim 4 wherein the high absorption primary layer is deposited as metallic titanium.

6. The method of claim 1 further comprising depositing a high absorption blocker layer between the infrared-reflective layer and the inner coat.

7. The method of claim 6 wherein the high absorption blocker layer is deposited as a titanium-containing film.

8. A method of producing coated substrates, the method comprising:

a) providing a pane having generally-opposed first and second major surfaces; and

b) depositing upon one of said major surfaces a low-emissivity coating comprising the following sequence of films;

i) an inner coat comprising at least one transparent dielectric film, the inner coat being deposited directly on the pane;

ii) a high absorption primary layer comprising material that is highly absorptive of solar radiation, the high absorption primary layer including at least about 100 angstroms of film;

iii) a middle coat comprising at least one transparent dielectric film and having an optical thickness of between about 600 angstroms and about 1,800 angstroms;

iv) an infrared-reflective layer comprising material that is highly reflective of infrared radiation;

v) a high absorption blocker layer comprising material that is highly absorptive of solar radiation, the high absorption blocker layer being deposited directly over the infrared-reflective layer; and

vi) an outer coat comprising at least one transparent dielectric film.

9. The method of claim 8 wherein the infrared-reflective layer is deposited as a silver-containing film.

10. The method of claim 8 wherein the infrared-reflective layer is deposited as a film having a thickness of at least about 50 angstroms.

11. The method of claim 8 wherein the high absorption primary layer is deposited as a titanium-containing film.

12. The method of claim 11 wherein the high absorption primary layer is deposited as metallic titanium.

13. The method of claim 8 wherein the high absorption blocker layer is deposited as a titanium-containing film.

14. The method of claim 13 wherein the high absorption blocker layer is deposited as metallic titanium.

15. A method of producing coated substrates, the method comprising:

a) providing a pane having generally-opposed first and second major surfaces; and

b) depositing upon one of said major surfaces a low-emissivity coating comprising the following sequence of films;

i) an inner coat comprising at least one transparent dielectric film;

ii) a high absorption primary layer comprising material that is highly absorptive of solar radiation, the high absorption primary layer including at least 100 angstroms of film;

iii) a middle coat comprising a titanium dioxide film sandwiched between two zinc oxide films;

iv) an infrared-reflective layer comprising material that is highly reflective of infrared radiation;

v) a high absorption blocker layer comprising material that is highly absorptive of solar radiation, the high absorption blocker layer including at least about 75 angstroms of film; and

vi) an outer coat comprising at least one transparent dielectric film.

16. A method of producing coated substrates, the method comprising:

a) providing a pane having generally-opposed first and second major surfaces; and

b) depositing upon one of said major surfaces a low-emissivity coating comprising the following sequence of films;

i) an inner coat comprising at least one transparent dielectric film;

ii) a high absorption primary layer comprising material that is highly absorptive of solar radiation, the high absorption primary layer including at least about 100 angstroms of film;

iii) a middle coat comprising at least one transparent dielectric film, wherein the middle coat has an optical thickness of between about 600 angstroms and about 1,800 angstroms;

iv) an infrared-reflective layer comprising silver;

v) a high absorption blocker layer comprising material that is highly absorptive of solar radiation, the high absorption blocker layer being deposited directly over the infrared-reflective layer; and

vi) an outer coat comprising at least one transparent dielectric film, wherein the outer coat forms the outermost film region of the coating, wherein the pane is part of an insulating glass unit and the low-emissivity coating is carried on a #2 surface of the insulating glass unit;

said insulating glass unit having an exterior solar reflectance of less than about 20% and having a transmitted color characterized by an a_h color coordinate and a b_h color coordinate, both of said color coordinates being negative.

17. The method of claim 16 wherein the infrared-reflective layer is deposited as a film having a thickness of at least about 50 angstroms.

18. The method of claim 16 wherein the high absorption primary layer is deposited as a titanium-containing film.

19. The method of claim 18 wherein the high absorption primary layer is deposited as metallic titanium.

20. The method of claim 16 wherein the high absorption blocker layer is deposited as a titanium-containing film.

21. The method of claim 20 wherein the high absorption blocker layer is deposited as metallic titanium.

22. A method of producing coated substrates, the method comprising:

A) providing a pane having generally-opposed first and second major surfaces; and

b) depositing upon one of said major surfaces a low-emissivity coating comprising the following sequence of films;

i) an inner coat comprising at least one transparent dielectric film and having an optical thickness, the inner coat being deposited directly on the pane;

ii) a high absorption primary layer comprising material that is highly absorptive of solar radiation, the high absorption primary layer including at least about 100 angstroms of film;

iii) a middle coat comprising at least one transparent dielectric film and having an optical thickness;

iv) an infrared-reflective layer comprising silver;

v) a high absorption blocker layer comprising material that is highly absorptive of solar radiation, the high absorption blocker layer being deposited directly over the infrared-reflective layer; and

vi) an outer coat comprising at least one transparent dielectric film, wherein the outer coat forms the outermost film region of the coating,

wherein the coating has a ratio defined as the optical thickness of the inner coat divided by the optical thickness of the middle coat, said ratio being between about 0.15 and 0.32;

wherein the pane is part of an insulating glass unit and the low-emissivity coating is carried on a #2 surface of the insulating glass unit; and

wherein the insulating glass unit has an exterior solar reflectance of less than about 20% and a transmitted color characterized by an a_h color coordinate and a b_h color coordinate, both of said color coordinates being negative.