Coated article

• US 20050238861A1
• Filed: 06/17/2005
• Published: 10/27/2005
• Est. Priority Date: 10/24/2000
• Status: Abandoned Application

• Current Assignee: Harry Buhay, James J. Finley, James P. Thiel, John P. Lehan
• Original Assignee: Harry Buhay, James J. Finley, James P. Thiel, John P. Lehan
• Inventors: Thiel, James P., Finley, James J., Buhay, Harry, Lehan, John P.
• Application Number:
  US11/085,330
• Publication Number:
  US 20050238861A1
• Time in Patent Office: Days
• US Class Current: 428/212
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: B32B 17/10174 Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
• CPC Class Codes: B32B 17/10761 containing vinyl acetal
• CPC Class Codes: C03C 17/3417 all coatings being oxide coatings
• 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 17/3639 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: C03C 17/38 at least one coating being a coating of an organic material
• CPC Class Codes: C03C 17/42 at least one coating of an organic material and at least one non-metal coating
• CPC Class Codes: C23C 14/08 Oxides C23C14/10 takes precedence
• CPC Class Codes: C23C 14/5806 Thermal treatment
• CPC Class Codes: G02B 5/0858 the reflecting layers comprising a single metallic layer with one or more dielectric layers
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree

Abstract

A new article is disclosed. The article includes a a functional coating with a first emissivity value over at least a portion of a ply and a protective coating comprising 35 wt. % to 100 wt. % alumina and 0 wt. % to 65 wt. % silica and having a second emissivity value over at least a portion of the functional coating. The coating stack on the article has an emissivity value greater than the emissivity value of the functional coating.

Claims

1. A method of making a laminated article, comprising the steps of:

providing a first substrate having a major surface;

applying a functional coating having an emissivity value over at least a portion of the first substrate major surface;

applying a protective coating comprising 35 wt. % to 100 wt. % alumina and 0 wt. % to 65 wt. % silica over at least a portion of the functional coating to form a coating stack having an emissivity value greater than the emissivity value of the functional coating;

providing a second substrate;

heating the first and second substrates to desired shapes; and

laminating the first and second substrates together with an interlayer, with the protective coating facing the interlayer.

2. The method of claim 1, wherein the protective coating has a refractive index of less than 2.

3. The method of claim 1, wherein the protective coating has a refractive index about the same as the refractive index of the second substrate.

4. The method of claim 1, wherein the protective coating increases the emissivity of the coating stack to be in the range of 0.3 to 0.9.

5. The method of claim 1, wherein the protective coating increases the emissivity of the coating stack to greater than or equal to 0.5.

6. The method of claim 1, including adding a sufficient protective coating such that the emissivity of the coating stack is within 0.2 of the emissivity of the first substrate.

7. A method of making a coated article, comprising the steps of:

providing a coating having a predetermined infrared reflectance and a predetermined emissivity; and

altering the coating such that the emissivity increases but the infrared reflectance remains substantially the same.

8. A laminated article, comprising:

a first ply having a first major surface;

a functional coating over at least a portion of the first major surface and having an emissivity value;

a protective coating comprising 35 wt. % to 100 wt. % alumina and 0 wt. % to 65 wt. % silica over at least a portion of the functional coating to form a coating stack having an emissivity, the protective coating configured to increase the emissivity of the coating stack over the emissivity of the functional coating alone;

a second ply; and

an interlayer located between the first and second plies, with the protective coating facing the interlayer.

9. The article of claim 8, wherein the first and second plies are selected from glass, plastic, and ceramic material.

10. The article of claim 8, wherein the protective coating has a refractive index in the range of 1.5 to 2.0.

11. The article of claim 8, wherein the protective coating increases the emissivity of the coating stack to be in the range of 0.3 to 0.9.

12. An article, comprising:

a substrate;

a functional coating over at least a portion of the substrate; and

a protective coating comprising 35 wt. % to 100 wt. % alumina and 0 wt. % to 65 wt. % silica over the functional coating, wherein the functional coating and the protective coating define a coating stack and the protective coating provides the coating stack with an emissivity higher than the emissivity of the functional coating alone.

13. The article as claimed in claim 12, wherein the substrate is selected from glass, plastic, and ceramic.

14. The article as claimed in claim 12, wherein the article is an automotive transparency.

15. The article as claimed in claim 12, wherein the substrate has a thickness of 2 mm to 20 mm.

16. The article of in claim 12, wherein the functional coating has an emissivity of 0.1 or less.

17. The article of claim 12, wherein the protective coating increases the emissivity of the coating stack by at least a factor of two with respect to the emissivity of the functional coating.

18. The article of claim 12, wherein the protective coating increases the emissivity of the coating stack by a factor in the range of 2 to 20 compared to the emissivity of the functional coating.

19. The article as claimed in claim 12, wherein the functional coating has an emissivity of 0.1 or less and the coating stack has an emissivity of 0.5 or more.

20. The article as claimed in claim 12, wherein the emissivity of the coating stack is 0.5 to 0.8.

21. The article as claimed in claim 12, wherein the protective coating has a thickness of greater than 1 micron.

22. The article as claimed in claim 12, wherein the protective coating has a thickness of less than 5 microns.

23. The article as claimed in claim 12, wherein the protective coating comprises 86 wt. % to 90 wt. % alumina and 10 wt. % to 14 wt. % silica.

24. The article as claimed in claim 12, wherein the protective coating is solar absorbing in at least one of the UV, IR, or visible regions of the electromagnetic spectrum.

25. A monolithic automotive transparency, comprising:

a glass substrate;

a functional coating over at least a portion of the glass substrate; and

a protective coating over the functional coating to form a coating stack, the protective coating comprising 35 wt. % to 100 wt. % alumina and 0 wt. % to 65 wt. % silica having a thickness in the range of 1 micron to 5 microns and providing the coating stack with an emissivity of at least 0.5.

26. The transparency as claimed in claim 25, wherein the protective coating comprises 70 wt. % to 90 wt. % alumina and 10 wt. % to 30 wt. % silica.