Neutral reflecting coated articles with sputtered multilayer films of metal oxides

• US 4,902,580 A
• Filed: 10/21/1988
• Issued: 02/20/1990
• Est. Priority Date: 04/01/1988
• Status: Expired due to Term

• Current Assignee: PPG Industries Incorporated (Nouryon BV)
• Original Assignee: PPG Industries Incorporated (Nouryon BV)
• Inventors: Gillery, F. Howard
• Primary Examiner(s): Rutledge, L. Dewayne
• Assistant Examiner(s): Wyszomierski, George
• Application Number:
  US07/260,647
• Time in Patent Office: 487 Days
• Field of Search: 428/623, 428/630-633, 428/660, 428/673
• US Class Current: 428/623
• 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 17/3644 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 2217/734 comprising an alternation of high and low refractive indexes
• CPC Class Codes: C03C 2217/78 Coatings specially designed to be durable, e.g. scratch-resistant
• CPC Class Codes: G02B 1/10 Optical coatings produced by application to, or surface treatment of, optical elements G02B1/08 takes precedence
• CPC Class Codes: G02B 1/116 including electrically conducting layers
• CPC Class Codes: Y10T 428/12549 Adjacent to each other
• CPC Class Codes: Y10T 428/12597 Noncrystalline silica or noncrystalline plural-oxide component [e.g., glass, etc.]
• CPC Class Codes: Y10T 428/12618 Plural oxides
• CPC Class Codes: Y10T 428/12806 Refractory [Group IVB, VB, or VIB] metal-base component
• CPC Class Codes: Y10T 428/12896 Ag-base component

Abstract

A method for producing visually neutral high transmittance low emissivity coated articles comprising infrared reflective metal and antireflective metal oxide layers and an improved multiple layer coated article produced thereby comprising a high refractive index neutral metal oxide layer between the antireflective metal oxide layer and the infrared reflective metal layer are disclosed.

Claims

1. A visually neutral reflectance, high transmittance, low emissivity article comprising:

a. a transparent nonmetallic substrate;

b. a first transparent antireflective metal oxide film having a refractive index of about 2.0 deposited on a surface of said substrate;

c. a transparent metal oxide layer having a refractive index greater than 2.0 deposited on said first antireflective metal oxide film;

d. a transparent infrared reflective metallic film deposited on said metal oxide layer;

e. a transparent metal layer deposited on said infrared reflective metallic film; and

f. a second transparent antireflective metal oxide film deposited on said metal layer.

2. An article according to claim 1, wherein the substrate is glass.

3. An article according to claim 2, wherein the infrared reflective metallic film is silver.

4. An article according to claim 3, wherein the second antireflective metal oxide film comprises an oxide reaction product comprising zinc and tin.

5. An article according to claim 4, wherein the antireflective metal oxide comprises zinc stannate.

6. An article according to claim 1, wherein the metal oxide film deposited between the antireflective metal oxide film and the infrared reflective metallic film is selected from the group consisting of titanium oxide and zirconium oxide.

7. An article according to claim 6, wherein said metal oxide film comprises titanium oxide.

8. An article according to claim 7, wherein the titanium oxide layer has a thickness of about 50 to 100 Angstroms.

9. An article according to claim 8, wherein the metal layer deposited on the infrared reflective metallic film comprises titanium.

10. An article according to claim 9, further comprising a titanium oxide overcoat on the second antireflective metal oxide film.