Low emissivity coatings with increased ultraviolet transmissivity

• US 10,618,839 B2
• Filed: 11/30/2017
• Issued: 04/14/2020
• Est. Priority Date: 11/30/2016
• Status: Active Grant

• Current Assignee: Corning Incorporated
• Original Assignee: Corning Incorporated
• Inventors: Bellman, Robert Alan, Koch, III, Karl William
• Primary Examiner(s): Colgan, Lauren R
• Application Number:
  US15/827,256
• Publication Number:
  US 20180148372A1
• Time in Patent Office: 866 Days
• Field of Search: 428426, 428428, 428432, 428434, 428688, 428433
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• 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 17/3649 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 2217/216 ZnO
• CPC Class Codes: C03C 2217/256 Ag
• CPC Class Codes: C03C 2217/258 Ti, Zr, Hf
• CPC Class Codes: C03C 2217/281 Nitrides
• CPC Class Codes: C03C 2218/156 by magnetron sputtering
• CPC Class Codes: E06B 3/6715 specially adapted for increased thermal insulation or for controlled passage of light E06B3/66323 takes precedence; coating of glass pains C03C17/00; devices or arrangements for controlling the intensity, colour, phase, polarisation or direction of light G02F1/00
• 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 5/282 reflecting for infrared and transparent for visible light, e.g. heat reflectors, laser protection
• CPC Class Codes: G02B 5/283 designed for the ultraviolet

Abstract

A coated article including a substrate and a low emissivity coating. The coated article includes increased T_UV and/or actinic transmissivity for use in windows and similar applications.

Claims

1. A coated article comprising a low emissivity coating and a substrate, the low emissivity coating comprising:

at least one dielectric layer; and

at least one metal layer;

wherein the coated article has a transmission of greater than or equal to 50% over a range of actinic wavelengths from the solar spectrum, wherein the actinic wavelengths are from 350 nm to 420 nm, and a transmission of less than or equal to 20% over a range of wavelengths from 751 nm to 2700 nm.

2. The coated article of claim 1 wherein the coated article has a transmission of from about 1% to about 20% over a range of wavelengths from 320 nm to 350 nm.

3. The coated article of claim 1 wherein the coated article has a transmission of at least 70% over a range of wavelengths from 350 nm to 420 nm from the solar spectrum.

4. The coated article of claim 1 wherein the substrate comprises a glass, a ceramic, or a glass ceramic.

5. The coated article of claim 1 wherein the substrate and low emissivity coating are a neutral color or substantially colorless.

6. The coated article of claim 1 wherein the low-emissivity coating comprises at least two metal layers.

7. The coated article of claim 6 wherein the at least two metal layers are separated by the at least one dielectric layer.

8. The coated article of claim 1 wherein the at least one metal layer and the at least one dielectric layer are separated by an optional layer.