Coating composition with solar properties

• US 7,473,471 B2
• Filed: 03/21/2005
• Issued: 01/06/2009
• Est. Priority Date: 03/21/2005
• Status: Active Grant

• Current Assignee: Vitro Flat Glass LLC (Compagnie De Saint-Gobain)
• Original Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Inventors: Thiel, James P., Finley, James J., Buhay, Harry
• Primary Examiner(s): Speer; Timothy M
• Application Number:
  US11/084,989
• Publication Number:
  US 20060210809A1
• Time in Patent Office: 1,387 Days
• Field of Search: None
• US Class Current: 428/432
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• 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

Abstract

A coating composition is disclosed. The coating composition includes an infrared reflective layer; a primer layer over the infrared reflective layer; a dielectric layer over the primer layer; and an absorbing layer, wherein the absorbing layer can be either under the infrared reflective layer or over the dielectric layer.

Claims

1. A coating comprising:

a. an infrared reflective layer;

b. a primer layer over the infrared reflective layer;

c. a dielectric layer over the primer layer; and

d. an absorbing layer;

wherein the absorbing layer can be either under the infrared reflective layer or over the dielectric layer;

wherein the absorbing layer comprises an alloy and/or mixture of (a) a metal having an index of refraction at 500 nm less than or equal to 1.0 and (b) a material having a Δ

G°

_f of greater than or equal to −

100 at 1,000°

K; and

wherein the metal is silver and the material is tin.

2. The coating according to claim 1, wherein the absorbing layer is deposited using a method selected from CVD spray pyrolysis, and MSVD.

3. The coating according to claim 1, wherein the absorbing layer has a thickness ranging from 20 Å

to 300 Å

.

4. The coating according to claim 1, wherein the dielectric layer comprises a material selected from metal oxides, oxides of metal alloys, nitrides, oxynitrides, and mixtures thereof.

5. The coating according to claim 4, wherein the dielectric layer comprises a metal oxide selected from an oxide of titanium, hafnium, zirconium, niobium, zinc, bismuth lead, indium, tin, and mixtures thereof.

6. The coating according to claim 4, wherein the dielectric layer comprises a zinc/tin alloy oxide ranging from 10 wt. % to 90 wt. % zinc and 90 wt. % to 10 wt. % tin.

7. The coating according to claim 1, wherein the infrared reflective layer comprises a material selected from silver, gold and copper.

8. The coating according to claim 1 deposited on a 0.16 inch thick clear glass substrate wherein the substrate exhibits an Lta of less than or equal to 50% and an L* of equal to or less than 52 from at least one side of the substrate.