Silver-free low-E solar control coating

• US RE43,388 E1
• Filed: 07/25/2006
• Issued: 05/15/2012
• Est. Priority Date: 07/26/2005
• Status: Expired due to Fees

• Current Assignee: Pilkington North America Incorporated (Pilkington PLC)
• Original Assignee: Pilkington North America Incorporated (Pilkington PLC)
• Inventors: Strickler, David A., Varanasi, Srikanth
• Primary Examiner(s): Blackwell, Gwendolyn
• Application Number:
  US13/134,737
• Time in Patent Office: 2,121 Days
• Field of Search: 428/428, 428/432, 428/689, 428/697, 428/698, 428/699, 428/701, 428/702
• US Class Current: 428/432
• CPC Class Codes: C03C 17/3417 all coatings being oxide coatings
• CPC Class Codes: C03C 17/3435 comprising a nitride, oxynitride, boronitride or carbonitride

Abstract

A multi-layer, low-emissivity, solar control article comprises a dielectric substrate, a first dielectric metal oxide layer deposited on the substrate, a first highly conductive, silver-free metal oxide layer deposited on the first dielectric metal oxide, and a second dielectric metal oxide deposited on the first highly conductive, silver-free metal oxide layer. The aforementioned coating layer sequence may be repeated as necessary to achieve the desired properties. An iridescence suppressing interlayer may, optionally, be utilized in connection with the low-emissivity, solar control coating.

Claims

1. A coated glass article comprising:

a dielectric substrate;

a first dielectric metal oxide layer deposited over the dielectric substrate, the first dielectric metal oxide layer comprising an oxide of tin or titanium;

a first highly conductive silver free metal oxide layer deposited over the first dielectric metal oxide, the highly conductive metal oxide comprising an oxide of rhenium or ruthenium, having a thickness <

1,000 Å and

an electrical conductivity greater than 10,000 ohm<sup>−

1</sup> cm<sup>−

1</sup>; and

a second dielectric metal oxide layer deposited over the conductive, silver-free metal oxide layer, the second dielectric metal oxide layer comprising an oxide of tin or titanium;

wherein the coated glass article has an emissivity of less than 0.3, a visible light transmittance >

70%, and a total solar energy transmittance of <

60%.

2. The solar control coating defined in claim 1, wherein the first highly conductive metal oxide has an electrical conductivity greater than 50,000 ohm⁻

1 cm<sup>−

1</sup>.

3. The solar control coating defined in claim 1, wherein a second highly conductive silver-free metal oxide layer comprising an oxide of rhenium or ruthenium is deposited over the second dielectric metal oxide layer, and a third dielectric metal oxide layer comprising an oxide of tin or titanium is deposited over the second highly conductive silver-free metal oxide layer.

4. The coated glass article defined in claim 1, wherein the emissivity is <

0.1.

5. The coated glass article defined in claim 1, wherein the highly conductive metal oxide comprises an oxide of ruthenium.

6. The coated glass article defined in claim 5, wherein:

the first dielectric metal oxide layer comprises SnO₂;

the first highly conductive silver free metal oxide layer comprises RuO₂; and

the second dielectric metal oxide layer comprises SnO₂.

7. The coated glass article defined in claim 5, wherein:

the first dielectric metal oxide layer comprises TiO₂;

the first highly conductive silver free metal oxide layer comprises RuO₂; and

the second dielectric metal oxide layer comprises TiO₂.

8. The coated glass article defined in claim 1, wherein the highly conductive metal oxide comprises an oxide of rhenium.

9. The coated glass article defined in claim 8, wherein:

the first dielectric metal oxide layer comprises TiO₂;

the first highly conductive silver free metal oxide layer comprises ReO₃; and

the second dielectric metal oxide layer comprises TiO₂.