Coatings on substrates

• US 6,840,061 B1
• Filed: 06/06/2000
• Issued: 01/11/2005
• Est. Priority Date: 06/08/1999
• Status: Expired due to Term

• Current Assignee: Pilkington PLC
• Original Assignee: Libbey-Owens-Ford Co. (Eaton Corporation PLC.), Pilkington PLC
• Inventors: Ammerlaan, Johannes Andreas Maria, Hurst, Simon James, McCurdy, Richard Joseph
• Primary Examiner(s): VINCENT, SEAN E
• Application Number:
  US09/587,970
• Time in Patent Office: 1,680 Days
• Field of Search: 65/605, 65/605.1, 65/605.2, 65/605.3, 65/991, 65/994
• US Class Current: 65/60.51
• CPC Class Codes: C03C 17/2456 Coating containing TiO2
• CPC Class Codes: C03C 17/3417 all coatings being oxide coatings
• CPC Class Codes: C03C 2217/212 TiO2
• CPC Class Codes: C03C 2217/71 Photocatalytic coatings
• CPC Class Codes: C03C 2218/152 by cvd
• CPC Class Codes: C23C 16/405 of refractory metals or yttrium

Abstract

A process for the production of a photocatalytically active self-cleaning coated substrate, especially a glass substrate, which comprises depositing a titanium oxide coating on the surface of the substrate by contacting it with a fluid mixture containing a source of titanium and a source of oxygen, the substrate being at a temperature of at least 600° C. The coated surface has good durability, a high photocatalytic activity and a low visible light reflection. Most preferably the deposition temperature is in the range 645° C. to 7200° C. which provides especially good durability. The fluid mixture preferably contains titanium chloride and an ester, especially ethyl acetate. Also disclosed is a self cleaning coated substrate, especially a glass substrate, having high photocatalytic activity and low visible light reflection and a durable self-cleaning coated glass.

Claims

1. A process for the production of a durable photocatalytically active coated glass which comprises depositing a photocatalytically active titanium oxide layer on the surface of a glass ribbon formed during a float glass production process, said layer having a thickness of 30 nm or less and a photoactivity of greater than 5×

10<sup>−

3</sup> cm<sup>−

1</sup> min<sup>−

1</sup>, by contacting the surface of the ribbon with a gaseous mixture comprising a source of titanium while the ribbon is at a temperature of from 625°

to 720°

C.

2. A process as claimed in claim 1 wherein the ribbon is at a temperature in the range 670°

C. to 720°

C.

3. A process as claimed in claim 1 wherein the gaseous mixture comprises titanium tetraethoxide as the source of titanium.

4. A process as claimed in claim 1 wherein the gaseous mixture comprises titanium chloride as the source of titanium and an ester other than a methyl ester.

5. A process as claimed in claim 4 wherein the ester comprises an alkyl ester having an alkyl group with a β

hydrogen.

6. A process as claimed in claim 4 wherein the ester comprises a carboxylate ester.

7. A process as claimed in claim 4 wherein the ester is an alkyl ester having a C₂ to C₄ alkyl group.

8. A process as claimed in claim 7 wherein the ester comprises an ethyl ester.

9. A process as claimed in claim 8 wherein the ester comprises ethyl acetate.

10. A process as claimed in claimed in claim 4 wherein the ester is the only source of oxygen in the fluid mixture.

11. A process as claimed in claim 1 wherein the process is performed at substantially atmospheric pressure.