Titania coatings
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Accused Products
Abstract
Photocatalytic titania coatings deposited by a CVD process using an organic titanium compound and an oxygen containing organic compound exhibit improved properties. They are more durable and smoother than existing coating and are less susceptible to scratching. The preferred titanium compound is titanium isopropoxide and the preferred organic compound is ethyl acetate.
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Citations
49 Claims
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1-26. -26. (canceled)
- 27. A chemical vapor deposition process for the deposition of a photocatalytically active coating comprising titanium oxide on the surface of a substrate, the process comprising contacting that surface with a vapor comprising titanium tetraethoxide or titanium tetraisopropoxide and a carboxylate ester at a temperature which is sufficiently high to form the titanium oxide coating.
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37. A photocatalytically active substrate having a titanium oxide coating on at least one surface thereof wherein the coated surface exhibits a photocatalytic activity of at least 50% (expressed as the percentage reduction of the integrated absorption peaks corresponding to a thin film of stearic acid produced by UVA irradiation at an intensity of 0.76 w/m2 for a period of 30 minutes) and is unaffected by immersion in 1 molar sodium hydroxide solution at 75°
- C. for a period of at least 6 hours.
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38. A photocatalytically active substrate having a titanium dioxide coating on at least one surface thereof wherein the coated surface has an Ra value of less than 2 nm and a photocatalytic activity of at least 50% (expressed as the percentage reduction of the integrated absorption peaks corresponding to a thin film of stearic acid produced by UVA irradiation at an intensity of 32 W/m2 for a period of 30 minutes).
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39. A photocatalytically active substrate having a titanium dioxide coating on at least one surface thereof wherein the coating is crystalline and has an Ra value of less than 2 nm.
- 40. A photocatalytically active glass substrate having a titanium dioxide coating on at least one surface thereof wherein the coated surface exhibits a photocatalytic activity of at least 80% (expressed as the percentage reduction of the integrated absorption peaks corresponding to a thin film of stearic acid produced by UVA irradiation at an intensity of 0.76 W/m2 for a period of 30 minutes) and a visible light reflection of 20% or less.
Specification