Photocatalytically-activated self-cleaning article and method of making same
First Claim
1. A method for producing a layer of titanium dioxide in at least the crystalline phase, wherein said layer of titanium dioxide is a photocatalytically-activatable self-cleaning coating over glass float ribbon, and further wherein said coating is capable of having a photocatalytically-activated self-cleaning reaction rate of at least about 2×
- 10−
3 cm−
1min−
1 upon exposure to ultraviolet radiation, said method comprising the steps of;
positioning a chemical vapor deposition coating apparatus over a tin bath containing a glass ribbon having a temperature of at least about 400°
C. (752°
F.);
directing a titanium dioxide precursor through said chemical vapor deposition apparatus over a surface of the glass ribbon heated to said temperature; and
thereafter annealing the glass ribbon, whereby said layer of titanium dioxide is produced.
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Accused Products
Abstract
A method and article are disclosed wherein a substrate is provided with a photocatalytically-activated self-cleaning surface by forming a photocatalytically-activated self-cleaning coating on the substrate by spray pyrolysis chemical vapor deposition or magnetron sputter vacuum deposition. The coating has a thickness of at least about 500 Angstroms to limit sodium-ion poisoning to a portion of the coating facing the substrate. Alternatively, a sodium ion diffusion barrier layer is deposited over the substrate prior to the deposition of the photocatalytically-activated self-cleaning coating to prevent sodium ion poisoning of the photocatalytically-activated self-cleaning coating. The substrate includes glass substrates, including glass sheet and continuous float glass ribbon.
65 Citations
39 Claims
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1. A method for producing a layer of titanium dioxide in at least the crystalline phase, wherein said layer of titanium dioxide is a photocatalytically-activatable self-cleaning coating over glass float ribbon, and further wherein said coating is capable of having a photocatalytically-activated self-cleaning reaction rate of at least about 2×
- 10−
3 cm−
1min−
1 upon exposure to ultraviolet radiation, said method comprising the steps of;positioning a chemical vapor deposition coating apparatus over a tin bath containing a glass ribbon having a temperature of at least about 400°
C. (752°
F.);
directing a titanium dioxide precursor through said chemical vapor deposition apparatus over a surface of the glass ribbon heated to said temperature; and
thereafter annealing the glass ribbon, whereby said layer of titanium dioxide is produced. - View Dependent Claims (2, 3, 4, 5)
- 10−
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6. A method for producing a glass sheet comprising a layer of titanium dioxide in at least the crystalline phase, wherein said layer of titanium dioxide is a photocatalytically-activatable self-cleaning coating, and further wherein said coating is capable of having a photocatalytically-activated self-cleaning reaction rate of at least about 2×
- 10−
3 cm−
1 min−
1 upon exposure to ultraviolet radiation, said method comprising the steps of;positioning a chemical vapor deposition coating apparatus over a tin bath containing a glass ribbon having a temperature of at least about 400°
C. (752°
F.);
directing a titanium dioxide precursor in a carrier gas stream through said chemical vapor deposition apparatus over a surface of the glass ribbon heated to said temperature; and
thereafter annealing the glass ribbon; and
producing a glass sheet from said annealed glass ribbon, whereby said glass sheet contains said layer of titanium dioxide. - View Dependent Claims (7, 8, 9, 10, 11)
- 10−
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12. In a method for forming a glass float ribbon wherein the method includes the steps of melting glass batch materials in a furnace;
- delivering the molten glass onto a bath of molten tin;
pulling the molten glass across the tin bath whereupon the glass is sized and controllably cooled to form a dimensionally stable glass float ribbon;
removing the float ribbon from the tin bath;
moving the float ribbon by conveying roller through a lehr to anneal the float ribbon;
moving the float ribbon to a cutting station on conveying rollers where the ribbon is cut into glass sheets, the improvement comprising;depositing over a surface of said float ribbon as the float ribbon is formed in said tin bath by chemical vapor deposition at least a crystalline phase of a photocatalytically-activatable self-cleaning coating, whereby said glass sheets comprise said photocatalytically-activatable self cleaning coating. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
- delivering the molten glass onto a bath of molten tin;
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24. A method comprising the steps of:
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providing by a float manufacturing process a glass article having at least one surface;
depositing in a tin bath during said float manufacturing process a photocatalytically-activatable self-cleaning coating over the surface of the article by chemical vapor deposition so that the coating has titanium dioxide in at least the crystalline phase and has a thickness ranging from at least 100 Å
to less than 1 micron.- View Dependent Claims (25, 26, 27)
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28. A process for the production of a titanium dioxide coating having a thickness ranging from about 100 to about 1000 Angstroms on a float glass ribbon, comprising:
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manufacturing a continuous float glass ribbon having a first major surface and an opposite major surface defined as a second major surface;
positioning a chemical vapor deposition coating apparatus over the surface of the float ribbon at a point in a tin bath where the float ribbon has a temperature of at least about 400°
C.;
directing a titanium metal oxide precursor through said chemical vapor deposition apparatus over a surface of the float ribbon in said tin bath, and annealing the float ribbon whereby a titanium dioxide coating comprising at least anatase and amorphous phases of titanium dioxide is produced, and wherein the titanium dioxide coating is a photocatalytically-activatable self-cleaning coating. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35)
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36. A method comprising the steps of:
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providing by a float glass manufacturing process a glass article having at least one surface;
depositing a sodium ion diffusion barrier coating over the surface of the article by chemical vapor deposition in a tin bath during the glass manufacturing process; and
depositing at a temperature in the range of from about 538°
to below about 800°
C. (1000°
to 1472°
F.) a photocatalytically-activatable self-cleaning coating over the barrier coating so that the photocatalytically-activatable self-cleaning coating comprises titanium dioxide in at least the crystalline phase and has a thickness ranging from at least about 100 Å
to less than 1 micron.- View Dependent Claims (37, 38, 39)
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Specification