Photocatalyst sheet and method of producing same

A photocatalyst sheet characterized in that it comprises:

• a substrate;
• a first fluorocarbon resin layer coated on said substrate;
• a second fluorocarbon resin layer coated on said first fluorocarbon resin layer;
• and
• a third fluorocarbon resin layer containing photocatalysts consisting at least of titanium oxide (TiO2, TiO3) coated on said second fluorocarbon resin layer;
• of which said third fluorocarbon resin layer has lower melting point than said first fluorocarbon resin layer;
• said photocatalysts have the part exposed on said third fluorocarbon resin layer;
• the ratio of said photocatalysts in said third fluorocarbon resin layer is 10-60 weight %;
• and
• said photocatalyst sheet can be thermally welded to said third fluorocarbon resin layer, and when said photocatalyst sheets are thermally welded to each other, and if said welded part is peeled off at the rate of 20 mm/min, then whole of said fluorocarbon resin layer is completely peeled off from said substrate.

A photocatalyst sheet characterized in that it comprises:

• a substrate;
• a first fluorocarbon resin layer coated on said substrate;
• a second fluorocarbon resin layer coated on said first fluorocarbon resin layer;
• and
• a third fluorocarbon resin layer containing photocatalysts consisting at least of titanium oxide (TiO2, TiO3) coated on said second fluorocarbon resin layer;
• of which said third fluorocarbon resin layer has lower melting point than said first fluorocarbon resin layer;
• said photocatalysts have the part exposed on said third fluorocarbon resin layer;
• the ratio of said photocatalysts in said third fluorocarbon resin layer is 10-60 weight %;
• the surface of the fluorocarbon resin layer containing said photocatalysts of said photocatalyst sheet is water repellent upon ultraviolet light irradiation, and
• said photocatalyst sheet can be thermally welded to said third fluorocarbon resin layer, and when said photocatalyst sheets are thermally welded to each other, and if said welded part is peeled off at the rate of 20 mm/min, then whole of said fluorocarbon resin layer is completely peeled off from said substrate.

A manufacturing method of a photocatalyst sheet, which comprises:

• a substrate made of glass fiber;
• a first fluorocarbon resin layer made of PTFE coated on said substrate;
• a second fluorocarbon resin layer made of either one of PTFE, FEP, or PFA coated on said first fluorocarbon resin layer;
• and
• a third fluorocarbon resin layer made of FEP containing photocatalysts consisting at least of titanium oxide (TiO2, TiO3) coated on said second fluorocarbon resin layer;
• of which said photocatalysts have the part exposed on said third fluorocarbon resin layer, the ratio of said photocatalysts in said third fluorocarbon resin layer is 10-60 weight %, and the surface of said fluorocarbon resin layer containing said photocatalysts of said photocatalyst sheet is water repellent upon ultraviolet light irradiation, and when said photocatalyst sheets are thermally welded to each other, and if said welded part is peeled off at the rate of 20 mm/min, then whole of said fluorocarbon resin layer is completely peeled off from said substrate, and
• said method being characterized to comprise
• a process of coating the first fluorocarbon resin layer on the substrate;
• a process of coating the second fluorocarbon resin layer on said first fluorocarbon resin layer;
• and
• a process of coating the third fluorocarbon resin layer containing photocatalysts on said second fluorocarbon resin layer.

A manufacturing method of a photocatalyst sheet, which comprises:

• a substrate made of glass fiber;
• a first fluorocarbon resin layer made of PTFE coated on said substrate;
• a second fluorocarbon resin layer made of either one of PTFE, FEP, or PFA containing photocatalysts coated on said first fluorocarbon resin layer;
• and
• a third fluorocarbon resin layer made of FEP containing photocatalysts consisting at least of titanium oxide (TiO2, TiO3) coated on said second fluorocarbon resin layer;
• of which said photocatalysts have the part exposed on said third fluorocarbon resin layer, the ratio of said photocatalysts in said third fluorocarbon resin layer is 10-60 weight %, and the surface of said fluorocarbon resin layer containing said photocatalysts of said photocatalyst sheet is water repellent upon ultraviolet light irradiation, and when said photocatalyst sheets are thermally welded to each other, and if said welded part is peeled off at the rate of 20 mm/min, then whole of said fluorocarbon resin layer is completely peeled off from said substrate, and
• said method being characterized to comprise
• a process of coating the first fluorocarbon resin layer on the substrate;
• a process of coating the second fluorocarbon resin layer containing photocatalysts on said first fluorocarbon resin layer;
• and
• a process of coating the third fluorocarbon resin layer containing photocatalysts on said second fluorocarbon resin layer.