# US 5,707,915 A · Photocatalyst sheet and method for producing thereof

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- Number: US 5,707,915 A
- Document ID: US5707915A
- Status: Granted
- Kind: A
- Application number: 08/732,122
- Filed: 1996-10-15
- Granted: 1998-01-13
- Earliest claimed: 1995-10-16
- Assignees: Japan as represented by Director General of Agency of Industrial Science and Technology
- Inventors: Hiroshi Taoda
- Web page: https://patentgrep.com/patent/US5707915A

## CPC

- B01D 53/8678: {Removing components of undefined structure}
- B01J 35/39: Photocatalytic properties
- B01J 35/70: characterised by their crystalline properties, e.g. semi-crystalline (catalysts comprising carbon B01J21/18; molecular sieves B01J29/00)
- B60H 3/06: Filtering
- B01D 2255/20707: Titanium
- B01D 2255/802: Photocatalytic
- B01D 2257/90: Odorous compounds not provided for in groups B01D2257/00 - B01D2257/708
- B60H 2003/0675: {Photocatalytic filters}
- Y02W 10/37: using solar energy
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B60H: ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT

## Abstract

A photocatalyst sheet capable of purifying the living environment by decomposing and removing malodorous substances and environment-polluting substances in the air, preventing development of bacterium, fungi, and protecting contamination, and a method for production thereof which comprises coating a solution of a titania sol on the surface of a sheet of organic substance such as plastic, and heating it under pressure to deposit the titanium powder on the surface of the sheet.

## Claims

### Claim 1

A method for production of a photocatalyst sheet comprising coating one side of a sheet of an organic substance with a titania sol containing a titanium oxide powder, and heating the said sheet and applying pressure of one atmosphere or more to the said titanium oxide powder to deposit the titanium oxide powder on the surface of the sheet.

### Claim 2 (depends on 1)

The method for production of the photocatalyst sheet according to claim 1, wherein the heating temperature is near the melting point of the sheet of the organic substance.

### Claim 3 (depends on 1)

The method of production of the photocatalyst sheet according to claim 1, wherein the titania sol is prepared by suspending an ultrafine titanium oxide powder possessing a crystal form of anatase in water or an organic solvent to form a suspension or a slurry of the same.

### Claim 4 (depends on 1)

The method of production of the photocatalyst sheet according to claim 1, wherein pressure is applied with a roll press.

### Claim 5 (depends on 1)

The method of production of the photocatalyst sheet according to claim 1, wherein pressure is applied with air.

### Claim 6 (depends on 1)

A photocatalyst sheet produced by the method according to claim 1, wherein the titanium oxide powder is deposited on one side of the sheet of the organic substance under applying pressure to the said titanium oxide powder.

### Claim 7 (depends on 4)

A photocatalyst sheet according to claim 4, wherein the crystal form of the titanium oxide is anatase.