Photocatalyst composite and process for producing the same

• US 5,547,823 A
• Filed: 11/09/1995
• Issued: 08/20/1996
• Est. Priority Date: 06/28/1993
• Status: Expired due to Term

• Current Assignee: Akira Fujishima, Ishihara Sangyo Kaisha Limited, Kazuhito Hashimoto
• Original Assignee: Akira Fujishima, Ishihara Sangyo Kaisha Limited, Kazuhito Hashimoto
• Inventors: Fujishima, Akira, Hashimoto, Kazuhito, Watanabe, Mitsuru, Murakami, Hajime, Murasawa, Sadao, Fukui, Yasuro
• Primary Examiner(s): Le, Hoa Van
• Application Number:
  US08/555,548
• Time in Patent Office: 285 Days
• Field of Search: 204/155, 210/763, 252/600, 427/126.5, 427/126.6, 427/212, 427/216, 427/217, 430/531, 430/947, 430/950
• US Class Current: 430/531
• CPC Class Codes: B01J 35/30 characterised by their physical properties
• CPC Class Codes: B01J 35/39 Photocatalytic properties
• CPC Class Codes: B01J 37/0219 the coating containing organic compounds
• CPC Class Codes: C03C 17/007 containing a dispersed phase, e.g. particles, fibres or flakes, in a continuous phase
• CPC Class Codes: C03C 17/256 Coating containing TiO2
• CPC Class Codes: C03C 17/3405 with at least two coatings of organic materials C03C17/36, C03C17/42 take precedence
• CPC Class Codes: C03C 2204/02 Antibacterial glass, glaze or enamel
• CPC Class Codes: C03C 2217/212 TiO2
• CPC Class Codes: C03C 2217/25 Metals
• CPC Class Codes: C03C 2217/29 Mixtures
• CPC Class Codes: C03C 2217/445 Organic continuous phases
• CPC Class Codes: C03C 2217/45 Inorganic continuous phases
• CPC Class Codes: C03C 2217/477 Titanium oxide
• CPC Class Codes: C03C 2217/479 Metals
• CPC Class Codes: C03C 2217/71 Photocatalytic coatings
• CPC Class Codes: C03C 2218/11 from solutions or suspensions
• CPC Class Codes: Y10S 430/148 Light sensitive titanium compound containing
• CPC Class Codes: Y10S 430/151 Matting or other surface reflectivity altering material

Abstract

A photocatalyst composite is provided which comprise a substrate having particles of a photocatalyst such as titanium oxide, adhered thereon via a less degradative adhesive such as a fluorinated polymer comprising a copolymer of a vinyl ester and/or vinyl ether and a fluoroolefin, or a silicon based polymer or cement. Furthermore, a process for producing the photocatalyst composite and a coating composition containing the photocatalyst composite are provided.

Claims

1. A photocatalyst composite comprising a substrate having photocatalyst particles of titanium oxide adhered thereon via an adhesive of fluorinated polymers, said photocatalyst particles containing a second component of at least one selected from the group consisting of metals and metal compounds of V, Fe, Co, Ni, Cu, Zn, Ru, Rh, Pd, Ag, Pt and Au, inside and/or on the surfaces thereof, and the content of said photocatalyst particles being in the range of 50-98% by volume based on the total amount of said photocatalyst particles and said fluorinated polymers.

2. The photocatalyst composite of claim 1 wherein the fluorinated polymer adhesive is selected from the group consisting of crystalline fluorinated resins, amorphous fluorinated resins and fluorinated elastomers.

3. The photocatalyst composite of claim 1 wherein said photocatalyst particles are of titanium oxide selected from the group consisting of hydrated titanium oxide, hydrous titanium oxide, metatitanates, orthotitanates and titanium hydroxide.

4. The photocatalyst composite of claim 1 wherein said photocatalyst particles are of titanium oxide regardless of crystal system.

5. The photocatalyst composite of claim 1 wherein said fluorinated polymers are selected from the group consisting of polyvinyl fluorides, polyvinylidene fluorides, polyethylene trifluorochlorides, polyethylene tetrafluorides, tetrafluoroethylene-hexafluoropropylene copolymers, ethylene-polyethylene tetrafluoride copolymers, ethylene-ethylene trifluorochloride copolymers, tetrafluoroethylene-perfluoroalkylvinyl ether copolymers, perfluorocyclo polymers, vinylether-fluoroolefin copolymers, and vinylester-fluoroolefin copolymers.

6. The photocatalyst composite of claim 1 wherein said fluorinated polymers comprise primarily a copolymer of a vinyl ether and/or a vinyl ester and a fluoroolefin.