# US 6,294,247 B1 · Multi-functional material with photocatalytic functions and method of manufacturing same

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- Number: US 6,294,247 B1
- Document ID: US6294247B1
- Status: Granted
- Kind: B1
- Application number: 09/167,327
- Filed: 1998-10-07
- Granted: 2001-09-25
- Earliest claimed: 1993-10-12
- Assignees: Toto Ltd.
- Inventors: Toshiya Watanabe; Eiichi Kojima; Keiichiro Norimoto; Tamon Kimura; Mitsuyoshi Machida; Makoto Hayakawa; Atsushi Kitamura; Makoto Chikuni; Yoshimitsu Saeki; Tatsuhiko Kuga; Yasushi Nakashima
- Web page: https://patentgrep.com/patent/US6294247B1

## CPC

- B01J 21/063: {Titanium; Oxides or hydroxides thereof}
- B01J 35/38: Abrasion or attrition resistance
- B01J 35/39: Photocatalytic properties
- B01J 35/395: {Thickness of the active catalytic layer}
- B01J 35/77: Compounds characterised by their crystallite size
- B01J 37/0215: {Coating}
- C03C 17/007: {containing a dispersed phase, e.g. particles, fibres or flakes, in a continuous phase}
- C03C 17/3411: {with at least two coatings of inorganic materials (C03C17/36, C03C17/42 take precedence)}
- C04B 41/009: {characterised by the material treated}
- C04B 41/4562: {Photographic methods, e.g. making use of photo-sensitive materials}
- C04B 41/52: Multiple coating or impregnating {multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation}
- C04B 41/81: Coating or impregnation
- C04B 41/89: for obtaining at least two superposed coatings having different compositions
- B01J 35/36: Mechanical strength
- B01J 2235/00: Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties
- B01J 2235/15: X-ray diffraction
- B01J 2235/30: Scanning electron microscopy; Transmission electron microscopy
- C03C 2217/42: consisting of particles only
- C03C 2217/425: consisting of a porous layer
- C03C 2217/475: Inorganic materials
- C03C 2217/477: Titanium oxide
- C03C 2217/71: Photocatalytic coatings
- Y10S 430/148: Light sensitive titanium compound containing
- Y10T 428/24909: Free metal or mineral containing
- Y10T 428/24997: Of metal-containing material
- Y10T 428/249974: Metal- or silicon-containing element
- Y10T 428/249982: With component specified as adhesive or bonding agent
- Y10T 428/249985: Composition of adhesive or bonding component specified
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Multi-functional materials which have a photocatalytic layer with a photocatalytic function disposed on the surface of a base through a binder layer 6 interposed therebetween. Photocatalytic particles of the photocatalytic layer are joined together by a surface energy or solid-state sintering. The photocatalytic layer may have a structure in which fine particles fill interstices defined between photocatalytic particles or a structure in which no fine particles fill interstices defined between photocatalytic particles. A metal such as Ag, Pt, or the like may be fixed or not fixed to surfaces of the photocatalytic particles.

## Claims

### Claim 1

A multi-functional material with a photocatalytic function, comprising:
a base;
a photocatalytic layer having a photocatalytic function disposed on a surface of said base, photocatalytic layer including at least a surface layer exposed outwardly, said surface layer being composed of fine photocatalytic particles joined together with interstices defined therebetween at a predetermined porosity; and
particles filled in said interstices which are smaller than the interstices, said particles having a diameter of less than 0.1 μm;
said particles filled in the interstices defined between said photocatalytic particles having an average diameter which is ⅘ or less of the average diameter of said photocatalytic particles, and
said particles filled in the interstices defined between said photocatalytic particles are made of a material having a vapor pressure higher than the vapor pressure of a material of said photocatalytic particles, and are condensed on necks between the photocatalytic particles.

### Claim 2 (depends on 1)

A multi-functional material according to claim 1, wherein said particles filled in the interstices defined between said photocatalytic particles are made of tin oxide.

### Claim 3

A multi-functional material with a photocatalytic function, comprising:
a base;
a photocatalytic layer having a photocatalytic function disposed on a surface of said base, said photocatalytic layer including at least a surface layer exposed outwardly, said surface layer being composed of fine photocatalytic particles joined together with interstices defined therebetween at a predetermined porosity; and
particles filled in said interstices which are smaller than the interstices, said particles having a diameter of less than 0.1 μm;
wherein said smaller particles comprise at least one of Cu in an amount of 0.7/g/cm2-10 g/cm2 and Ag in an amount of 0.05 g/cm2-1 g/cm2.