# US 10,870,105 B2 · Metatitanic acid particles, method for producing metatitanic acid particles, and composition for forming photocatalyst

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- Number: US 10,870,105 B2
- Document ID: US10870105B2
- Status: Granted
- Kind: B2
- Application number: 15/666,861
- Filed: 2017-08-02
- Published: 2018-10-04
- Granted: 2020-12-22
- Earliest claimed: 2017-03-29
- Assignees: Fuji Xerox Co., Ltd.
- Applicants: Fuji Xerox Co., Ltd.
- Inventors: Takeshi Iwanaga; Hideaki Yoshikawa; Hiroyoshi Okuno; Yasunobu Kashima; Sakae Takeuchi
- Web page: https://patentgrep.com/patent/US10870105B2

## CPC

- B01J 31/38: of titanium, zirconium or hafnium
- B01J 31/12: containing organo-metallic compounds or metal hydrides
- B01J 31/143: {of aluminium}
- B01J 35/39: Photocatalytic properties
- B01J 37/08: Heat treatment {(B01J37/0009, B01J37/0018 take precedence)}
- C07F 7/28: Titanium compounds
- B01J 21/063: {Titanium; Oxides or hydroxides thereof}
- B01J 31/0274: {containing silicon (ligands in coordination complexes B01J31/1608)}
- B01J 2531/46: Titanium
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C07F: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM (metal-containing porphyrins C07D487/22)

## Abstract

Metatitanic acid particles have absorption at wavelengths of 450 nm and 750 nm in a visible absorption spectrum, have a surface to which a metal compound having a metal atom and a carbon atom is bonded through an oxygen atom, and satisfy the following inequality: 0.03≤A≤0.3, wherein A represents a value of {(peak intensity of C—O bond+peak intensity of C═O bond)/(peak intensity of C—C bond+peak intensity of C═C bond} in a C 1s XPS spectrum.

## Claims

### Claim 1

Treated metatitanic acid particles, wherein each treated metatitanic acid particle comprises:
a particle containing metatitanic acid (TiO(OH)2); and
a metal compound bonded to a surface of the particle via an oxygen atom, the metal compound includes a metal atom and a hydrocarbon group, wherein the metal atom is silicon, aluminum, or titanium,
wherein the treated metatitanic acid particles:
(i) have absorption at wavelengths of 450 nm and 750 nm in a visible absorption spectrum,
(ii) satisfy the following inequality:
0.03≤A≤0.3
wherein A represents a value of {(peak intensity of C—O bond+peak intensity of C═O bond)/(peak intensity of C—C bond+peak intensity of C═C bond} in a C is orbital X-ray Photoelectron Spectroscopy spectrum, and
(iii) have undergone heat treatment at a temperature in a range of 180° C. or higher and 500° C. or lower.

### Claim 2 (depends on 1)

The treated metatitanic acid particles according to claim 1, wherein the metal compound has a carbon atom in the hydrocarbon group being directly bonded to the metal atom.

### Claim 3 (depends on 1)

The treated metatitanic acid particles according to claim 1, wherein the metal atom is a silicon atom.

### Claim 4 (depends on 1)

The treated metatitanic acid particles according to claim 1, wherein the treated metatitanic acid particles have a volume-average particle size in a range of 10 nm to 1 μm.

### Claim 5 (depends on 1)

The treated metatitanic acid particles according to claim 1, wherein the value of A is in a range of 0.04 to 0.25.

### Claim 6 (depends on 1)

The treated metatitanic acid particles according to claim 1, wherein the value of A is in a range of 0.05 to 0.20.

### Claim 7 (depends on 1)

The treated metatitanic acid particles according to claim 1, wherein the hydrocarbon group is a saturated or unsaturated aliphatic hydrocarbon group of 1 to 20 carbon atoms or an aromatic hydrocarbon group.

### Claim 8 (depends on 1)

The treated metatitanic acid particles according to claim 1, wherein the hydrocarbon group is a saturated aliphatic hydrocarbon group.

### Claim 9 (depends on 1)

A method for producing the treated metatitanic acid particles according to claim 1, the method comprising:
surface-treating untreated metatitanic acid particles with the metal compound having the metal atom and the hydrocarbon group; and
heat-treating the metatitanic acid particles during or after the surface-treating of the untreated metatitanic acid particles, wherein the metatitanic acid particles are heat treated at a temperature in a range of 180° C. or higher and 500° C. or lower to form the treated metatitanic acid particles.

### Claim 10 (depends on 9)

The method according to claim 9, wherein the metal compound has the hydrocarbon group directly bonded to the metal atom.

### Claim 11 (depends on 9)

The method according to claim 9, wherein the metal atom is a silicon atom.

### Claim 12 (depends on 9)

The method according to claim 9, wherein the hydrocarbon group is a saturated or unsaturated aliphatic hydrocarbon group of 1 to 20 carbon atoms or an aromatic hydrocarbon group.

### Claim 13 (depends on 9)

The method according to claim 9, wherein the hydrocarbon group is a saturated aliphatic hydrocarbon group of 1 to 20 carbon atoms.

### Claim 14 (depends on 9)

The method according to claim 9, wherein the hydrocarbon group is a saturated aliphatic hydrocarbon group of 4 to 10 carbon atoms.

### Claim 15 (depends on 1)

A composition for forming a photocatalyst, the composition comprising:
the treated metatitanic acid particles according to claim 1; and
at least one compound selected from the group consisting of a dispersion medium and a binder.

### Claim 16 (depends on 1)

The treated metatitanic acid particles according to claim 1, wherein the treated metatitanic acid particles have undergone heat treatment at a temperature in a range of 180° C. or higher and 400° C. or lower.

### Claim 17 (depends on 1)

The treated metatitanic acid particles according to claim 1, wherein the metal compound is at least one selected from the group consisting of an alkyl aluminate, an aluminum chelate, an aluminate coupling agent, a titanate coupling agent, a titanium chelate, and a silane compound having a hydrocarbon group.