# US 10,478,803 B2 · Glass article provided with photocatalyst film, process for producing glass article, and coating liquid

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- Number: US 10,478,803 B2
- Document ID: US10478803B2
- Status: Granted
- Kind: B2
- Application number: 15/289,642
- Filed: 2016-10-10
- Published: 2017-01-26
- Granted: 2019-11-19
- Earliest claimed: 2012-02-03
- Assignees: Nippon Sheet Glass Co., Ltd.
- Applicants: Nippon Sheet Glass Company, Limited
- Inventors: Takeshi Yabuta; Fumiyoshi Kondo; Mitsuhiro Kawazu
- Web page: https://patentgrep.com/patent/US10478803B2

## CPC

- B01J 21/08: Silica
- B01J 35/39: Photocatalytic properties
- B01J 35/395: {Thickness of the active catalytic layer}
- B01J 35/45: Nanoparticles
- B01J 37/0219: {the coating containing organic compounds}
- B01J 37/0236: {Drying, e.g. preparing a suspension, adding a soluble salt and drying}
- C03C 17/007: {containing a dispersed phase, e.g. particles, fibres or flakes, in a continuous phase}
- C03C 17/23: Oxides (C03C17/02 takes precedence)
- C03C 17/256: {Coating containing TiO2}
- G02B 1/18: Coatings for keeping optical surfaces clean, e.g. hydrophobic or photo-catalytic films (G02B1/16 takes precedence)
- G02B 27/0006: {with means to keep optical surfaces clean, e.g. by preventing or removing dirt, stains, contamination, condensation (G02B1/18 takes precedence; cleaning in general B08B)}
- B01J 21/063: {Titanium; Oxides or hydroxides thereof}
- B01J 2235/00: Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties
- B01J 2235/30: Scanning electron microscopy; Transmission electron microscopy
- C03C 2217/42: consisting of particles only
- C03C 2217/445: Organic continuous phases
- C03C 2217/45: Inorganic continuous phases
- C03C 2217/477: Titanium oxide
- C03C 2217/478: Silica
- C03C 2217/48: having a specific function
- C03C 2217/71: Photocatalytic coatings
- Y10T 428/256: Heavy metal or aluminum or compound thereof
- 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
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The present invention provides a glass article including a photocatalyst film 1 containing silicon oxide particles 6 and titanium oxide particles 5, and a glass sheet 2. Assuming that the photocatalyst film 1 has a film thickness T, 80% or more of the titanium oxide particles are localized in a region between a surface of the glass sheet 2 and a position spaced from the surface by 0.6 T toward a surface of the photocatalyst film 1 in a thickness direction of the photocatalyst film 1. The glass article has an increased transmittance provided by enhancing the reflection-reducing function of the photocatalyst film 1 while maintaining the film strength and photocatalytic function of the photocatalyst film 1.

## Claims

### Claim 1

A coating liquid for producing a photocatalyst film, comprising:
silicon oxide particles;
titanium oxide particles;
ethylene glycol; and
a binder source as a source of a binder material whose main component is silicon oxide,
wherein the ratio among the mass of the silicon oxide particles, the mass of the titanium oxide particles, and the mass of the binder material in terms of SiO2 is 72 to 79:13 to 18:8 to 12,
the silicon oxide particles have an average particle diameter of 50 nm to 150 nm, the titanium oxide particles have an average particle diameter of 5 nm to 20 nm, and the average particle diameter of the silicon oxide particles is five times or more of the average particle diameter of the titanium oxide particles,
the binder source is silicon alkoxide, and
a concentration of the ethylene glycol in the coating liquid is 5 to 15% in terms of mass.

### Claim 2 (depends on 1)

The coating liquid according to claim 1, wherein the concentration of the ethylene glycol in the coating liquid is 8 to 12% in terms of mass.

### Claim 3 (depends on 1)

A method for producing a glass article, the method comprising applying the coating liquid of claim 1 to a glass sheet to form a coating film on the glass sheet, drying the glass sheet to which the coating liquid is applied, and obtaining a glass article comprising the glass sheet and a photocatalyst Film formed on a surface of the glass sheet by sintering the coating film.

### Claim 4 (depends on 3)

The method for producing a glass article according to claim 3, wherein the coating liquid includes a surfactant.