# US 8,541,106 B2 · Glass article provided with photocatalyst film > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,541,106 B2 - Document ID: US8541106B2 - Status: Granted - Kind: B2 - Application number: 13/390,649 - Filed: 2010-08-17 - Published: 2012-06-14 - Granted: 2013-09-24 - Earliest claimed: 2009-08-17 - Assignees: Nippon Sheet Glass Co., Ltd. - Applicants: Takeshi Yabuta; Fumiyoshi Kondo; Masaatsu Kido; Masahiro Hori; Mitsuhiro Kawazu; Kazutaka Kamitani - Inventors: Takeshi Yabuta; Fumiyoshi Kondo; Masaatsu Kido; Masahiro Hori; Mitsuhiro Kawazu; Kazutaka Kamitani - Web page: https://patentgrep.com/patent/US8541106B2 ## CPC - G02B 1/11: Anti-reflection coatings - 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 37/0215: {Coating} - C03C 17/006: {with materials of composite character} - C03C 17/23: Oxides (C03C17/02 takes precedence) - C09D 1/02: alkali metal silicates - C09D 5/1618: {inorganic} - 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 2235/30: Scanning electron microscopy; Transmission electron microscopy - C03C 2217/42: consisting of particles only - C03C 2217/71: Photocatalytic coatings - Y10T 428/259: Silicic material - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - 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 - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Provided is a glass article that improves the film strength of a photocatalyst film while maintaining the photocatalytic function and the reflection suppressing function of the photocatalyst film. The photocatalyst film on the glass sheet is formed to contain, in mass %, 50 to 82% of silicon oxide particles, 8 to 40% of titanium oxide particles, and 7 to 20% of a binder component composed of silicon oxide. The average particle diameter of the silicon oxide particles is set to at least 5 times the average particle diameter of the titanium oxide particles. The photocatalyst film is formed to have a structure such that some of the silicon oxide particles in the film serve as protruding silicon oxide particles that are not in contact with the glass sheet and that have their top portions protruding from the surrounding titanium oxide particles and being exposed on the surface of the film, while some of the titanium oxide particles are interposed between the glass sheet and the protruding silicon oxide particles. ## Claims ### Claim 1 A glass article comprising: a glass sheet; and a photocatalyst film formed on a surface of the glass sheet, wherein the glass article has a reduced reflectance for light incident on the glass sheet due to the photocatalyst film, the photocatalyst film contains silicon oxide particles, titanium oxide particles, and a binder composed of silicon oxide component, the content of the silicon oxide particles falls in the range of 50 to 82 mass %, the content of the titanium oxide particles falls in the range of 8 to 40 mass %, and the content of the binder component falls in the range of 7 to 20 mass %, in the total amount of the silicon oxide particles, the titanium oxide particles, and the binder component, the silicon oxide particles have an average particle diameter that is at least 5 times an average particle diameter of the titanium oxide particles, some of the silicon oxide particles contained in the photocatalyst film serve as protruding silicon oxide particles, and some of the titanium oxide particles contained in the photocatalyst film are interposed between the glass sheet and the protruding silicon oxide particles, where the protruding silicon oxide particles denote silicon oxide particles: 1) being not in contact with the glass sheet; 2) in the case where titanium oxide particles in contact with the silicon oxide particles are present, having their top portions at a position farther from the glass sheet than top portions of the titanium oxide particles that are in contact with the silicon oxide particles, while in the case where titanium oxide particles in contact with the silicon oxide particles are absent, having their top portions at a position farther from the glass sheet than top portions of titanium oxide particles closest to the silicon oxide particles; and 3) having their top portions exposed on a surface of the photocatalyst film. ### Claim 2 (depends on 1) The glass article according to claim 1, wherein the content of the silicon oxide particles falls in the range of 50 to 57 mass %, the content of the titanium oxide particles falls in the range of 30 to 40 mass %, and the content of the binder component falls in the range of 8 to 14 mass %, in the total amount of the silicon oxide particles, the titanium oxide particles, and the binder component. ### Claim 3 (depends on 1) The glass article according to claim 1, wherein the content of the silicon oxide particles falls in the range of 60 to 82 mass %, the content of the titanium oxide particles falls in the range of 8 to 25 mass %, and the content of the binder component falls in the range of 10 to 20 mass %, in the total amount of the silicon oxide particles, the titanium oxide particles, and the binder component. ### Claim 4 (depends on 3) The glass article according to claim 3, wherein the content of the silicon oxide particles falls in the range of 65 to 75 mass %, the content of the titanium oxide particles falls in the range of 13 to 23 mass %, and the content of the binder component falls in the range of 10 to 16 mass %, in the total amount of the silicon oxide particles, the titanium oxide particles, and the binder component. ### Claim 5 (depends on 1) The glass article according to claim 1, wherein four or more of the protruding silicon oxide particles are present in an area of a 500 nm-square defined on a surface of the glass sheet. ### Claim 6 (depends on 1) The glass article according to claim 1, wherein the protruding silicon oxide particles are fixed to the glass sheet via silicon oxide particles that do not fall under the protruding silicon oxide particles. ### Claim 7 (depends on 1) The glass article according to claim 1, wherein a part of the titanium oxide particles contained in the photocatalyst film are exposed on a surface of the photocatalyst film in an aggregated state above the silicon oxide particles that do not fall under the protruding silicon oxide particles.