# US 2018/0022930 A1 · Low-reflection coated glass sheet, method for producing low-reflection coated substrate, and coating liquid for forming low-reflection coating of low-reflection coated substrate > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0022930 A1 - Document ID: US20180022930A1 - Status: Published application - Kind: A1 - Application number: 15/546,922 - Filed: 2016-01-28 - Published: 2018-01-25 - Earliest claimed: 2015-01-29 - Assignees: Nippon Sheet Glass Co., Ltd. - Applicants: Nippon Sheet Glass Company, Limited - Inventors: Mizuho KOYO; Mitsuhiro KAWAZU - Web page: https://patentgrep.com/patent/US20180022930A1 ## CPC - C09D 5/006: {Anti-reflective coatings} - C03C 17/007: {containing a dispersed phase, e.g. particles, fibres or flakes, in a continuous phase} - C03C 17/25: by deposition from the liquid phase - C03C 17/256: {Coating containing TiO2} - C08K 3/36: Silica - C09D 1/00: Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances - C09D 5/00: Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes - C09D 7/40: Additives - C09D 7/61: inorganic - C09D 7/67: {Particle size smaller than 100 nm} - C09D 7/68: {Particle size between 100-1000 nm} - C09D 7/70: {characterised by shape, e.g. fibres, flakes or microspheres} - C03C 2217/732: made of a single layer - C03C 2218/118: by roller-coating - C08K 2003/2241: {Titanium dioxide} - 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) - 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 - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) ## Abstract A low-reflection coated glass sheet of the present invention includes a glass sheet and a low-reflection coating. The low-reflection coating is formed on at least a portion of one principal surface of the glass sheet, and contains a binder containing silica as a main component, fine silica particles bound by the binder, and fine titania particles bound by the binder. For the low-reflection coated glass sheet, a transmittance gain is 1.7% or more. The low-reflection coating contains 25 mass % to 43 mass % of the silica which is the main component of the binder, 40 mass % to 64 mass % of the fine silica particles, and 10 mass % to 20 mass % of the fine titania particles, based on the total mass of the low-reflection coating. As such, the low-reflection coated glass sheet of the present invention has high abrasion resistance and is capable of exhibiting photocatalytic properties and hydrophilicity when irradiated with light. ## Claims ### Claim 1 A low-reflection coated glass sheet comprising: a glass sheet; and a low-reflection coating formed on at least a portion of one principal surface of the glass sheet, the low-reflection coating containing a binder containing silica as a main component, fine silica particles bound by the binder, and fine titania particles bound by the binder, wherein a transmittance gain is 1.7% or more, the transmittance gain being determined by subtracting an average light transmittance of the glass sheet unprovided with the low-reflection coating in the wavelength of 380 nm to 850 nm from an average light transmittance of the low-reflection coated glass sheet in the wavelength range of 380 nm to 850 nm, and the low-reflection coating contains 25 mass % to 43 mass % of the silica of the binder, 40 mass % to 64 mass % of the fine silica particles, and 10 mass % to 20 mass % of the fine titania particles, based on the total mass of the low-reflection coating. ### Claim 2 (depends on 1) The low-reflection coated glass sheet according to claim 1, wherein the transmittance gain is 2.0% or more, and the low-reflection coating contains 26 mass % to 33 mass % of the silica of the binder, 47 mass % to 64 mass % of the fine silica particles, and 10 mass % to 20 mass % of the fine titania particles, based on the total mass of the low-reflection coating. ### Claim 3 (depends on 1) The low-reflection coated glass sheet according to claim 1, wherein the low-reflection coating contains 28 mass % to 30 mass % of the silica of the binder and 48 mass % to 58 mass % of the fine silica particles, based on the total mass of the low-reflection coating. ### Claim 4 (depends on 1) The low-reflection coated glass sheet according to claim 1, wherein a reflectance loss is 1.0% or more, the reflectance loss being determined by subtracting an average light reflectance of the low-reflection coated glass sheet in the wavelength range of 360 nm to 740 nm from an average light reflectance of the glass sheet unprovided with the low-reflection coating in the wavelength range of 360 nm to 740 nm, the average light reflectance of the low-reflection coated glass sheet being determined after the low-reflection coated glass sheet is subjected to a reciprocating abrasion test performed by moving an abrasive, CS-10F, in contact with the low-reflection coating at a load of 4 N with 50 cycles of reciprocation. ### Claim 5 (depends on 1) The low-reflection coated glass sheet according to claim 1, wherein a contact angle of a water droplet on the low-reflection coating is 5° or less, the contact angle being determined after the low-refection coating is irradiated with ultraviolet light having a wavelength of 352 nm and an energy density of 1 mW/cm2 for 24 hours. ### Claim 6 A method for producing a low-reflection coated substrate, wherein the low-reflection coated substrate includes: a substrate; and a low-reflection coating formed on at least a portion of one principal surface of the substrate, the low-reflection coating containing a binder containing silica as a main component, fine silica particles bound by the binder, and fine titania particles bound by the binder, a transmittance gain is 1.7% or more, the transmittance gain being determined by subtracting an average light transmittance of the substrate unprovided with the low-reflection coating in the wavelength of 380 nm to 850 nm from an average light transmittance of the low-reflection coated substrate in the wavelength range of 380 nm to 850 nm, and the low-reflection coating contains 25 mass % to 43 mass % of the silica of the binder, 40 mass % to 64 mass % of the fine silica particles, and 10 mass % to 20 mass % of the fine titania particles, based on the total mass of the low-reflection coating, the method comprising: forming a coating film by applying a coating liquid to the substrate; and forming the low-reflection coating by drying and curing the coating film, wherein a surface of the substrate has a maximum temperature of 120° C. or higher and 350° C. or lower in the drying and curing of the coating film. ### Claim 7 (depends on 6) The method according to claim 6, wherein, in the drying and curing of the coating film, a duration during which the surface of the substrate has a temperature of 200° C. or higher is 5 minutes or less. ### Claim 8 (depends on 6) The method according to claim 6, wherein, in the drying and curing of the coating film, a duration during which the surface of the substrate has a temperature of 120° C. or higher is 3 minutes or less. ### Claim 9 (depends on 6) The method according to claim 6, wherein the coating liquid comprises fine silica particles, fine titania particles, a starting material of the binder, and a solvent, the starting material of the binder comprises a silicon alkoxide, and the solvent comprises an organic solvent as a main component, the organic solvent being miscible with water and having a boiling point of 150° C. or lower. ### Claim 10 A coating liquid for forming a low-reflection coating of a low-reflection coated substrate, wherein the low-reflection coating is formed on at least a portion of one principal surface of a substrate and contains a binder containing silica as a main component, fine silica particles bound by the binder, and fine titania particles bound by the binder, a transmittance gain is 1.7% or more, the transmittance gain being determined by subtracting an average light transmittance of the substrate unprovided with the low-reflection coating in the wavelength of 380 nm to 850 nm from an average light transmittance of the low-reflection coated substrate in the wavelength range of 380 nm to 850 nm, and the low-reflection coating contains 25 mass % to 43 mass % of the silica of the binder, 40 mass % to 64 mass % of the fine silica particles, and 10 mass % to 20 mass % of the fine titania particles, based on the total mass of the low-reflection coating, the coating liquid comprising fine silica particles, fine titania particles, a starting material of the binder, and a solvent, the starting material of the binder comprising a silicon alkoxide, the solvent comprising an organic solvent as a main component, the organic solvent being miscible with water and having a boiling point of 150° C. or lower. ### Claim 11 (depends on 10) The coating liquid according to claim 10, further comprising an acid as a catalyst for hydrolysis of the silicon alkoxide, the acid having an acid dissociation constant pKa of 2.5 or less.