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

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 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.

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 substrate;
• 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.