Patent ID: 8702858

Claim:
A method for producing a film, comprising: applying an aqueous dispersion liquid or a coating material comprising the aqueous dispersion liquid and at least one binder component selected from an inorganic binder and an organic binder on a substrate to form an applied film of the aqueous dispersion liquid or the coating material; and drying the applied film to produce the film, wherein the aqueous dispersion liquid comprises particles selected from tungsten oxide particles and tungsten oxide composite particles and a dispersion medium including water, wherein a mean primary particle diameter (D50) of the particles is in a range of 1 nm to 400 nm, a concentration of the particles in the aqueous dispersion liquid is in a range of 0.1 mass % to 40 mass %, and pH of the aqueous dispersion liquid is in a range of 1.5 to 6.5, and wherein the tungsten oxide composite contains at least one metal element selected from transition metal elements and aluminum, or a compound including at least one metal element selected from transition metal elements and aluminum, in a range of 0.001 mass % to 50 mass % as an amount of the metal element, balanced by tungsten oxide.