Patent ID: 8337728

Claim:
A method for producing an optical filter that comprises a clay mineral complex (A) and a binder resin (E), the method comprising: forming the clay mineral complex (A) by intercalating a layered clay mineral (B) with a dye cation (C) and an organic cation (D), the ratio of the dye cation (C) and the organic cation (D) to one part of the layered clay mineral (B) being 0.01 to 0.9 parts and 0.1 to 0.99 parts, respectively; and following the forming step, adding the formed clay mineral complex (A) to the binder resin (E) at a ratio of 0.0001 to 50 parts by mass of the clay mineral complex (A) with respect to 100 parts by mass of solid components in the binder resin (E); and wherein the layered clay mineral (B) is lipophilic smectite, the binder resin (E) is an acrylic pressure sensitive adhesive, and the dye cation (C) is selected from the group consisting of cation of a cyanine compound, and cation of a diimmonium compound.