Patent ID: 8083847

Claim:
A fine particle dispersion of infrared-shielding material, the fine particle dispersion having visible light transparency, and is formed by dispersing fine particles of an infrared-shielding material in a medium, wherein the fine particles of the infrared-shielding material are tungsten oxide composite fine particles expressed by a general formula M x W y O z , where M is at least one element selected from the group consisting of H, an alkali metal, an alkaline earth metal, a rare earth element, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, I and a mixture thereof; W is tungsten; O is oxygen; and the general formula M x W y O z satisfies 0.001≦x/y≦1 and 2.2z/y≦3.0; a particle diameter of the infrared-shielding material is not less than 1 nm and not more than 800 nm; and the medium is resin or glass.