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US 12,742,077 B2Granted
Surface-treated infrared-absorbing fine particles and method for producing the same, infrared-absorbing fine-particle dispersion liquid, and infrared-absorbing fine-particle dispersion body
AssigneeSumitomo Metal Mining Co., Ltd.
InventorsHirofumi Tsunematsu, Takeshi Chonan
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Abstract
Surface-treated infrared-absorbing fine particles, including: infrared-absorbing fine particles; and a coating film containing a metal oxide hydrate provided so as to coat surfaces of the infrared-absorbing fine particles, wherein a carbon concentration is 5.0% by mass or less as measured by a combustion-infrared absorption method.
Claims8
Surface-treated infrared-absorbing fine particles, comprising:
- infrared-absorbing fine particles;
- and
- a coating film containing a metal oxide hydrate provided so as to coat surfaces of the infrared-absorbing fine particles,
- wherein a carbon concentration of the coating film is 5.0% by mass or less as measured by a combustion-infrared absorption method, and a content of water derived from the metal oxide hydrate is 1.0% by mass or more and 8.0% by mass or less of the coating film and
- wherein the infrared-absorbing fine particles are at least one of tungsten oxide fine particles represented by a general formula WyOz, where W is tungsten, O is oxygen, and satisfying 2.2≤z/y ≤ 2.999, or composite tungsten oxide fine particles represented by a general formula MxWyOz, where M is one or more elements selected from H, He, 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, TI, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, I, and Yb, W is tungsten, O is oxygen, and satisfying 0.001≤x/y≤1 and 2.0≤z/y≤3.0.
2 more elements
A method for producing surface-treated infrared-absorbing fine particles, the method including:
- mixing infrared-absorbing fine particles and water to obtain a coating film-forming dispersion liquid;
- adding a surface treatment agent containing a metal chelate compound to the coating film-forming dispersion liquid;
- and
- applying heat treatment to the coating film-forming dispersion liquid to which the surface treatment agent has been added,
- to obtain surface-treated infrared-absorbing fine particles in which a coating film containing a metal oxide hydrate derived from the metal chelate compound, is formed on surfaces of the infrared-absorbing fine particles, and wherein a carbon concentration of the coating film is 5.0% by mass or less as measured by a combustion-infrared absorption method, and a content of water derived from the metal oxide hydrate is 1.0% by mass or more and 8.0% by mass or less of the coating film
- wherein the infrared-absorbing fine particles are at least one of tungsten oxide fine particles represented by a general formula WyOz, where W is tungsten, O is oxygen, and satisfying 2.2≤z/y≤2.999, or composite tungsten oxide fine particles represented by a general formula MxWyOz, where M is one or more elements selected from H, He, 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, TI, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, I, and Yb, W is tungsten, O is oxygen, and satisfying 0.001≤x/y≤1 and 2.0≤z/y≤3.0.
3 more elements
Dependencies are inferred from the claim text.