Heat-ray shielding composition and method for producing the same
AssigneesMitsubishi Materials Corporation, Mitsubishi Materials Electronic Chemicals Co., Ltd.
InventorsShinya Shiraishi, Megumi Narumi
Life of this patent
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Abstract
Disclosed are a heat-ray shielding composition including an indium tin oxide powder which has a BET specific surface area of 40 m2/g or more and a navy blue or cobalt blue (L=30 or less, a<0, b<0 in the Lab colorimetric system) tone, and preferably a heat-ray shielding composition, wherein the indium tin oxide powder contained in the composition is an indium tin oxide powder which is surface-modified by firing indium tin hydroxide having bright yellow to persimmon (reddish brown or orange-red) tone, or an indium tin oxide powder which is surface-modified by firing indium tin oxide having bright yellow to persimmon (reddish brown or orange-red) tone; and a method for producing the same.
Claims9
A heat-ray shielding composition comprising an indium tin oxide powder which has a BET specific surface area of 40 m2/g or more and a navy blue or cobalt blue (L=30 or less, a<0, b<0 in the Lab colorimetric system) tone, wherein a peak of the (222) plane in an X-ray diffraction chart has a relative intensity of about 2,800 to 5,000 cps, and has half value width of a peak of about 0.3 to 0.5° in the indium tin oxide powder.
A method for producing a heat-ray shielding composition, which comprises the steps of:
- mixing an indium compound and a divalent tin compound,
- co-precipitating an indium tin hydroxide in a presence of alkali and in a solution having a pH of 4.0 to 9.3 and a liquid temperature of 5° C. or higher;
- drying and firing the indium tin hydroxide to obtain a surface-modified indium tin oxide powder;
- and
- dispersing the surface-modified indium tin oxide powder in a solvent, and then mixing the dispersion solution with a resin,
- wherein, a dry powder of the indium tin hydroxide exhibits a bright yellow to persimmon (reddish brown or orange-red) color,
- the pH is adjusted within the range of 4.0 to 9.3 by using a mixed aqueous solution of the indium compound and the divalent tin compound and simultaneously adding dropwise the mixed aqueous solution and an aqueous alkali solution in an aqueous, and
- a peak of the (222) plane in an X-ray diffraction chart has a relative intensity of about 2,800 to 5,000 cps, and has half value width of a peak of about 0.3 to 0.5° in the surface-modified indium tin oxide powder.
Dependencies are inferred from the claim text.