Patent ID: 7410690

Claim:
An ultrafine mixed-crystal oxide has a BET specific surface area of about 10 to about 200 m 2 /g, and, wherein said oxide has a change in absorbance of about 5 (/hr) or less when measured in such a manner that said oxide is dispersed at a concentration of 0.067% in a solvent of a 98% glycerin in which Sunset Yellow is dissolved at a concentration of 0.02%, thereby preparing a dispersion, and said dispersion is irradiated with a BLB lamp (ultraviolet light) with an intensity of 1.65 mW/cm 2 to obtain said change in absorbance (ΔOD) at 490 nm, and wherein said oxide comprises primary particles in a mixed crystal state with a bond selected from the group consisting of a titanium-oxygen-silicon bond, a titanium-oxygen-aluminum bond, and an aluminum-oxygen-silicon bond.