Nippon Shokubai Co., Ltd.

Junya Kimura

Koichi Hirota

Hironobu Hashimoto

Tomoyuki Yao

An object of the present invention is to provide zirconium oxide nanoparticles having large particle diameters. The present invention is zirconium oxide nanoparticles wherein a ratio CD90/D50) of a cumulative 90% particle diameter D90 by volume to a cumulative 50% particle diameter D50 by volume in particle diameter measurement by a dynamic light scattering method is not larger than 3.0, and a half width for a (101) plane in XHD measurement in which CuKα rays are used as a light source is not larger than 1.20°. The zirconium oxide nanoparticles preferably have a diffusion coefficient in particle diameter measurement by a dynamic light scattering method of not larger than 7.0×10cm/sec.

Zirconium oxide nanoparticles, dispersion liquid and resin composition

The present invention provides a material that has a good compatibility with monomers and can be used as dispersing agent even after a period of not shorter than one week since the preparation of the dispersion. The dispersion of the present invention comprising metal oxide particles with an average primary particle diameter of not more than 50 nm; an organic acid; a dispersion medium; and an organophosphorus compound represented by formula (1) or an organosulfur compound represented by formula (2).

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Osaka, Japan

Junya Kimura