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Title:
TITANIUM OXIDE PARTICLES AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2022/244620
Kind Code:
A1
Abstract:
The present invention provides: titanium oxide particles which exhibits excellent uniformity and excellent dispersibility, while containing less coarse particles; a method for producing the titanium oxide particles; and a slurry, a dispersion, a composition and a dielectric starting material, each of which contains the titanium oxide particles. With respect to the titanium oxide particles according to the present invention, the D90(LD)/D50(LD) of the titanium oxide particles as determined by a laser diffraction/scattering method is more than 1.0 but not more than 2.0; and the concentration (on a number basis) of coarse particles relative to D50 (SEM) of primary particles as determined by the observation with a field-emission scanning electronic microscope is 20 ppm or less, the coarse particles having a size more than 16 times the D50 (SEM). During the production of the titanium oxide particles, when a starting material gas and an oxidizing gas are introduced into a reaction tube so as to be reacted with each other, the inner wall of the reaction tube is provided with a blow-off opening for a purge medium and the blow-off angle of the purge medium and the blow-off rate (B) of the purge medium from the inner wall of the reaction tube are set so that the purge medium whirls along the inner wall of the reaction tube.

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Inventors:
FURUMOTO YOSHIYASU (JP)
KAYAMA SUSUMU (JP)
KOGOI HISAO (JP)
Application Number:
PCT/JP2022/019383
Publication Date:
November 24, 2022
Filing Date:
April 28, 2022
Export Citation:
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Assignee:
SHOWA DENKO KK (JP)
International Classes:
C01G23/07
Foreign References:
JPS5025919B11975-08-27
JP2003327432A2003-11-19
JP2006265094A2006-10-05
JPS4930916B11974-08-16
JPS518192A1976-01-22
JP2006265094A2006-10-05
JP2005209877A2005-08-04
Other References:
"Supermicroparticles Handbook", 1990, FUJI TECHNOSYSTEMS, pages: 93
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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