The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 04, 2025
Filed:
Feb. 26, 2025
Admatechs Co., Ltd., Miyoshi, JP;
Yusuke Watanabe, Miyoshi, JP;
ADMATECHS CO., LTD., Miyoshi, JP;
Abstract
A method for producing spherical silica particles according to the present disclosure includes: a raw material silica particle preparation step of preparing a liquid dispersion of raw material silica particles from a raw material solution obtained by dissolving silicic acid in a mixed solvent of water and an organic solvent in the presence of a basic substance; and a heating step of heating the liquid dispersion or the raw material silica particles so as to remove an organic substance contained in the liquid dispersion, thereby preparing spherical silica particles. The mixed solvent has a relative permittivity of 21 or higher and 40 or lower, and a quaternary ammonium derived from the basic substance is blended in a blending ratio of 0.3 or higher and 0.8 or lower in terms of molar ratio with respect to a silicon element derived from the silicic acid.