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:
Feb. 13, 2024
Filed:
Feb. 25, 2019
Nissan Chemical Corporation, Tokyo, JP;
NISSAN CHEMICAL CORPORATION, Tokyo, JP;
Abstract
A method for producing a silica sol containing a small amount of metal impurities and in which colloidal silica having an elongated particle shape dispersed in a solvent, includes: preparing a raw material liquid by adding a compound as an anion source selected from inorganic acids, organic acids, and their ammonium salts, and ammonia to a colloidal aqueous solution of activated silica having an SiOconcentration of 1 to 6% by mass and a pH of 2 to 5 so that the mass ratio of the compound to SiOis 3.0 to 7.0%; and heating the raw material liquid at 80 to 200° C. for 0.5 to 20 hours. The elongated colloidal silica particles exhibit a D/Dratio of 2.5 or more. Dis an average particle diameter as measured by the dynamic light scattering method. Dis a primary particle diameter as measured by the nitrogen gas adsorption method.