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:
Oct. 21, 2025
Filed:
Apr. 16, 2020
Shin-etsu Chemical Co., Ltd., Tokyo, JP;
Mitsuhito Takahashi, Annaka, JP;
SHIN-ETSU CHEMICAL CO., LTD., Tokyo, JP;
Abstract
A method for producing rare earth carbonate fine particles, including, forming a reaction solution in which an alkyldimethylamine oxide compound having a structure represented by the following formula (1) or a methylmorpholine oxide compound is added to an aqueous solution containing rare earth ion and an excess amount of urea with respect to the rare earth ion, such that the compound is added in an addition amount of 10 to 200 mol % relative to the rare earth ion, and subjecting the reaction solution to hydrothermal treatment to produce rare earth carbonate fine particles. This provides a method for producing rare earth carbonate fine particles of submicron or less and having excellent dispersibility. wherein R represents an alkyl group of C1 to C14.