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:
Aug. 11, 2015
Filed:
Sep. 27, 2013
Gc Corporation, Bunkyo-ku, JP;
GC CORPORATION, Bunkyo-ku, JP;
Abstract
[Problems to be Solved] To provide fluoroaluminosilicate glass powder enabling to improve acid resistance of dental glass ionomor cement and a production method thereof. [Solution] A lanthanum compound eluted in the presence of polycarboxylic acid and water exists only in a surface layer of a fluoroaluminosilicate glass powder. An amount of the fluoroaluminosilicate glass powder is preferably 1 to 5% by weight in terms of oxide. The fluoroaluminosilicate glass powder is produced by mixing an aqueous solution of a lanthanum compound and a fluoroaluminosilicate glass powder not containing lanthanum, and heating them. The aqueous solution of lanthanum compound is an aqueous solution of a water solvable lanthanum compound, preferably an aqueous solution of lanthanum nitrite and/or an aqueous solution of lanthanum chloride.