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. 09, 2011
Filed:
Aug. 27, 2007
Jung Min Lee, Daejeon, KR;
Jeong Kwon Suh, Daejeon, KR;
Byung Ki Park, Daejeon, KR;
Dong Uk Choe, Daejeon, KR;
Gil Wan Chang, Cheongju-si, KR;
Kwang Su Lim, Cheongju-si, KR;
Sung Yun JO, Chungcheongbuk-do, KR;
Kwang Choong Kang, Cheongju-si, KR;
Jung Min Lee, Daejeon, KR;
Jeong Kwon Suh, Daejeon, KR;
Byung Ki Park, Daejeon, KR;
Dong Uk Choe, Daejeon, KR;
Gil Wan Chang, Cheongju-si, KR;
Kwang Su Lim, Cheongju-si, KR;
Sung Yun Jo, Chungcheongbuk-do, KR;
Kwang Choong Kang, Cheongju-si, KR;
Korea Research Institute of Chemical Technology, Daejeon, KR;
CQV Co., Ltd., Chungcheongbuk-do, KR;
Abstract
The present invention relates to flaky alpha-alumina crystals with large aspect ratio and its preparation method, and particularly to flaky alpha-alumina crystals comprising aluminum oxide, zinc oxide and tin oxide, which are prepared by obtaining a mixed gel which are prepared by obtaining a mixed gel by means of hydrolysis of an aqueous aluminum precursor solution comprising aqueous flux, aqueous zinc precursor solution and tin precursor aqueous solution, followed by aging, drying and crystallization processes. The crystals herein have an average particle thickness of 0.5 μm or less, an average particle diameter of 30 μm or higher and an aspect ratio of 100 or higher, thus being useful as a substrate of high quality pearlescent pigments, an abrasive, ceramic material and a filling material.