Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Reexamination Certificate
2011-08-09
2011-08-09
Ruthkosky, Mark (Department: 1785)
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
Reexamination Certificate
active
07993746
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.
REFERENCES:
patent: 6287353 (2001-09-01), Celikkaya
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patent: 2003-064315 (2003-03-01), None
patent: 2005-082441 (2005-03-01), None
patent: 10-2005-0025126 (2004-04-01), None
patent: 100619248 (2006-08-01), None
Chang Gil Wan
Choe Dong Uk
Jo Sung Yun
Kang Kwang Choong
Lee Jung Min
CQV Co., Ltd.
Frommer & Lawrence & Haug LLP
Harris Gary
Korea Research Institute of Chemical Technology
Ruthkosky Mark
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