Process for the production of coated particles
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United States of America Patent
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Feb 27, 2001
Grant Date -
N/A
app pub date -
Jul 29, 1999
filing date -
Nov 21, 1994
priority date (Note) -
Expired
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Abstract
A process for the production of insulator-coated black particles, which comprises the steps of (1-a) dispersing particles of silica or a metal oxide in an alcohol-based solvent consisting mainly of an intermediate alcohol to obtain a dispersion of the above particles, (1-c) forming a titanium oxide coating of TiO.sub.2 on the surface of each of the particles whose surfaces have been activated in the above step, to obtain titanium oxide-coated particles, (1-d) calcining the titanium oxide-coated particles obtained in the above step in a reducing and/or nitriding atmosphere and thereby blackening the above titanium oxide coatings to obtain black particles, and (1-e) forming an electrical insulator coating on a surface of each of the black particles obtained in the above step, to obtain insulator-coated black particles; characerized in that the process includes a step of (1-b) adding an alkaline aqueous solution to the dispersion obtained instep (1-a) to activate a surface of each of the particles of a metal oxide.
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