Processes for producing coated particles
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United States of America Patent
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Dec 8, 1998
Grant Date -
N/A
app pub date -
Apr 11, 1995
filing date -
Aug 12, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
The process for producing coated particles of the present invention is applicable to a process of producing coated particles by charging powder of core particles into the coating space and permitting a coat forming substance generated via a vapor phase or being in a vapor-phase state to contact against particles of the powder, and the process is characterized by dispersing powder of core particles having an average particle diameter of not more than 10 .mu.m and a particle size distribution of ((D.sub.M /5, 5D.sub.M), .gtoreq.90%) to adjust a dispersity .beta. to at least 70%, and contacting the dispersed powder of the core particles with the coat forming substance. According to the present invention, individual particles can be covered with the coat forming substance even the particles are in powder of fine are particles or core particles consisting chiefly of fine particles, yielding no uncoated particles nor particles having uncoated portions caused by formation of coated agglomerates covered on the surface with the coat forming substance. In view of the fact that uncoated particles or particles having uncoated portion are not in existence, the merits on the industrial outputs are extremely large.
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