Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1997-10-17
1999-11-30
Lovering, Richard D.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
2523635, 427219, 427221, 42721336, 428405, 516100, 528 12, 528 32, 528 43, B32B 1800, B05D 700, C08G 7718
Patent
active
059939672
ABSTRACT:
A coated ceramic powder comprises a plurality of ceramic particles and a siloxane star-graft coating polymer encapsulating at least a portion of the particles. The coating polymer comprises Si(w,x,y,z), where w, x, y and z are the mole percent tetrafunctional, trifunctional, difunctional and monofunctional monomeric units, respectively, and wherein w, x, y and z are about 45-75, 5-25, 5-45 and 5-10, respectively. A method of preparing a coated ceramic powder comprises the steps of (a) polymerizing each of a tetrafunctional siloxane monomer, a trifunctional siloxane monomer, a difunctional siloxane monomer, and a monofunctional siloxane monomer, (b) adding a quantity of ceramic powder to a reaction vessel, (c) shear mixing the ceramic powder for a time sufficient to wet substantially all of the powder surface, (d) adding the siloxane polymer prepared in step (a) to the reaction vessel containing the shear mixed ceramic powder, (e) shear mixing the shear mixed ceramic powder and the siloxane polymer for a time sufficient to form a siloxane polymer coated ceramic powder, and (f) separating the coated ceramic powder from the components remaining in the reaction vessel. The process may be rendered continuous by employing continuous high-shear mixing equipment and appropriate process modifications.
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Aikens John H.
Brotzman, Jr. Richard W.
Lovering Richard D.
Nanophase Technologies Corporation
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