| 摘要 |
PROBLEM TO BE SOLVED: To prevent the interparticulate bridging of an insulated ultrafine powder prepared by covering a conductive ultrafine powder with an insulating film to stabilize the dielectric properties of a composite of a resin with the insulated ultrafine powder. SOLUTION: What is provided is an insulated ultrafine powder which is an insulated ultrafine powder prepared by subjecting an insulated ultrafine powder prepared by covering an electrically conductive ultrafine powder with an insulating film to surface treatment for hydrophobization, wherein the electrically conductive ultrafine powder comprises a carbon material in the form of a sphere of a particle diameter of 1-500 nm, a fiber of a cross-sectional-diameter of 1-500 nm, or a flake of a thickness of 1-500 nm, the insulating film comprises an insulating metal oxide or a hydrate thereof, and the insulating film has a thickness which is 0.3 nm or larger, is equal to or smaller than the particle diameter when the electrically conductive ultrafine powder is in the form of a sphere, is equal to or smaller than the cross-sectional diameter when it is a fiber, and is equal to or smaller than the thickness when it is a flake. A high-permittivity resin composite material is obtained by mixing the insulated ultrafine powder with a resin in a volume ratio of 5/95 to 50/50. COPYRIGHT: (C)2008,JPO&INPIT
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